Process for preparing microporous polyethylene film

Details Process for preparing microporous polyethylene film Process for preparing microporous polyethylene film

C - Chemistry, Metallurgy

08

J

18/33

C08J 9/00 (2006.01) B01D 67/00 (2006.01) B29C 55/00 (2006.01) B29C 55/06 (2006.01) B29C 55/08 (2006.01) C08J 5/18 (2006.01) H01M 2/16 (2006.01)

Patent

CA 1312431

71033-45 ABSTRACT OF THE DISCLOSURE An improved process for the production of a micro- porous polyethylene film by annealing, cold stretching and hot stretching a non-porous crystalline, elastic polyethylene film, whereby the permeability of the resultant film is improved by controlling both the stretching rates during cold and hot stretching and the sum of the changes in length during each stretching step.

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