Porous biaxially-oriented film comprising high molecular...

Details Porous biaxially-oriented film comprising high molecular... Porous biaxially-oriented film comprising high molecular...

C - Chemistry, Metallurgy

08

J

C08J 9/36 (2006.01) B01D 67/00 (2006.01) B29C 55/00 (2006.01) C08J 5/18 (2006.01) C08J 9/26 (2006.01) H01M 2/16 (2006.01)

Patent

CA 2149379

A porous biaxially oriented film comprising a copolymer of an ethylene having an intrinsic viscosity [? ] of from 3.5 to 10.0 dl/g and an .alpha.-olefin having 4 to 8 carbon atoms, the content of the .alpha.-olefin being in a number of from 1.0 to 7.5 per 1000 carbon atoms and the film retaining the structure which is based upon the microfibrils when it is heat-treated at 160 °C under a constrained state and is then observed at room temperature, and a separator made of this film for batteries. The porous biaxially oriented film exhibits excellent gas permeating property over a practicable temperature range, exhibits excellent mechanical strength and, particularly, tensile strength, and loses gas permeating property when a maximum practicable temperature is exceeded. The film can be favorably used as a separator for batteries.

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