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Patent Searching and Data


Title:
METHOD FOR FORMING MICROPOROUS POLYOLEFIN MEMBRANE AND APPLICATION THEREOF
Document Type and Number:
WIPO Patent Application WO/2012/048503
Kind Code:
A1
Abstract:
Disclosed is a method for forming microporous polyolefin membrane, which comprises the following steps: melt extruding polypropylene and casting into film at 180-260℃ to obtain polyolefin casting base membrane; stretching the polyolefin casting base membrane in machine direction at 10-150℃, so as to obtain primary microporous polyolefin membrane with micropores; performing thermoforming treatment to said primary microporous polyolefin membrane at 110-150℃, and stretching the primary microporous polyolefin membrane in transverse direction to obtain said microporous polyolefin membrane. The application of the method for forming microporous polyolefin membrane in the preparation of separators or lithium ion battery is also provided. In this method, on the basis that the primary microporous membrane is obtained through stretching longitudinally, it is further stretched in transverse direction at a preset tempreture to make the pores of the microporous polyolefin membrane round and bigger, so as to improve the ventilation property of the microporous polyolefin membrane and increase the transverse strength of the microporous membrane.

Inventors:
CHEN XIUFENG (CN)
CHEN LIANG (CN)
LEI CAIHONG (CN)
GAO DONGBO (CN)
Application Number:
PCT/CN2010/080329
Publication Date:
April 19, 2012
Filing Date:
December 27, 2010
Export Citation:
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Assignee:
SHENZHEN SENIOR TECHNOLOGY MATERIAL CO LTD (CN)
CHEN XIUFENG (CN)
CHEN LIANG (CN)
LEI CAIHONG (CN)
GAO DONGBO (CN)
International Classes:
B29C55/02; B29C39/00; B29C49/08; B29C69/02; B29C71/02; B29D7/01; H01M50/406
Foreign References:
CN101695869A2010-04-21
CN101384409A2009-03-11
US5134174A1992-07-28
CN1891444B2010-06-16
CN100388533C2008-05-14
CN101724168A2010-06-09
CN1233051C2005-12-21
Attorney, Agent or Firm:
SHENZHEN ZHONGYI PATENT AND TRADEMARK OFFICE (CN)
深圳中一专利商标事务所 (CN)
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Claims: