Solvent stretch process for preparing microporous films from...

Details Solvent stretch process for preparing microporous films from... Solvent stretch process for preparing microporous films from...

C - Chemistry, Metallurgy

08

J

18/19

C08J 9/36 (2006.01) C08J 9/28 (2006.01)

Patent

CA 1131862

Abstract of the Disclosure Microporous films having improved morphological structure are prepared by the "solvent stretch" method from an olefinic precursor film having a controlled crystalline structure. The crystalline structure of the precursor film is controlled by preparing said film from an olefinic cry- stalline homopolymer characterized as having a melt index of about 3 to 20 in the absence of a nucleating agent and a molecular weight distribution ratio of about 3.8 to about 13. In another embodiment the crystalline structure of the precursor film is controlled by incorporating a nucleating agent into the crystalline polymer resin from which the precursor film is prepared which thereby permits a reduction in the melt index of the polymer to about 0.3.

352780

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