Method of making a composite microporous membrane

Details Method of making a composite microporous membrane Method of making a composite microporous membrane

B - Operations, Transporting

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B01D 69/12 (2006.01) B01D 67/00 (2006.01) B01D 71/06 (2006.01) B05D 3/12 (2006.01) B29C 55/02 (2006.01) B29C 67/20 (2006.01) C08J 9/00 (2006.01)

Patent

CA 2496079

A method of making a composite microporous membrane includes the steps of: coating a nonporous precursor film with a polymer composition, and then stretching the coated nonporous precursor. Stretching includes a first stretching conducted at a first temperature and a first stretching rate and a second stretching conducted at a second temperature and a second stretching rate. The first stretching rate and the second stretching rate are different.

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