Improved structures of polymers made from single site catalysts

Details Improved structures of polymers made from single site catalysts Improved structures of polymers made from single site catalysts

C - Chemistry, Metallurgy

08

F

C08F 4/76 (2006.01) B29D 7/01 (2006.01) B32B 27/08 (2006.01) B65D 30/02 (2006.01) B65D 30/10 (2006.01) C08J 5/18 (2006.01) B29C 55/00 (2006.01)

Patent

CA 2166188

Copolymers of ethylene and alpha olefins that have been formed by a polymerization reaction in the presence of a single site catalyst, such as metallocene, are used as a film or as a layer in multiple layer films, including molecularly oriented and irradiated heat shrinkable films. Novel blends of the copolymers with other polymeric materials are disclosed and used as a film or a layer in a film particularly in molecularly oriented and heat shrinkable films. Bags made from the multiple layer films are especially useful for shrink packaging primal cuts of meat. Processes for the formation of flexible films and packages made therefrom are also disclosed.

Copolymères d'éthylène et d'alpha oléfines qui ont été formés par une réaction de polymériastion en présence d'un catalyseur à site unique, tel qu'un alliage organométallique et qui sont utilisés comme film ou comme couche dans des films à couches multiples, dont des films thermorétrécissables moléculairement orientés et irradiés (12, 14, 16). De nouveaux mélanges desdits copolymères avec d'autres matériaux polymères sont décrits et utilisés en tant que film ou de couche dans un film, en particulier dans des films moléculairement orientés et thermorétrécissables. Les sacs produits à partir desdits films à couches multiples sont particulièrement utiles pour l'emballage par rétraction de quartiers de viande. Des procédés de formation desdits films souples et des emballages fabriqués à partir desdits films sont également décrits.

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