Polymeric materials

Details Polymeric materials Polymeric materials

B - Operations, Transporting

01

D

18/1182, 18/24

B01D 67/00 (2006.01) C08J 7/02 (2006.01) C08J 9/28 (2006.01)

Patent

CA 1102988

ABSTRACT OF THE DISCLOSURE A method of treating a hydrophilic polymer film is described in which the film is immersed at a temperature greater than 80°C, and preferably greater than the crystalline melting point of the polymer, in a liquid capable of swelling the polymer. Polymers to which this method can be applied include graft copolymers of for example polyethylene, polypropylene, polytetrafluoroethylene, and nylon with acrylic or methacrylic acid. The films when treated have decreased electrical resistance and increased hydroxyl ion permeability and are then useful as battery separators and in other semi permeable membrane applications.

286596

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