WO2018211059A1 - Polyolefin-based composition and method for producing a polyolefin-based composition - Google Patents

Polyolefin-based composition and method for producing a polyolefin-based composition Download PDF

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Publication number
WO2018211059A1
WO2018211059A1 PCT/EP2018/063056 EP2018063056W WO2018211059A1 WO 2018211059 A1 WO2018211059 A1 WO 2018211059A1 EP 2018063056 W EP2018063056 W EP 2018063056W WO 2018211059 A1 WO2018211059 A1 WO 2018211059A1
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polyolefin
composition
based composition
weight percent
cyclo
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PCT/EP2018/063056
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French (fr)
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Assia Ouchchen
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Plastic Science By Design Bvba
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene

Definitions

  • the invention relates to a polyolefin-based composition and a method for producing a polyolefin-based composition.
  • Polystyrene is known as a packaging material for holding foods, e.g . dairy products like yoghurt. This application of polystyrene is related to its properties that it gives rigidness to packaging materials, and that the packaging materials show a small amount of shrinkage. End customers complain about the phenomenon of migration of styrene monomer into beverages and foods packed with such polystyrene packaging material, since this migration results in food taste differentiation.
  • multilayer structures may be made in which polystyrene is combined with ethylene vinyl alcohol and polyethylene. Some products do not need the high functionalities related to such multilayer structures. For such products, the multilayer structures can be considered as an inefficient employment of resources.
  • Polyolefin-based materials can be proposed as alternative for said polystyrene packaging material.
  • Polypropylene for example, has better barrier properties, higher temperature resistance, is better retortable, recyclable and processable, and also cheaper than polystyrene.
  • a cyclo-olefin copolymer of ethylene and norbornene may be included to profit from its high rigidity.
  • a composition comprising polypropylene and a cyclo-olefin copolymer of ethylene and norbornene is disclosed in US 2008/0287614 Al .
  • the cyclo-olefin copolymer comprises an amorphous random copolymer of ethylene and norbornene, the cyclo- olefin copolymer comprising at least about 60 wt.% of norbornene.
  • the glass transition temperature of the cyclo-olefin copolymer is relatively high.
  • the norbornene content ranges from about 60 wt.% to about 85 wt.%, and the glass transition temperature correspondingly ranges from about 55° C to about 170° C.
  • the cyclo-olefin copolymer thus is glassy at room temperature and remains glassy at temperatures significantly above room temperature.
  • the glass transition temperature of the cyclo-olefin copolymer is substantially higher than that of the polypropylene in the composition.
  • composition according to US 2008/0287614 Al is intended to enhance the melt strength of polypropylene by blending a cyclo-olefin copolymer into the polypropylene, in order to widen the acceptable processing temperature window for the polypropylene.
  • Such polypropylene composition may however give rise to insufficient crystallization properties for certain thermoforming or extrusion applications, leading to curling phenomena, e.g., gutter-like curling.
  • the present invention aims to resolve at least some of the problems mentioned above.
  • a first aspect of the current invention provides a polyolefin-based composition according to claim 1.
  • said polyolefin-based composition comprises:
  • Said polyolefin-based composition gives rise to excellent rigidity properties in molded products resulting from thermal-molding, e.g. thermoforming, said composition.
  • curling phenomena e.g., gutter-like curling, or other undesired product deformations are negligible when thermal-molding, e.g. thermoforming, said composition.
  • production times of such rigid polyolefin-based molded products are acceptable.
  • said polyolefin-based composition according to the current invention facilitates the production of a much desired monolayer polyolefin alternative for mono- and/or multilayer polystyrene packaging products currently applied in the food industry.
  • the current invention provides a method for producing a polyolefin-based composition according to claim 9. In particular said method comprises the steps of:
  • polyolefin refers to any polymerized olefin, which can be linear, branched, cyclic, aliphatic, aromatic, substituted, or unsubstituted. More specifically, included in the term polyolefin are homopolymers of olefins, copolymers of olefins, copolymers of an olefin and a non-olefinic comonomer copolymerizable with the olefin, such as vinyl monomers, modified polymers thereof, and the like.
  • polypropylene homopolymers examples include polypropylene homopolymers, polyethylene homopolymers, polybutene, propylene/alpha-olefin copolymers, ethylene/alpha-olefin copolymers, butene/alpha-olefin copolymers, ethylene/vinyl acetate copolymers, ethylene/ethyl acrylate copolymers, ethylene/butyl acrylate copolymers, ethylene/methyl acrylate copolymers, ethylene/acrylic acid copolymers, ethylene/methacrylic acid copolymers, modified 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 such as the anhydride, ester or metal salt or the like. It could also be obtained by incorporating into 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, ester or metal salt or the like.
  • an unsaturated carboxylic acid e.g., maleic acid, fumaric acid or the like
  • a derivative thereof such as the anhydride, ester or metal salt or the like.
  • polypropylene' is meant as a polymer selected from the group comprising polypropylene homopolymer, polypropylene copolymer (random, block, or grafted), polypropylene terpolymer, polypropylene interpolymer (comprising one or more comonomers), a polypropylene with ethylene-containing blocks, a polypropylene with ethylene-containing blocks that comprise polyethylene, or any combination thereof.
  • Other ethylene-containing blocks may include ethylene-propylene rubber.
  • the polyethylene may be selected from polyethylene homopolymer, , polyethylene copolymer, polyethylene terpolymer and polyethylene interpolymers consisting of one or more additional co-monomers with alpha substituted olefins and unsaturated olefin monomer, low molecular weight olefin olegomers, waxes, and elastomeric homo- and co-polymers thereof.
  • the blocks may also contain short chain branches of ethylene or alpha olefin and substituted olefin molecules, including unsaturations. These examples are merely illustrative and not limiting.
  • 'cyclo-olefin copolymer of ethylene and norbornene' refers to a copolymer that is based on the copolymerization of ethylene with norbornene.
  • the term 'molded product' is used to refer to products obtained by known thermal-molding methods such as extrusion molding, injection molding, inflation molding, blow molding, extrusion blow molding, injection blow molding, press molding, vacuum molding, calendaring, expansion molding, and thermoforming, or any combination thereof.
  • molded product may be produced in highly different shapes and product types.
  • Non-limiting examples of molded product types include sheets, films and containers.
  • Non-limiting examples of molded product types suited for holding food and/or beverage products include tubs, trays, jars, containers and cups for food and/or beverage packaging.
  • the term 'snapability' refers to the ability of products, in particular of polyolefin-based molded products derived from a polyolefin-based composition according to the present invention, to deliberately snap or break under flexural deformation. Snapability is usually facilitated on molded products, such as containers, by applying precut steps. Precut steps involve implementing a mechanical trimming tool that impacts and penetrates a plastic sheet with a controlled precut depth. The implementation of such precut steps does however not guarantee a desired snapability. A too brittle material will lead to cracks appearing on edges when flexural deforming a product of such material.
  • the term 'silicate mineral' includes silica, silicates, zeolites or a combination thereof.
  • Silica may include precipitated silica, amorphous fumed silica, fused silica, silica gel, and/or mixtures thereof.
  • Silicates may include those compounds containing silicon, oxygen, and one or more metals with or without hydrogen. Both synthetic and naturally occurring silicates may be used in one or more embodiments. Examples of naturally occurring silicates include gemstones, berly, asbestos, talc, clays, feldspar, mica, and mixtures thereof.
  • An example of a synthetic silicate includes sodium silicate.
  • silicates include tetracalcium aluminoferrate, tricalcium silicate, dicalcium silicate, calcium metasilicate, and mixtures thereof.
  • Other useful silicates include hydrated aluminum silicates, which may also be referred to as clays.
  • Exemplary clays include kaolinite, montmorillonite, atapulgite, illite, bentonite, halloysite, and mixtures thereof.
  • Still other useful silicates include hydrated magnesium silicates, which may be referred to as talcs.
  • Exemplary talcs include talcum, soapstone, steatite, cerolite, magnesium talc, steatite-massive, and mixtures thereof.
  • Exemplary zeolites include any of the naturally occurring or synthetic zeolites. Examples of these zeolites include large pore zeolites, medium pore zeolites, and small pore zeolites.
  • the current invention provides a polyolefin-based composition comprising :
  • cyclo-olefin copolymer of ethylene and norbornene wherein said norbornene constitutes 42 to 58, preferably 45 to 55, more preferably 48 to 52 weight percent of said cyclo-olefin copolymer.
  • Said polyolefin-based composition gives rise to excellent rigidity properties in molded products resulting from thermal-molding, e.g. thermoforming, said composition. At the same time, curling phenomena, e.g., gutter-like curling, or other undesired product deformations are negligible when thermal-molding, e.g. thermoforming, said composition. Besides, production times of such rigid poly- olefin-based molded products are acceptable. As a result, said polyolefin-based composition according to the current invention facilitates the production of a much desired monolayer polyolefin alternative for mono- and/or multilayer polystyrene packaging products currently applied in the food industry.
  • molded products resulting from thermal-molding e.g. thermoforming, said polyolefin-based composition
  • the present invention provides a polyolefin-based composition according to the first aspect of the invention, wherein said polyolefin constitutes 60 to 97 weight percent of the composition, and said cyclo-olefin copolymer of ethylene and norbornene constitutes 3 to 15, more preferably 5 to 15, and even more preferably 10 to 15 weight percent of the composition.
  • Said amounts of said polyolefin and said cyclo-olefin copolymer of ethylene and norbornene in the polyolefin-based composition have been found to be ideally suited to achieve very excellent rigidity properties in molded products resulting from thermal-molding, e.g. thermoforming, the composition. Additionally, said amounts have been found to lead to very excellent snapability in resulting molded products.
  • the present invention provides a polyolefin-based composition according to the first aspect of the invention, further comprising a heat absorber composition comprising polyolefin and silicate mineral.
  • Said heat absorber composition improves the processability of the polyolefin-based composition according to the present invention.
  • Inclusion of the heat absorber composition leads to reduced production times when thermal-molding said composition into a molded product.
  • said composition including the heat absorber composition leads to reduced production times when thermoforming said composition into a molded product.
  • Silicate mineral defined above, is a material absorbing heat. It absorbs heat when thermal-molding, e.g. thermoforming, a polyolefin-based composition according to the first aspect of the invention, enabling faster processing of said composition into desired polyolefin-based molded products.
  • the heat absorber composition comprising silicate mineral absorbs heat during heat contact steps in the initial stages of a thermoforming process.
  • polyolefin and cyclo-olefin copolymer When said polyolefin and cyclo-olefin copolymer are subsequently heated during the thermoforming process, polyolefin will slowly pass into viscoelastic state while cyclo-olefin copolymer, in presence of the heat absorber composition, will faster pass into thermoform phase and pass heat to polyolefin since the cyclo-olefin copolymer molecules obtain some additional freedom of movement. Besides, the heat absorber composition will generally absorb heat and will be saturated quickly with said heat, which on its turn will be released quickly to the polyolefin, leading to a faster obtainment of viscoelastic flow properties desired for thermoforming.
  • the present invention provides a polyolefin-based composition according to the first aspect of the invention, wherein said silicate mineral constitutes 0.1 to 30, more preferably 1 to 25, even more preferably 2 to 20, yet even more preferably 5 to 18 weight percent of said heat absorber composition. Said amounts of said silicate mineral are optimally suited to provide the heat absorber composition with a desired heat absorbing functionality.
  • the present invention provides a polyolefin-based composition according to the first aspect of the invention, wherein said heat absorber composition constitutes 0.1 to 20, more preferably 1 to 16, even more preferably 2 to 14, yet even more preferably 3 to 12, and yet even more preferably 5 to 10 weight percent of the composition.
  • the heat absorber composition included in the composition according to said amounts, improves the processability of the polyolefin-based composition according to the present invention most efficiently.
  • the present invention provides a polyolefin-based composition according to the first aspect of the invention, wherein said polyolefin is polypropylene.
  • polypropylene is especially suitable in the context of the present invention, seen its excellent barrier properties, temperature resistance, retortability, recyclability, processability and low cost.
  • the present invention provides a polyolefin-based composition according to the first aspect of the invention, wherein said composition further comprises one or more additives selected from the group comprising oxidative and thermal stabilizers, lubricants, release agents, flame-retarding agents, oxidation inhibitors, oxidation scavengers, dyes, pigments and other coloring agents, ultraviolet light absorbers and stabilizers, organic or inorganic fillers, including particulate and fibrous fillers, reinforcing agents, nucleators, plasticizers, or any combination thereof.
  • Representative ultraviolet light stabilizers include various substituted resorcinols, salicylates, benzotriazoles, benzophenones, and the like.
  • Suitable lubricants and release agents include wax, stearic acid, stearyl alcohol, and stearamides.
  • Exemplary flame-retardants include organic halogenated compounds, including decabromodiphenyl ether and the like as well as inorganic compounds.
  • Suitable coloring agents 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 include the Period Table of Element's Group I metal halides, such as sodium halides, potassium halides, lithium halides; as well as cuprous halides; and further, chlorides, bromides, iodides.
  • plasticizers include lactams such as caprolactam and lauryl lactam, sulfonamides such as o,p- toluenesulfonamide and N-ethyl, N-butyl benylenesulfonamide, and combinations of any of the above, as well as other plasticizers known to the art.
  • said one or more additives may be chosen to fine-tune the properties of said polyolefin-based composition.
  • the present invention provides a polyolefin-based composition according to the first aspect of the invention, wherein, when thermal- molding, e.g. thermoforming, said composition, the shrinkage ratio of the composition is at most 3%, more preferably at most 2%, and yet even more preferably at most 1.2%, as measured by ASTM D955.
  • Said shrinkage ratio of the polyolefin-based composition according to the first aspect of the invention is much smaller than a shrinkage ratio of virgin polypropylene measured by ASTM D955, which can be situated between 15 and 30%.
  • This low shrinkage ratio offers stable conditions when thermal-molding, e.g. thermoforming, said polyolefin-based composition.
  • the current invention provides a method for producing a polyolefin-based composition, the method comprising the steps of:
  • the present invention provides a method according to the second aspect of the current invention, wherein said polyolefin is provided in an amount of 60 to 97 weight percent and wherein said cyclo-olefin copolymer of ethylene and norbornene is blended into said polyolefin in an amount of 3 to 15, more preferably 5 to 15, and even more preferably 10 to 15 weight percent, wherein said weight percentages are based on the total weight of said polyolefin- based composition.
  • the present invention provides a method according to the second aspect of the current invention, wherein the method further comprises the step of additionally blending a heat absorber composition comprising polyolefin and silicate mineral into said polyolefin-based composition.
  • the present invention provides a method according to the second aspect of the current invention, wherein said silicate mineral constitutes 0.1 to 30, more preferably 1 to 25, even more preferably 2 to 20, yet even more preferably 5 to 18 weight percent of said heat absorber composition.
  • the present invention provides a method according to the second aspect of the current invention, wherein said heat absorber composition is blended into said polyolefin-based composition in an amount of 0.1 to 20, more preferably 1 to 16, even more preferably 2 to 14, yet even more preferably 3 to 12, and yet even more preferably 5 to 10 weight percent, based on the total weight of said polyolefin-based composition.
  • the present invention provides a method according to the second aspect of the current invention, wherein said polyolefin is polypropylene.
  • the current invention provides a use of a polyolefin-based composition for manufacturing a polyolefin-based molded product, said polyolefin- based composition comprising :
  • cyclo-olefin copolymer of ethylene and norbornene wherein said norbornene constitutes 42 to 58, preferably 45 to 55, more preferably 48 to 52 weight percent of said cyclo-olefin copolymer.
  • Said polyolefin-based composition gives rise to molded products manufactured therefrom with excellent rigidity properties.
  • excellent rigidity properties can be observed in molded products resulting from thermal-molding, e.g. thermoforming, said composition.
  • curling phenomena e.g., gutter-like curling, or other undesired product deformations are negligible when thermal-molding, e.g. thermoforming, said composition.
  • production times of such rigid polyolefin-based molded products are acceptable.
  • said use of said polyolefin-based composition for manufacturing a polyolefin-based molded product facilitates the manufacturing of a much desired monolayer polyolefin alternative for mono- and/or multilayer polystyrene packaging products currently applied in the food industry.
  • molded products manufactured from said polyolefin-based composition such as molded products resulting from thermal-molding, e.g. thermoforming, said polyolefin-based composition, show excellent snapability. This is in particular of importance for packaging products that are provided in a clustered form, such as, for example, multipack containers for holding yoghurt.
  • a clustered form such as, for example, multipack containers for holding yoghurt.
  • the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said polyolefin constitutes 60 to 97 weight percent of the composition, and said cyclo-olefin copolymer of ethylene and norbornene constitutes 3 to 15, more preferably 5 to 15, and even more preferably 10 to 15 weight percent of the composition.
  • Said amounts of said polyolefin and said cyclo-olefin copolymer of ethylene and norbornene in the polyolefin-based composition have been found to be ideally suited to achieve very excellent rigidity properties in molded products manufactured therefrom, such as molded products resulting from thermal-molding, e.g. thermoforming, the composition. Additionally, said amounts have been found to lead to very excellent snapability in resulting molded products.
  • the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, further comprising a heat absorber composition comprising polyolefin and silicate mineral.
  • Said heat absorber composition improves the processability of the polyolefin-based composition according to the present invention.
  • Inclusion of the heat absorber composition leads to reduced production times when manufacturing a molded product from said composition, in particular when thermal-molding said composition into a molded product.
  • said composition including the heat absorber composition leads to reduced production times when thermoforming said composition into a molded product.
  • Silicate mineral defined above, is a material absorbing heat. It absorbs heat when thermal-molding, e.g. thermoforming, a polyolefin-based composition, enabling faster processing of said composition into desired polyolefin-based molded products.
  • thermal-molding e.g. thermoforming
  • the heat absorber composition comprising silicate mineral absorbs heat during heat contact steps in the initial stages of a thermoforming process.
  • polyolefin and cyclo-olefin copolymer When said polyolefin and cyclo-olefin copolymer are subsequently heated during the thermoforming process, polyolefin will slowly pass into viscoelastic state while cyclo-olefin copolymer, in presence of the heat absorber composition, will faster pass into thermoform phase and pass heat to polyolefin since the cyclo-olefin copolymer molecules obtain some additional freedom of movement. Besides, the heat absorber composition will generally absorb heat and will be saturated quickly with said heat, which on its turn will be released quickly to the polyolefin, leading to a faster obtainment of viscoelastic flow properties desired for thermoforming.
  • the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said silicate mineral constitutes 0.1 to 30, more preferably 1 to 25, even more preferably 2 to 20, yet even more preferably 5 to 18 weight percent of said heat absorber composition. Said amounts of said silicate mineral are optimally suited to provide the heat absorber composition with a desired heat absorbing functionality.
  • the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said heat absorber composition constitutes 0.1 to 20, more preferably 1 to 16, even more preferably 2 to 14, yet even more preferably 3 to 12, and yet even more preferably 5 to 10 weight percent of the composition.
  • the heat absorber composition included in the composition according to said amounts, improves the processability of the polyolefin-based composition according to the present invention most efficiently.
  • the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said polyolefin is polypropylene.
  • Polypropylene is especially suitable in the context of the present invention, seen its excellent barrier properties, temperature resistance, retortability, recyclability, processability and low cost.
  • the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said composition further comprises one or more additives selected from the group comprising oxidative and thermal stabilizers, lubricants, release agents, flame-retarding agents, oxidation inhibitors, oxidation scavengers, dyes, pigments and other coloring agents, ultraviolet light absorbers and stabilizers, organic or inorganic fillers, including particulate and fibrous fillers, reinforcing agents, nucleators, plasticizers, or any combination thereof.
  • additives selected from the group comprising oxidative and thermal stabilizers, lubricants, release agents, flame-retarding agents, oxidation inhibitors, oxidation scavengers, dyes, pigments and other coloring agents, ultraviolet light absorbers and stabilizers, organic or inorganic fillers, including particulate and fibrous fillers, reinforcing agents, nucleators, plastic
  • Representative ultraviolet light stabilizers include various substituted resorcinols, salicylates, benzotriazoles, benzophenones, and the like.
  • Suitable lubricants and release agents include wax, stearic acid, stearyl alcohol, and stearamides.
  • Exemplary flame-retardants include organic halogenated compounds, including decabromodiphenyl ether and the like as well as inorganic compounds.
  • Suitable coloring agents 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 include the Period Table of Element's Group I metal halides, such as sodium halides, potassium halides, lithium halides; as well as cuprous halides; and further, chlorides, bromides, iodides. Also acceptable are hindered phenols, hydroquinones, aromatic amines as well as substituted members of those above mentioned groups and combinations thereof.
  • Exemplary plasticizers include lactams such as caprolactam and lauryl lactam, sulfonamides such as ⁇ , ⁇ -toluenesulfonamide and N-ethyl, N-butyl benylenesulfonamide, and combinations of any of the above, as well as other plasticizers known to the art.
  • said one or more additives may be chosen to fine-tune the properties of said polyolefin-based composition.
  • the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein, when thermal-molding, e.g. thermoforming, said composition, the shrinkage ratio of the composition is at most 3%, more preferably at most 2%, and yet even more preferably at most 1.2%, as measured by ASTM D955.
  • the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said polyolefin-based molded product is a container suited for holding food and/or beverage products, and in particular a container for holding dairy products, or is an intermediate sheet intended for manufacturing such container.
  • Such intermediate sheet and container are products which benefit optimally from the positive properties, including good snapability, of products manufactured by the use of a polyolefin-based composition according to an aspect of the invention.
  • the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said polyolefin-based molded product is suited for non-food applications.
  • non-food applications comprise the storage of cosmetic and pharmaceutical products, dishwashing or washing detergent and dry products.
  • the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein the manufacturing of said polyolefin-based molded product comprises the steps of:
  • the present invention provides a use according to the first aspect of the current invention, wherein said first heating step corresponds to consecutively 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 speed of 16 to 30 cycles per minute.
  • the present invention provides a use of a polyolefin-based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said second heating step corresponds to consecutively heating said composition at temperatures from 315 to 335 °C, and at temperatures from 335 to 355 °C, and at a cycle speed of 11 to 25 cycles per minute.
  • Manufacturing of said polyolefin-based molded product according to said steps results in a polyolefin-based molded product with excellent rigidity properties, negligible curling phenomena, such as, e.g. gutter-like curling, or other undesired product deformations, and acceptable production times.
  • a resulting polyolefin- based molded product can be used as a much desired monolayer polyolefin alternative for mono- and/or multilayer polystyrene packaging products currently applied in the food industry. Additionally, resulting polyolefin-based molded products show an excellent snapability, which is, for example, of particular importance for packaging products that are provided in a clustered form, such as, for example, multipack containers for holding yoghurt. Besides, said steps of heating and forming result in a shrinkage ratio of the molded product of at most 3%, more preferably at most 2%, and yet even more preferably at most 1.2%, as measured by ASTM D955.
  • Said shrinkage ratio of the manufactured molded product is much smaller than a shrinkage ratio of a virgin polypropylene molded product measured by ASTM D955, which can be situated between 15 and 30%. This low shrinkage ratio offers stable manufacturing conditions when manufacturing a molded product.
  • the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, further comprising the step of trimming said polyolefin-based molded product.
  • a trimmed polyolefin-based molded product is obtained, which form and size are fine-tuned for specific uses of the molded product.
  • Non-limiting examples are containers which can be used for holding foods and/or beverages, like containers for holding yoghurt.
  • the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said heating in said first heating step at said different ascending temperature levels is performed by contact heating.
  • the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said heating in said second heating step at said different ascending temperature levels is performed by radiation heating.
  • Said specific types of heating i.e., contact heating and radiation heating, as well as the sequence thereof when manufacturing a polyolefin-based molded product according to a use according to an aspect of the present invention, contribute to the excellent snapability of such product.
  • the current invention provides a polyolefin-based molded product obtainable according to a use of a polyolefin-based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention.
  • a polyolefin-based molded product obtainable according to a use of a polyolefin-based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention.
  • the specific characteristics and properties of such product can be understood from the description disclosed above.
  • the present invention provides a polyolefin-based molded product obtainable according to a use of a polyolefin-based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said product is a container suited for holding food and/or beverage products, and in particular a container for holding dairy products, or is an intermediate sheet intended for manufacturing such container.
  • Such intermediate sheet and container are products which benefit optimally from the positive properties, including good snapability, which polyolefin-based molded products according to the present invention offer.
  • the present invention provides a polyolefin-based molded product obtainable according to a use of a polyolefin-based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said product is suited for non-food applications.
  • non-food applications comprise the storage of cosmetic and pharmaceutical products, dishwashing or washing detergent and dry products.
  • the current invention provides a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention.
  • a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention enables the production of polyolefin-based molded products with high rigidity, good snapability and negligible curling phenomena, that can be used as a much desired monolayer polyolefin alternative for mono- and/or multilayer polystyrene packaging products currently applied in the food industry.
  • the present invention provides a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, comprising the steps of:
  • the present invention provides a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, wherein said first heating step corresponds to consecutively 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 speed of 16 to 30 cycles per minute.
  • the present invention provides a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, wherein said second heating step corresponds to consecutively heating said composition at temperatures from 315 to 335 °C, and at temperatures from 335 to 355 °C, and at a cycle speed of 11 to 25 cycles per minute.
  • a polyolefin-based composition according to the first aspect of the current invention Subjecting a polyolefin-based composition according to the first aspect of the current invention to said steps of the method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, results in a polyolefin-based molded product with excellent rigidity properties, negligible curling phenomena, such as, e.g. gutter-like curling, or other undesired product deformations, and acceptable production times.
  • said method enables the production of polyolefin-based molded products which can be used as a much desired monolayer polyolefin alternative for mono- and/or multilayer polystyrene packaging products currently applied in the food industry.
  • polyolefin-based products produced by said method show an excellent snapability, which is, for example, of particular importance for packaging products that are provided in a clustered form, such as, for example, multipack containers for holding yoghurt.
  • said method steps of heating and forming according to a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention result in a shrinkage ratio of the molded product of at most 3%, more preferably at most 2%, and yet even more preferably at most 1.2%, as measured by ASTM D955.
  • Said shrinkage ratio of the produced molded product is much smaller than a shrinkage ratio of a virgin polypropylene molded product measured by ASTM D955, which can be situated between 15 and 30%. This low shrinkage ratio offers stable production conditions when producing a molded product.
  • the present invention provides a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, further comprising the step of trimming said polyolefin-based molded product.
  • a trimmed polyolefin- based molded product is obtained, which form and size are fine-tuned for specific uses of the molded product.
  • Non-limiting examples are containers which can be used for holding foods and/or beverages, like containers for holding yoghurt.
  • the present invention provides a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, wherein said heating in said first heating step at said different ascending temperature levels is performed by contact heating.
  • the present invention provides a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, wherein said heating in said second heating step at said different ascending temperature levels is performed by radiation heating.
  • Said specific types of heating i.e., contact heating and radiation heating, as well as the sequence thereof when producing a polyolefin-based molded product according to a method of the present invention, contribute to the excellent snapability of such product.
  • the current invention provides a polyolefin-based molded product obtainable according to a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, or manufactured from a polyolefin-based composition according to the first aspect of the current invention.
  • a polyolefin-based molded product obtainable according to a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, or manufactured from a polyolefin-based composition according to the first aspect of the current invention.
  • the present invention provides a polyolefin-based molded product obtainable according to a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, or manufactured from a polyolefin-based composition according to the first aspect of the current invention, wherein said product is a container suited for holding food and/or beverage products, and in particular a container for holding dairy products, or is an intermediate sheet intended for manufacturing such container.
  • Such intermediate sheet and container are products which benefit optimally from the positive properties, including good snapability, which polyolefin-based molded products according to the present invention offer.
  • the present invention provides a polyolefin-based molded product obtainable according to a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, or manufactured from a polyolefin-based composition according to the first aspect of the current invention, wherein said product is suited for non-food applications.
  • non-food applications comprise the storage of cosmetic and pharmaceutical products, dishwashing or washing detergent and dry products.
  • heat absorber composition comprising 5-10 polyolefin and silicate mineral, wherein
  • said silicate mineral constitutes 10
  • the polypropylene-based composition according to Example 1, as shown in Table 1, is first subjected to contact heating with temperature levels of 100, 125, 137 and 142 °C at heating plates placed above and below said composition (i.e. double heating), at a cycle speed of 18 cycles per minute, and is secondly subjected to radiation heating with temperature levels of 325 and 345 °C at different heating plates, at a cycle speed of 13 cycles per minute.
  • polypropylene-based molded product with excellent rigidity properties, negligible curling phenomena, such as, e.g. gutter-like curling, or other undesired product deformations, and acceptable production times.
  • polypropylene-based molded products can be used as a much desired monolayer polyolefin alternative for mono- and/or multilayer polystyrene packaging products currently applied in the food industry.
  • polypropylene-based molded product shows an excellent snapability, which is, for example, of particular importance for packaging products that are provided in a clustered form, such as, for example, multipack containers for holding yoghurt.
  • the polypropylene- based molded product shows a shrinkage ratio of only 1.0%, as measured by ASTM D955. Said shrinkage ratio is much smaller than a shrinkage ratio of virgin polypropylene measured by ASTM D955, which can be situated between 15 and 30%. This low shrinkage ratio of 1.0% offers stable conditions during thermal- molding, e.g. thermoforming.
  • the polypropylene-based composition according to Example 2 is first subjected to contact heating with temperature levels of 100, 120, 130 and 140 °C at heating plates placed above and below said composition (i.e. double heating), at a cycle speed of 28 cycles per minute, and is secondly subjected to radiation heating with temperature levels of 325 and 345 °C at different heating plates, at a cycle speed of 23 cycles per minute.

Abstract

The current invention relates to a polyolefin-based composition comprising: -polyolefin; and -cyclo-olefin copolymer of ethylene and norbornene, wherein said norbornene constitutes 42 to 58 weight percent of said cyclo-olefin copolymer. Besides, the current invention relates to a method for producing a polyolefin-based composition.

Description

POLYOLEFIN-BASED COMPOSITION AND METHOD FOR PRODUCING A POLYOLEFIN-BASED COMPOSITION
TECHNICAL FIELD
The invention relates to a polyolefin-based composition and a method for producing a polyolefin-based composition.
BACKGROUND
Polystyrene is known as a packaging material for holding foods, e.g . dairy products like yoghurt. This application of polystyrene is related to its properties that it gives rigidness to packaging materials, and that the packaging materials show a small amount of shrinkage. End customers complain about the phenomenon of migration of styrene monomer into beverages and foods packed with such polystyrene packaging material, since this migration results in food taste differentiation.
In order to avoid this phenomenon, multilayer structures may be made in which polystyrene is combined with ethylene vinyl alcohol and polyethylene. Some products do not need the high functionalities related to such multilayer structures. For such products, the multilayer structures can be considered as an inefficient employment of resources.
Polyolefin-based materials can be proposed as alternative for said polystyrene packaging material. Polypropylene, for example, has better barrier properties, higher temperature resistance, is better retortable, recyclable and processable, and also cheaper than polystyrene. A cyclo-olefin copolymer of ethylene and norbornene may be included to profit from its high rigidity. A composition comprising polypropylene and a cyclo-olefin copolymer of ethylene and norbornene is disclosed in US 2008/0287614 Al . The cyclo-olefin copolymer comprises an amorphous random copolymer of ethylene and norbornene, the cyclo- olefin copolymer comprising at least about 60 wt.% of norbornene. As a result of the high norbornene content of the cyclo-olefin copolymer, the glass transition temperature of the cyclo-olefin copolymer is relatively high. In preferred embodiments, the norbornene content ranges from about 60 wt.% to about 85 wt.%, and the glass transition temperature correspondingly ranges from about 55° C to about 170° C. The cyclo-olefin copolymer thus is glassy at room temperature and remains glassy at temperatures significantly above room temperature. The glass transition temperature of the cyclo-olefin copolymer is substantially higher than that of the polypropylene in the composition.
The composition according to US 2008/0287614 Al is intended to enhance the melt strength of polypropylene by blending a cyclo-olefin copolymer into the polypropylene, in order to widen the acceptable processing temperature window for the polypropylene. Such polypropylene composition may however give rise to insufficient crystallization properties for certain thermoforming or extrusion applications, leading to curling phenomena, e.g., gutter-like curling.
The present invention aims to resolve at least some of the problems mentioned above.
SUMMARY OF THE INVENTION
To this purpose, a first aspect of the current invention provides a polyolefin-based composition according to claim 1. In particular, said polyolefin-based composition comprises:
- polyolefin; and
- cyclo-olefin copolymer of ethylene and norbornene, wherein said norbornene constitutes 42 to 58 weight percent of said cyclo-olefin copolymer.
Said polyolefin-based composition gives rise to excellent rigidity properties in molded products resulting from thermal-molding, e.g. thermoforming, said composition. At the same time, curling phenomena, e.g., gutter-like curling, or other undesired product deformations are negligible when thermal-molding, e.g. thermoforming, said composition. Besides, production times of such rigid polyolefin-based molded products are acceptable. As a result, said polyolefin-based composition according to the current invention facilitates the production of a much desired monolayer polyolefin alternative for mono- and/or multilayer polystyrene packaging products currently applied in the food industry. In a second aspect, the current invention provides a method for producing a polyolefin-based composition according to claim 9. In particular said method comprises the steps of:
- providing polyolefin; and
- blending cyclo-olefin copolymer of ethylene and norbornene, wherein said norbornene constitutes 42 to 58 weight percent of said cyclo-olefin copolymer, into said polyolefin, thus obtaining said polyolefin-based composition. DETAILED DESCRIPTION OF THE INVENTION
The recitation of numerical ranges by endpoints includes all numbers and fractions subsumed within that range, as well as the recited 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, included in the term polyolefin are homopolymers of olefins, copolymers of olefins, copolymers of an olefin and a non-olefinic comonomer copolymerizable 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/vinyl acetate copolymers, ethylene/ethyl acrylate copolymers, ethylene/butyl acrylate copolymers, ethylene/methyl acrylate copolymers, ethylene/acrylic acid copolymers, ethylene/methacrylic acid copolymers, modified 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 such as the anhydride, ester or metal salt or the like. It could also be obtained by incorporating into 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, ester or metal salt or the like.
In the present text, the term 'polypropylene' is meant as a polymer selected from the group comprising polypropylene homopolymer, polypropylene copolymer (random, block, or grafted), polypropylene terpolymer, polypropylene interpolymer (comprising one or more comonomers), a polypropylene with ethylene-containing blocks, a polypropylene with ethylene-containing blocks that comprise polyethylene, or any combination thereof. Other ethylene-containing blocks may include ethylene-propylene rubber. For said polypropylene with ethylene-containing blocks that comprise polyethylene, the polyethylene may be selected from polyethylene homopolymer, , polyethylene copolymer, polyethylene terpolymer and polyethylene interpolymers consisting of one or more additional co-monomers with alpha substituted olefins and unsaturated olefin monomer, low molecular weight olefin olegomers, waxes, and elastomeric homo- and co-polymers thereof. The blocks may also contain short chain branches of ethylene or alpha olefin and substituted olefin molecules, including unsaturations. These examples are merely illustrative and not limiting. Any other type of polypropylene suited for the current invention, as known from the state of the art, may be selected. The term 'cyclo-olefin copolymer of ethylene and norbornene' refers to a copolymer that is based on the copolymerization of ethylene with norbornene.
As used herein, the term 'molded product' is used to refer to products obtained by known thermal-molding methods such as extrusion molding, injection molding, inflation molding, blow molding, extrusion blow molding, injection blow molding, press molding, vacuum molding, calendaring, expansion molding, and thermoforming, or any combination thereof. Such molded product may be produced in highly different shapes and product types. Non-limiting examples of molded product types include sheets, films and containers. Non-limiting examples of molded product types suited for holding food and/or beverage products include tubs, trays, jars, containers and cups for food and/or beverage packaging.
In the current text, the term 'snapability' refers to the ability of products, in particular of polyolefin-based molded products derived from a polyolefin-based composition according to the present invention, to deliberately snap or break under flexural deformation. Snapability is usually facilitated on molded products, such as containers, by applying precut steps. Precut steps involve implementing a mechanical trimming tool that impacts and penetrates a plastic sheet with a controlled precut depth. The implementation of such precut steps does however not guarantee a desired snapability. A too brittle material will lead to cracks appearing on edges when flexural deforming a product of such material. Moreover, it may prove beneficial that a product can be broken into separate parts with clean edges with negligible amounts of cracks or other irregularities, without even using such precut steps. As used herein, the term 'silicate mineral', includes silica, silicates, zeolites or a combination thereof. Silica may include precipitated silica, amorphous fumed silica, fused silica, silica gel, and/or mixtures thereof. Silicates may include those compounds containing silicon, oxygen, and one or more metals with or without hydrogen. Both synthetic and naturally occurring silicates may be used in one or more embodiments. Examples of naturally occurring silicates include gemstones, berly, asbestos, talc, clays, feldspar, mica, and mixtures thereof. An example of a synthetic silicate includes sodium silicate. Examples of silicates include tetracalcium aluminoferrate, tricalcium silicate, dicalcium silicate, calcium metasilicate, and mixtures thereof. Other useful silicates include hydrated aluminum silicates, which may also be referred to as clays. Exemplary clays include kaolinite, montmorillonite, atapulgite, illite, bentonite, halloysite, and mixtures thereof. Still other useful silicates include hydrated magnesium silicates, which may be referred to as talcs. Exemplary talcs include talcum, soapstone, steatite, cerolite, magnesium talc, steatite-massive, and mixtures thereof. Exemplary zeolites include any of the naturally occurring or synthetic zeolites. Examples of these zeolites include large pore zeolites, medium pore zeolites, and small pore zeolites.
In a first aspect, the current invention provides a polyolefin-based composition comprising :
- polyolefin; and
cyclo-olefin copolymer of ethylene and norbornene, wherein said norbornene constitutes 42 to 58, preferably 45 to 55, more preferably 48 to 52 weight percent of said cyclo-olefin copolymer. Said polyolefin-based composition gives rise to excellent rigidity properties in molded products resulting from thermal-molding, e.g. thermoforming, said composition. At the same time, curling phenomena, e.g., gutter-like curling, or other undesired product deformations are negligible when thermal-molding, e.g. thermoforming, said composition. Besides, production times of such rigid poly- olefin-based molded products are acceptable. As a result, said polyolefin-based composition according to the current invention facilitates the production of a much desired monolayer polyolefin alternative for mono- and/or multilayer polystyrene packaging products currently applied in the food industry.
Additionally, molded products resulting from thermal-molding, e.g. thermoforming, said polyolefin-based composition, show excellent snapability. This is in particular of importance for packaging products that are provided in a clustered form, such as, for example, multipack containers for holding yoghurt.
For a skilled person, it should be possible to acquire the components of said cyclo- olefin copolymer according to the current invention, and thus to obtain said specific copolymer and subsequently to obtain the polyolefin-based composition according to the invention.
In a preferred embodiment, the present invention provides a polyolefin-based composition according to the first aspect of the invention, wherein said polyolefin constitutes 60 to 97 weight percent of the composition, and said cyclo-olefin copolymer of ethylene and norbornene constitutes 3 to 15, more preferably 5 to 15, and even more preferably 10 to 15 weight percent of the composition. Said amounts of said polyolefin and said cyclo-olefin copolymer of ethylene and norbornene in the polyolefin-based composition have been found to be ideally suited to achieve very excellent rigidity properties in molded products resulting from thermal-molding, e.g. thermoforming, the composition. Additionally, said amounts have been found to lead to very excellent snapability in resulting molded products.
In a preferred embodiment, the present invention provides a polyolefin-based composition according to the first aspect of the invention, further comprising a heat absorber composition comprising polyolefin and silicate mineral.
Said heat absorber composition improves the processability of the polyolefin-based composition according to the present invention. Inclusion of the heat absorber composition leads to reduced production times when thermal-molding said composition into a molded product. In particular, said composition including the heat absorber composition leads to reduced production times when thermoforming said composition into a molded product. Silicate mineral, defined above, is a material absorbing heat. It absorbs heat when thermal-molding, e.g. thermoforming, a polyolefin-based composition according to the first aspect of the invention, enabling faster processing of said composition into desired polyolefin-based molded products. In particular, it has been found that the heat absorber composition comprising silicate mineral absorbs heat during heat contact steps in the initial stages of a thermoforming process. When said polyolefin and cyclo-olefin copolymer are subsequently heated during the thermoforming process, polyolefin will slowly pass into viscoelastic state while cyclo-olefin copolymer, in presence of the heat absorber composition, will faster pass into thermoform phase and pass heat to polyolefin since the cyclo-olefin copolymer molecules obtain some additional freedom of movement. Besides, the heat absorber composition will generally absorb heat and will be saturated quickly with said heat, which on its turn will be released quickly to the polyolefin, leading to a faster obtainment of viscoelastic flow properties desired for thermoforming.
In a preferred embodiment, the present invention provides a polyolefin-based composition according to the first aspect of the invention, wherein said silicate mineral constitutes 0.1 to 30, more preferably 1 to 25, even more preferably 2 to 20, yet even more preferably 5 to 18 weight percent of said heat absorber composition. Said amounts of said silicate mineral are optimally suited to provide the heat absorber composition with a desired heat absorbing functionality.
In a preferred embodiment, the present invention provides a polyolefin-based composition according to the first aspect of the invention, wherein said heat absorber composition constitutes 0.1 to 20, more preferably 1 to 16, even more preferably 2 to 14, yet even more preferably 3 to 12, and yet even more preferably 5 to 10 weight percent of the composition. The heat absorber composition, included in the composition according to said amounts, improves the processability of the polyolefin-based composition according to the present invention most efficiently.
In a preferred embodiment, the present invention provides a polyolefin-based composition according to the first aspect of the invention, wherein said polyolefin is polypropylene. Polypropylene is especially suitable in the context of the present invention, seen its excellent barrier properties, temperature resistance, retortability, recyclability, processability and low cost. In a preferred embodiment, the present invention provides a polyolefin-based composition according to the first aspect of the invention, wherein said composition further comprises one or more additives selected from the group comprising oxidative and thermal stabilizers, lubricants, release agents, flame-retarding agents, oxidation inhibitors, oxidation scavengers, dyes, pigments and other coloring agents, ultraviolet light absorbers and stabilizers, organic or inorganic fillers, including particulate and fibrous fillers, reinforcing agents, nucleators, plasticizers, or any combination thereof. Representative ultraviolet light stabilizers include various substituted resorcinols, salicylates, benzotriazoles, benzophenones, and the like. Suitable lubricants and release agents include wax, stearic acid, stearyl alcohol, and stearamides. Exemplary flame-retardants include organic halogenated compounds, including decabromodiphenyl ether and the like as well as inorganic compounds. Suitable coloring agents 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 include the Period Table of Element's Group I metal halides, such as sodium halides, potassium halides, lithium halides; as well as cuprous halides; and further, chlorides, bromides, iodides. Also acceptable are hindered phenols, hydroquinones, aromatic amines as well as substituted members of those above mentioned groups and combinations thereof. Exemplary plasticizers include lactams such as caprolactam and lauryl lactam, sulfonamides such as o,p- toluenesulfonamide and N-ethyl, N-butyl benylenesulfonamide, and combinations of any of the above, as well as other plasticizers known to the art. In embodiments, said one or more additives may be chosen to fine-tune the properties of said polyolefin-based composition.
In a preferred embodiment, the present invention provides a polyolefin-based composition according to the first aspect of the invention, wherein, when thermal- molding, e.g. thermoforming, said composition, the shrinkage ratio of the composition is at most 3%, more preferably at most 2%, and yet even more preferably at most 1.2%, as measured by ASTM D955.
Said shrinkage ratio of the polyolefin-based composition according to the first aspect of the invention is much smaller than a shrinkage ratio of virgin polypropylene measured by ASTM D955, which can be situated between 15 and 30%. This low shrinkage ratio offers stable conditions when thermal-molding, e.g. thermoforming, said polyolefin-based composition.
In a second aspect, the current invention provides a method for producing a polyolefin-based composition, the method comprising the steps of:
- providing polyolefin; and
- blending cyclo-olefin copolymer of ethylene and norbornene, wherein said norbornene constitutes 42 to 58, preferably 45 to 55, more preferably 48 to 52 weight percent of said cyclo-olefin copolymer, into said polyolefin, thus obtaining said polyolefin-based composition.
In a preferred embodiment, the present invention provides a method according to the second aspect of the current invention, wherein said polyolefin is provided in an amount of 60 to 97 weight percent and wherein said cyclo-olefin copolymer of ethylene and norbornene is blended into said polyolefin in an amount of 3 to 15, more preferably 5 to 15, and even more preferably 10 to 15 weight percent, wherein said weight percentages are based on the total weight of said polyolefin- based composition. In a preferred embodiment, the present invention provides a method according to the second aspect of the current invention, wherein the method further comprises the step of additionally blending a heat absorber composition comprising polyolefin and silicate mineral into said polyolefin-based composition. In a preferred embodiment, the present invention provides a method according to the second aspect of the current invention, wherein said silicate mineral constitutes 0.1 to 30, more preferably 1 to 25, even more preferably 2 to 20, yet even more preferably 5 to 18 weight percent of said heat absorber composition. In a preferred embodiment, the present invention provides a method according to the second aspect of the current invention, wherein said heat absorber composition is blended into said polyolefin-based composition in an amount of 0.1 to 20, more preferably 1 to 16, even more preferably 2 to 14, yet even more preferably 3 to 12, and yet 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 according to the second aspect of the current invention, wherein said polyolefin is polypropylene.
For all technical effects and positive properties of a polyolefin-based composition produced by a method according to the second aspect of the invention, reference is made to the above description for the polyolefin-based composition according to the first aspect of the invention.
In another aspect, the current invention provides a use of a polyolefin-based composition for manufacturing a polyolefin-based molded product, said polyolefin- based composition comprising :
polyolefin; and
cyclo-olefin copolymer of ethylene and norbornene, wherein said norbornene constitutes 42 to 58, preferably 45 to 55, more preferably 48 to 52 weight percent of said cyclo-olefin copolymer.
Said polyolefin-based composition gives rise to molded products manufactured therefrom with excellent rigidity properties. Such excellent rigidity properties can be observed in molded products resulting from thermal-molding, e.g. thermoforming, said composition. At the same time, curling phenomena, e.g., gutter-like curling, or other undesired product deformations are negligible when thermal-molding, e.g. thermoforming, said composition. Besides, production times of such rigid polyolefin-based molded products are acceptable. As a result, said use of said polyolefin-based composition for manufacturing a polyolefin-based molded product facilitates the manufacturing of a much desired monolayer polyolefin alternative for mono- and/or multilayer polystyrene packaging products currently applied in the food industry.
Additionally, molded products manufactured from said polyolefin-based composition, such as molded products resulting from thermal-molding, e.g. thermoforming, said polyolefin-based composition, show excellent snapability. This is in particular of importance for packaging products that are provided in a clustered form, such as, for example, multipack containers for holding yoghurt. For a skilled person, it should be possible to acquire the components of said cyclo- olefin copolymer according to the current invention, and thus to obtain said specific copolymer and subsequently to obtain the polyolefin-based composition to be used in the use according to an aspect of the current invention.
In a preferred embodiment, the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said polyolefin constitutes 60 to 97 weight percent of the composition, and said cyclo-olefin copolymer of ethylene and norbornene constitutes 3 to 15, more preferably 5 to 15, and even more preferably 10 to 15 weight percent of the composition.
Said amounts of said polyolefin and said cyclo-olefin copolymer of ethylene and norbornene in the polyolefin-based composition have been found to be ideally suited to achieve very excellent rigidity properties in molded products manufactured therefrom, such as molded products resulting from thermal-molding, e.g. thermoforming, the composition. Additionally, said amounts have been found to lead to very excellent snapability in resulting molded products.
In a preferred embodiment, the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, further comprising a heat absorber composition comprising polyolefin and silicate mineral.
Said heat absorber composition improves the processability of the polyolefin-based composition according to the present invention. Inclusion of the heat absorber composition leads to reduced production times when manufacturing a molded product from said composition, in particular when thermal-molding said composition into a molded product. Also, said composition including the heat absorber composition leads to reduced production times when thermoforming said composition into a molded product.
Silicate mineral, defined above, is a material absorbing heat. It absorbs heat when thermal-molding, e.g. thermoforming, a polyolefin-based composition, enabling faster processing of said composition into desired polyolefin-based molded products. In particular, it has been found that the heat absorber composition comprising silicate mineral absorbs heat during heat contact steps in the initial stages of a thermoforming process. When said polyolefin and cyclo-olefin copolymer are subsequently heated during the thermoforming process, polyolefin will slowly pass into viscoelastic state while cyclo-olefin copolymer, in presence of the heat absorber composition, will faster pass into thermoform phase and pass heat to polyolefin since the cyclo-olefin copolymer molecules obtain some additional freedom of movement. Besides, the heat absorber composition will generally absorb heat and will be saturated quickly with said heat, which on its turn will be released quickly to the polyolefin, leading to a faster obtainment of viscoelastic flow properties desired for thermoforming. In a preferred embodiment, the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said silicate mineral constitutes 0.1 to 30, more preferably 1 to 25, even more preferably 2 to 20, yet even more preferably 5 to 18 weight percent of said heat absorber composition. Said amounts of said silicate mineral are optimally suited to provide the heat absorber composition with a desired heat absorbing functionality.
In a preferred embodiment, the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said heat absorber composition constitutes 0.1 to 20, more preferably 1 to 16, even more preferably 2 to 14, yet even more preferably 3 to 12, and yet even more preferably 5 to 10 weight percent of the composition. The heat absorber composition, included in the composition according to said amounts, improves the processability of the polyolefin-based composition according to the present invention most efficiently.
In a preferred embodiment, the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said polyolefin is polypropylene. Polypropylene is especially suitable in the context of the present invention, seen its excellent barrier properties, temperature resistance, retortability, recyclability, processability and low cost.
In a preferred embodiment, the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said composition further comprises one or more additives selected from the group comprising oxidative and thermal stabilizers, lubricants, release agents, flame-retarding agents, oxidation inhibitors, oxidation scavengers, dyes, pigments and other coloring agents, ultraviolet light absorbers and stabilizers, organic or inorganic fillers, including particulate and fibrous fillers, reinforcing agents, nucleators, plasticizers, or any combination thereof. Representative ultraviolet light stabilizers include various substituted resorcinols, salicylates, benzotriazoles, benzophenones, and the like. Suitable lubricants and release agents include wax, stearic acid, stearyl alcohol, and stearamides. Exemplary flame-retardants include organic halogenated compounds, including decabromodiphenyl ether and the like as well as inorganic compounds. Suitable coloring agents 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 include the Period Table of Element's Group I metal halides, such as sodium halides, potassium halides, lithium halides; as well as cuprous halides; and further, chlorides, bromides, iodides. Also acceptable are hindered phenols, hydroquinones, aromatic amines as well as substituted members of those above mentioned groups and combinations thereof. Exemplary plasticizers include lactams such as caprolactam and lauryl lactam, sulfonamides such as ο,ρ-toluenesulfonamide and N-ethyl, N-butyl benylenesulfonamide, and combinations of any of the above, as well as other plasticizers known to the art. In embodiments, said one or more additives may be chosen to fine-tune the properties of said polyolefin-based composition. In a preferred embodiment, the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein, when thermal-molding, e.g. thermoforming, said composition, the shrinkage ratio of the composition is at most 3%, more preferably at most 2%, and yet even more preferably at most 1.2%, as measured by ASTM D955.
Said shrinkage ratio is much smaller than a shrinkage ratio of virgin polypropylene measured by ASTM D955, which can be situated between 15 and 30%. This low shrinkage ratio offers stable conditions when thermal-molding, e.g. thermoforming, said polyolefin-based composition. In a preferred embodiment, the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said polyolefin-based molded product is a container suited for holding food and/or beverage products, and in particular a container for holding dairy products, or is an intermediate sheet intended for manufacturing such container. Such intermediate sheet and container are products which benefit optimally from the positive properties, including good snapability, of products manufactured by the use of a polyolefin-based composition according to an aspect of the invention.
In a preferred embodiment, the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said polyolefin-based molded product is suited for non-food applications. Non-limiting examples of non-food applications comprise the storage of cosmetic and pharmaceutical products, dishwashing or washing detergent and dry products.
In a preferred embodiment, the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein the manufacturing of said polyolefin-based molded product comprises the steps of:
heating said polyolefin-based composition at different ascending temperature levels in a first heating step;
heating said polyolefin-based composition at different ascending temperature levels in a second heating step; and
- forming said polyolefin-based composition to a specific shape in 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 current invention, wherein said first heating step corresponds to consecutively 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 speed of 16 to 30 cycles per minute. In a preferred embodiment, the present invention provides a use of a polyolefin-based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said second heating step corresponds to consecutively heating said composition at temperatures from 315 to 335 °C, and at temperatures from 335 to 355 °C, and at a cycle speed of 11 to 25 cycles per minute. Manufacturing of said polyolefin-based molded product according to said steps results in a polyolefin-based molded product with excellent rigidity properties, negligible curling phenomena, such as, e.g. gutter-like curling, or other undesired product deformations, and acceptable production times. A resulting polyolefin- based molded product can be used as a much desired monolayer polyolefin alternative for mono- and/or multilayer polystyrene packaging products currently applied in the food industry. Additionally, resulting polyolefin-based molded products show an excellent snapability, which is, for example, of particular importance for packaging products that are provided in a clustered form, such as, for example, multipack containers for holding yoghurt. Besides, said steps of heating and forming result in a shrinkage ratio of the molded product of at most 3%, more preferably at most 2%, and yet even more preferably at most 1.2%, as measured by ASTM D955. Said shrinkage ratio of the manufactured molded product is much smaller than a shrinkage ratio of a virgin polypropylene molded product measured by ASTM D955, which can be situated between 15 and 30%. This low shrinkage ratio offers stable manufacturing conditions when manufacturing a molded product.
In a preferred embodiment, the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, further comprising the step of trimming said polyolefin-based molded product. As a result, a trimmed polyolefin-based molded product is obtained, which form and size are fine-tuned for specific uses of the molded product. Non-limiting examples are containers which can be used for holding foods and/or beverages, like containers for holding yoghurt.
In a preferred embodiment, the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said heating in said first heating step at said different ascending temperature levels is performed by contact heating. In a preferred embodiment, the present invention provides a use of a polyolefin- based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said heating in said second heating step at said different ascending temperature levels is performed by radiation heating.
Said specific types of heating, i.e., contact heating and radiation heating, as well as the sequence thereof when manufacturing a polyolefin-based molded product according to a use according to an aspect of the present invention, contribute to the excellent snapability of such product.
In another aspect, the current invention provides a polyolefin-based molded product obtainable according to a use of a polyolefin-based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention. The specific characteristics and properties of such product can be understood from the description disclosed above.
In a preferred embodiment, the present invention provides a polyolefin-based molded product obtainable according to a use of a polyolefin-based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said product is a container suited for holding food and/or beverage products, and in particular a container for holding dairy products, or is an intermediate sheet intended for manufacturing such container. Such intermediate sheet and container are products which benefit optimally from the positive properties, including good snapability, which polyolefin-based molded products according to the present invention offer.
In a preferred embodiment, the present invention provides a polyolefin-based molded product obtainable according to a use of a polyolefin-based composition for manufacturing a polyolefin-based molded product according to an aspect of the invention, wherein said product is suited for non-food applications. Non-limiting examples of non-food applications comprise the storage of cosmetic and pharmaceutical products, dishwashing or washing detergent and dry products.
In another aspect, the current invention provides a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention. As will be clear from the description of the first aspect of the invention disclosed above, a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, enables the production of polyolefin-based molded products with high rigidity, good snapability and negligible curling phenomena, that can be used as a much desired monolayer polyolefin alternative for mono- and/or multilayer polystyrene packaging products currently applied in the food industry.
In a preferred embodiment, the present invention provides a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, comprising the steps of:
heating said polyolefin-based composition at different ascending temperature levels in a first heating step;
heating said polyolefin-based composition at different ascending temperature levels in a second heating step; and
- forming said polyolefin-based composition to a specific shape in a mold, resulting in a polyolefin-based molded product.
In a preferred embodiment, the present invention provides a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, wherein said first heating step corresponds to consecutively 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 speed of 16 to 30 cycles per minute. In a preferred embodiment, the present invention provides a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, wherein said second heating step corresponds to consecutively heating said composition at temperatures from 315 to 335 °C, and at temperatures from 335 to 355 °C, and at a cycle speed of 11 to 25 cycles per minute.
Subjecting a polyolefin-based composition according to the first aspect of the current invention to said steps of the method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, results in a polyolefin-based molded product with excellent rigidity properties, negligible curling phenomena, such as, e.g. gutter-like curling, or other undesired product deformations, and acceptable production times. As a result, said method enables the production of polyolefin-based molded products which can be used as a much desired monolayer polyolefin alternative for mono- and/or multilayer polystyrene packaging products currently applied in the food industry. Additionally, polyolefin-based products produced by said method show an excellent snapability, which is, for example, of particular importance for packaging products that are provided in a clustered form, such as, for example, multipack containers for holding yoghurt. Besides, said method steps of heating and forming according to a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, result in a shrinkage ratio of the molded product of at most 3%, more preferably at most 2%, and yet even more preferably at most 1.2%, as measured by ASTM D955. Said shrinkage ratio of the produced molded product, is much smaller than a shrinkage ratio of a virgin polypropylene molded product measured by ASTM D955, which can be situated between 15 and 30%. This low shrinkage ratio offers stable production conditions when producing a molded product.
In a preferred embodiment, the present invention provides a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, further comprising the step of trimming said polyolefin-based molded product. As a result, a trimmed polyolefin- based molded product is obtained, which form and size are fine-tuned for specific uses of the molded product. Non-limiting examples are containers which can be used for holding foods and/or beverages, like containers for holding yoghurt.
In a preferred embodiment, the present invention provides a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, wherein said heating in said first heating step at said different ascending temperature levels is performed by contact heating.
In a preferred embodiment, the present invention provides a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, wherein said heating in said second heating step at said different ascending temperature levels is performed by radiation heating.
Said specific types of heating, i.e., contact heating and radiation heating, as well as the sequence thereof when producing a polyolefin-based molded product according to a method of the present invention, contribute to the excellent snapability of such product.
In another aspect, the current invention provides a polyolefin-based molded product obtainable according to a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, or manufactured from a polyolefin-based composition according to the first aspect of the current invention. The specific characteristics and properties of such product can be understood from the description disclosed above.
In a preferred embodiment, the present invention provides a polyolefin-based molded product obtainable according to a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, or manufactured from a polyolefin-based composition according to the first aspect of the current invention, wherein said product is a container suited for holding food and/or beverage products, and in particular a container for holding dairy products, or is an intermediate sheet intended for manufacturing such container. Such intermediate sheet and container are products which benefit optimally from the positive properties, including good snapability, which polyolefin-based molded products according to the present invention offer.
In a preferred embodiment, the present invention provides a polyolefin-based molded product obtainable according to a method for producing a polyolefin-based molded product, by using a polyolefin-based composition according to the first aspect of the current invention, or manufactured from a polyolefin-based composition according to the first aspect of the current invention, wherein said product is suited for non-food applications. Non-limiting examples of non-food applications comprise the storage of cosmetic and pharmaceutical products, dishwashing or washing detergent and dry products. EXAMPLES
The invention is further described by the following non-limiting examples which further illustrate the invention, and are not intended to, nor should they be interpreted to, limit the scope of the invention.
EXAMPLE 1
A specific embodiment of the first aspect of the present invention is presented in Table 1, wherein a polypropylene-based composition is shown.
Table 1 Polypropylene-based composition according to an embodiment of the first aspect of the present invention
Figure imgf000021_0001
EXAMPLE 2
A specific embodiment of the first aspect of the present invention is presented in Table 2, wherein a polypropylene-based composition is shown. Table 2 Polypropylene-based composition according to an embodiment of the first aspect of the present invention
Weight percent (%)
Polypropylene 75-85
Cyclo-olefin copolymer of ethylene and 10-15
norbornene, wherein said norbornene
constitutes 50 weight percent of said
cyclo-olefin copolymer
heat absorber composition comprising 5-10 polyolefin and silicate mineral, wherein
said silicate mineral constitutes 10
weight percent of said heat absorber
composition
EXAMPLE 3
The polypropylene-based composition according to Example 1, as shown in Table 1, is first subjected to contact heating with temperature levels of 100, 125, 137 and 142 °C at heating plates placed above and below said composition (i.e. double heating), at a cycle speed of 18 cycles per minute, and is secondly subjected to radiation heating with temperature levels of 325 and 345 °C at different heating plates, at a cycle speed of 13 cycles per minute.
This results in a polypropylene-based molded product with excellent rigidity properties, negligible curling phenomena, such as, e.g. gutter-like curling, or other undesired product deformations, and acceptable production times. As a result, such polypropylene-based molded products can be used as a much desired monolayer polyolefin alternative for mono- and/or multilayer polystyrene packaging products currently applied in the food industry. Additionally, such polypropylene-based molded product shows an excellent snapability, which is, for example, of particular importance for packaging products that are provided in a clustered form, such as, for example, multipack containers for holding yoghurt. Besides, the polypropylene- based molded product shows a shrinkage ratio of only 1.0%, as measured by ASTM D955. Said shrinkage ratio is much smaller than a shrinkage ratio of virgin polypropylene measured by ASTM D955, which can be situated between 15 and 30%. This low shrinkage ratio of 1.0% offers stable conditions during thermal- molding, e.g. thermoforming.
EXAMPLE 4
The polypropylene-based composition according to Example 2, as shown in Table 2, is first subjected to contact heating with temperature levels of 100, 120, 130 and 140 °C at heating plates placed above and below said composition (i.e. double heating), at a cycle speed of 28 cycles per minute, and is secondly subjected to radiation heating with temperature levels of 325 and 345 °C at different heating plates, at a cycle speed of 23 cycles per minute.
This results in a polypropylene-based molded product with highly resembling properties compared to the product described in Example 3, while needing a shorter time to produce the product. The faster production time can be explained by the inclusion of the heat absorber composition.

Claims

1. A polyolefin-based composition comprising :
polyolefin; and
- cyclo-olefin copolymer of ethylene and norbornene, wherein said norbornene constitutes 42 to 58 weight percent of said cyclo-olefin copolymer.
2. Polyolefin-based composition according to claim 1, wherein said polyolefin constitutes 60 to 97 weight percent of the composition, and said cyclo-olefin copolymer of ethylene and norbornene constitutes 3 to 15 weight percent of the composition.
3. Polyolefin-based composition according to claim 1 or 2, further comprising a heat absorber composition comprising polyolefin and silicate mineral.
4. Polyolefin-based composition according to claim 3, wherein said silicate mineral constitutes 0.1 to 30 weight percent of said heat absorber composition.
5. Polyolefin-based composition according to claim 3 or 4, wherein said heat absorber composition constitutes 0.1 to 20 weight percent of the composition.
6. Polyolefin-based composition according to any of claims 1 to 5, wherein said polyolefin is polypropylene.
7. Polyolefin-based composition according to any of claims 1 to 6, wherein said composition further comprises one or more additives selected from the group comprising oxidative and thermal stabilizers, lubricants, release agents, flame-retarding agents, oxidation inhibitors, oxidation scavengers, dyes, pigments and other coloring agents, ultraviolet light absorbers and stabilizers, organic or inorganic fillers, including particulate and fibrous fillers, reinforcing agents, nucleators, plasticizers, or any combination thereof.
8. Polyolefin-based composition according to any of claims 1 to 7, wherein, when thermal-molding said composition, the shrinkage ratio of the composition is at most 3%, as measured by ASTM D955.
A method for producing a polyolefin-based composition, the method comprising the steps of:
providing polyolefin; and
blending cyclo-olefin copolymer of ethylene and norbornene, wherein said norbornene constitutes 42 to 58 weight percent of said cyclo- olefin copolymer, into said polyolefin, thus obtaining said polyolefin- based composition.
10. Method according to claim 9, wherein said polyolefin is provided in an amount of 60 to 97 weight percent and wherein said cyclo-olefin copolymer of ethylene and norbornene is blended into said polyolefin in an amount of 3 to 15 weight percent, wherein said weight percentages are based on the total weight of said polyolefin-based composition.
11. Method according to claim 9 or 10, wherein the method further comprises the step of additionally blending a heat absorber composition comprising polyolefin and silicate mineral into said polyolefin-based composition.
12. Method according to claim 11, wherein said silicate mineral constitutes 0.1 to 30 weight percent of said heat absorber composition.
13. Method according to claim 11 or 12, wherein said heat absorber composition is blended into said polyolefin-based composition in an amount of 0.1 to 20 weight percent, based on the total weight of said polyolefin-based composition.
14. Method according to any of claims 9 to 13, wherein said polyolefin is polypropylene.
PCT/EP2018/063056 2017-05-19 2018-05-18 Polyolefin-based composition and method for producing a polyolefin-based composition WO2018211059A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0504418A1 (en) * 1990-10-05 1992-09-23 Idemitsu Kosan Company Limited Process for producing cycloolefin polymer, cycloolefin copolymer, and composition and molding prepared therefrom
EP1245637A1 (en) * 1999-11-05 2002-10-02 Zeon Corporation Light-diffusing resin composition
US20080287614A1 (en) 2007-05-15 2008-11-20 Sonoco Development, Inc. Polypropylene-Based Polymer Blend of Enhanced Melt Strength

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0504418A1 (en) * 1990-10-05 1992-09-23 Idemitsu Kosan Company Limited Process for producing cycloolefin polymer, cycloolefin copolymer, and composition and molding prepared therefrom
EP1245637A1 (en) * 1999-11-05 2002-10-02 Zeon Corporation Light-diffusing resin composition
US20080287614A1 (en) 2007-05-15 2008-11-20 Sonoco Development, Inc. Polypropylene-Based Polymer Blend of Enhanced Melt Strength

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