POLYMERIC MATERIALS

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 in...

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Bibliographic Details
Main Authors PARTRIDGE, GORDON, RINGROSE, BARBARA J, ADAMS, LIONEL B, LOVELL, KEITH V
Format Patent
LanguageEnglish
French
Published 16.06.1981
Subjects
AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G
AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
BASIC ELECTRIC ELEMENTS
CHEMISTRY
COMPOSITIONS BASED THEREON
ELECTRICITY
GENERAL PROCESSES OF COMPOUNDING
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
SEPARATION
SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR
SHAPING OR JOINING OF PLASTICS
THEIR PREPARATION OR CHEMICAL WORKING-UP
TRANSPORTING
WORKING OF PLASTICS
WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
WORKING-UP
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Summary: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.
Bibliography:Application Number: CA19770286596