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    • 专利摘要:
    The present invention relates to a use of a polyolefin-based composition for the production of a polyolefin-based molded product, said polyolefin-based composition comprising: - polyolefin; and a cycloolefin copolymer of ethylene and norbornene, wherein said norbornene constitutes 42 to 58 weight percent of said cycloolefin copolymer. In addition, the present invention relates to a polyolefin-based molded product that can be obtained thereby.
    公开号:BE1024763B1
    申请号:E20175368
    申请日:2017-05-19
    公开日:2018-06-21
    发明作者:Assia Ouchchen
    申请人:Plastic Science By Design Bvpa；
    IPC主号:
    专利说明:

    Priority date:
    International classification: C08L 23/10, C08L 23/08, C08K 3/34 Application number: BE2017 / 5368
    Date of submission: 19/05/2017
    Holder:
    PLASTIC SCIENCE BY DESIGN private limited liability company
    9160, LOKEREN
    Belgium
    Inventor:
    OUCHCHEN Assia 9160 LOKEREN Belgium
    Use of a polyolefin-based composition to produce a polyolefin-based flocked product and product obtainable thereby
    The present invention relates to a use of a polyolefin-based composition for the production of a polyolefin-based molded product, said polyolefin-based composition comprising: - polyolefin; and - cycloolefin copolymer of ethylene and norbornene, said norbornene constituting 42 to 58 weight percent of said cycloolefin copolymer. In addition, the present invention relates to a polyolefin-based molded product that can be obtained thereby.
    BELGIAN INVENTION PATENT
    FPS Economy, K.M.O., Self-employed & Energy
    Publication number: 1024763 Number of submission: BE2017 / 5368
    Intellectual Property Office
    International Classification: C08L 23/10 C08L 23/08 C08K 3/34 Date of Issue: 21/06/2018
    The Minister of Economy,
    Having regard to the Paris Convention of 20 March 1883 for the Protection of Industrial Property;
    Having regard to the Law of March 28, 1984 on inventive patents, Article 22, for patent applications filed before September 22, 2014;
    Having regard to Title 1 Invention Patents of Book XI of the Economic Law Code, Article XI.24, for patent applications filed from September 22, 2014;
    Having regard to the Royal Decree of 2 December 1986 on the filing, granting and maintenance of inventive patents, Article 28;
    Having regard to the application for an invention patent received by the Intellectual Property Office on 19/05/2017.
    Whereas for patent applications that fall within the scope of Title 1, Book XI, of the Code of Economic Law (hereinafter WER), in accordance with Article XI.19, § 4, second paragraph, of the WER, the granted patent will be limited. to the patent claims for which the novelty search report was prepared, when the patent application is the subject of a novelty search report indicating a lack of unity of invention as referred to in paragraph 1, and when the applicant does not limit his filing and does not file a divisional application in accordance with the search report.
    Decision:
    Article 1
    PLASTIC SCIENCE BY DESIGN private limited liability company, Hazewinkelstraat 10, 9160 LOKEREN Belgium;
    represented by
    CRABBE Ellen, Pauline van Pottelsberghelaan 24, 9051, GHENT;
    BRANTS Johan Philippe Emile, Pauline Van Pottelsberghelaan 24, 9051, GHENT;
    VAN CAUTEREN Tim, Pauline Van Pottelsberghelaan 24, 9051, GHENT;
    a Belgian invention patent with a term of 20 years, subject to payment of the annual fees as referred to in Article XI.48, § 1 of the Code of Economic Law, for: Use of a polyolefin-based composition for the production of a polyolefin based product and product that can be obtained thereby.
    INVENTOR (S):
    OUCHEN Assia, Hazewinkelstraat 10, 9160, LOKEREN;
    PRIORITY:
    BREAKDOWN:
    Split from basic application: Filing date of the basic application:
    Article 2. - This patent is granted without prior investigation into the patentability of the invention, without warranty of the Merit of the invention, nor of the accuracy of its description and at the risk of the applicant (s).
    Brussels, 21/06/2018,
    With special authorization:
    BE2017 / 5368
    USE OF A POLYOLEFINE BASED COMPOSITION FOR
    THE PRODUCTION OF A POLYOLEFINE BASED FORM
    PRODUCT AND PRODUCT THAT MAY BE OBTAINED
    TECHNICAL AREA
    The invention relates to a use of a polyolefin-based composition for the production of a polyolefin-based molded product and to a product obtained thereby.
    BACKGROUND
    Polystyrene is known as a packaging material for containing food, e.g. dairy products such as yogurt. This use of polystyrene is related to its properties to impart rigidity to packaging materials and that the packaging materials exhibit a small amount of shrinkage. End consumers complain about the phenomenon of migration of styrene monomer in drinks and foods that are packed with such polystyrene packaging material, as this migration results in a differentiation of the taste of the food.
    To avoid this phenomenon, multilayer structures can be made in which polystyrene is combined with ethylene vinyl alcohol and polyethylene. Some products do not require the high functionality with regard to such multi-layer structures. For such products, the multi-layered structures can be considered an ineffective use of resources.
    Polyolefin-based materials can be proposed as an alternative to said polystyrene packaging material. For example, polypropylene has better barrier properties, better resistance to higher temperatures, can be better purified, recycled and processed, and is also cheaper than polystyrene. A cycloolefin copolymer of ethylene and norbornene may be included to take advantage of the high rigidity.
    A composition comprising polypropylene and cycloolefin copolymer of ethylene and norbornene is described in U.S. Patent No. 2008/0287614 A1. The cycloolefin copolymer includes an amorphous random
    BE2017 / 5368 copolymer of ethylene and norbornene, the cycloolefin copolymer comprising at least about 60 wt% norbornene. Due to the high norbornene content of the cycloolefin copolymer, the glass transition temperature of the cycloolefin copolymer is relatively high. In preferred embodiments, the norbornene content ranges from about 60 wt% to about 85 wt% and the glass transition temperature ranges correspondingly from about 55 ° C to about 170 ° C. Thus, the cycloolefin copolymer is glassy at room temperature and remains glassy at temperatures significantly higher than room temperature. The glass transition temperature of the cycloolefin copolymer is significantly higher than that of the polypropylene in the composition.
    The composition according to US 2008/0287614 A1 is intended to improve the melt strength of polypropylene by mixing the cycloolefin copolymer into the polypropylene to broaden the acceptable processing temperature range for the polypropylene. However, such a polypropylene composition may give rise to insufficient crystallization properties for certain thermoforming or extrusion applications, leading to phenomena of curls, e.g., gutter-like curls.
    The present invention aims to solve at least some of the aforementioned Problems.
    SUMMARY OF THE INVENTION
    To this end, a first aspect of the present invention provides a use of a polyolefin-based composition for the production of a polyolefin-based molded product, according to claim 1. Said polyolefin-based composition includes, in particular:
    polyolefin; and
    cycloolefin copolymer of ethylene and norbornene, said norbornene constituting 42 to 58 weight percent of said cycloolefin copolymer.
    The said polyolefin-based composition gives rise to molded products produced therefrom with excellent rigidity properties. The said excellent stiffness properties can be observed in molded products resulting from thermal
    BE2017 / 5368, e.g. thermoforms of the said composition. At the same time, phenomena of curls, e.g., gutter-like curls, or other unwanted product deformations are negligible in thermoforming, e.g., thermoforming, of said composition. In addition, production times of such rigid polyolefin-based molded products are acceptable. Accordingly, said use of said polyolefin-based composition for the production of a polyolefin-based molded product facilitates the production of a highly desirable monolayer polyolefin alternative for single and / or multilayer polystyrene packaging products currently used in the food industry.
    In a second aspect, the present invention provides a polyolefin based molded product obtainable according to a use according to the first aspect of the present invention according to claim 17.
    DETAILED DESCRIPTION OF THE INVENTION
    Claiming numerical ranges by endpoints includes all numbers and fractions included within that range, as well as the named endpoints.
    As used herein, the term polyolefin refers to any polymerized olefin, which can be linear, branched, cyclic, aliphatic, aromatic, substituted, or unsubstituted. More specifically, the term polyolefin includes homopolymers of olefins, copolymers of olefins, copolymers of an olefin, and a non-olefinic comonomer that can be copolymerized with the olefin, such as vinyl monomers, modified polymers thereof, and the like. Specific examples include polypropylene homopolymers, polyethylene homopolymers, polybutene, propylene / alpha olefin copolymers, ethylene / alpha olefin copolymers, butene / alpha olefin copolymers, ethylene / ethyl acrylate copolymer, ethylene / methyl acrylic copolymer, ethylene / methacryl copolymer, ethylene / methacryl copolymer, ethylene / methacryl copolymer, ethylene / methacryl copolymer polyolefin resins, ionomer resins, polymethylpentene, etc. The modified polyolefin resins include modified polymers prepared by copolymerizing the homopolymer of the olefin or copolymer thereof with an unsaturated carboxylic acid, e.g. maleic acid, fumaric acid or the like, or a derivative thereof
    BE2017 / 5368 such as the anhydride, the ester or metal salt or the like. It could also be obtained by incorporating in the olefin homopolymer or copolymer an unsaturated carboxylic acid, e.g. maleic acid, fumaric acid or the like, or a derivative thereof such as the anhydride, the ester or metal salt or the like.
    In the present text, the term "polypropylene" is intended to mean a polymer selected from the group consisting of polypropylene homopolymer, polypropylene copolymer (random, block or grafted), polypropylene terpolymer, polyopropylene interpolymer (comprising one or more comonomers), a polypropylene with ethylene containing blocks, a polypropylene with ethylene-containing blocks comprising polyethylene, or any combination thereof. Other ethylene-containing blocks can include ethylene-propylene rubber. For said polypropylene with ethylene containing blocks comprising polyethylene, the polyethylene may be selected from polyethylene homopolymer, polyethylene copolymer, polyethylene terpolymer and polyethylene interpolymers consisting of one or more additional comonomers with alpha substituted olefins and unsaturated olefin monomer, low molecular weight olefin oligomers, waxes and elastomers copolymers thereof. The blocks may also include branches of short chain ethylene or alpha olefin and substituted olefin molecules, including unsaturations. These examples are illustrative only and not limiting. Any other type of polypropylene suitable for the present invention, as known in the art, can be selected.
    The term "cycloolefin copolymer of ethylene and norbornene" refers to a copolymer based on the copolymerization of ethylene with norbornene.
    As used herein, the term "molded product" is used to refer to products obtained by known thermoforming methods such as extrusion blow molding, injection molding, blow molding, blow molding, extrusion blow molding, injection blow molding, compression molding, vacuum molding, calander, expansion molding and thermoforming, or any combination thereof. Such shaped product can be produced in very different shapes and product types. Non-limitative examples of types of molded products include sheets, foils and containers. Non-limitative examples of types of molded products suitable for containing food and / or beverage products include
    BE2017 / 5368 barrels, dishes, pots, containers and cups for food and / or beverage packaging.
    In the present text, the term "breaking ability" refers to the ability of products, especially of polyolefin-based molded products derived from a polyolefin-based composition to follow the present invention to intentionally snap or break under flexural deformation. Breaking ability is usually facilitated on molded products, such as containers, by using pre-cutting steps. Pre-cutting steps include implementing a mechanical trimming tool that touches and penetrates a plastic layer with a controlled pre-cutting depth. However, the implementation of such pre-cutting steps does not guarantee desired breaking power. A material that is too brittle will lead to cracks that occur at the edges when flexing a product from such a material. In addition, it may prove advantageous that a product can be broken into various clean-edged parts with negligible tears or other irregularities, without even using such pre-cutting steps.
    As used herein, the term "silicate mineral" includes silicon, silicates, zeolites or a combination thereof. Silicon may include precipitated silicon, amorphous smoked silicon, fused silicon, silicon gel and / or mixture requirement thereof. Silicates can include the compounds including silicon, oxygen and one or more metals with or without hydrogen. Both synthetic and naturally occurring silicates can be used in one or more embodiments. Examples of naturally occurring silicates include gemstones, berly, asbestos, talc, clay, feldspar, mica and their mixture requirement. An example of a synthetic silicate includes sodium silicate. Examples of silicates include tetracaluminum aluminoferrate, tricalcium silicate, dicalcium silicate, calcium metasilicate and mixed requirement thereof. Other useful silicates include hydrated aluminum silicates, which are also referred to as clay. Examples of clay include kaolinite, montmorillonite, atapulgite, illite, bentonite, halloysite, and mixture requirement thereof. Still other useful silicates include hydrated magnesium silicates called talc. Examples of talc include talcum, soapstone, steatite, kerolite, magnesium talc, steatite solid and mixture requirement thereof. Examples of zeolites include some of the naturally occurring or synthetic zeolites. Examples of these zeolites include large pore zeolites, medium pore zeolites and small pore zeolites.
    BE2017 / 5368
    In a first aspect, the present invention provides a use of a polyolefin-based composition for the production of a polyolefin-based molded product, said polyolefin-based composition comprising:
    polyolefin; and cycloolefin copolymer of ethylene and norbornene, wherein said norbornene is 42 to 58, preferably 45 to 55, more preferably 48 to 52 weight percent of said cycloolefin copolymer.
    The said polyolefin-based composition gives rise to molded products produced therefrom with excellent rigidity properties. The said excellent stiffness properties can be observed in molded products resulting from thermoforming, e.g. thermoforming of said composition. At the same time, phenomena of curls, e.g., gutter-like curls, or other unwanted product deformations are negligible in thermoforming, e.g., thermoforming, of said composition. In addition, production times of such rigid polyolefin-based molded products are acceptable. Accordingly, said use of said polyolefin-based composition for the production of a polyolefin-based molded product facilitates the production of a highly desirable monolayer polyolefin alternative to single and / or multilayer polystyrene packaging products currently used in the food industry.
    In addition, molded products produced from said polyolefin-based composition, such as molded products resulting from thermoforming, e.g., thermoforming of said polyolefin-based composition, exhibit excellent breaking ability. This is especially important for packaging products that are provided in a clustered form, such as, for example, multipack containers for containing yogurt.
    It should be possible for a person skilled in the art to acquire the components of the cycloolefin copolymer of the present invention, and thus obtain the said specific copolymer and then the polyolefin
    BE2017 / 5368 based composition to be used in the use according to obtain the first aspect of the present invention.
    In a preferred embodiment, the present invention provides use according to the first aspect of the invention, wherein said polyolefin constitutes 60 to 97 weight percent of the composition, and said cycloolefin copolymer of ethylene and norbornene 3 to 15, more preferably 5 up to 15 and even more preferably 10 to 15 weight percent of the composition.
    It has been found that said amounts of said polyolefin and said cycloolefin copolymer of ethylene and norbornene in the polyolefin-based composition are ideally suited to achieve very excellent stiffness properties in molded products produced therefrom, such as molded products which result from thermoforming, e.g. thermoforming, of the composition. In addition, it has been found that the stated amounts lead to very excellent breaking ability in the resulting molded products.
    In a preferred embodiment, the present invention provides a use according to the first aspect of the invention, further comprising a heat absorbing composition comprising polyolefin and silicate mineral.
    Said heat absorbing composition improves the processability of the polyolefin based composition according to the present invention. Inclusion of the heat absorbing composition results in reduced production times in the production of a molded product from said composition, especially in thermoforming said composition into a molded product. The said composition comprising the heat absorbing composition also leads to reduced production times in thermoforming the said composition into a molded product.
    Silicate mineral, as defined above, is a material that absorbs heat. It absorbs heat in thermoforming, e.g. thermoforming, a polyolefin-based composition according to the first aspect of the invention, allowing faster processing of said composition into desired polyolefin-based molded products. There is in it
    BE2017 / 5368 have particularly found that the heat absorbing composition comprising silicate mineral absorbs heat during heat contact steps in the initial phases of a thermoforming process. When said polyolefin and said cycloolefin copolymer are subsequently heated during the thermoforming process, polyolefin will slowly transition to a viscoelastic state while cycloolefin copolymer, in the presence of the heat absorbing composition, will go into the thermoformed phase more rapidly and will transmit heat to the polyolefin since the cycloolefin polymer molecules are given some additional freedom of movement. In addition, the heat-absorbing composition in the general will absorb heat and will be saturated more quickly with said heat, which in turn will be rapidly released to the polyolefin, resulting in faster viscoelastic flow properties desired for thermoforming.
    In a preferred embodiment, the present invention provides a use according to the first aspect of the invention, wherein said silicate mineral is 0.1 to 30, more particularly 1 to 25, even more particularly 2 to 20, even more preferably 5 to 18 weight percent of said heat absorbing composition. Said amounts of said silicate mineral are optimally suitable for providing the heat absorbing composition with a desired heat absorbing functionality.
    In a preferred embodiment, the present invention provides a use according to the first aspect of the invention, wherein said heat absorbing composition is 0.1 to 20, more particularly 1 to 16, even more particularly 2 to 14, even more preferably 3 to 12, and even more preferably 5 to 10% by weight of said composition. The heat absorbing composition, which is included in the composition in the aforementioned amounts, most effectively improves the processability of the polyolefin-based composition of the present invention.
    In a preferred embodiment, the present invention provides a use according to the first aspect of the invention, wherein said polyolefin is polypropylene. Polypropylene is particularly suitable in the context of the present invention, in view of the excellent barrier9
    BE2017 / 5368 properties, temperature resistance, purity, recyclability, processability and its low cost.
    In a preferred embodiment, the present invention provides a use according to the first aspect of the present invention, wherein said composition further comprises one or more additives selected from the group comprising oxidative and thermal stabilizers, lubricants, non-adhesives, flame retardants, oxidation inhibitors, oxidation scavengers , dyes, pigments and other dyes, ultraviolet light absorbers and stabilizers, organic and inorganic fillers, including particulate and fibrous fillers, firming agents, nucleators, plasticizers or any combination thereof. Representative ultraviolet light stabilizers comprising various substituted resorcinols, salicylates, benzotriazoles, benzophenones and the like. Suitable lubricants and non-adhesives include wax, stearic acid, stearyl alcohol and stearamides. Examples of flame retardants include organic halogenated compounds, including decabromodiphenyl ether and the like, as well as inorganic compounds. Suitable dyes include dyes and pigments including cadmium sulfide, cadmium selenide, titanium dioxide, phthalocyanines, ultramarine blue, nigrosine, carbon black and the like. Representative oxidative and thermal stabilizers including the Group I metal halides of the Periodic Table of the Elements, such as sodium halides, potassium halides, lithium halides; as well as copper halides; and further, chlorides, bromides, iodides. Also acceptable are hindered phenols, hydroquinones, aromatic amines as well as substituted members of the above groups and combinations thereof. Examples of plasticizers include lactams such as caprolactam, and lauryllactam, sulfonamides such as o, p-toluenesulfonamide and N-ethyl, N-butyl benylene sulfonamide, and combinations of any of the above, as well as other plasticizers well known in the art. In embodiments, said one or more additives may be selected to refine the properties of said polyolefin-based composition.
    In a preferred embodiment, the present invention provides a use according to the first aspect of the invention, wherein, in thermoforming, e.g. thermoforming, the said composition, the shrinkage ratio of the
    BE2017 / 5368 composition is maximum 3%, more preferably maximum 2% and even more preferably maximum 1.2%, as measured by ASTM D955.
    Said shrink ratio is much smaller than a raw polypropylene shrink ratio measured by ASTM D955, which may be between 15 and 30%. This low shrink ratio provides stable conditions in thermoforming, e.g. thermoforming, of the said polyolefin-based composition.
    In a preferred embodiment, the present invention provides a use according to the first aspect of the present invention, wherein said polyolefin-based molded product is a container suitable for containing food and / or beverage products, and in particular a container for containing dairy products, or is an intermediate layer intended for the production of such a container. Such an intermediate layer and container are products that take full advantage of the positive properties, including good breaking ability, of products produced using a polyolefin-based composition according to a first aspect of the invention.
    In a preferred embodiment, the present invention provides a use according to the first aspect of the present invention, wherein said polyolefin-based molded product is suitable for non-food applications. Non-limiting examples of non-food applications include the storage of cosmetics and pharmaceuticals, detergent or detergent and dry products.
    In a preferred embodiment, the present invention provides a use according to the first aspect of the present invention, wherein the production of said polyolefin-based molded product comprises the following steps:
    heating said polyolefin-based composition to various increasing temperature levels in a first heating step;
    heating said polyolefin-based composition to various increasing temperature levels in a second heating step; and
    BE2017 / 5368 molding said polyolefin-based composition into a specific shape into a mold, resulting in a polyolefin-based molded product.
    In a preferred embodiment, the present invention provides a use according to the first aspect of the present invention, wherein said first heating step corresponds to successively heating said composition at temperatures from 90 to 110 ° C, at temperatures from 110 to 125 ° C, at temperatures from 125 to 140 ° C and at temperatures from 130 to 145 ° C, and at a cycle rate of 16 to 30 cycles per minute. In a preferred embodiment, the present invention provides a use according to the first aspect of the present invention, wherein said second heating step corresponds to successively heating said composition at temperatures from 315 to 335 ° C and at temperatures from 335 to 355 ° C, and at a cycle rate of 11 to 25 cycles per minute.
    Production of said polyolefin-based molded product according to said steps results in a polyolefin-based molded product with excellent stiffness properties, negligible curl phenomena such as, e.g., gutter-like curls, or other undesirable product deformations, and acceptable lead times. A resulting polyolefin-based molded product can be used as a highly desirable single-layer polyolefin alternative to single and / or multi-layer polystyrene packaging products currently used in the food industry. In addition, resulting polyolefin-based molded products exhibit excellent breaking ability, which is, for example, very important for the packaging of products that are provided in a clustered form, such as, for example, multipack containers for containing yogurt. In addition, said heating and deforming steps result in a shrink ratio of the molded product of maximum 3%, more preferably maximum 2%, and even more preferably maximum 1.2%, as measured by ASTM D955. Said shrink ratio of the molded product produced is much smaller than a shrink ratio of raw polypropylene molded product measured by ASTM D955, which may be between 15 and 30%. This low shrink ratio provides stable production conditions in the production of a molded product.
    BE2017 / 5368
    In a preferred embodiment, the present invention provides a use according to the first aspect of the present invention, further comprising the step of trimming said polyolefin-based molded product. Accordingly, a trimmed polyolefin-based molded product is formed, which shape and size are refined for specific uses of the molded product. Non-limitative examples are containers that can be used for containing food and / or drinks, such as containers for packaging yogurt.
    In a preferred embodiment, the present invention provides a use according to the first aspect of the present invention, wherein said heating in said first heating step is performed by contact heating at said different increasing temperature levels.
    In a preferred embodiment, the present invention provides a use according to the first aspect of the present invention, wherein said heating in said second heating step is performed by radiant heating at said different increasing temperature levels.
    Said specific types of heating, i.e. contact heating and radiant heating, as well as their sequence in the production of a polyolefin-based molded product according to a use according to a first aspect of the present invention, contribute to the excellent breaking ability of such a product.
    In a second aspect, the present invention provides a polyolefin-based molded product obtainable according to a use according to the first aspect of the present invention. The specific features and properties of such a product can be understood from the above description.
    In a preferred embodiment, the present invention provides a polyolefin-based molded product according to the second aspect of the present invention, wherein said product is a container suitable for containing food and / or beverage products, and in particular a
    BE2017 / 5368 container for containing dairy products, or is an intermediate layer intended for the production of such a container. Such intermediate layer and container are products that take full advantage of the positive properties, including the good breaking ability, that polyolefin-based molded products of the present invention provide.
    In a preferred embodiment, the present invention provides a polyolefin-based molded product according to the second aspect of the present invention, said product being suitable for non-food applications. Non-limiting examples of non-food applications include the storage of cosmetics and pharmaceuticals, detergent or detergent and dry products.
    In another aspect, the present invention provides a polyolefin-based composition comprising:
    polyolefin; and
    cycloolefin copolymer of ethylene and norbornene, said norbornene being from 42 to 58, preferably 45 to 55, more preferably 48 to 52 weight percent of said cycloolefin copolymer.
    Said polyolefin-based composition gives rise to excellent stiffness properties in molten products resulting from thermoforming, e.g. thermoforming, of said composition. At the same time, phenomena of curls, e.g., gutter-like curls, or other undesired product deformations are negligible in the thermoforming, e.g., thermoforming, of said composition. In addition, production times of such rigid polyolefin-based molded products are acceptable. Accordingly, said polyolefin based composition of the present invention facilitates the production of a highly desirable single-layer polyolefin alternative to single and / or multi-layer polystyrene packaging products currently used in the food industry.
    In addition, molded products resulting from thermoforming, e.g. thermoforming, of said polyolefin-based composition, exhibit excellent breaking ability. This is especially important for packaging products that are provided in a clustered form, such as, for example, multipack containers for containing yogurt.
    BE2017 / 5368
    One skilled in the art should be able to acquire the components of the cycloolefin copolymer of the present invention, and thus obtain said specific copolymer, and then obtain the polyolefin-based composition of any aspect of the invention.
    In a preferred embodiment, the present invention provides a polyolefin-based composition according to an aspect of the invention, wherein said polyolefin constitutes 60 to 97 weight percent of the composition, and said cycloolefin copolymer of ethylene and norbornene 3 to 15, more at preferably 5 to 15 and more preferably 10 to 15 weight percent of the composition.
    It has been found that said amounts of said polyolefin and said cycloolefin copolymer of ethylene and norbornene in the polyolefin-based composition are ideally suited to achieve very excellent stiffness properties in molded products resulting from thermoforming, e.g. thermoforming, of the composition. In addition, it has been found that the stated amounts lead to a very excellent breaking capacity in the resulting molded products.
    In a preferred embodiment, the present invention provides a polyolefin-based composition according to an aspect of the invention, further comprising a heat absorbing composition comprising polyolefin and silicate mineral.
    Said heat absorbing composition improves the processability of the polyolefin-based composition of the present invention. Inclusion of the heat absorbing composition results in reduced production times in thermoforming said composition into a molded product. Said composition comprising the heat absorbing composition in particular leads to reduced production times in thermoforming said composition into a molded product.
    Silicate mineral, as defined above, is a material that absorbs heat. It absorbs heat during thermoforming, e.g. thermoforming,
    BE2017 / 5368 of a polyolefin-based composition further comprises an aspect of the invention, which allows for faster processing of said composition into desired polyolefin-based molded products. In particular, it has been found that the heat absorbing composition comprising silicate mineral absorbs heat during heat contact steps in the initial phases of a thermoforming process. When said polyolefin and said cycloolefin copolymer are subsequently heated during the thermoforming process, polyolefin will slowly transition to a viscoelastic status while cycloolefin copolymer, in the presence of the heat absorbing composition, will enter the thermoformed phase more rapidly and will transmit heat to the polyolefin since the cycloolefin polymer molecules are given a certain extra freedom of movement. In addition, the heat absorbing composition will generally absorb heat and will be saturated more quickly with said heat, which in turn will be rapidly released to the polyolefin, leading to faster obtaining viscoelastic flow properties desired for thermoforming.
    In a preferred embodiment, the present invention provides a polyolefin-based composition according to an aspect of the invention, wherein said silicate mineral is 0.1 to 30, more particularly 1 to 25, even more particularly 2 to 20, even more preferably 5 to 18 weight percent of said heat absorbing composition. Said amounts of said silicate mineral are optimally suitable for providing the heat absorbing composition with a desired heat absorbing functionality.
    In a preferred embodiment, the present invention provides a polyolefin-based composition according to an aspect of the invention, wherein said heat absorbing composition is 0.1 to 20, more particularly 1 to 16, even more particularly 2 to 14, still more preferably 3 to 12, and even more preferably 5 to 10 weight percent of said composition. The heat absorbing composition, which is included in the composition according to said amounts, most effectively improves the processability of the polyolefin based composition according to the present invention.
    BE2017 / 5368
    In a preferred embodiment, the present invention provides a polyolefin-based composition according to an aspect of the invention, wherein said polyolefin is polypropylene. Polypropylene is particularly suitable in the context of the present invention, in view of its excellent barrier properties, temperature resistance, purity, recyclability, processability and its low cost.
    In a preferred embodiment, the present invention provides a polyolefin-based composition according to an aspect of the present invention, wherein said composition further comprises one or more additives selected from the group comprising oxidative and thermal stabilizers, lubricants, non-adhesives, flame retardants, oxidation inhibitors oxidation scavengers, dyes, pigments and other colorants, ultraviolet light absorbers and stabilizers, organic and inorganic fillers, including particulate and fibrous fillers, firming agents, nucleators, plasticizers or any combination thereof. Representative ultraviolet light stabilizers comprising various substituted resorcinols, salicylates, benzotriazoles, benzophenones and the like. Suitable lubricants and non-adhesives include wax, stearic acid, stearyl alcohol and stearamides. Examples of flame retardants include organic halogenated compounds, including decabromodiphenyl ether and the like, as well as inorganic compounds. Suitable dyes including dyes and pigments include cadmium sulfide, cadmium selenide, titanium dioxide, phthalocyanines, ultramarine blue, nigrosine, carbon black and the like. Representative oxidative and thermal stabilizers including the Group I metal halides of the Periodic Table of the Elements, such as sodium halides, potassium halides, lithium halides; as well as copper halides; and further, chlorides, bromides, iodides. Also acceptable are hindered phenols, hydroquinones, aromatic amines as well as substituted members of the above groups and combinations thereof. Examples of plasticizers include lactams such as caprolactam, and lauryllactam, sulfonamides such as o, p-toluenesulfonamide and N-ethyl, N-butyl benylene sulfonamide, and combinations of any of the above, as well as other plasticizers well known in the art. In embodiments, said one or more additives may be selected to refine the properties of said polyolefin-based composition.
    BE2017 / 5368
    In a preferred embodiment, the present invention provides a polyolefin-based shear setting according to an aspect of the invention, wherein, in thermoforming, e.g. thermoforming, of the said setting, the shrinkage ratio of the setting is maximum 3%, more preferably maximum 2 % and even more preferably maximum 1.2%, as measured by ASTM D955.
    Said shrink ratio of the polyolefin-based reinforcement according to an aspect of the invention is much smaller than a shrink ratio of raw polypropylene measured by ASTM D955, which may be between 15 and 30%. This low shrinkage ratio provides stable conditions in thermoforming, e.g. thermoforming, of the said polyolefin-based supports.
    In another aspect, the present invention provides a method for the production of a polyolefin-based molded product, using a polyolefin-based assembly, further comprising an aspect of the present invention.
    As will become more apparent from the disclosure described above, a method for the production of a polyolefin-based molded product using a polyolefin-based resin according to an aspect of the present invention permits the production of polyolefin-based molded products with high stiffness, good breaking ability and negligible curl phenomena, which can be used as a highly desirable single-layer polyolefin alternative to single-layer and / or multi-layer polystyrene packaging products currently used in the food industry.
    In a preferred embodiment, the present invention provides a method for the production of a polyolefin-based molded product, using a polyolefin-based assembly, further comprising an aspect of the present invention, comprising the following steps:
    - heating said polyolefin-based resin to different increasing temperature levels in a first heating step;
    BE2017 / 5368
    - heating said polyolefin-based composition to different increasing temperature levels in a second heating step; and
    - molding said polyolefin-based composition into a specific shape in a mold, resulting in a polyolefin-based molded product.
    In a preferred embodiment, the present invention provides a method of producing a polyolefin-based molded product using a polyolefin-based composition according to an aspect of the present invention, wherein said first heating step corresponds to sequentially heating said composition at temperatures from 90 to 110 ° C, at temperatures from 110 to 125 ° C, at temperatures from 125 to 140 ° C and at temperatures from 130 to 145 ° C, and at a cycle rate of 16 to 30 cycles per minute. In a preferred embodiment, the present invention provides a method of producing a polyolefin-based molded product using a polyolefin-based composition according to an aspect of the present invention, wherein said second heating step corresponds to sequentially heating said composition up to temperatures from 315 to 335 ° C, at temperatures from 335 to 355 ° C, and at a cycle rate of 11 to 25 cycles per minute.
    Subjecting a polyolefin-based composition according to an aspect of the present invention to said steps of the method of producing a polyolefin-based molded product, using a polyolefin-based composition according to an aspect of the present invention, results in a polyolefin-based molded product with excellent stiffness properties, negligible curl phenomena, such as, for example, gutter curl, or other undesired product deformation, and acceptable lead times. Accordingly, said process allows the production of a polyolefin-based molded product which can be used as a desired single-layer polyolefin alternative for one and / or multi-layer polystyrene packaging products currently used in the food industry. In addition, the polyolefin-based products produced by the said process exhibit excellent breaking ability, which is, for example, very important for the packaging of
    BE2017 / 5368 products that are provided in a clustered form, such as, for example, multipack containers for packaging yogurt. In addition, said steps of the heating and molding method additionally result in a method for producing a polyolefin-based molded product, using a polyolefin-based composition according to an aspect of the present invention, in a shrink ratio of the molded product of maximum 3%, more preferably maximum 2% and even more preferably maximum 1.2%, as measured by ASTM D955. Said shrink ratio of the produced molded product is much smaller than a shrink ratio of a raw polypropylene molded product measured by ASTM D955, which may be between 15 and 30%. This low shrink ratio provides stable production conditions in the production of a molded product.
    In a preferred embodiment, the present invention provides a method for the production of a polyolefin-based molded product, using a polyolefin-based composition further comprising an aspect of the present invention, further comprising the step of trimming said polyolefin based molded product. Accordingly, a trimmed polyolefin-based molded product is formed, which shape and size are refined for specific uses of the molded product. Non-limiting examples are containers that can be used for containing food and / or drinks, such as containers for packaging yogurt.
    In a preferred embodiment, the present invention provides a method for producing a polyolefin-based molded product, using a polyolefin-based composition further comprising an aspect of the present invention, wherein said heating in said first heating step at said various increasing temperature levels is carried out by contact heating.
    In a preferred embodiment, the present invention provides a method for producing a polyolefin-based molded product, using a polyolefin-based composition further comprising an aspect of the present invention, wherein said heating in said second heating step at said various increasing temperature levels is carried out by radiant heating.
    BE2017 / 5368
    Said specific types of heating, i.e. contact heating and radiant heating, as well as their sequence in the production of a polyolefin-based molded product according to a method of the present invention, contribute to the excellent breaking ability of such a product.
    In another aspect, the present invention provides a method of producing a polyolefin-based composition, the method comprising the following steps:
    - providing polyolefin; and
    mixing cycloolefin copolymer of ethylene and norbornene, wherein said norbornene forms 42 to 58, preferably 45 to 55, more preferably 48 to 52 weight percent of said cycloolefin copolymer, to said polyolefin, whereby said polyolefin-based composition is thus obtained.
    In a preferred embodiment, the present invention provides a method of producing a polyolefin-based composition according to an aspect of the present invention, wherein said polyolefin is provided in an amount of 60 to 97 weight percent and said cycloolefin copolymer and ethylene and norbornene is mixed into said polyolefin in an amount of 3 to 15, more preferably 5 to 15, and even more preferably 10 to 15 weight percent, said weight percentages being based on the total weight of the polyolefin based composition .
    In a preferred embodiment, the present invention provides a method of producing a polyolefin based composition according to an aspect of the present invention, the method comprising the step of additionally mixing a heat absorbing composition comprising polyolefin and silicate mineral to the aforementioned polyolefin based composition.
    In a preferred embodiment, the present invention provides a method for producing a polyolefin-based composition according to an aspect of the present invention, wherein said silicate mineral is 0.1 to 30, more particularly 1 to 25, even more
    BE2017 / 5368 particularly constitutes 2 to 20, even more preferably 5 to 18 weight percent of said heat absorbing composition.
    In a preferred embodiment, the present invention provides a method of producing a polyolefin-based composition according to an aspect of the invention, wherein said heat-absorbing composition is mixed with said polyolefin-based composition in an amount of 0.1 to 20 more particularly 1 to 16, even more particularly 2 to 14, even more preferably 3 to 12, and even more preferably 5 to 10 weight percent, based on the total weight of said polyolefin-based composition.
    In a preferred embodiment, the present invention provides a method of producing a polyolefin-based composition according to an aspect of the present invention, wherein said polyolefin is polypropylene.
    For all the technical effects and positive properties of a polyolefin-based composition produced by a method according to an aspect of the invention, reference is made to the above description for the polyolefin-based composition according to an aspect of the invention.
    In another aspect, the present invention provides a polyolefin-based molded product produced from a polyolefin-based composition according to an aspect of the present invention. The specific features and properties of such a product can be understood from the above description.
    In a preferred embodiment, the present invention provides a polyolefin-based molded product produced from a polyolefin-based composition according to an aspect of the present invention, said product being a container suitable for containing food and / or beverage products, and in particular a container for containing dairy products, or an intermediate layer intended for the production of such a container. Such an intermediate layer and container are products that optimally benefit from the positive properties, including the good
    BE2017 / 5368 breaking capacity, which polyolefin-based molded products according to the present invention offer.
    In a preferred embodiment, the present invention provides a polyolefin-based molded product produced from a polyolefin-based composition according to an aspect of the present invention, wherein said product is suitable for non-food applications. Non-limiting examples of non-food applications include the storage of cosmetics and pharmaceuticals, detergent or detergent and dry products.
    EXAMPLES
    The invention will be further described by the following non-limiting examples which further illustrate the invention, which are not intended and should not be construed as limiting the scope of the invention.
    EXAMPLE 1
    A specific embodiment of an aspect of the present invention is presented in Table 1, showing a polypropylene based composition.
    Table 1 Polypropylene-based composition also includes an embodiment of an aspect of the present invention
    Weight percent (%) Polypropylene 85-90 Cycloolefin copolymer of ethyleneand norbornene, wherein saidnorbornene 50 weight percent of thesaid cycloolefin copolymerforms. 10-15
    EXAMPLE 2
    BE2017 / 5368
    A specific embodiment of an aspect of the present invention is presented in Tabei 2, showing a polypropylene based composition.
    Tabei 2 Polypropylene based composition according to an embodiment of an aspect of the present invention
    Weight percent (%) Polypropylene 75-85 Cycloolefin copolymer of ethyleneand norbornene, wherein saidnorbornene 50 weight percent of thesaid cycloolefin copolymerforms. 10-15 heat absorbing compositionincluding polyolefin andsilicate mineral, wherein saidsilicate mineral 10 weight percent ofsaid heat absorbingcomposition 5-10
    EXAMPLE 3
    The polypropylene-based composition of Example 1, as shown in Tabei 1, is first subjected to contact heating with temperature levels of 100, 125, 137 and 142 ° C on heating plates placed above and below said composition (ie double heating), at a cycle rate of 18 cycles per minute, and is then subjected to radiant heating with temperature levels of 325 and 345 ° C on different hot plates, at a cycle rate of 13 cycles per minute.
    This results in a polypropylene-based molded product with excellent stiffness properties, negligible curl phenomena, such as, for example, gutter-like curling, or other undesired product deformations, and acceptable lead times. Accordingly, such polypropylene-based molded products can be used as a highly desirable single-layer polyolefin alternative to single and / or multi-layer polystyrene packaging products
    BE2017 / 5368 that are currently used in the food industry. In addition, such a polypropylene-based molded product exhibits excellent breaking ability, which is, for example, very important for the packaging of products that are provided in a clustered form, such as, for example, multipack containers for containing yogurt. In addition, the polypropylene-based molded product exhibits a shrink ratio of only 1.0% as measured by ASTM D955. Said shrink ratio is much smaller than a raw polypropylene shrink ratio measured by ASTM D955, which may be between 15 and 30%. This low shrinkage ratio of 1.0% offers stable conditions during thermoforming, eg thermoforming.
    EXAMPLE 4
    The polypropylene-based composition of Example 2, as shown in Table 2, is first subjected to contact heating with temperature levels of 100, 120, 130 and 140 ° C on heating plates placed above and below said composition (ie double heating), at a cycle rate of 28 cycles per minute, and is then subjected to radiant heating with temperature levels of 325 and 345 ° C at different hot plates, at a cycle rate of 23 cycles per minute.
    This results in a polypropylene based molded product with very similar properties compared to the product described in Example 3, while a shorter time is required to produce the product. The faster production time can be explained by the inclusion of the heat absorbing composition.
    BE2017 / 5368
    权利要求:
    Claims (18)
    [1]
    CONCLUSIONS
    Use of a polyolefin-based composition for the production of a polyolefin-based molded product, said polyolefin-based composition comprising:
    Polyolefin, wherein said polyolefin constitutes 60 to 70 weight percent of the composition; and
    cycloolefin copolymer of ethylene and norbornene, said norbornene constituting 42 to 58 weight percent of said cycloolefin copolymer and said cycloolefin copolymer constituting 3 to 15 weight percent of the composition.
    [2]
    The use of claim 1, further comprising a heat absorbing composition comprising polyolefin and silicate mineral.
    [3]
    Use according to claim 2, wherein said silicate mineral forms 0.1 to 30 weight percent of said heat absorbing composition.
    [4]
    Use according to claim 2 or 3, wherein said heat absorbing composition constitutes 0.1 to 20 weight percent of the composition.
    [5]
    Use according to any one of claims 1 to 4, wherein said polyolefin is polypropylene.
    [6]
    Use according to any one of claims 1 to 5, wherein said composition further comprises one or more additives selected from the group comprising oxidative and thermal stabilizers, lubricants, anti-adhesives, flame retardants, oxidation inhibitors, oxidation scavengers, dyes, pigments and other colorants, ultraviolet light absorbers and stabilizers, organic and inorganic fillers, including particulate and fibrous fillers, firming agents, nucleators, plasticizers or any combination thereof.
    BE2017 / 5368
    [7]
    Use according to any of claims 1 to 6, wherein, in thermoforming said composition, the shrink ratio of the ratio is maximum 3%, as measured by ASTM D955.
    [8]
    Use according to claims 1 to 7, wherein said polyolefin-based molded product is a container suitable for containing food and / or beverage products, in particular a container for containing dairy products, or an intermediate layer intended for the production of such a container.
    [9]
    Use according to any one of claims 1 to 7, wherein said polyolefin-based molded product is suitable for non-food applications.
    [10]
    Use according to any one of claims 1 to 9, wherein the production of said polyolefin based molded product comprises the following steps:
    - heating said polyolefin-based composition to various increasing temperature levels in a first heating step;
    - heating said polyolefin-based composition to various increasing temperature levels in a second heating step; and molding said polyolefin-based composition into a specific shape into a mold, resulting in a polyolefin-based molded product.
    [11]
    Use according to claim 10, wherein said first heating step corresponds to successively heating said composition at temperatures from 90 to 110 ° C, at temperatures from 110 to 125 ° C, at temperatures from 125 to 140 ° C and at temperatures from 130 to 145 ° C, and at a cycle rate of 16 to 30 cycles per minute.
    [12]
    Use according to claim 10 or 11, wherein said second heating step corresponds to successively heating said composition at temperatures of 315 to 335 ° C, and at
    Π
    /2017 / 5368 temperatures from 335 to 355 ° C, and at a cycle rate of 11 to 25 cycles per minute.
    [13]
    Use according to any one of claims 10 to 12, further comprising the step of trimming said polyolefin based molded product.
    [14]
    Use according to any one of claims 10 to 13, wherein said heating in said first heating step is performed by contact heating at said different ascending temperature levels.
    [15]
    Use according to any one of claims 10 to 14, wherein said heating in said second heating step is performed by radiant heating at said different ascending temperature levels.
    [16]
    Polyolefin-based molded product obtainable according to a use according to any one of claims 1 to 15.
    [17]
    Polyolefin-based molded product according to claim 16, wherein said product is a container suitable for containing food and / or beverage products, and in particular a container for containing dairy products, or an intermediate layer which is intended is for the production of such a container.
    [18]
    The polyolefin-based molded product of claim 16, wherein said product is suitable for non-food applications.
    BE2017 / 5368
    USE OF A POLYOLEFINE-BASED COMPOSITION FOR THE PRODUCTION OF A POLYOLEFINE-BASED PRODUCT AND PRODUCT THAT MAY BE OBTAINED
    类似技术:
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    同族专利:
    公开号 | 公开日
    WO2018211064A1|2018-11-22|
    BE1024763B9|2018-07-24|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP0504418A1|1990-10-05|1992-09-23|Idemitsu Kosan Company Limited|Process for producing cycloolefin polymer, cycloolefin copolymer, and composition and molding prepared therefrom|
    EP1245637A1|1999-11-05|2002-10-02|Zeon Corporation|Light-diffusing resin composition|
    US20080287614A1|2007-05-15|2008-11-20|Sonoco Development, Inc.|Polypropylene-Based Polymer Blend of Enhanced Melt Strength|
    法律状态:
    2018-08-29| FG| Patent granted|Effective date: 20180621 |
    2021-03-19| MM| Lapsed because of non-payment of the annual fee|Effective date: 20200531 |
    优先权:
    申请号 | 申请日 | 专利标题
    BE20175368A|BE1024763B9|2017-05-19|2017-05-19|USE OF A POLYOLEFINE-BASED COMPOSITION FOR THE PRODUCTION OF A POLYOLEFINE-BASED PRODUCT AND PRODUCT THAT MAY BE OBTAINED|BE20175368A| BE1024763B9|2017-05-19|2017-05-19|USE OF A POLYOLEFINE-BASED COMPOSITION FOR THE PRODUCTION OF A POLYOLEFINE-BASED PRODUCT AND PRODUCT THAT MAY BE OBTAINED|
    PCT/EP2018/063066| WO2018211064A1|2017-05-19|2018-05-18|Use of a polyolefin-based composition for manufacturing a polyolefin-based molded product and product obtainable thereby|
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