Polymeric materials

Details Polymeric materials Polymeric materials

1977-09-12

1979-03-06

Esposito, Michael F.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Separator, retainer, spacer or materials for use therewith

210500M, 427115, 427322, 427336, 427430R, 427444, 427445, H01M 216

Patent

active

041432185

ABSTRACT:
A method of treating a hydrophilic polymer film is described in which the film is immersed at a temperature greater than 80.degree. 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.

REFERENCES:
patent: 3035110 (1962-05-01), Corren
patent: 3427206 (1969-02-01), Scardaville
patent: 3497072 (1970-02-01), Cannon
patent: 3536796 (1970-10-01), Rock
patent: 3720321 (1973-03-01), Coughlin
patent: 3892594 (1975-07-01), Charlesby
patent: 3912834 (1975-10-01), Imai

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