Heat resistant microporous film

Details Heat resistant microporous film Heat resistant microporous film

2000-10-20

2009-12-22

Chang, Victor S (Department: 1794)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

C428S315500, C428S316600, C264S028000, C264S041000, C264S049000

Reexamination Certificate

active

07635513

ABSTRACT:
A heat resistant microporous membrane containing a thermoplastic resin having a crystalline melting point of 140-300° C. and having a layer structure formed in the direction of membrane thickness, said layer structure containing 5-100% of a layer defined by the following (A) and 95-0% of a layer defined by the following (B):(A) a layer in which the micropores are intra-spherulitic voids, and(B) a layer in which the micropores are intra-spherulitic voids and inter-spherulitic voids.

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