Separator material for storage batteries and method for making the same
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United States of America Patent
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Apr 20, 1993
Grant Date -
N/A
app pub date -
Mar 25, 1991
filing date -
Mar 26, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Conjugate fibers using, as a surface component, ethylene copolymer containing a unit represented by a formula --CH.sub.2 --CH(COOH)--, and using, as a core component, polypropylene or like polyolefin fibers, are used to obtain thermally bonded non-woven fabric sheet to the treated with concentrated sulfuric acid or the like. By so doing, it is possible to readily introduce sulfo groups to replace tertiary carbon and thus impart the fibers with hydrophilicity. By using thus sulfonated thermal bonded non-woven fabric sheet as alkaline storage battery separators, it is possible to maintain high discharge capacity retention.
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