ballistic-resistant article, and method for forming a ballistic-resistant article

专利摘要:
BALLISTIC-RESISTANT ARTICLE, AND METHOD FOR FORMING A BALLISTIC-RESISTANT ARTICLE. Ballistic-resistant composite articles having improved resistance to deformation of the posterior face. The composite articles incorporate one or more vacuum panels that mitigate or eliminate the shock wave energy resulting from a projectile impact, to minimize the transient compression of the materials behind the reinforcement.
公开号:BR112015023200B1
申请号:R112015023200-0
申请日:2014-03-09
公开日:2021-03-16
发明作者:Henry Gerard Ardiff；Lori L. Wagner
申请人:Honeywell International Inc；
IPC主号:

专利说明:

TECHNICAL FIELD
[0001] This technology refers to ballistic-resistant composite articles that have improved resistance to deformation of the posterior face. DESCRIPTION OF RELATED TECHNIQUE
[0002] The two main measures of performance of anti-ballistic armor are resistance to penetration by the projectile and resistance to blunt trauma ("trauma"). A common characterization of resistance to projectile penetration is velocity V50, which is the experimentally derived impact speed, calculated statistically, in which a projectile is expected to fully penetrate the armature 50% of the time and be stopped by the armature 50% of the time . For composites of equal surface density (that is, the weight of the composite panel divided by the surface area), the higher the V50, the greater the resistance to penetration presented by the composite. Whether a high-speed projectile penetrates an armor or not, when the projectile engages the armor, the impact also flexes the body armor in the area of impact, potentially causing significant trauma to closed non-penetrating contusions. The measurement of the depth of the deflection of the armature due to a bullet impact is known as the posterior face signature ("BFS"), also known in the art as posterior face deformation or trauma signature. Injuries potentially resulting from closed trauma can be just as deadly to an individual as if a bullet had fully penetrated the armor and penetrated the body. This is especially true in the context of helmet armor, where the transient protrusion caused by a bullet that has been stopped can still cross the cranial plane underlying the helmet and cause debilitating or fatal brain damage. Therefore, there is a need in the art for a method to produce ballistic-resistant composites with both superior ballistic performance of the V50 type, as well as with low back face signature.
[0003] It is known that the impact of a high-speed projectile with ballistic-resistant armor generates and propagates a compression wave. This compression wave, that is, a shock wave, propagates externally from the point of impact, causing a transient compression behind the reinforcement. This transient compression often extends beyond the actual deformation of the reinforcement and can be a significant contribution to the depth resulting from the deformation of the posterior face, causing major blunt blunt trauma. Limiting or attenuating the energy of the shock waves, or even totally preventing the formation of the shock wave could be effective in reducing the extent of deformation of the posterior face.
[0004] A method to limit the effect of a shock wave that is by absorption. For example, U.S. Patent Application Publication 2012/0234164 teaches a system that includes a fracture layer comprising an outer ceramic layer, a material that disintegrates by fracturing in the form of fine particles when it absorbs a shock wave, and a plurality of built-in resonators contained in the fracture material. The ceramic layer accelerates and spreads a shock wave generated by the impact of a projectile, the fracture material absorbs the shock wave that induces it to pump high-energy acoustic wave energy, and the resonators reflect the energy generated in the fracture layer . This system employs an approach that is counterintuitive as to the approach described here, amplifying the shock wave instead of mitigating, such that the wave has enough energy to activate vibrations in the particular wavelengths of the acoustic spectral line.
[0005] U.S. Patent Application Publication No. 2009/0136702 teaches a transparent shielding system to modify the shock wave propagation pattern and subsequent damage patterns of the transparent armor such as bulletproof glass. They describe the incorporation of a non-flat inner layer positioned between two layers of the reinforcement. The design of the non-flat interface of the inner layer changes the pattern of the shock waves through geometric scattering and mismatch of the sound impedance of the material induced by the scattering. This type of structure is designed to allow the distribution of impact energy in preferred areas of the armature without causing significant fragmentation and shattering of the glass. This system is not aimed at body armor.
[0006] Other systems are known to employ mitigation materials such as aerospace grade honeycomb materials, or blast foam to suppress shock waves and reduce the impact of high pressure blast energy. Aerospace grade honeycomb materials are generally characterized as a panel of highly compacted geometric cells. It is a structural material that is commonly used in composites that form structural components in aircraft and vehicles due to its high strength, structural properties and superior versatility, but they are also known for use in ballistic-resistant composites. See, for example, United States patent US 7,601,654 teaches that rigid ballistic-resistant structures comprising a hive-type central panel positioned between two ballistic-resistant fibrous panels. Blast attenuating foams are useful because they absorb thermal energy from an explosion and can collapse and absorb energy due to their viscoelastic properties. Condensable gases in the foams can condense under high pressure, thereby releasing the condensation heat into the aqueous phase and inducing a reduction in the speed of the shock wave. See, for example, US patent 6,341,708, which teaches explosion-resistant assemblies and container assemblies that direct explosions to receive explosive items and prevent or minimize damage in the event of an explosion. Container assemblies are made from one or more bands of an explosion-resistant material, and are optionally filled with an explosion-attenuating foam.
[0007] These articles of related art are limited in their usefulness. They are not optimized to limit or eliminate the energy of the shock wave, maintaining a superior resistance to the ballistic penetration of high speed projectiles and at the same time maintaining a low weight that is sufficient for body armor applications. The articles described in both US Patent Nos. 2009/0136702 and US 2012/0234164 are composites of heavy non-fibrous materials, which are predominantly used for bulletproof glass applications. Articles containing honeycomb structures are bulky, heavy and not optimized for use in body armor. Articles that incorporate explosive foam to mitigate explosions also have limited effectiveness in body armor applications.
[0008] In view of these disadvantages, there is a continuing need in the art to improve shielding solutions that are useful in a wide range of applications, including, but not limited to, body armor applications. The present system provides a solution to this need in the art. SUMMARY OF THE INVENTION
[0009] An improved system is provided that uses vacuum panel technology in combination with high-performance ballistic-resistant composites to form lightweight articles, with all the desired advantages described here.
[0010] A ballistic resistance article is provided comprising: a) a vacuum panel with a first and a second surface, said vacuum panel comprising an enclosure and an internal volume defined by the enclosure, wherein at least a part of said internal volume is empty space, and in which said internal volume is under vacuum pressure; and b) at least one ballistic-resistant substrate directly or indirectly coupled with at least one of said first and second surface of said vacuum panel, said substrate comprising fibers and / or bands having a toughness of about 7 g / denier or more and a pull module of about 150 g / denier or more.
[0011] A ballistic-resistant article is also provided comprising: a) a vacuum panel with a first and a second surface, said vacuum panel comprising an enclosure and an internal volume defined by the enclosure, wherein at least part of the said internal volume is an unoccupied space and in which said internal volume is under vacuum pressure; and b) at least one ballistic-resistant substrate directly or indirectly coupled with at least one of said first and second surface of said vacuum panel, comprising a rigid non-tape based and non-fibrous base material.
[0012] In addition, a method of forming a ballistic-resistant article is provided, comprising: a) providing a vacuum panel with a first and a second surface, said vacuum panel comprising an enclosure and an internal volume defined by casing, in which at least a part of said internal volume is unoccupied space and in which said internal volume is under vacuum pressure; and b) coupling at least one ballistic-resistant substrate with at least one of said first and second surface of said vacuum panel, said substrate comprising fibers and / or bands having a toughness of about 7 g / denier or more and a module of elasticity of about 150 g / denier or more, or wherein said substrate comprises a rigid non-tape based material and a non-fibrous base; wherein said at least one ballistic-resistant substrate is positioned as the impact face of the ballistic-resistant article and said vacuum panel is positioned behind said at least one ballistic-resistant substrate to receive a shock wave that initiates from a projectile impact with said at least one ballistic-resistant substrate. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 is a schematic perspective view that illustrates the representation of a shock wave effect on the signature of the posterior face in a clay-based support material for an existing technique reinforcement structure, which does not incorporate a vacuum panel.
[0014] Figure 2 is a schematic representation in perspective that illustrates a reduction in the signature of the posterior face in a clay-based support material due to the suppression of the shock wave resulting from the incorporation of a vacuum panel in an armature structure.
[0015] Figure 3 is a schematic representation of a perspective view of a vacuum panel of existing art.
[0016] Figure 4 is a schematic representation of a perspective view of an existing art vacuum panel.
[0017] Figure 5 is a schematic representation of a perspective view of a laminar structure of a vacuum panel where a plurality of vacuum compartments are mutually interconnected, in order to form a sheet with perforations between the adjacent panels.
[0018] Figure 6 is a schematic representation of a perspective view of a composite reinforcement structure that incorporates multiple alternating ballistic-resistant substrates and multiple vacuum panels.
[0019] Figure 7 is a schematic representation of a cross-sectional view of the ballistic-resistant article of the invention, in which a ballistic-resistant substrate and a vacuum panel are indirectly coupled by, and kept apart, by connecting anchors.
[0020] Figure 8 is a schematic representation of a cross-sectional view of ballistic-resistant article of the invention, in which a ballistic-resistant substrate and a vacuum panel are indirectly coupled by, and held apart by connecting anchors, by means of a frame.
[0021] Figure 9 is a graphical representation of the signature data on the back of the examples as summarized in Table 2. DETAILED DESCRIPTION
[0022] It is known that a shock wave cannot travel through a vacuum. The invention employs vacuum panel technology in conjunction with ballistic-resistant armor to mitigate the effect of shock waves generated by the impact of a projectile. The articles are particularly effective in reducing the extent of deformation of the posterior face and avoiding or minimizing blunt trauma injuries.
[0023] Figures 1 and 2 serve to illustrate the importance of reducing the deformation of the posterior face when the construction of the invention is employed. Figure 1 illustrates how the impact of a bullet 250 on the impact face 220 of a ballistic-resistant substrate 210 causes a transient post-impact deformation 240 and a post-impact shock wave 260. The figure schematically illustrates the effect of the wave post-impact shock absorber 260 on the signature of the posterior face 280 in a support material based on clay 270 for a reinforcement structure of the already existing technique, which incorporates a conventional support material 230 (such as the honeycomb material or a foam) instead of a vacuum panel of the invention. This is contrasted with Figure 2, which illustrates an armature construction of the invention. The figure illustrates, schematically, how the placement of a support material of the type vacuum panel 212 at the rear of the ballistic-resistant substrate 210 eliminates the shock wave and the resulting decrease in the signature of the posterior face 280.
[0024] The vacuum panel technology is known from other sectors not related to the production of reinforcement, mainly as insulation materials and soundproof materials in buildings and residential constructions. Generally, any known vacuum panel construction having an internal volume that is under a vacuum pressure is useful here, as long as at least part of its internal volume is unoccupied. Preferred vacuum panels are those that have internal volumes that are predominantly unoccupied spaces, and most preferably the vacuum panels have internal volumes that are substantially empty spaces. As used herein, "empty space" describes the presence of materials or physical support structures inserted in the internal volume of the vacuum panel. It does not refer to the quality of the vacuum or the amount of gas present within the internal volume of the vacuum panel. As used herein, "predominantly empty space" means that more than 50% of the internal volume of a vacuum chamber within a vacuum panel is an unoccupied space, where any remaining part of the internal volume is occupied by the support structures or filling materials. As used here, "substantially unoccupied space" means that at least 80% of the internal volume of a vacuum chamber within a vacuum panel is unoccupied space, where any remaining part of the internal volume is occupied by support structures or by filling materials, and more preferably, in which at least about 90% of the internal volume is an unoccupied space. More preferably, 100% of the internal volume of a vacuum chamber within a vacuum panel is an unoccupied space. A vacuum panel, with 100% of the internal volume of its vacuum chamber being an unoccupied space, may necessarily have walls made from a rigid material that is able to preserve its shape while under vacuum. In applications such as body armor where flexibility and low weight are desired, it is preferred that the walls of the vacuum panel are made from a flexible, non-rigid, lightweight material, which may necessarily have a support structure contained in the internal volume to prevent the panel walls from collapsing under vacuum. In this embodiment, it is preferred that this internal support structure comprises only a minimal amount of the internal volume, preferably comprising no more than about 20% of the volume so that at least about 80% of the vacuum panel is left with a space not busy.
[0025] The empty space within each vacuum panel is, at least partially evacuated from gas molecules, to form a vacuum. Ideally, the unoccupied space is completely evacuated from gas molecules in order to achieve an absolute pressure equal to zero torr, where the unoccupied space contained in the internal volume consists entirely of hollow, empty space. However, the complete evacuation of the gas molecules, known as the perfect vacuum, is not necessary to meet the definition of a vacuum. A vacuum is defined as an absolute pressure less than 760 torr. Therefore, as used herein, the internal volume of a vacuum panel is under vacuum pressure when the absolute pressure of the internal volume is less than 760 torr. For maximum attenuation of the shock wave energy, it is preferable that the internal volumes of the vacuum panels are evacuated at the lowest possible pressure. In preferred embodiments, at least 90% of the gases are evacuated from the vacuum panels, resulting in an internal pressure of about 76 torr or less. More preferably, at least 95% of the gases are evacuated from the vacuum panels, resulting in an internal pressure of about 38 torr or less. Even more preferably, at least 99% of the gases are evacuated from the vacuum panels, resulting in an internal pressure of about 8 torr or less. In the most preferred embodiments, the vacuum panels have an internal pressure of about 5 torr or less, more preferably about 4 torr or less, more preferably about 3 torr or less, more preferably about 2 torr or less, and further more preferably about 1 torr or less. All pressure measurements identified here refer to absolute pressure. If the articles of the invention include multiple vacuum panels, the internal pressure of all panels can be the same or the pressures can vary.
[0026] Useful vacuum panels are preferably generally square or rectangular in shape, but other shapes can also be employed and the shape of the vacuum panel is not intended to be limiting. Useful vacuum panels are commercially available. The vacuum panel preferably comprises a first surface (or first wall), a second surface (or second wall) and optionally one or more side walls which together form a housing, with an internal volume defined by the housing. A vacuum is created inside the panel by evacuating any gases present in the internal volume, typically through an opening located on one of the first or second surfaces or one of the optional side walls. A vacuum panel representative of the existing technique that is useful here is illustrated in Figure 3 and is described in more detail in U.S. Patent No. 8,137,784 assigned to Levei Holding BV in the Netherlands, the disclosure of which is incorporated herein by reference insofar as it is consistent with the above. US Patent No. 8,137,784 describes a vacuum insulation panel, formed by an upper main wall 1 and a lower main wall 2 (not shown in Figure 3), in which both main walls are mutually connected by a metallic sheet 3 that extends around it. The metal sheet 3 is welded to a curved skirt 5 of the upper main wall 1 and to a curved skirt 6 of the lower main wall 2. Strips 7 and 8 improve the quality of the weld between the curved skirts 5 and 6, respectively, with the sheet metal 3. The gases inside the panel are removed through an opening in the upper part arranged on the main wall 1 and the opening is closed with a cover plate 9, which is welded over the upper main wall 1. The US Patent US No. 8,137,784 describes that its panel walls are made from a thin, low-conductivity metal, such as stainless steel, titanium or a suitable alloy. However, for the purposes of the present invention, the materials used to manufacture the vacuum panel are not so limited and can be any type known in the art of vacuum insulation panels.
[0027] Another vacuum panel representative of the existing technique that is useful here is illustrated in Figure 4 and is described in detail in US Patent No. US 5,756,179 assigned to Owens-Corning Fiberglass Technology Inc. of Summit, IL, the disclosure of which is hereby incorporated by reference to the extent consistent with the foregoing. U.S. Patent No. 5,756,179 describes a vacuum panel 102 comprising a jacket 104 including a top 104a and a bottom 104b. jacket 104 is formed of a metal such as 3 mil thick stainless steel. The bottom 104b is configured as a tray having side edges 120, a cavity for receiving an insulating medium, and a flat flange 106 that extends around its periphery. The flat flange 106 is welded to the top 104a to form an airtight seal, and the formed confinement is thus evacuated to create a vacuum within the confined space. Preformed edge inserts 128 shown in Figure 4 are present to engage the adjacent vacuum insulation panels in a multi-panel construction.
[0028] US patent 4,579,756 describes a laminar structure of the existing vacuum panel made of a plurality of air-tight chambers whose chambers have a partial vacuum inside. The insulating laminar structure of U.S. Patent 4,579,756 is illustrated in Figure 5, in which a plurality of vacuum compartments 10 are mutually interconnected to form a sheet. The sheet is marked to create perforations 14 between adjacent panels. The sheet can be torn and separated in the respective perforations, allowing the size of the sheet to be customized by the user. Any type of compartmentalized vacuum panel structure having a plurality of discrete vacuum panels in side-by-side configuration or in an edge-to-edge configuration is preferred to help the vacuum panel survive multiple projectile impacts .
[0029] A number of other vacuum panel structures are known in the art and can also be used in the present invention. See, for example, US patents 4,718,958; 4,888,073; 5,792,539; 5,271,980; 7,562,507 and 7,968,159, as well as the publication of US Patent Application No. 2012/0058292, all of which are incorporated herein by reference, to the extent that it is compatible with the foregoing.
[0030] The dimensions of the vacuum panels and the materials used to manufacture the panels may vary depending on the intended end use for the ballistic-resistant composite reinforcement. For example, articles for use in body armor should be lightweight, such that vacuum panels made from lightweight materials are desired. When the intended use is not for armor, such as armor used to reinforce vehicles or building walls, low weight is not as important and heavier materials may be desired. In each application, useful manufacturing materials are well known and an ideal panel construction can be easily determined by one usually skilled in the art.
[0031] In a preferred embodiment, where the intended end use for the ballistic-resistant article is an armature application, the vacuum panel (or panels) preferably comprises a flexible, sealed polymeric envelope. A suitable polymeric envelope is preferably formed from overlapping and sealed polymeric sheets, and may also comprise a multilayer or single film structure. The polymers suitable for said polymeric sheets may vary and may comprise, for example, polyolefins or polyamides, such as those described in U.S. Patent 4,579,756, U.S. Patent 5,943,876 or in the publication of the application for US patent No. 2012/0148785, which is incorporated herein by reference to the extent that they are consistent with the foregoing. As described in US patent 5,943,876, it is preferred that such a polymeric envelope structure comprises at least one layer of a barrier film that minimizes gas permeation in order to maintain a vacuum. A representative multilayer film comprises one or more layers of heat-sealed polymers, one or more layers of polyethylene terephthalate (PET), one or more layers of polyvinylidene chloride and one or more layers of polyvinyl alcohol. Other polymeric envelopes can be metallized with aluminum oxide or laminated with a foil to provide gas barrier properties. These options are exemplary only and are not exclusive, and such constructions are well known in the art of vacuum panels. Incidentally, the incorporation of a metallic laminar layer together with at least one of the first and second surfaces of the vacuum panel can also have the secondary benefit of partially reflecting part of the shock wave energy. Such a laminar layer may comprise any useful metal foil known, such as an aluminum foil, copper foil or nickel foil, as determined by one of ordinary skill in the art.
[0032] US Patent Application Publication No. 2012/0148785 teaches vacuum panels comprising a polymeric shell comprising a heat sealing layer, including very low density polyethylene (VLDPE), low density polyethylene (LDPE ), linear low density polyethylene (LLDPE), high density polyethylene (HDPE), metallocene polyethylene (mPE), linear low density metallocene polyethylene (mLLDPE), ethylene vinyl acetate (EVA), ethylene propylene copolymer (EP) ) or ethylene-propylene-butene terpolymer (EPB), and a gas barrier layer formed over the heat seal layer, wherein the gas barrier layer includes a plurality of composite layers, each including a polymeric substrate and a single layer or multiple layers of metal or oxide thereof, which is formed on one side or on both sides of the polymeric substrate, and the polymeric substrate includes uniaxially stretched polyethylene terephthalate (PET) biaxially drawn or stretched, polybutylene terephthalate (PBT), polyimide (PI), ethylene / vinyl alcohol copolymer (EVOH) or a combination thereof.
[0033] The thickness of the sheet and the total dimensions of the panel may also vary; as can be determined by the one usually versed in the technique, as to the intended end use. Vacuum panels that have a deep internal volume are expected to be more effective in attenuating shock waves compared to a vacuum panel with a shallow internal volume. However, it was unexpectedly found that vacuum panels, with a depth of as little as 0.635 cm (1 inch), are effective in reducing shock wave energy due to a projectile impact, depending on factors such as energy of the projectile, and / or the mass of the projectile and / or the velocity of the projectile, as well as the compression fraction of the vacuum panel. Vacuum panels that have a high compaction fraction are desirable because a projectile impact will press the impact face of the armature against the vacuum panel, inducing the front surface of the vacuum panel directly adjacent to the substrate to press into the internal space of the panel and towards the rear surface of the panel. Vacuum panels that have a high fraction of compaction will resist this displacement and prevent the front panel surface from impacting the rear surface, which can generate another shock wave. Therefore, the preferred depths of the vacuum panel will vary.
[0034] It can also be expected that in some cases, the impact of a projectile can damage or destroy the vacuum panel, thus reducing the effectiveness of the armature article against multiple projectile impacts. Therefore, it is more preferred that the composite articles of the invention include a plurality of vacuum panels. In a preferred embodiment, an article includes a plurality of panels positioned in close proximity to one another in a side-by-side or edge-to-edge configuration, such as a sheet of vacuum panels of the existing technique as illustrated in Figure 5. This prior art structure includes perforations between the panels to allow easy customization of the length and width of the sheet, preferred embodiment as illustrated in Figure 6, includes a plurality of vacuum panels 212 stacked together in a front-to-back sequence, preferably alternating with a plurality of ballistic-resistant substrates 210. The articles of the present modality provide cascade protection, preserving protection against shock waves across the entire length and width of an armature article, even if one of the vacuum panels is destroyed by a projectile impact.
[0035] As illustrated in Figures 2 and 6-8, the ballistic-resistant articles of the invention include at least one ballistic-resistant substrate coupled with at least one of the first and second surfaces of each vacuum panel. The at least one ballistic-resistant substrate can be directly or indirectly coupled with at least one of the first and second surfaces of each vacuum panel. Direct coupling refers to the direct connection of a ballistic-resistant substrate surface to a vacuum panel surface, such as with an adhesive, such that there is no space between the substrate and the panel. Indirect coupling refers to a modality in which a ballistic-resistant substrate and a vacuum panel are mutually joined on one or more of its surfaces with a connector instrument so that the surfaces do not touch each other directly. Indirect coupling also includes modalities in which a vacuum panel is simply incorporated into an armature article without the vacuum panel and the ballistic-resistant substrate mutually touching or even being mutually attached or connected by any means. In this regard, the invention encompasses any reinforcement design that includes a vacuum panel.
[0036] For the purposes of the present invention, a ballistic-resistant substrate is a material that has excellent properties against the penetration of deformable projectiles, such as bullets, and against the penetration of fragments, such as shrapnel and fragments. A "fibrous layer", as used herein, may comprise a single layer of unidirectionally oriented fibers, a plurality of interconnected but unconsolidated layers, of unidirectionally oriented fibers, a weave fabric, a plurality of consolidated weave fabrics, or any other textile structure that has been formed from a plurality of fibers, including felts, blankets and other structures, such as those comprising randomly oriented fibers. A "layer" describes a generally planar arrangement. A fibrous layer will have both a top / front surface and a bottom / rear surface. A "single layer" of unidirectionally oriented fibers comprises a substantially non-overlapping fibrous arrangement, wherein the fibers are aligned in a substantially parallel unidirectional arrangement. This type of fibrous arrangement is also known in the art as a "unitape", "unidirectional tape", "UD" or "UDT". As used herein, an "arrangement" describes an orderly arrangement of fibers or yarns, which is exclusively made up of woven fabrics, and a "parallel arrangement" describes an orderly parallel arrangement of fibers or yarns. The term "oriented", as used in the context of "oriented fibers" refers to the alignment of the fibers. The term "fabric" describes structures that can include one or more layers of fiber, with or without molding or consolidating the layers. For example, a woven or felt fabric may comprise a single layer of fibers. A nonwoven fabric formed from unidirectional fibers typically comprises a plurality of layers of fibers stacked on top of each other and consolidated. When used herein, a "single layer" structure refers to any monolithic fibrous structure consisting of one or more individual sheets or individual layers that have been interleaved; that is, consolidated by low pressure lamination, or by high pressure molding, in the form of an individual unitary structure, optionally together with a polymeric binder material. By "consolidation" is meant that a polymeric binder material together with each fibrous layer is combined as an individual unitary layer. Consolidation can occur through drying, cooling, heating, pressure or a combination of these. Heat and / or pressure may not be necessary, as the fibers or layers of fabric can simply be glued together, as is the case in a wet lamination process. The term "composite" refers to combinations of fibers or tapes, typically with at least one polymeric binder material. A "complex composite" refers to a consolidated combination of a plurality of fibrous layers. As described herein, "non-woven" fabrics include all textile structures that are not formed by weaving. For example, non-woven fabrics may comprise a plurality of unitapes that are at least partially coated with a polymeric binder material, stacked / overlapped and consolidated in the form of a single layer monolithic element, as well as a felt or blanket comprising non-parallel fibers at random oriented, which are preferably coated with a polymeric binder composition.
[0037] The ballistic-resistant substrate preferably comprises one or more layers, each layer comprising a plurality of polymeric fibers of high strength and high modulus of elasticity and / or non-fibrous polymeric tapes of high strength and of high modulus of elasticity. As used here, a "high strength and high modulus" fiber or tape is one that has a preferred toughness of at least about 7 g / denier or more, a preferred modulus of elasticity of at least about 150 g / denier denier or more, and preferably a burst energy of at least about 8 J / g or more, each, as measured by ASTM D2256 for fibers and ASTM D882 (or other appropriate method, as determined by a person skilled in the art ) for polymeric tapes. As used herein, the term "denier" refers to the unit of linear density, equal to the mass in grams per 9000 meters of fiber / yarn or ribbon. As used herein, the term "toughness" refers to the tensile stress, expressed as the force (grams) per unit of linear density (denier) of an unstressed sample. The "initial module" of a fiber or ribbon is the property of a material representative of its resistance to deformation. The term "modulus of elasticity" refers to the relationship between the change in toughness, expressed in grams-force per denier (g / d) relative to the change in tension, expressed as a fraction of the original length of the fiber or tape (inch /inch).
[0038] In modalities where the ballistic-resistant substrate is a fibrous material, of fibrous base, fibers of high resistance and high tensile modulus particularly suitable include polyolefin fibers that include high density and low density polyethylene. Particularly preferred are extended chain polyolefin fibers, such as highly oriented high molecular weight polyethylene fibers, and polypropylene fibers, particularly highly oriented high molecular weight polypropylene fibers. Also suitable are aramid fibers, in particular para-aramid fibers, polyamide fibers, polyethylene terephthalate fibers, polyethylene naphthalate fibers, extended chain polyvinyl alcohol fibers, extended chain polyacrylonitrile fibers, polybenzoxazole (PBO) fibers , polybenzothiazole (PBT) fibers, liquid crystal copolyester fibers, rigid rod fibers, such as M5® fibers, and glass fibers, including electric grade glass fiber (E-glass; low alkali borosilicate glass with good electrical properties), structural grade fiberglass (S-glass; a high strength aluminum-magnesium silicate) and strength grade glass fiber (R-glass; a high strength aluminum silicate glass without oxide magnesium or calcium oxide). Each of these types of fibers is conventionally known in the art. Also suitable for the production of polymeric fibers are copolymers, block polymers and mixtures of the materials mentioned above.
[0039] The most preferred types of fibers include polyethylene, particularly extended chain polyethylene fibers, aramid fibers, PBO fibers, liquid crystal copolyester fibers, polypropylene fibers, particularly highly oriented extended chain polypropylene fibers, alcohol fibers polyvinyl, polyacrylonitrile fibers and rigid rod fibers, particularly M5® fibers. Specifically most preferred fibers for use in the manufacture of ballistic-resistant substrate are aramid fibers, polyethylene fibers, polypropylene fibers and glass fibers.
[0040] In the case of polyethylene, preferred fibers are extended-chain polyethylene fibers having molecular weights of at least 300,000, preferably at least one million and more preferably between two million and five million. Such extended chain polyethylene fibers (ECPE) can be grown in solution spinning processes as described in US Patent Nos. 4,137,394 or 4,356,138, which are incorporated herein by reference, or can be spun from a solution to form a gel structure, as described in United States Patent Nos. 4,413,110; 4,536,536; 551,296; 4,663,101; 4,663,101; 5,006,390; 5,032,338; 5,578,374; 5,736,244; 5,741,451; 5,958.5 82; 5,972,498; 6,448,359; 6,746,975; 6,969,553; 7,078,099; 7,344,668, and US Patent Application Publication No. 2007/0231572 publication, all of which are incorporated herein by reference. Particularly preferred types of fibers for use in the ballistic-resistant substrate of the invention are any of the polyethylene fibers marketed under the SPECTRA® trademark from Honeywell International Inc. SPECTRA® fibers are well known in the art. Other types of useful polyethylene fibers also include DYNEEMA®, commercially available UHMWPE yarns from Royal DSM NV Corporation of Heerlen, The Netherlands.
Preferred are aramid (aromatic polyamide) or para-aramid fibers which are commercially available and are described, for example, in U.S. Patent No. 3,671,542. For example, poly (p-phenylene terephthalamide) filaments are produced commercially by DuPont under the trademark KEVLAR®. Also useful in the practice of the present invention are poly (m-phenylene-isophthalamide) fibers, commercially produced by DuPont of Wilmington, DE under the trademark NOMEX® and fibers produced commercially by Teijin Aramid Gmbh of Germany, under the trademark Twaron ®; aramid fibers commercially produced by Kolon Industries, Inc. of Korea under the brand name HERACRON®; SVM ™ and RUSAR ™ p-aramid fibers that are commercially produced by Kamensk Volokno JSC from Russia and ARMOS ™ p-aramid fibers commercially produced by JSC Chim Volokno from Russia.
[0042] PBO fibers suitable for the practice of this invention are commercially available and are disclosed, for example, in US patents US 5,286,833, 5,296,185, 5,356,584, 5,534,205 and 6,040,050, each of which is incorporated herein by reference. Liquid crystal copolyester fibers suitable for the practice of this invention are commercially available and are disclosed, for example, in U.S. patents US 3,975,487; 4,118,372 and 4,161,470, each of which is incorporated herein by reference, and including commercially available VECTRAN® liquid crystal copolyester fibers from Kuraray Co., Ltd. of Tokyo, Japan. Suitable polypropylene fibers include chain polypropylene fibers highly oriented (ECPP) as described in U.S. Patent 4,413,110, which is incorporated herein by reference. Suitable polyvinyl alcohol (PV-OH) fibers are described, for example, in U.S. patents US 4,440,711 and 4,599,267, which are incorporated herein by reference. Suitable polyacrylonitrile (PAN) fibers are disclosed, for example, in US patent US 4,535,027, which is incorporated herein by reference. Each of these types of fibers is conventionally known and is widely available commercially.
[0043] M5® fibers are fibers formed from pyridobisimidazole-2,6-diyl (2,5-dihydroxy-p-phenylene) and, more recently, were manufactured by Magellan Systems International of Richmond, Virginia, and are described, for example, in US Patent Nos. 5,674,969, 5,939,553, 5,945,537, and 6,040,478, each of which is incorporated herein by reference.
[0044] Ballistic-resistant glass fiber substrates preferably comprise glass fiber composites, preferably S-glass fibers, which are impregnated with a thermosetting resin or thermoplastic polymeric resin, such as a thermoset epoxy or phenolic resin . Such materials are well known in the art and are commercially available. Preferred examples not exclusively include substrates comprising S2-Glass® commercially available from AGY Aiken, South Carolina; ballistic-resistant linings formed from HIPERTEX ™ E-glass fibers, commercially available from 3B Fiberglass of Battice, Belgium. Also suitable are fiberglass materials comprising R-glass fibers, such as those commercially available under the trademark VETROTEX® from Saint-Gobain de Courbevoie, France. Combinations of all of the above materials are also suitable, all of which are commercially available.
[0045] As used herein, the term "ribbon" refers to a flat, narrow monolithic strip of material having a length greater than its width and an average aspect ratio of cross section; that is, the ratio of the largest dimension to the smallest cross-sectional dimension weighted over the length of the tape article, of at least about 3: 1. A tape can be of a fibrous material or a non-fibrous material. A "fibrous material" comprises one or more filaments.
[0046] In embodiments where the ballistic-resistant substrate comprises ribbons of fibrous materials, a ribbon may comprise a ribbon of woven fabric, or may comprise a plurality of fibers or yarns arranged in a generally unidirectional arrangement of generally parallel fibers. Methods for making tapes of fibrous materials are described, for example, in US Patent No. 8,236,119 and US Patent Applications Serial No. 13 / 021,262; 13 / 494,641; 13 / 568,097; 13 / 647,926 and 13 / 708,360, the disclosures of which are hereby incorporated by reference. Other methods for making tapes of fibrous materials are described, for example, in U.S. Patent Nos. 2,035,138; 4,124,420; 5,115,839, or by using a specialized ribbon loom to weave fabrics or narrow weave ribbons. Useful ribbon looms are disclosed, for example, in US Patent Nos. 4,541,461; 5,564,477; 5,564,477; 7,451,787 and 7,857,012, each of which is assigned to Textilma AG of Stansstad AG, Switzerland, and each of which is incorporated herein by reference to the extent consistent with the foregoing, although any alternative tape loom is equally useful. Polymeric tapes can also be formed by other conventionally known methods, such as extrusion, puJtrusion, slit film production techniques, etc. For example, a unitape of standard thickness can be cut or divided into strips having desired lengths. An example of a cutting apparatus is disclosed in U.S. Patent No. 6,098,510 which teaches an apparatus for cutting a sheet of a weft material as it is wound over said roll. Another example of a cutting equipment is disclosed in U.S. Patent 6,148,871, which teaches an apparatus for cutting a sheet of a polymeric film in the form of a plurality of film strips with a plurality of blades. The disclosures of both US patents US 6,098,510 and US patent 6,148,871 are hereby incorporated by reference to the extent that they are consistent with the foregoing. Methods for making non-fibrous polymeric tapes in the form of nonwoven are described, for example, in U.S. Patent Nos. 7,300,691; 7,964,266; and 7,964,267, which are incorporated herein by reference. For each of these tape modalities, multiple layers of tape-based materials can be stacked and consolidated / shaped in a similar way as fibrous materials, with or without a polymeric binder material.
[0047] In modalities in which the ballistic-resistant substrate is a suitable non-fibrous tape-based material, particularly polymeric materials of the type of high modulus of elasticity and high resistance, are polyolefin tapes. Preferred polyolefin tapes include polyethylene tapes, such as those commercially available under the trademark TENSYLON®, which is commercially available from EI du Pont de Nemours and Company of Wilmington, DE. See, for example, US Patents US Nos. 7,964,266 and 7,964,267, which are incorporated herein by reference. Also suitable are polypropylene tapes, such as those commercially available under the trademark of TEGRIS® Milliken & Company of Spartanburg, South Carolina. See, for example, U.S. Patent No. 7,300,691, which is here incorporated by reference. Polyolefin tape-based composites that are useful here as ballistic-resistant substrates are also commercially available, for example under the trademark DYNEEMA ® BT10 of the Royal DSM NV Corporation of Heerlen, The Netherlands and under the trademark of ENDUMAX® Teijin Aramid Gmbh from Germany.
[0048] Such tapes preferably have a substantially rectangular cross section with a thickness of about 0.5 mm or less, more preferably about 0.25 mm or less, even more preferably about 0.1 mm or less and still more preferably about 0.05 mm or less. In the most preferred embodiments, the polymeric tapes have a thickness of up to about 76.2 μm (3 mils), more preferably from about 8.89 μm (0.35 mil) to about 76.2 μm (3 mils) , and more preferably from about 8.89 μm (0.35 mil) to about 38.1 μm (1.5 mil). The thickness is measured in the thickest region of the cross section.
[0049] Polymeric tapes useful in the present invention have preferred widths from about 2.5 mm to about 50 mm, more preferably from about 5 mm to about 25.4 mm, even more preferably from about 5 mm to about 20 mm, and more preferably about 5 mm to about 10 mm. These dimensions may vary, but the polymeric strips formed here are more preferably manufactured to have dimensions that allow to achieve an average aspect ratio in the cross section; that is, the weighted dimension of the cross sections along the length of the tape article, greater than about 3: 1, more preferably at least about 5: 1, even more preferably at least about 10: 1, even more preferably at least less about 20: 1, even more preferably at least about 50: 1, even more preferably at least about 100: 1, even more preferably at least about 250: 1 and most preferably, the polymeric tapes have a ratio of average aspect in the cross section of 400: 1.
[0050] The fibers and tapes can be of any suitable denier. For example, the fibers may have a denier of from about 50 to about 3000 denier, more preferably from about 200 to 3000 denier, more preferably from about 650 to about 2000 denier, and most preferably from about 800 about 1500 denier. The tapes can have deniers from about 50 to about 30,000, more preferably from about 200 to 10,000 denier, even more preferably from about 650 to about 2000 denier, and most preferably from about 800 to about 1500 denier. The choice is governed by considerations of efficacy and ballistic cost. Thinner fibers / tapes are more expensive to manufacture and weave; but they can produce greater ballistic efficiency per unit of weight.
[0051] As stated above, a high modulus and high strength fiber / tape is one that has a preferred toughness of about 7 g / denier or more, preferably an elastic modulus of about 150 g / denier or more and a preferred burst energy energy of about 8 J / g or more, each as measured by ASTM D2256. Preferred fibers have a preferred toughness of about 15 g / denier or more, more preferably about 20 g / denier or more, even more preferably about 25 g / denier or more, even more preferably about 30 g / denier denier or more, even more preferably about 40 g / denier or more, even more preferably about 45 g / denier or more, and most preferably about 50 g / denier or more. Preferred tapes have a preferred toughness of about 10 g / denier or more, more preferably about 15 g / denier or more, even more preferably about 17.5 g / denier or more, and most preferably about 20 g / denier or more. Wider tapes will have lower tenacities. Preferred fibers / tapes also have a preferred modulus of elasticity of about 300 g / denier or more, more preferably about 400 g / denier or more, more preferably about 500 g / denier or more, more preferably about 1,000 g / denier or more and more preferably about 1500 g / denier or more. Preferred fibers / tapes also have a preferred breaking energy of about 15 J / g or more, more preferably of about 25 J / g or more, more preferably of about 30 J / g or more and most preferably have a burst energy of about 40 J / g or more. Preferred methods of forming each of the types of fibers and tapes that have these combined high strength properties are conventionally known in the art.
[0052] The fibers and tapes that form the ballistic-resistant substrate are preferably, but not necessarily, at least partially coated with a polymeric binder material. A binder is optional because some materials, such as polyethylene tapes of high modulus of elasticity, do not require a polymeric binder to join a plurality of said tapes into a molded layer or molded article. Useful ballistic-resistant substrates can also be formed from, for example, soft fabric tapes or fibrous products that do not require either a polymeric / resinous binding material or molding.
[0053] As used herein, a "polymeric" binder or matrix material includes resins and rubber. When present, the polymeric binder material, either partially or substantially, covers the individual fibers / tapes of the ballistic-resistant substrate, preferably substantially covers each of the fibers / tapes individually. The polymeric binder material is also commonly known in the art as a "polymeric matrix" material. These terms are conventionally known in the art and describe a material that binds the fibers or tapes together, either through their inherent adhesive characteristics or after having been subjected to well-known heat and / or pressure conditions.
[0054] Suitable polymeric materials include both low modulus elastomeric materials and high modulus rigid materials. As used here, the term tensile modulus means the modulus of elasticity, which for fibers is measured by the ASTM D2256 standard and the ASTM D638 standard for a polymeric binder material. The tensile properties of polymeric tapes can be measured by ASTM D882, or another suitable method, as determined by a person skilled in the art. The rigidity, impact and ballistic resistance properties of the articles formed from the composites of the invention are influenced by the elastic modulus of the polymeric binder that lines the fibers / tapes. A low or high modulus binder can comprise a variety of polymeric and non-polymeric materials. A preferred polymeric binder comprises a low elastomeric modulus material. For the purposes of this invention, a low elastomeric modulus material has a modulus of elasticity measured at about 41.4 MPa (6000) or less, according to the test procedures of ASTM D638. A low modulus polymer is preferably an elastomer having an elastic modulus of about 27.6 MPa (4000 psi) or less, more preferably about 16.5 MPa (2400 psi) or less, more preferably 8.23 MPa (1200 psi) or less, and more preferably it is about 3.45 MPa (500 psi) or less. The glass transition temperature (Tg) of the elastomer is preferably less than about 0 ° C, more preferably less than about -40 ° C, and more preferably less than about -50 ° C. The elastomer also preferably has an elongation at break of at least about 50%, more preferably at least about 100% and most preferably it has an elongation at break of at least about 300%.
[0055] A wide variety of materials and formulations with a low modulus can be used as the polymeric binder. Representative examples include polybutadiene, polyisoprene, natural rubber, ethylene-propylene copolymers, ethylene-propylene-diene terpolymers, polysulfide polymers, polyurethane elastomers, chlorosulfonated polyethylene, polychloroprene, plasticized polyvinyl chloride, butadiene elastomers. acrylonitrile, poly (isobutylene-co-isoprene), polyacrylates, polyesters, polyethers, fluorinated elastomers, silicone elastomers, ethylene copolymers, polyamides (useful with some types of fiber / tape), acrylonitrile butadiene styrene, polycarbonates, and combinations thereof, and combinations thereof, as well as other curable low modulus polymers and copolymers below the melting point of the fiber. Mixtures of different elastomeric materials, or mixtures of elastomeric materials with one or more thermoplastic materials, are also useful.
[0056] Particularly useful are block copolymers of conjugated dienes and aromatic vinyl monomers. Butadiene and isoprene are preferred conjugated diene elastomers. Styrene, vinyl toluene and t-butyl styrene are preferred aromatic conjugated monomers. Block copolymers that incorporate polyisoprene can be hydrogenated to produce thermoplastic elastomers having saturated hydrocarbon elastomer segments. The polymers can be single ABA type tri-block copolymers, type (AB) n (n = 2-10) multi-block copolymers or R- (BA) X radial configuration copolymers (X = 3- 150 ); where A is a block of an aromatic polyvinyl monomer and B is a block of a conjugated diene elastomer. Many of these polymers are commercially produced by Kraton Polymers of Houston, TX and described in "Kraton Thermoplastic Rubber", SC-68-81. Also useful are styrene-isoprene-styrene block copolymer (SIS) resin dispersions sold under the trademark PRINLIN® and commercially available from Henkel Technologies, based in Dusseldorf, Germany. Conventional low modulus polymeric binder polymers include polystyrene-polyisoprene-polystyrene block copolymers marketed under the trademark KRATON® produced commercially by Kraton Polymers.
[0057] Although low modulus polymeric binder materials are preferred for the formation of flexible materials for use in reinforcement, high modulus polymeric binder materials are preferred for the formation of rigid armor articles. High modulus rigid materials generally have an initial stress modulus greater than 41.37 MPa (6000 psi). Useful high modulus rigid polymeric binder materials include polyurethanes (both ether and ester based), epoxy polymers, polyacrylates, phenolic / polyvinyl butyral polymers (PVB), vinyl ester polymers, styrene-butadiene block copolymers, as well as mixtures of polymers, such as vinyl ester and diallyl or phenol-formaldehyde and polyvinyl butyral phthalate. A particularly useful rigid polymeric binder material is a heat-cured polymer that is soluble in saturated carbon-carbon solvents such as methyl ethyl ketone, and having a high tensile modulus when cured of at least about 6895 MPa (Ix106 psi), as measured by ASTM D638. Useful rigid polymeric binder materials are those described in U.S. Patent No. 6,642,159, the description of which is incorporated herein by reference. The polymeric binder, whether a low modulus material or a high modulus material, can also include filler materials; such as carbon black or silica, it can be expanded with oils, or it can be vulcanized by sulfur, peroxide, metal oxide or radiation curing systems, as is well known in the art.
[0058] Also preferred are polar resins or polar polymers, in particular polyurethanes within the range of materials, both soft and rigid materials in a stress module ranging from about 13.79 MPa (2,000 psi) to about 55.16 MPa (8000 psi). Preferred polyurethanes are applied as aqueous polyurethane dispersions that are more preferably free of co-solvents. These include aqueous anionic polyurethane dispersions and aqueous cationic polyurethane dispersions and aqueous non-ionic polyurethane dispersions. Particularly preferred are aqueous anionic polyurethane dispersions, and most preferred are aqueous anionic dispersions of aliphatic polyurethane. These include aqueous anionic polyester based polyurethane dispersions; aqueous dispersions of polyurethane based on aliphatic polyester; aqueous aliphatic polyurethane dispersions based on anionic aqueous aliphatic polyester, all of which are preferably co-solvent free dispersions. These also include anionic aqueous dispersions of polyether polyurethane; aqueous aliphatic polyether based polyurethane dispersions; and aqueous anionic aliphatic polyether based polyurethane dispersions, all of which are preferably co-solvent free dispersions. Likewise, all corresponding variations (polyester based; aliphatic polyester based; polyether based; aliphatic polyether based, etc.) of aqueous cationic and non-ionic aqueous dispersions are preferred. Most preferred is an aliphatic polyurethane dispersion that has a modulus of elasticity at 100% elongation of about 4.82 MPa (700 psi) to about 20.68 MPa (3000 psi). More preferred are aliphatic polyurethane dispersions with a 100% elongation modulus of about 6.89 MPa (1000 psi) or more, and even more preferably about 7.58 MPa (1100 psi) or more. Most preferred is an aliphatic polyether based polyurethane dispersion having a modulus of 6.89 MPa (1000 psi) or more, preferably 7.58 MPa (1100 psi) or more. The most preferred binders are those that will convert most of the kinetic energy transmitted by a projectile to a shock wave form, which is then mitigated by the vacuum panel.
[0059] The methods for applying a polymeric binder material to the fibers and tapes to impregnate fiber / tape layers with the binder are well known and easily determined by one usually skilled in the art. The term "impregnated" is here considered to be synonymous with "incorporated", "coated", or otherwise applied with a polymeric coating in which the binder material diffuses into the layer and is not simply on the surface of the layer. Any suitable application method can be used to apply the polymeric binder material and in particular the use of a term such as "coated" is not intended to limit the method by which it is applied to the filaments / fibers. Useful methods include coating the polymers or polymeric solutions, for example, by spraying, extruding or roller coating on the fibers / tapes, as well as transporting the fibers / tapes through a melted polymer or polymeric solution. Most preferred are methods that substantially coat or encapsulate each of the fibers / tapes individually, and cover all or substantially the entire surface area of the fiber / tape with the polymeric binder material.
[0060] Fibers and tapes which are interwoven in the form of fibrous weave layers or layers of weave tapes are preferably at least partially coated with a polymeric binder, followed by a consolidation step similar to that carried out with the nonwoven layers. Such a consolidation step can be conducted to fuse several layers of fibers or tapes woven together, or to further fuse a binder with said fibers / tapes of said weave layers. For example, a plurality of layers of woven fibers do not necessarily have to be consolidated, and can be connected by other means; such as with a conventional adhesive, or by sewing, while a polymeric binder coating is generally necessary to efficiently consolidate a plurality of layers of fibers in a nonwoven form.
[0061] Fabrics can be formed using techniques that are well known in the art using any weave fabric, such as single weave, crow's foot weave, satin weave, twill weave and the like. Taffeta stitch is more common, where the fibers are woven together, in an orthogonal 0 ° / 90 ° orientation. Typically the weaving of fabrics is carried out before coating the fibers with a polymeric binder, where the fabrics are thus impregnated with the binder. However, the invention is not intended to be limited by the stage at which the polymeric binder is applied. 3D type weaving methods in which multilayer fabric structures are manufactured by warp and weft weaving both horizontally and vertically are also useful. Coating or impregnation with a polymeric binder material is also optional with such fabrics in 3D-type weaving, but a binder is not necessarily necessary for the manufacture of a ballistic-resistant substrate with multilayered weaving of the type 3D.
[0062] Methods for producing nonwoven (nonwoven layers / thicknesses) from fibers and tapes are well known in the art. For example, in a preferred method for forming non-woven fabrics, a plurality of fibers / tapes are arranged in the form of at least one arrangement, typically being arranged as a composite fiber / tape comprising a plurality of fibers / tapes aligned in a substantially parallel unidirectional matrix. In a typical process, ribbons or bundles of fibers are supplied from a warp and guided through guides and, optionally, one or more spacer bars for a collimation comb, which is usually followed by coating the fibers / ribbons with a polymeric material binder. Typically a bundle of fibers will have about 30 to about 2000 individual fibers. When starting with filament bundles, the diffuser bars and the collimator comb disperse and spread the fibers that were in bundles, and rearrange them side-by-side in a coplanar configuration. The ideal fibrous spread results in individual filaments or individual fibers being positioned mutually close together in a single fibrous plane, forming a parallel, substantially unidirectional arrangement of fibers without the addition of mutually overlapping fibers.
[0063] After the fibers / tapes are coated with an optional binder material the coated fibers / tapes are configured as fibrous layers of the non-woven type comprising a plurality of non-woven, overlapping layers, which are consolidated in the form of an element monolithic, single layer. In a preferred non-woven fabric structure for the ballistic-resistant substrate, a plurality of stacked overlapping unitapes is formed in which the parallel fibers / tapes of each individual layer (unitape) are positioned orthogonally with respect to the parallel fibers / tapes of each individual adjacent layer in relation to the longitudinal fibrous direction of each individual layer. The stack of stacked fibers / tapes of the non-woven type is consolidated by the effect of heat and pressure, or by adhesion of the coatings of the individual layers of fibers / tapes, in order to form a monolithic single layer element, which is referred to in the art as a single layer consolidated weft, where a "consolidated weft" describes a consolidated (incorporated) combination of fiber layers / tapes with the optional polymeric matrix / binder. The ballistic-resistant substrate can also comprise a consolidated hybrid combination of fabrics and nonwovens, as well as combinations of nonwovens formed from layers of unidirectional fibers and felted fabrics of the nonwoven type.
[0064] Much more typically, the fiber / tape layers of the non-woven or weaving type include from 1 to about 6 layers, but can include as many as about 10 to about 20 layers as may be desired for various applications. The greater the number of layers translates into greater ballistic resistance, but also greater weight. As is conventionally known in the art, excellent ballistic resistance is achieved when individual layers of fiber / tape are arranged in intersection, such that the direction of alignment of one layer is rotated at an angle to the direction of alignment of the fibers of another layer. More preferably, the layers of fibers are assembled in the form of layers in orthogonal crossing at angles of 0 ° and 90 °, but adjacent layers can be aligned at virtually any angle between 0 ° and about 90 ° with respect to the longitudinal direction of the fiber of the other. layer. For example, a five-layer structure of the non-woven type may have layers oriented at 0 ° / 45 ° / 90 ° / 45 ° / 0 ° or at other angles. Such rotated alignments are described, for example, in US Patent Nos. 4,457,985; 4,748,064; 4,916,000; 4,403,012; 4,623,574; and 4,737,402, all of which are incorporated herein by reference as long as they are not incompatible with the present.
[0065] Methods of consolidating fiber layers / layers to form complex compounds are well known, such as through the methods described in United States patent US 6,642,159. Consolidation can occur through drying, cooling, heating, pressure or a combination of these. Heat and / or pressure may not be necessary, as the layers of fibers or fabrics can simply be glued together, as is the case in a wet lamination process. Typically, consolidation is done by positioning the individual fiber / ribbon layers on top of each other, under conditions of sufficient heat and pressure to induce the layers to combine in the form of a unitary fabric. Consolidation can be carried out at temperatures ranging from about 50 ° C to about 175 ° C, preferably between about 105 ° C to about 175 ° C, and at pressures ranging from about 0.034 MPa (5 psig) ) at about 17 MPa (2500 psig), for from about 0.01 seconds to about 24 hours, preferably from about 0.02 seconds to about 2 hours. Upon heating, it is possible that a coating of polymeric binder can be induced to adhere or to flow without being completely melted. However, in general, if the polymeric binder material is caused to melt, relatively little pressure is required to form the composite, whereas if the bonding material is only heated to a bonding point, more pressure is usually required. As is conventionally known in the art, consolidation can be carried out in a calender assembly, in a flat bed laminator, in a press or in an autoclave. Consolidation can also be carried out by vacuum molding the material in a mold that is placed under vacuum conditions. Vacuum molding technology is well known in the art. Most commonly, a plurality of orthogonal fiber / tape webs are mutually "glued" together with the binder polymer and run through a flatbed laminator to improve the uniformity and strength of the bond. In addition, the polymer application / bonding steps may comprise two separate steps or a single consolidation / lamination step.
[0066] Alternatively, consolidation can be achieved by molding under pressure and heat in a suitable molding apparatus. Generally, molding is conducted at a pressure of between about 50 psi (344.7 kPa) to about 5,000 psi (34,470 kPa), more preferably about 100 psi (689.5 kPa) to about 3000 psi (20,680 kPa) ), more preferably from about 150 psi (1034 kPa) to about 1500 psi (10,340 kPa). Molding can alternatively be carried out at higher pressures ranging from about 5,000 psi (34,470 kPa) to about 15,000 psi (103,410 kPa), more preferably between about 750 psi (5,171 kPa) to about 5000 psi, and more preferably about 1,000 psi and about 5,000 psi. The molding step can take from about 4 seconds to about 45 minutes.
[0067] Preferred molding temperatures range from about 200 ° F (~ 93 ° C) to about 350 ° F (~ 177 ° C), more preferably at a temperature of about 200 ° F to about 300 ° F and even more preferably at a temperature from about 93 ° C (200 ° F) to about 137.8 ° C (280 ° F). The pressure under which the fiber / tape layers are molded has a direct effect on the stiffness or flexibility of the resulting molded product. In particular, the greater the pressure at which they are molded, the greater the stiffness, and vice versa. In addition to the molding pressure, the quantity, thickness and composition of the fiber / tape layers and the type of polymeric binder coating also directly influence the stiffness of the ballistic-resistant substrate thus formed.
[0068] Although each of the molding and consolidation techniques described here is similar, each process is different. In particular, molding is a batch process and a consolidation process is generally an ongoing process. In addition, molding typically involves the use of a mold, such as a shape mold or a tool-type mold when forming the flat panel, and does not necessarily result in a flat product. Usually the consolidation is done in a flat bed laminator, a set of jaws per calender or as a wet lamination in order to produce soft (flexible) fabrics for use in body armor. Molding is typically reserved for the manufacture of hard reinforcement; for example, rigid plates. In any process, the appropriate temperatures, pressures and times are generally dependent on the type of polymeric binder coating materials, the content of the polymeric binder, the process used and the type of fiber / tape.
[0069] When the ballistic-resistant substrate includes a binder / matrix, the total weight of the binder / matrix comprising the ballistic-resistant substrate preferably comprises from about 2% to about 50% by weight, more preferably from about 5% to about 30%, more preferably from about 7% to about 20%, and more preferably from about 11% to about 16% by weight of fibers / tapes plus the weight of the coating. A lower binder / matrix content is suitable for weaving fabrics, where a polymeric binder content greater than zero, but less than 10% by weight of fibers plus the weight of the coating is typically much more preferred; however, this is not intended to be interpreted as a limiting factor. For example, aramid fabrics produced by weaving impregnated with phenolic / PVB are sometimes manufactured with a higher resin content; from about 20% to about 30%, although a content of around 12% is typically preferred.
The ballistic-resistant substrate may also optionally comprise one or more layers of thermoplastic polymers attached to one or both of its outer surfaces. Suitable polymers for the thermoplastic polymer layer include not only polyolefins, polyamides, polyesters (particularly polyethylene terephthalate (PET) and PET copolymers), polyurethanes, vinyl polymers, ethylene-vinyl alcohol copolymers, ethylene octane copolymers, acrylonitrile copolymers. , acrylic polymers, vinyl polymers, polycarbonates, polystyrenes, fluoropolymers and the like, as well as co-polymers and mixtures thereof, including ethylene vinyl acetate (EVA) and acrylic ethylene acid. Also useful are polymers of natural and synthetic rubber. Of these, polyolefin and polyamide layers are preferred. The preferred polyolefin is a polyethylene. Non-limiting examples of useful polyethylene are low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), medium density linear polyethylene (LMDPE), very low density linear polyethylene (VLDPE) , linear ultra-low density polyethylene (ULDPE), high density polyethylene (HDPE) and copolymers and mixtures thereof. Also useful are SPUNFAB® polyamide webs commercially available from Spunfab, Ltd, of Cuyahoga Falls, Ohio (registered trademark for Keuchel Associates, Inc.), as well as THERMOPLAST ™ and HELIOPLAST ™ blankets, commercially available webs and films from Protechnic SA of Cernay , France. Such a layer of thermoplastic polymer can be bonded to the surfaces of ballistic-resistant substrates using well-known techniques, such as by thermal lamination. Typically, lamination is done by positioning the individual layers, on top of each other, under conditions of sufficient heat and pressure to cause the layers to combine into a unitary structure. The lamination can be conducted at temperatures ranging from about 95 ° C to about 175 ° C, preferably between about 105 ° C to about 175 ° C, at pressures ranging from about 5 psig (0.034 MPa) to about 100 psig (0.69 MPa), for about 5 seconds to about 36 hours, preferably about 30 seconds to about 24 hours. Such layers of thermoplastic polymers can alternatively be bonded to the surfaces of ballistic-resistant substrates with hot-glue fibers or hot-melt fibers, as can be understood by the one usually skilled in the art.
[0071] In embodiments where the ballistic-resistant substrate does not include a polymeric binder material coating the fibers or tapes that form the substrate, it is preferred that one or more layers of thermoplastic polymer, as described above, be employed to join the layers fiber / tape layers together or improve the connection between adjacent fiber / tape layers. In one embodiment, a ballistic-resistant substrate comprises a plurality of unidirectional fiber layers or tape layers, wherein a layer of thermoplastic polymer is positioned between each adjacent fiber layer or tape layer. For example, in a preferred embodiment, the ballistic-resistant substrate has the following structure: thermoplastic polymer film / UDT without 0 ° binder / thermoplastic polymer film / UDT thermoplastic polymer film without 90 ° binder. In this representative embodiment, the ballistic-resistant substrate may include additional layers of UDT without binder, where a thermoplastic polymer film is present between each pair of adjacent UDT layers. In addition, in this representative embodiment, a unitape (UDT) can comprise a plurality of parallel fibers or a plurality of parallel tapes. This representative modality is not intended to be strictly limiting. For example, the elongated UDT bodies (i.e. fibers or tapes) of the UDT layers can be oriented at other angles, such as the UDT can be oriented at other angles, such as the thermoplastic polymer / UDT film without 0 binder ° / thermoplastic polymer film / UDT without 45 ° binder / thermoplastic polymer film / UDT thermoplastic polymer film without 90 ° binder / UDT without 45 ° binder / thermoplastic polymer film / UDT without 0 ° binder / thermoplastic polymer film , etc.; or the layers can be oriented at other angles. The most external thermoplastic polymer films can also be optionally excluded as determined by the one usually skilled in the art. Such structures without binders can be made by stacking the component layers on top of each other in a coextensive way and consolidating / molding them together according to the consolidation / molding conditions described here.
[0072] The thickness of the ballistic-resistant substrate will correspond to the thickness of the individual fibers / tapes and the number of fiber / tape layers or layers incorporated in the substrate. For example, a preferred weave fabric will have a preferred thickness of about 25 μm to about 600 μm per thickness / layer, more preferably from about 50 μm to about 385 μm and most preferably from about 75 μm to about 255 μm per thickness / layer. A preferred two-layer nonwoven fabric will have a preferred thickness of about 12 μm to about 600 μm, more preferably from about 50 μm to about 385 μm and most preferably from about 75 μm to about 255 μm. Any thermoplastic polymeric layers are preferably very thin, having a layer thickness of about 1 μm to 250 μm, more preferably about 5 μm to about 25 μm and more preferably about 5 μm to about 9 μm. Discontinuous wefts; such as SPUNFAB® nonwoven fabrics are preferably applied with a weight basis of 6 grams per square meter (gsm). Although such thicknesses are preferred, it is to be understood that other thicknesses can be produced to meet a particular need and still fall within the scope of the present invention.
[0073] The ballistic-resistant substrate comprises multiple layers or thicknesses of fiber / tape, which layers are stacked on top of each other and optionally, but preferably, consolidated. The ballistic-resistant substrate will have a preferred composite surface density of from about 0.2 psf to about 8.0 psf, more preferably from 0.3 psf to about 6.0 psf, even more preferably from a from about 0.5 psf to about 3.5 psf, even more preferably from about 1 psf to about 3.0 psf, and most preferably from about 1.5 psf to about 2.5 psf.
[0074] In modalities in which the ballistic-resistant substrate is a rigid material, non-fibrous base, non-tape based, the substrate does not comprise either fibers or tapes, but comprises a rigid material, such as a ceramic material, glass, metal, a metal-filled composite, a ceramic-filled composite, a glass-filled composite, a cermet type material, or a combination of those mentioned. Of these, the preferred materials are steel, especially high hardness steel (HHS), as well as aluminum, titanium alloys or combinations thereof. Preferably, such a rigid material comprises a rigid plate that is connected to one or more vacuum panels in a face-to-face relationship, in the same way as the substrates formed from both tape-based substrates and the substrates fiber-based. If a ballistic-resistant article of the invention incorporates several substrates, it is preferable that only one rigid substrate is used with the rest of the substrates being fibrous and / or tape-based, preferably with the rigid substrate positioned as the face of clash of the article.
[0075] Three most preferred types of ceramic materials include aluminum oxide, silicon carbide and boron carbide. In this regard, a rigid substrate may incorporate a single monolithic ceramic plate, or may comprise small ceramic tiles or spheres suspended in flexible resin, such as a polyurethane. Suitable resins are well known in the art. In addition, several layers or rows of tiles can be attached to a surface of the vacuum panel. For example, 7.62 cm x 7.62 cm x 0.254 cm (3 in. X 3 in. X 0.1 in.) Ceramic tiles can be mounted on a 30.48 cm x 30.48 cm panel ( 12 in. X 12 in.) Using a thin polyurethane adhesive film, preferably with all ceramic tiles being aligned such that no gap is present between the tiles. A second row of panels can then be connected to the first row of ceramic material, with an offset such that the joints are dispersed. This can continue all the way down and across to cover the entire surface of the vacuum panel. In addition, a substrate formed from a rigid non-fibrous base material, such as HHS, can be attached to a fibrous base substrate, which is then fibrous substrate which is then attached to the face of a vacuum panel. For example, in a preferred configuration, a ballistic-resistant article of the invention comprises a ceramic material plate / a molded fibrous support material / a vacuum panel / an optional air space / a soft or hard fibrous reinforcement material. Other settings can also be useful.
[0076] As previously mentioned, the ballistic-resistant substrate and the vacuum panel can be mutually coupled with or without the surfaces mutually touching. In preferred embodiments, at least one ballistic-resistant substrate is directly attached to at least one vacuum panel with an adhesive. Any suitable adhesive material can be used. Suitable adhesives include not only elastomeric materials, such as polyethylene, cross-linked polyethylene, chlorosulfonated polyethylene, ethylene copolymers, polypropylene, propylene copolymers, polybutadiene, polyisoprene, natural rubber, ethylene-propylene copolymers, ethylene terpolymers -propylene-diene, polysulfide polymers, polyurethane elastomers, polychloroprene, polyvinyl chloride plasticized with one or more plasticizers, which are well known in the art (such as dioctyl phthalate), acrylonitrile butadiene elastomers, poly (isobutylene-co -isoprene), polyacrylates, polyesters, unsaturated polyesters, polyethers, fluoroelastomers, silicone elastomers, ethylene copolymers, thermoplastic, phenolic elastomers, epoxy polymers, polybutals, styrene-styrene-isoprene types or styrene-isoprene types butadiene-styrene, and other conventionally suitable adhesive compositions containing known in art. Particularly preferred adhesives include methacrylate adhesives, cyanoacrylate adhesives, UV curing adhesives, epoxy adhesives, urethane adhesives and mixtures of the above materials. Of these, an adhesive comprising a polyurethane thermoplastic adhesive, particularly a mixture of one or more polyurethane thermoplastic materials with one or more other thermoplastic polymers, is preferred. Most preferably, the adhesive comprises polyurethane aliphatic polyether. Such adhesives can be applied, for example, in the form of a hot melt, film, paste or spray, or as a two-component adhesive liquid.
[0077] Other means suitable for the direct connection of the elements include not exclusively sewing or stapling together, as well as fixing them with pins or screws, such that their surfaces are mutually in contact. Dowels and screws can also be used to indirectly couple the substrate and the vacuum panel. To staple, sew, peg or screw the vacuum panel to the ballistic-resistant substrate, the vacuum panel must have a peripheral edge or other element that facilitates fixation without drilling the panel and destroying the vacuum. Alternatively, the ballistic-resistant substrate and the vacuum panel can be indirectly connected to each other by means of which they are joined together with a connector instrument where together they form integral elements of a single unitary article, but their surfaces do not touch each other. In this embodiment, the ballistic-resistant substrate and the vacuum panel can be positioned mutually apart by at least about 2 mm. Various instruments can be used to connect the ballistic-resistant substrate and the vacuum panel. Non-limiting examples of connecting instruments include connecting anchors, such as rivets, dowels, nails, screws and tacks, where the surfaces of the substrate and the panel are kept mutually apart, such that there is a space between the ballistic-resistant panel and the panel. vacuum. Also suitable are straps with hook and loop fasteners, such as VELCRO® brand products commercially available from Velcro Industries BV in Curacao, the Netherlands, or 3M ™ hook and loop fasteners, double-sided tape. face, and the like.
[0078] Also useful are flat spacing strips; spacing frames, as described in the proprietary US Patent No. 7,930,966, which is incorporated herein by reference to the extent consistent with the foregoing. Suitable spacing frames include slit frames, where the panels of the invention can be positioned within the slits (or grooves) of the frame, which hold them in place; and frames not provided with slits that are positioned between, and fixed to the adjacent panels, thus separating and connecting said panels. The frames can be formed from any material as can be determined by the one usually skilled in the art, including wooden frames, metal frames and fiber-reinforced polymer composite frames. Extrusion-produced channels can be formed from any material that can be extruded, including metals and polymers.
[0079] Also suitable are frames or leaves; such as wooden sheets, sheets of fibrous material, sheets made of particulate material, sheets of ceramic material, metal sheets, plastic sheets or even a layer of foam positioned between, and in contact with both a ballistic-resistant substrate surface and the vacuum panel. These mentioned are described in more detail in the proprietary US Patent No. 7,762,175, which is incorporated herein by reference to the extent that it is consistent with the foregoing.
[0080] Figure 7 illustrates a modality where a ballistic-resistant substrate 210 is indirectly coupled with a vacuum panel 212 by means of connecting anchors 214 at the corners of substrate 210 and panel 212. Figure 8 illustrates a modality in which the substrate 210 and panel 212 are separated by a slotted frame. Such connector instruments are specifically exclusive to adhesives and synthetic fabrics, such as other ballistic-resistant fabrics, other non-ballistic-resistant fabrics, or fiberglass.
[0081] The ballistic-resistant articles of the invention are particularly suitable for any application in body armor that requires a low index of deformation on the posterior face; that is, ideal resistance to blunt blunt trauma, including soft and flexible armor articles, as well as rigid and hard armor articles, as well as for the defense of vehicles and structural elements; such as building walls. When used, the ballistic-resistant articles of the invention must be oriented such that the ballistic-resistant substrate is positioned as the impact face of the article and said vacuum panel is positioned behind the ballistic-resistant substrate in order to receive any wave of shock that begins due to a projectile impact with the ballistic-resistant substrate. The generation of a shock wave is a significant component of the energy transferred to the armature upon projectile impact, with low deflection materials converting more of the kinetic energy from a projectile into the form of a shock wave than high deflection materials. . The functions of the vacuum panel to reduce or totally eliminate this energy resulting from the shock wave, ensuring that the energy resulting from the impact of the projectile is dissipated in a way that reduces the deformation of the rear face of the composite, while preserving superior resistance ballistic penetration.
[0082] In this regard, ballistic-resistant articles of the invention that incorporate an appropriate vacuum panel support achieve significant improvement in the signature of the back face, compared to armor articles that do not have a back support structure or that use a material conventional support; such as closed cell foam, open cell foam or a flexible hive type. Improved signature performance of the back face can also be achieved at lower weights when replacing the vacuum panels with ballistic material that are often used in place of an armature support material.
[0083] The following examples serve to illustrate the invention. COMPARATIVE EXAMPLES 1-9 and 13-19 INVENTIVE EXAMPLES 10-12
[0084] Ballistics tests were conducted to determine the influence of a support material of the type vacuum panel in the mitigation of the resulting shock wave and the resulting depth of deformation of the posterior face.
[0085] All test conditions were kept constant in each example, except for the type of support material. The support material used for each of the samples is identified in Table 1. The McMaster-Carr B43NES-SE support used in Comparative Examples 1-3 was closed cell foam Neoprene / EPDM / SBR (Neoprene / ethylene propylene diene monomer / styrene-butadiene rubber) 6.35 mm (0.25 inch) thick, commercially available from McMaster-Carr of Robbinsville, NJ. The "(2X) United Foam XRD 15 PCF" support used in Comparative Examples 4-6 consisted of two layers of Qycell irradiated closed cell polyethylene foam 3.18 mm (0.125 inch) thick, commercially available from UFP Technologies of Raritan, NJ and manufactured by Qycel Corporation of Ontario, CA. The "open cell foam with adhesive backing" used in Comparative Examples 7-9 was 6.35 mm (0.25 inch) thick, super-cushioned, water resistant, super-cushioned open cell polyurethane foam with an adhesive backing , commercially available from McMaster-Carr. The "NanoPore Insulation" used in Inventive Examples 10-12 was a 6.35 mm (0.25 inch) thick vacuum panel, commercially available from NanoPore Insulation LLC of Albuquerque, NM. The interior of the vacuum panel includes a porous carbon fiber mat as an internal support structure, which prevents the envelope from collapsing when the vacuum is removed.
[0086] The support "SUPRACOR Honeycomb, A2 0.25 CELL / E0000139" used in Comparative Example 13 was a honeycomb material, closed cell, flexible, 4.8 mm (0.19 inch) thick, commercially available from SUPRACOR, Inc. of San Jose, CA. The "non-woven type PE fabric armor" used in Comparative Examples 14-15 was a proprietary non-woven type, with a thickness of 6.35 mm (0.25 inch), commercially available from Honeywell International Inc. It consisted of 38 unidirectional layers of double thickness (0 ° / 90 °) comprising fibers of the type of ultra high molecular weight Polyethylene (UHMW PE) and a polyurethane binder resin, and having a surface density of 1.00 psf. The support "SUPRACOR Honeycomb, ST8508, 0.187 Cell, ST05X2 / E0000139" used in Comparative Example 16 was made of flexible honeycomb material, open cells, thick 4.8 mm (0.19 inch), commercially available from SUPRACOR, Inc. The support "SUPRACOR Honeycomb, SU8508, 0.25 Cell, SU05X2 backing / E0000139" used in Comparative Example 17 was a flexible open cell honeycomb material, 4.8 mm (0.19 inch) thick, commercially available from SUPRACOR, Inc.
[0087] Each support material was bonded to a 31-layer plate of four thicknesses (0 ° / 900/00/900) of a non-woven polyethylene fabric in a polyurethane matrix; molded at 132 ° C (270 ° F) and 18.6 MPa (2700 psi), commercially available from Honeywell International Inc., Morristown, NJ. Each plate was a 15.2 cm x 15.2 cm (6 "x6") square and having a surface density of 1.63 lb / ft2 (psf). The support material and the reinforcement plate were mutually fixed with double-sided adhesive tape (Tesa® Reinforced DS tape; Surface density = 0.048 psf).
[0088] All samples were fired according to the standard described by NIJ 0101.04, Type III, in which a sample is brought into contact with the surface of a deformable clay support material. All samples were shot once with a 9 mm RN projectile, 124 grain metallic capsule at 1430 ft / second (fps) ± 30 fps with the armor plate positioned as the impact face and with the support material positioned directly over the clayey surface. In Comparative Examples 18 and 19, which did not use support material, the reinforcement plate was positioned directly on the clay surface. The impact of the projectile caused a depression in the clay behind the sample, identified as the signature of the posterior face (BFS). The BFS measurements for each example are identified in the Table



CONCLUSIONS
[0089] As illustrated by the data in Table 2, Inventive Examples 10-12 using the Nanopore vacuum panel as a backing material had significantly less BFS by 9 mm (improved BFS performance) compared to samples tested with any other support material, or without support material. The average BFS with a 9 mm impact for the three Inventive Examples was 20.5 mm. The mean BFS of 9 mm for Comparative Examples 1-3, which used McMaster-Carr Neoprene / EPDM / SBR closed cell foam as a support material was 27.3 mm. The mean BFS of 9 mm for Comparative Examples 4-6 using United Foam irradiated closed cell cross-linked polyethylene foam as support material was 27.0 mm. The average BFS of 9 mm BFS for Comparative Examples 7-9 that used super-cushioned, water-resistant, open-cell polyurethane foam, with adhesive backing, as a backing material was 28.1 mm. The 9 mm BFS for Comparative Example 13, which used flexible closed-cell honeycomb, SUPRACOR as the support material was 27.1 mm. The mean BFS of 9 mm for Comparative Examples 14-15 that used the proprietary textile reinforcement made of non-woven polyethylene (PE) as a support material was 30.15 mm. The 9 mm BFS for Comparative Example 16 that used open cell, flexible SUPRACOR honeycomb material as a support material was 27.3 mm. The 9 mm BFS for Comparative Example 17, which used the Supracor flexible, open cell honeycomb material as a support material, was 28.3 mm. The mean BFS of 9 mm for Comparative Examples 18-19, which were tested without the use of a support material performed the worst, with a mean BFS of 34.4 mm.
[0090] The BFS depth data as summarized in Table 2 are illustrated graphically in Figure 9. As shown in Figure 9, the average that most closely matches that of the vacuum panel supported composites of the invention was that of polyethylene foam of closed cells of Comparative Examples 4-6, having an average BFS of 27.0 mm for impacts with 9 mm, which is 31.7% (6.5 mm) greater than the average BFS of 20.5 mm for impacts with 9 mm achieved by the present invention. Without averaging the data, comparing the best result of the comparative sample (Comparative Example 5 to 26.1 mm) with the worst result of the inventive sample (Example 12 to 23.7 mm) produces an improvement of 2.4 mm; more than 10%.
[0091] Although the present invention has been particularly shown and described with reference to the preferred modalities, it will be easily perceived by one usually skilled in the art that various changes and modifications can be made, without departing from the spirit and scope of the invention. It is intended that the claims are interpreted to cover the revealed modalities, their alternatives that have been discussed here, and all their equivalents

权利要求:
Claims (11)
[0001]
1. BALLISTIC-RESISTANT ARTICLE, characterized by comprising: a) a vacuum panel (212) having a first and a second surface, said vacuum panel (212) comprising an enclosure and an internal volume defined by the enclosure, in which at least at least a part of said internal volume is an unoccupied space and in which said internal volume is under vacuum pressure; and b) at least one ballistic-resistant substrate (210) having external surfaces, said at least one ballistic-resistant substrate (210) is coupled with at least one of said first and second surface of said vacuum panel (212) said substrate comprising fibers and / or tapes having a toughness of about 7 g / denier or more and an elastic modulus of about 150 g / denier or more, said substrate comprising a rigid non-tape based material, and non-fibrous base; in which the at least one vacuum panel (212) and the at least one ballistic-resistant substrate (210) are separable from each other; and in which the at least one outer surface of the at least one ballistic-resistant substrate (210) is directly coupled with at least one of the first and second surfaces of said vacuum panel (212), or in which the vacuum panel (212 ) and the at least one ballistic-resistant substrate (210) are indirectly coupled to one or more of said surfaces with a connecting instrument so that the surfaces do not touch each other directly.
[0002]
2. Article according to claim 1, characterized in that said enclosure comprises a flexible, sealed polymeric envelope, and has physical support materials or structures within the inner volume or in which the vacuum panel (212) has walls manufactured from from a rigid metal capable of retaining its shape while under vacuum and in which 100% of the interior volume of said vacuum panel (212) is unoccupied space.
[0003]
Article according to claim 1, characterized in that at least one ballistic-resistant substrate (210) is directly connected to at least one of said first and second surfaces of said vacuum panel (212), and in which said housing comprises a flexible, sealed polymeric envelope.
[0004]
An article according to claim 1, characterized in that at least one ballistic-resistant substrate (210) is indirectly coupled with at least one of said first and second surfaces of said vacuum panel (212), wherein a laminar layer is present between said ballistic-resistant substrate (210) and said vacuum panel (212).
[0005]
5. Article according to claim 1, characterized in that a plurality of vacuum panels is coupled with each ballistic-resistant substrate (210), in which the vacuum panels are in the form of a sheet incorporating said plurality of vacuum panels positioned close to each other edge-to-edge with perforations between panels.
[0006]
6. Article according to claim 1, characterized in that at least one ballistic-resistant substrate (210) is directly connected to at least one of said first and second surfaces of said vacuum panel (212), in which 100% of the internal volume of said vacuum panel (212) is an unoccupied space, in which said vacuum panel (212) has walls manufactured from a rigid metallic material capable of maintaining its shape under vacuum
[0007]
7. BALLISTIC-RESISTANT BODY ARMATURE ARTICLE FOR REDUCING THE BACK DEFORMATION EXTENSION, formed by the ballistic-resistant article of claim 1, characterized by the at least one ballistic-resistant substrate (210) is positioned as the impact face ballistic-resistant armor article and said vacuum panel (212) is positioned behind said at least one ballistic-resistant substrate (210) to receive any shock wave that starts due to an impact of a projectile with said by least one ballistic-resistant substrate (210); in which the at least one vacuum panel (212) and the at least one ballistic-resistant substrate (210) are separable from each other; and in which the at least one outer surface of the at least one ballistic-resistant substrate (210) is directly coupled with at least one of the first and second surfaces of said vacuum panel (212), or in which the vacuum panel (212 ) and the at least one ballistic-resistant substrate (210) are indirectly coupled to one or more of said surfaces with a connector instrument so that the surfaces do not directly touch each other.
[0008]
Ballistic-resistant body armor article according to claim 7, characterized in that said vacuum panel (212) comprises a flexible, sealed polymeric envelope, and has physical support materials or structures within the interior volume, or in which the vacuum panel (212) has walls made from a rigid metal capable of retaining its shape while under vacuum and in which 100% of the interior volume of said vacuum panel (212) is unoccupied space
[0009]
Ballistic-resistant body armor article according to claim 7, characterized in that said substrate comprises said rigid material, in which said rigid material comprises steel, an aluminum alloy, titanium or a combination thereof.
[0010]
10. METHOD FOR FORMING A BALLISTIC-RESISTANT ITEM, characterized by comprising: a) providing a vacuum panel (212) having a first and a second surface, said vacuum panel (212) comprising an enclosure and an internal volume defined by casing, in which at least a part of said internal volume is an unoccupied space and in which said internal volume is under vacuum pressure; and b) coupling at least one ballistic-resistant substrate (210) with at least one of said first and second surface of said vacuum panel (212), said substrate comprising fibers and / or tapes having a toughness of about 7 g / denier or more and an elastic modulus of about 150 g / denier or more, or wherein said substrate comprises a non-tape, non-fiber, rigid material; where said at least one ballistic-resistant substrate (210) is positioned as the impact face of the ballistic-resistant article and said vacuum panel (212) is positioned behind said at least one ballistic-resistant substrate (210) for receive any shock wave that begins due to a projectile impact with said at least one ballistic-resistant substrate (210), in which at least one vacuum panel (212) and at least one ballistic-resistant substrate ( 210) are separable from each other; and in which the at least one outer surface of the at least one ballistic-resistant substrate (210) is directly coupled with at least one of the first and second surfaces of said vacuum panel (212), or in which the vacuum panel (212 ) and the at least one ballistic-resistant substrate (210) are indirectly coupled to one or more of said surfaces with a connector instrument so that the surfaces do not directly touch each other.
[0011]
11. Method according to claim 10, characterized by the fact that said vacuum panel (212) comprises a flexible, sealed polymeric envelope and has materials or physical support structures within the internal volume, or in which the panel of vacuum (212) has walls manufactured from a rigid material capable of maintaining its shape while under vacuum and in which 100% of the interior volume of said vacuum panel (212) is an unoccupied space.

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法律状态:
2018-11-13| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2019-12-10| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2020-09-08| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application [chapter 6.1 patent gazette]|

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2021-01-05| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-03-16| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 09/03/2014, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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US13/803,521|2013-03-14|

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US13/803,521|US9291440B2|2013-03-14|2013-03-14|Vacuum panels used to dampen shock waves in body armor|

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PCT/US2014/022206|WO2014197022A2|2013-03-14|2014-03-09|Vacuum panels used to dampen shock waves in body armor|

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