Microporous polyolefin membrane, and method of producing the...

Details Microporous polyolefin membrane, and method of producing the... Microporous polyolefin membrane, and method of producing the...

2008-12-12

2010-10-19

Wu, David (Department: 1796)

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

C429S144000, C429S254000, C264S210400, C264S211190, C264S235800, C210S500210, C210S500270, C210S500420, C521S079000, C428S212000

Reexamination Certificate

active

07815825

ABSTRACT:
The present invention provides a microporous polyolefin membrane of high permeability and novel structure, and also provides a method of producing the same, wherein its average pore size is gradually decreases from at least one membrane surface towards its center. The method of producing the microporous polyolefin membrane comprises the steps of extruding the solution, composed of 10 to 50 weight % of (A) a polyolefin having a weight-average molecular weight of 5×105 or more or (B) a composition containing this polyolefin and 50 to 90 weight % of a solvent, into a gel-like formed article and removing the solvent therefrom, wherein a treatment step with a hot solvent is incorporated.

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Japanese Office Action dated Oct. 6, 2009, with partial English translation.

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