Puncture resistant, high shrink films, blends, and process

Details Puncture resistant, high shrink films, blends, and process Puncture resistant, high shrink films, blends, and process

C - Chemistry, Metallurgy

08

L

C08L 23/08 (2006.01) B32B 27/32 (2006.01) C08J 5/18 (2006.01) C08L 31/02 (2006.01) C08L 33/06 (2006.01) B29C 55/28 (2006.01)

Patent

CA 2288541

A polymer blend and mono-and multilayer films made therefrom having an improved combination of properties such as high shrinkage values and high puncture resistance wherein the blend has a first copolymer of ethylene and octene-1 having a copolymer melting point of from 55 to 95°C, preferably of from 80 to 92°C; a second copolymer of ethylene and at least one .alpha.-olefin having a copolymer melting point of from 115 to 128°C: and a third copolymer of ethylene and a vinyl ester or alkyl acrylate and having a melting point of from 60 to 110°C, and a process for making such films, which preferably have at least 45% shrinkage at 90°C in at least one direction.

Mélange de polymères, et pellicules monocouche et multicouches faites de ce mélange, possédant une combinaison améliorée de propriétés telles qu'un taux de retrait élevé et une résistance élevée à la perforation, dans lesquelles le mélange contient un premier copolymère d'éthylène et d'octène-1 dont le point de fusion se situe entre 55 et 95 degrés Celsius, idéalement entre 80 et 92 degrés Celsius, un second copolymère d'éthylène et d'au moins un alpha-oléfine, copolymère dont le point de fusion se situe entre 115 et 128 degrés Celsius, et un troisième copolymère d'éthylène et d'ester vinylique ou d'acrylate d'alkyle ayant un point de fusion entre 60 et 110 degrés Celsius. Procédé pour la préparation de telles pellicules, dont le taux de retrait est idéalement d'au moins 45 % à 90 degrés Celsius dans au moins une direction.

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