In situ self cross-linking of polyvinyl alcohol battery separato

Details In situ self cross-linking of polyvinyl alcohol battery separato In situ self cross-linking of polyvinyl alcohol battery separato

1978-04-19

1979-05-15

Levin, Stanford M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

429253, 526 9, C08F 828

Patent

active

041549120

ABSTRACT:
A battery separator is produced from a polyvinyl alcohol sheet structure which is subjected to an in situ, self cross-linking process by selective oxidation of the 1,2 diol units present in the polyvinyl alcohol sheet structure. The 1,2 diol units are cleaved to form aldehyde end groups which subsequently cross-link through acetalization of the 1,3 diol units of the polyvinyl alcohol. Selective oxidation is achieved using a solution of a suitable oxidizing agent such as periodic acid or lead tetraacetate.

REFERENCES:
patent: 2983759 (1961-05-01), Matsumoto et al.
patent: 3052662 (1962-09-01), Shiraishi et al.
patent: 3379703 (1968-04-01), Ehmann et al.
Poly(vinylalcohol), Pritchard, J. G., (1970), pp. 85 & 86.

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