Method of making formulated plastic separators for soluble elect

Details Method of making formulated plastic separators for soluble elect Method of making formulated plastic separators for soluble elect

1977-11-03

1982-01-05

Lawrence, Evan K.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 53, 264216, 427115, 427244, 427246, B29H 720

Patent

active

043093728

ABSTRACT:
A method of making a membrane comprised of a hydrochloric acid-insoluble sheet of a mixture of a rubber and a powdered ion transport material is disclosed. The sheet can be present as a coating upon a flexible and porous substrate. These membranes can be used in oxidation-reduction electrical accumulator cells wherein the reduction of one member of a couple is accompained by the oxidation of the other member of the couple on the other side of the cell and this must be accompained by a change in chloride ion concentration in both sides. The method comprises preparing a mixture of fine rubber particles, a solvent for the rubber and a powdered ion transport material. The mixture is formed into a sheet and dried to produce a microporous sheet. The ion transport material includes particles ranging from about 0.01 to 10 microns in size and comprises from 20 to 50 volume percent of the microporous sheet.

REFERENCES:
patent: 3730872 (1973-05-01), Marze
patent: 3996064 (1976-12-01), Thaller
Helfferich, Ion Exchange, McGraw Hill (1962), pp. 62 and 63.

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