Dienophile additives to polyvinylidene chloride copolymers

B - Operations – Transporting – 32 – B

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B32B 27/18 (2006.01) B32B 27/30 (2006.01)

Patent

CA 2420891

A flexible film for packaging articles such as food is provided. The film comprises a layer of polyvinylidene ("PVdC") homopolymer, polyvinylidene and methyl acrylate ("PVdC-MA") copolymer or other polyvinylidene chloride copolymer. A dienophile such as, for example, ethyl trans-cinnamate, methyl transcinnamate, dibutyl maleate, dimethyl maleate or maleic anhydride is blended with the PVdC polymer or PVdC-MA copolymer to reduce yellowing of the film caused by degradation of the PVdC or PVdC-MA through heat or electron beam irradiation. Preferably a range of about .05 % and about 5 % by weight of the dienophile is added to the PVdC or PVdC-MA.

L'invention concerne un film flexible permettant d'empaqueter des articles tels que de la nourriture. Ce film comprend une couche d'homopolymère de polyvinylidène (PVdC), de copolymère de polyvinylidène et méthyle acrylate (PVdC-MA) ou d'un autre copolymère de chlorure de polyvinylidène. Un diénophile comme, par exemple, un éthyle trans-cinnamate, un méthyle trans-cinnamate, un dibutyle maléate, un diméthyle maléate ou un anhydride maléique est mélangé avec le polymère PVdC ou le copolymère PVdC-MA pour réduire le jaunissement du film provoqué par la dégradation du PVdC ou du PVdC-MA sous l'effet de la chaleur ou de l'exposition à des faisceaux d'électrons. De préférence, une quantité approximative comprise entre 0,05 % et 5 % en poids du diénophile est ajoutée au PVdC ou au PVdC-MA.

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