The present invention relates to a plastic film, which is particularly suitable for chub packaging. The film according to the present invention contains: a. at least one sealing layer, having at least one member of the group consisting of low density polyethylene, linear low density polyethylene, et
The present invention relates to a plastic film, which is particularly suitable for chub packaging. The film according to the present invention contains: a. at least one sealing layer, having at least one member of the group consisting of low density polyethylene, linear low density polyethylene, ethylene ester copolymers, ethylene alpha olefin copolymers, polypropylene copolymers or homopolymers, very low density polyethylene, polybutylene, styrene based copolymers, ionomers and ethylene methacrylic acid copolymers; b. at least one barrier layer, comprising polyvinylidene chloride polymers; c. at least one intermediate layer, comprising ethylene ester copolymers, ethylene ester polymers, chemically modified polyethylenes and/or chemically modified polypropylenes.
대표청구항▼
The invention claimed is: 1. A plastic film comprising: a. at least one sealing layer, comprising at least one member selected from the group consisting of low density polyethylene, linear low density polyethylene, ethylene ester copolymer, ethylene alpha olefin copolymer, polypropylene copolymer,
The invention claimed is: 1. A plastic film comprising: a. at least one sealing layer, comprising at least one member selected from the group consisting of low density polyethylene, linear low density polyethylene, ethylene ester copolymer, ethylene alpha olefin copolymer, polypropylene copolymer, polypropylene homopolymer, very low density polyethylene, polybutylene, styrene based copolymer, ionomer, ethylene methacrylic acid copolymer, and combinations thereof; b. at least one barrier layer, comprising polyvinylidene chloride polymers; c. one or more intermediate layers, comprising a member selected from the group consisting of ethylene ester copolymer, ethylene ester polymer, chemically modified polyethylene, chemically modified polypropylene, and combinations thereof; characterized in that said one or more intermediate layers comprises 70% by weight white TiO2 pigment. 2. A plastic film according to claim 1, characterized in that said sealing layer(s) include(s) additives in suitable amounts. 3. A plastic film according to claim 2, characterized in that said sealing layer(s) include(s) as said additives, slip agents, polymer processing agents or a combination thereof. 4. A plastic film according to claim 2, characterized in that said sealing layer(s) include(s) said additives in an amount of 1-10 wt.-%. 5. A plastic film according to claim 2, characterized in that said additives are 5% by weight of erucamide and 10% by weight of natural silica. 6. A plastic film according to claim 1, characterized in that said film is irradiated. 7. A plastic film according to claim 1, characterized in that said film is a coextruded film. 8. Process of chub packaging, comprising packaging a product with a film according to claim 1. 9. A chub package made from the film of claim 1. 10. A plastic film according to claim 1, wherein when the film has a thickness of about 67.5 to 68 microns, the film has an impact resistance of 450 grams, measured in accordance with ASTM D1709, but with the film chilled so that the film exhibits a measured surface temperature of 0�� C. 11. A plastic film according to claim 1, characterized in that said film has two outer sealing layers. 12. A plastic film according to claim 1, characterized in that said film has said one barrier layer. 13. A plastic film according to claim 1, characterized in that said film has two or more said intermediate layers. 14. A plastic film according to claim 1, characterized in that said film has 2-10 said intermediate layers. 15. A plastic film according to claim 1, characterized in that said film has 4-8 said intermediate layers. 16. A plastic film according to claim 1, characterized in that said film has 6 said intermediate layers. 17. A plastic film according to claim 1, characterized in that said one or more intermediate layers consist essentially of one or more ethylene ester polymers. 18. A plastic film according to claim 17, characterized in that said one or more intermediate layers consist essentially of one or more members selected from the group consisting of ethylene vinyl acetate copolymer, ethylene methyl acrylate copolymer, ethylene ethyl acrylate copolymer, ethylene methyl methacrylate copolymer, ethylene butyl acrylate copolymer and terpolymers of said polymers. 19. A plastic film according to claim 17, characterized in that said one or more intermediate layers consist essentially of an ethylene vinyl acetate copolymer. 20. A plastic film according to claim 17, characterized in that said one or more intermediate layers consist essentially of an ethylene methyl acrylate copolymer. 21. A plastic film according to claim 1, characterized in that said sealing layer consists essentially of an ethylene alpha-olefin copolymer that is a plastomer. 22. A plastic film according to claim 1, characterized in that said sealing layer consists essentially of an ethylene ester copolymer that is an ethylene-vinyl acetate copolymer. 23. A plastic film according to claim 1, characterized in that said sealing layer consists essentially of an ethylene alpha-olefin copolymer that is a plastomer and an ethylene ester copolymer that is an ethylene-vinyl acetate copolymer. 24. A plastic film according to claim 1, characterized in that said barrier layer consists essentially of one or more polyvinylidene chloride polymers selected from the group consisting of methyl acrylate-polyvinylidene chloride copolymer and vinylidene chloride copolymers. 25. A plastic film according to claim 1, characterized in that said barrier layer consists essentially of a methylacrylate-polyvinylidene chloride copolymer. 26. A plastic film, having the following structure: a. an outer heat sealing layer comprising: 74% by weight of an alpha-olefin plastomer copolymer, having a melting point of 99�� C., a density of 0.902 g/ml and a melt index of 1.0 g/10 min; 24% by weight of an ethylene-vinyl acetate copolymer, having a melt flow index of 0.35 g/10 min and 14% vinyl acetate; 2% by weight of slip additives and polymer processing aids; b. an adjacent intermediate layer, consisting of ethylene vinyl acetate copolymer, having 18% by weight vinyl acetate and a melt flow index of 0.7 g/10 min; c. an adjacent intermediate layer, consisting of ethylene vinyl acetate copolymer, having 25% by weight vinyl acetate and a melt flow index of 2 g/10 min; d. an adjacent intermediate layer, comprising 70% by weight of ethylene methyl acrylate copolymer, having 29% by weight methyl acrylate and a melt flow index of 3 g/10 min and 30% by weight of ethylene methyl acrylate copolymer, having 24% by weight-methyl acrylate and a melt flow index of 0.6 g/10 min; e. an adjacent barrier layer, consisting of methyl acrylate-polyvinylidene chloride copolymer, f. an adjacent intermediate layer, comprising 70% by weight of ethylene methyl acrylate copolymer, having 29% by weight methyl acrylate and a melt flow index of 3 g/10 min and 30% by weight of ethylene methyl acrylate copolymer, having 24% by weight methyl acrylate and a melt flow index of 0.6 g/10 min; g. an adjacent intermediate layer, consisting of ethylene vinyl acetate copolymer, having 25% by weight vinyl acetate and a melt flow index of 2 g/10 min; h. an adjacent intermediate layer, consisting of ethylene vinyl acetate copolymer, having 18% by weight VA and a melt flow index of 0.7 g/10 min; and i. an outer heat sealing layer, comprising: 74% by weight of an alpha-olefin plastomer copolymer, having a melting point of 99�� C., a density of 0.902 g/ml and a melt index of 1.0 g/10 min; 24% by weight of an ethylene-vinyl acetate copolymer, having a melt flow index of 0.35 g/10 min and 14% by weight vinyl acetate; 2% by weight of slip additives and polymer processing aids. 27. A plastic film according to claim 26, wherein when the film has a thickness of about 67.5 to 68 microns, the film has an impact resistance of 450 grams, measured in accordance with ASTM D1709, but with the film chilled so that the film exhibits a measured surface temperature of 0�� C.
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이 특허에 인용된 특허 (6)
Wilhoit Darrell L. (Joliet IL), Biaxially oriented heat shrinkable film.
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