Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Separator – retainer or spacer insulating structure
Patent
1980-01-18
1981-04-14
Levin, Stanford M.
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Separator, retainer or spacer insulating structure
429 27, 429 28, 429249, 429253, 264104, 264105, 525 61, C08F 828, H01M 200, H01M 216, H01M 218
Patent
active
042620678
ABSTRACT:
A method of producing a cross-linked polyvinyl alcohol structure, such as a battery separator membrane or electrode envelope. An aqueous solution of a film-forming polyvinyl alcohol is admixed with an aldehyde cross-linking agent at basic pH to inhibit cross-linking. The cross-linking agent, preferably a dialdehyde such as glutaraldehyde, is used in an amount of from about 1/2 to about 20% of the theoretical amount required to cross-link all of the hydroxyl groups of the polymer. The aqueous admixture is formed into a desired physical shape, such as by casting a sheet of the solution. The sheet is then dried to form a self-supporting film. Cross-linking is then effected by immersing the film in aqueous acid solution. The resultant product has excellent properties for use as a battery separator, including a low electrical resistivity, the value of which is principally determined by the amount of cross-linking which is easily and closely controlled by the amount of cross-linking agent added to the polymer.
REFERENCES:
patent: 2169250 (1939-08-01), Izard
patent: 3034999 (1962-05-01), Wilson
Hsu Li-Chen
Philipp Warren H.
Sheibley Dean W.
Levin Stanford M.
Mackin James A.
Manning John R.
Musial Norman T.
The United States of America as represented by the Administrator
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