Oriented, propylene polymer film with improved oxygen...

C - Chemistry – Metallurgy – 08 – J

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C08J 5/18 (2006.01) C08L 23/10 (2006.01) C08L 51/06 (2006.01)

Patent

CA 2326808

Disclosed is oriented, propylene polymer film, the oxygen barrier property of which is substantially improved. The improvement is achieved by incorporating in the propylene polymer composition from which the film is made grafted copolymer material comprising predominantely crystalline, propylene polymer material, the polymer or polymers of which have grafts of polymerized monomer material of a group that includes styrene, p-alkylstyrenes, acrylic acid, alkacrylic acids, alkyl alkacrylates, acrylonitrile and, with or without ethylene, vinyl acetate.

Cette invention se rapporte à un film en polymère de propylène orienté, dont la propriété de barrière à l'oxygène est considérablement améliorée. On obtient cette amélioration en incorporant dans la composition de polymère de propylène à partir de laquelle est fabriqué ledit film un matériau copolymère greffé renfermant essentiellement un matériau polymère de propylène cristallin, dont le ou les polymères possèdent des greffes d'un matériau monomère polymérisé d'un groupe constitué par du styrène, des p-alkylstyrènes, de l'acide acrylique, des acides alcacryliques, des alcacrylates d'alkyle, de l'acrylonitrile et, avec ou sans éthylène, de l'acétate de vinyle.

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