Battery separator of olefinic-flash spun fibers

Details Battery separator of olefinic-flash spun fibers Battery separator of olefinic-flash spun fibers

H - Electricity

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M

319/58

H01M 2/16 (2006.01) D04H 1/56 (2006.01) H01M 2/14 (2006.01)

Patent

CA 1119661

ABSTRACT OF THE DISCLOSURE A battery separator of reduced electric resistance comprising a self-supporting non-woven mat consisting essentially of a mixture of (A) olefinic resin fibers having a coarseness of from 4 to 13 decigrex, (B) olefinic resin fibers having a coarseness of less than 4 deci- grex in an amount of not less than 3 parts by weight per 100 parts by weight of fibers (A) and (C) inert filler materials in an amount of 0 to about 600 parts by weight per 100 parts by weight in total fibers (A) and (B). The battery sep- arator is produced by subjecting an aqueous dispersion of said mixture to a sheet-forming operation; drying the resulting wet non-woven mat; and heat- treating the dried mat at a temperature ranging from a point 20°C lower than the melting point of the fibers (A) and (B) to a point about 50°C higher than the melting point.

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