Polyolefin battery separator

Details Polyolefin battery separator Polyolefin battery separator

H - Electricity

01

M

319/58

H01M 2/16 (2006.01) H01M 2/14 (2006.01)

Patent

CA 1138032

99999999999+6 ABSTRACT A battery separator is provided that has 30-70% polyolefin synthetic pulp, 15-65% siliceous filler and 1-35% by weight of long fibers having lengths of between 1/4 and 1 inch. The long fibers may be polyester fibers or glass fibers or a mixture. Cellulose may be included in an amount up to about 10%. A process for forming the battery separator is also revealed using standard paper making equipment but employing ionic copolymers contain- ing acrylamide in cationic and anionic combination to give good affinity of the siliceous material and polyolefin. Alum and other processing aids are also included as are other procedural steps such as pressing the web.

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