Polyolefin microporous film

Details Polyolefin microporous film Polyolefin microporous film

2006-07-27

2011-11-15

Nutter, Nathan M (Department: 1765)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S240000, C524S515000, C521S064000, C521S142000, C521S143000, C429S247000

Reexamination Certificate

active

08058348

ABSTRACT:
A polyolefin microporous film comprising polyethylene and polypropylene having a viscosity average molecular weight of 100,000 or higher, the polypropylene being contained in an amount of 4 wt % or more and the terminal vinyl group concentration per 10,000 carbon atoms in the polyolefin constituting the microporous film being 2 or more as measured by infrared spectroscopy. The microporous film has both of a good film breaking resistance and a low thermal shrinkage, is excellent in fuse property, and has a uniform film thickness. Particularly, the microporous film can retain safety in the oven safety test at 150° C. for a battery which is required for use as a lithium ion battery separator.

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Molecular Weight, Polymer Science Learning Center, Department of Polymer Science, The University of Southern Mississippi http//:pslc.ws/mactest/weight.htm.

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