Biaxially oriented polyethylene films

Details Biaxially oriented polyethylene films Biaxially oriented polyethylene films

C - Chemistry, Metallurgy

08

J

C08J 5/18 (2006.01)

Patent

CA 2239549

Articles and films are provided from ethylene-based polymers made using a metallocene catalyst system. Biaxial orientation dramatically improves clarity, stiffness, dart drop impact, puncture resistance, and shrink. Tensile strength at yield and ultimate tensile are also improved. Film stiffness, as measured by secant modulus, is increased by 300 % over an unoriented film of the same ethylene polymer. These articles and films are useful as shrink wrap, overwrap, and for dry packaging applications such as snacks and cereals as well as non-packaging applications such as photograph and document holders.

L'invention se rapporte à des articles et à des film obtenus à partir de polymères à base d'éthylène fabriqués au moyen d'un système catalyseur d'alliage organométallique. L'orientation biaxiale améliore spectaculairement la transparence, la rigidité, la résistance au choc au mouton, la résistance au percement, et le rétrécissement. La résistance à la traction et la tension de rupture sont également améliorées. La rigidité du film, telle que mesurée par le module sécant, est augmentée de 300 % sur un film non orienté du même polymère d'éthylène. Ces articles et ces films sont utilisés comme emballages moulants, surenveloppes et dans des applications d'emballage à sec tels que des sandwichs et des céréales ainsi que dans des applications sans emballage telles que des albums photos ou porte-documents.

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