• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a nonwoven fabric containing cellulosic fibers which contain at least partially incorporated zinc oxide particles and which is additionally impregnated with a liquid, and a process for its preparation and its use, in particular for the production of preservative-free wet wipes.
    公开号:AT516414A1
    申请号:T790/2014
    申请日:2014-10-28
    公开日:2016-05-15
    发明作者:
    申请人:Chemiefaser Lenzing Ag；
    IPC主号:
    专利说明:

    Liquid-saturated nonwoven fabric containing zinc oxide stains
    cellulose fibers
    The present invention relates to a nonwoven fabric containing cellulosic fibers which at least partially contain incorporated zinc oxide particles and which is additionally impregnated with a liquid, and a process for its preparation and its use, in particular for producing preservative-free wet wipes.
    State of the art
    Against the background of rapidly changing living conditions and habits, including increasing mobility, increasing prosperity, higher hygiene requirements and an increasing lack of time, in recent years, the need for wet wipes, which are used for cleaning hard and soft surfaces, increased strongly. These are carrier materials, preferably nonwovens, which are treated with an active or active substance-containing impregnating solution, packaged and placed on the market in the moist state, for example as refreshing, household, toilet, make-up or baby wipes. The main areas of application are cosmetics (Personal Care, Baby Care) and object cleaning. Depending on the field of application, a high cleaning performance and / or a skincare effect are in the foreground with regard to the product requirement.
    In order to prevent microbial contamination, all cosmetic products must have adequate preservative according to the Standard Cosmetic Microbiology - Evaluation of Antimicrobial Protection of a Cosmetic Product (ISO 11930). Preservatives are usually added for this purpose, thereby ensuring, on the one hand, the durability and shelf life of the unopened product and, on the other hand, preventing the contamination of the package after it has opened. For the purposes of the present invention, the term "preservatives" is to be understood as meaning those substances which are described in Annex VI of the EU Cosmetics Regulation (76/768 / EEC), Stand 03. September 2014 are defined as such.
    Preservatives are antimicrobial biocides that inhibit or inhibit the growth of microorganisms such as bacteria, fungi and yeasts. However, this can also have a negative effect on the skin flora and manifest itself in an increased occurrence of skin irritations and redness, allergies and eczema. Therefore, particularly with damaged or sensitive skin such as that of babies, the addition of preservatives to cosmetic and medical products is to be viewed critically. It is uncertain in this context whether and in what amount such active substances are taken up via the skin. Toxicology data needs to be considered inadequate in many cases. Thus, some animal studies suggest that parabens may affect the hormone system over a longer useful life. Phenoxyethanol, a commonly used preservative, may be liver damaging.
    Therefore, it is necessary to find compatible and effective alternatives to preservatives. Zinc oxide has long been used in medicine as a drug in skin care and wound care products because of its antiseptic and anti-inflammatory properties. It offers zinc oxide ointments, patches or dressings suitable for superficial application to skin redness, rashes and inflammation (e.g., diaper dermatitis) and mild burns. Zinc is a trace element essential to the human body, which significantly affects the immune system and the functioning of many of the body's own enzymes. Therefore, zinc-containing products have high biocompatibility.
    The state of the art in the production of wet wipes utilizes both the skin care and healing properties of zinc oxide and its antimicrobial properties by treating different, for example cellulosic, nonwoven substrates with zinc oxide-containing emulsions or other impregnation solutions. This is described inter alia in US20060171971 (A1) and in WO9959540 (A1). The cited patents also refer to the option of adding preservatives to the liquid formulations. Obviously, in the applications described in these documents, the zinc oxide has only a nourishing and healing, but no preserving effect.
    A major disadvantage of these products is that sometimes high levels of auxiliary chemicals, such as surfactants or thickening agents for adjusting the viscosity, must be added to the drench fluids to prevent unwanted settling of the zinc oxide particles during the manufacturing process and storage of the products due to the high specific gravity of the ZnO Particles would occur.
    The incorporation of zinc oxide into polyolefin compositions for the production of nonwovens by the melt spinning method and the use of such antimicrobial products in the medical and hygiene field, for example as wet wipes, are claimed in JP2006249615 (A). However, such nonwovens, due to the hydrophobic character of the polyolefins, have low absorbency and low absorbency for aqueous liquids, and therefore are only very suitable as wet wipes in combination with hydrous formulations. In addition, unlike nonwoven cellulosic fibers, these nonwovens are not biodegradable.
    Also, because of their hydrophilicity, which is due to the ability of cellulose to form strong hydrogen bonds with water molecules, and the high aqueous liquid absorption power associated therewith, cellulosic fibers are preferable to manmade fibers such as polyester or polypropylene in the preparation of wet wipes. In addition to pulp, cellulosic synthetic fibers, so-called regenerated cellulose fibers, such as viscose or lyocell fibers, are used. The latter are superior to natural cellulose fibers in terms of uniformity, purity (e.g., pesticide residues), softness and wicking properties in a wide range. In particular, lyocell fibers are characterized by high dry and, above all, wet strength compared to other cellulosic fibers and enable the production of high-strength soft end products.
    Everyday articles comprising zinc oxide containing lyocell fibers and also having antimicrobial or skin-friendly and healing properties are known, for example, from DE202010010803 (U1) in the form of sensitive lingerie or DE202012011814 (U1) in the form of a baby or infant care mitt for neonates and infants the latter is also preferably made in the form of a textile.
    Overall, therefore, numerous possibilities are mentioned in the literature to prepare cellulosic, zinc oxide-containing wet wipes with wound-healing, skin care or antimicrobial action. These methods, however, are generally limited to impregnation methods characterized in that the backing materials in the form of nonwovens are loaded with zinc oxide-containing liquid formulations. Preservatives are often added to these impregnating liquids to ensure shelf life and other excipients, such as surfactants, to prevent settling of the zinc oxide particles in the production and storage. However, the use of chemical additives, and in particular preservatives, is undesirable in terms of consumer protection and consumer health.
    Webs having antimicrobial properties made from zinc oxide-containing lyocell spun masses by the meltblown process are described in WO0200006206 (A1). WO2012034679 (A1) claims spunbonded webs prepared by known spunbonding processes from metal oxide doped cellulosic solutions using N-methylmorpholine N-oxide as a direct solvent. In both patents, the use of such nonwoven fabrics in the hygienic field is considered, but not as wet wipes in particular. In addition, the nonwoven fabrics mentioned are not only subject to limitations in their manufacturing processes. Thus, the hemicellulose content of the webs described in WO 02009006206 (A1) is 4 to 18%; in WO2012034679 (A1), the additive content in the fiber is set to greater than 40% by weight. In both cases, therefore, the textile mechanical properties of the fibers are greatly reduced. Among other things, these fibers show a low tensile strength.
    Also disclosed are zinc pigment-containing lyocell fibers in EP 2334853 B1. There is described a specific form of such fibers in which the zinc is at least partially present as zincate. It is known to those skilled in the art that zincate can only be present in an alkaline environment. These fibers are said to have, inter alia, an antibacterial effect, which is achieved in particular by the fact that zinc sulfide is still present in the pigment in addition to zinc oxide. The ostensible objective of this fiber is to retain these properties even after several washes. Since the wet wipes, for example baby wipes, containing lotions always have an acidic pH, zincate will not occur in such applications. The pH of human skin is mostly around pH 5.5, with the lotions in wipes usually being slightly more acidic to not adversely affect the skin. WO 2004081267 A1 discloses in the local example V specifically the preparation of a ZnO-containing lyocell fiber having a specific UV absorption capacity. Specific uses of this fiber are not mentioned in WO2004081267 A1; however, it can be concluded from the description that WO 2004081267 A1 has as its object the production of UV-absorbing fibers.
    task
    The object was, compared to the described prior art, to provide a nonwoven which, when used in wet processing products, does not provide an additional preservative. only a much lower content of preservatives than hitherto required, in particular in order to prevent microbial contamination in the production, storage and removal of these moist products from the packaging and to minimize the contact of consumers with such preservatives. However, in addition to the above-mentioned functionality, this nonwoven fabric should continue to have optimum properties with respect to wet strength, moisture absorption, etc.
    Description of the invention
    The solution of the above-described object is to provide a nonwoven fabric containing cellulosic fibers wherein the cellulosic fibers contain at least partially incorporated zinc oxide particles and the nonwoven fabric is additionally impregnated with a liquid. The zinc oxide-containing cellulose fibers are, according to the invention, cellulosic synthetic fibers, e.g. by the viscose, modal or lyocell method, which are basically known to the person skilled in the art. The incorporation of solids into such fibers is also generally known to those skilled in the art, for example from WO 2011/026159 for viscose spinning solutions or from WO 2007/022552 for lyocell spinning solutions. Among other advantages, the nonwoven fabric of the present invention also has anti-allergenic properties due to the enzyme-deactivating properties of ZnO as well as the adsorption of allergenic substances. A surprising further advantage of the present invention is that these properties are achieved here with substantially lower ZnO contents than is possible in the prior art (see also the examples described below and Table 2).
    Preferred is a nonwoven fabric wherein the liquid has a pH less than 7. Particularly preferred is a nonwoven fabric in which the liquid has a pH between 3 and 6, preferably between 4.5 and 5.5. This is achieved by soaking the nonwoven fabric with an acidic liquid of appropriate pH. A preferred embodiment of the present invention is therefore a nonwoven fabric in which the liquid contains an organic or inorganic acid which forms a soluble zinc salt. For the purposes of this invention, a soluble zinc salt is understood to mean a zinc salt having a solubility of greater than 50 ppm In 18 MOhm water at 25 ° C and an air pressure of 1013 hPa. By "18 MOhm water" is generally understood an ion exchanger or otherwise known method deionized water having a conductivity of at most 18 MOhm.
    This acid should already be widely used in cosmetics. Preferably, this acid is selected from the group consisting of formic acid, acetic acid, lactic acid, citric acid, gluconic acid, glutamic acid, succinic acid, hydrochloric acid and sulfuric acid, and the soluble zinc salt is preferably selected from the group consisting of zinc formate, zinc acetate, zinc lactate, zinc citrate, zinc gluconate, zinc glutamate, zinc succinate, Zinc chloride and zinc sulfate.
    The zinc oxide-incorporated cellulose fibers in the nonwoven fabric according to the invention contain between 0.1 and 10 wt .-% zinc oxide, preferably between 0.3 and 4.5 wt .-% zinc oxide, particularly preferably between 0.3 and 3.5 wt .-% zinc oxide, based on absolutely dry cellulose. Also, up to 17% by weight of zinc oxide is possible, but will not be used frequently due to economic considerations.
    The nonwoven fabric of the present invention may contain, besides the zinc oxide-incorporated cellulose fibers, also zinc oxide-free cellulose fibers. In addition to the cellulosic synthetic fibers made e.g. by the viscose, modal or lyocell method, natural cellulose fibers such as cotton wool, hemp, etc. in question.
    The nonwoven fabric of the present invention may contain, in addition to the zinc oxide-incorporated cellulose fibers, synthetic fibers. For this principle, all known synthetic fibers come into question. Particularly suitable are polyethylene terephthalate and polypropylene.
    In the nonwoven fabric of the invention, the cellulosic fibers are either staple fibers or continuous filament fibers. Nonwoven fabrics produced by the meltblown process (see, for example, EP 1093536 B1) can also be counted for the nonwoven fabrics of endless filament fibers.
    The nonwoven fabric according to the invention has a fiber roughness of 8.5 N or higher, measured with the slag test described in the examples. It has been found that higher fiber roughness results in a better cleaning effect, among others, by increasing the cleaning surface of the wet wipe.
    The present invention also provides a process for making a nonwoven fabric by conventional nonwoven production processes in which cellulosic fibers containing incorporated zinc oxide are used for web formation and the nonwoven fabric is impregnated with a liquid. Nonwoven web forming techniques include mechanical web formation, hydrodynamic web formation, aerodynamic web formation, and meltblowing; As the nonwoven bonding process, hydroentanglement, needling, thermal strengthening and chemical strengthening are particularly suitable.
    A further object of the present invention is the use of a nonwoven fabric containing zinc oxide-incorporated cellulose fibers and impregnated with a liquid for the production of wet wipes, especially as baby wipes, make-up wipes, cleansing wipes, etc.
    Particularly preferred is a use according to the invention, wherein the wet wipes do not contain any additional preservatives. By "preservatives" is meant here the substances listed in AnnexVI of the EU Cosmetics Regulation (76/768 / EEC), as of 03. September 2014.
    Thus, the present invention also encompasses wet wipes containing the above-described nonwoven fabric of the present invention and thus not requiring any such additional preservatives.
    Improved detergency also occurs by adsorption of anionic soil (e.g., faeces, organic acids, etc.) to ZnO at the surface and in the fiber cross-section.
    In the following the invention will be described by way of examples. However, the invention is expressly not limited to these examples, but includes all other embodiments based on the same inventive concept.
    Examples
    Production of wet wipes:
    Lyocell fibers were first prepared in accordance with the Lyocell method known in the art, into which were spun 0.0, 2, 3.0 and 16.7 wt% (based on bare fiber) of ZnO to form a spinning composition after the lyocell process containing 13 wt% cellulose and the above ZnO amount (based on cellulose). This was then spun according to the lyocell process (single fiber titer 2.5 dtex, cut length 38 mm), provided with a lubricant which has no glue-preserving or biocidal properties and then dried. From the fibers thus produced needle needles (basis weight 60 g / m 2, 300 Punctures / cm 2), which were then hydroentangled and then dried (on a Fleissner system with the following settings: 35 bar water pressure, 1 nozzle bar with 2 rows of nozzles, VE water: pH 7.6, throughput speed of the web 2 m / min, 100 μm hole diameter the water jet nozzles, 118 ° CTrocknungstemperatur). The nonwovens produced in this way were coated with 290 wt%
    Lotion (based on the dry weight of the fleece) soaked to receive appropriate baby wipes. The exact composition of the lotion is given in Table 1. The pH of the lotion was adjusted to pH 3.00 after 48 hours of contact with the nonwoven fabrics.
    Table 1:
    Test for adequate preservation according to ISO 11930:
    Per 100 wipes consisting of 0.0, 1.2 or 16.7 wt% ZnO fibers of 15x10 cm size were soaked with lotion (290 wt% lotion on dry weight non-woven, composition according to Table 1) and the tests for sufficient preservation carried out. For this purpose, the wipes were inoculated with an inoculum which contained in the cosmetics usual germs in a defined concentration (S.aureus: 7.40E + 05 CFU, P. aeruginosa: 2.80E + 05 CFU, E. coli: 4.40E + 05KBE; C. albican: 6.90E + 05 CFU, A. brasiliensis: 1.70E + 05 CFU). After seeding, the wipes were stored for 28 days. After a period of observation of 7.14 and 28 days, respectively, the microbial count on the wet wipes was determined (see Table 2) in order to be able to determine a germ reduction.
    The tests according to ISO 11930 showed that preservation was successful with respect to the usual germs for the wipes with 1.2 and 16.7 wt% ZnO on atro fiber, since a sufficient germ reduction was achieved. The higher amount of ZnO clearly showed a better effect (criterion A according to DIN ΕΝ 11930) than the lower ZnO concentration (criterion B according to DIN EN 11930).
    Sliding test according to EN 1202 PPS:
    The softness of the fibers was determined with the sled test described in EN1202 PPS. The essential conditions of this test are: 5 g of fiber sample are carded twice, for example on a UsterMTDA-3 rotor ring device. The fibers are conditioned according to the EDANA protocol (ERT 60.2-99) for at least 24 hours and then cut by means of a template. The material is then placed in the tester and a carriage carrying a weight of 2000 g is mounted and placed on the sample. The test is started and after 10 seconds the force necessary to pull the carriage over the pattern is measured. The softer the fiber surface, the less force is needed to pull the slide forward. The text was repeated on each material four times. The results are shown in Table 3.
    Table 2:
    12
    Table 3:
    权利要求:
    Claims (13)
    [1]
    Claims 1. A nonwoven fabric containing cellulosic fibers, characterized in that the cellulosic fibers at least partially contain incorporated zinc oxide particles and that the nonwoven fabric is additionally impregnated with a liquid.
    [2]
    The nonwoven fabric of claim 1, wherein the liquid has a pH less than 7.
    [3]
    3. Nonwoven fabric according to claim 2, wherein the liquid has a pH between 3 and 6, preferably between 4.0 and 5.5.
    [4]
    A nonwoven fabric according to claim 2, wherein the liquid contains an organic or inorganic acid which forms zinc salts having a solubility of more than 50 ppm in 18 MOhm water at 25 ° C and an air pressure of 1013 hPa.
    [5]
    The nonwoven fabric according to claim 1, wherein the zinc oxide-incorporated cellulose fibers contain between 0.1 and 10% by weight of zinc oxide, preferably between 0.3 and 4.5% by weight of zinc oxide, more preferably between 0.3 and 3.5% by weight. % Zinc oxide, based on absolutely dry cellulose.
    [6]
    A nonwoven fabric according to claim 1, wherein the zinc oxide particles are coated with a synthetically produced polymer, especially a polyacrylate.
    [7]
    A nonwoven fabric according to claim 1, which also contains zinc oxide-free cellulose fibers in addition to the zinc oxide-incorporated cellulose fibers.
    [8]
    A nonwoven fabric according to claim 1, which also contains synthetic fibers in addition to the zinc oxide-incorporated cellulose fibers.
    [9]
    The nonwoven fabric of claim 1 wherein the cellulosic fibers are either staple fibers or continuous filament fibers
    [10]
    A nonwoven fabric according to claim 1 which has a fiber-to-fiber friction of 8.5N or higher as measured by the sizing test.
    [11]
    A process for the production of a nonwoven fabric by means of conventional nonwoven production processes, characterized in that for nonwoven formation cellulose fibers containing incorporated zinc oxide are used and that the nonwoven fabric is impregnated with a liquid.
    [12]
    Use of a nonwoven fabric containing zinc oxide-incorporated cellulose fibers and impregnated with a liquid for making wet wipes.
    [13]
    Use according to claim 12, wherein the wet wipes contain no additional preservatives.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA790/2014A|AT516414B1|2014-10-28|2014-10-28|Liquid-soaked non-woven fabric containing zinc oxide-containing cellulose fibers|ATA790/2014A| AT516414B1|2014-10-28|2014-10-28|Liquid-soaked non-woven fabric containing zinc oxide-containing cellulose fibers|
    US15/518,686| US10456340B2|2014-10-28|2015-05-12|Liquid-impregnated nonwoven fabric which contains zinc oxide-containing cellulose fibers|
    JP2017522527A| JP6539734B2|2014-10-28|2015-05-12|Liquid-impregnated nonwoven comprising zinc oxide-containing cellulose fibers, method of producing the nonwoven, and use of the nonwoven for producing the wet wipe|
    KR1020177014168A| KR102302656B1|2014-10-28|2015-05-12|Liquid-impregnated nonwoven fabric which contains zinc oxide-containing cellulose fibers|
    PCT/AT2015/000073| WO2016065376A1|2014-10-28|2015-05-12|Liquid-impregnated nonwoven fabric which contains zinc oxide-containing cellulose fibers|
    CN201580057309.7A| CN107075760B|2014-10-28|2015-05-12|Liquid impregnated nonwoven fabric containing zinc oxide containing cellulosic fibers|
    EP15730379.3A| EP3212825B1|2014-10-28|2015-05-12|Liquid-impregnated nonwoven fabric which contains zinc oxide-containing cellulose fibers|
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