发明名称 Microporous films
摘要 A microporous polymeric film of high porosity comprises a halopolymer in which the repeating units are -(CnH2n)- and -(CmX2m)- in which each X independently represents fluorine or chlorine and the values of n and m are greater than one and less than six. The film is the result of firstly melt processing a mixture of the halopolymer, more than 150 parts by weight of an extractable salt and not more than 80 parts by weight of an extractable polymer per 100 parts by weight of the halopolymer, the extractable polymer not being completely and homogeneously mixed with the halopolymer and being less viscous than the halopolymer when both are molten so that the surfaces of the film resulting from melt processing are rich in the extractible polymer, and secondly extracting at least some of the extractable salt to render the film porous and extracting at least some of said polymer to impart surface porosity to the film. The film has a porosity of more than 50% by volume and more usually 60-70%. The film may be used as the separator of an electrochemical cell e.g. a battery having a lithium anode and a thionyl chloride electrolyte.
申请公布号 US5198162(A) 申请公布日期 1993.03.30
申请号 US19890367740 申请日期 1989.06.13
申请人 SCIMAT LIMITED 发明人 PARK, GEORGE B.;COOK, JOHN A.;DORLING, MIKE G. L.;BARKER, DAVID J.;MCLOUGHLIN, ROBERT H.
分类号 C08J9/26;C25B13/08;H01M2/16 主分类号 C08J9/26
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