Title: Battery separator and method for battery separation

Abstract: 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 decigrex in an amount of not less than 3 parts by weight per 100 parts by weight of fibers (A) and (C) inert filter 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 separator 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.degree. C. lower than the melting point of the fibers (A) and (B) to a point about 50.degree. C. higher than the melting point.

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Inventors: Miura, Yoshikazu (Ichihara, JP)
Ichikura, Yoshifumi (Ageo, JP)

Application Number: 945293
Filing Date: 1978-09-25
Publication_date: 1980-05-27
Assignee: Mitsui Petrochemical Industries, Ltd. (Tokyo, JP)
Primary Class(es): 429/144 29/623.1, 429/252, 429/254
Other Classes:
US Patent Ref:

2482062	Sep, 1949	Hanson	429/254.
2734095	Feb, 1956	Mears et al.	429/252.
3085126	Apr, 1963	Labino	429/247.
3811957	May, 1974	Buntin	429/143.
4007059	Feb, 1977	Witherspoon et al.	429/251.
4137377	Jan, 1979	McClelland	429/145.

Other Refs: 7509458

Oct, 1974	NL

Primary Examiner: Walton, Donald L.
Assistant Examiner:
Attorney: Sherman & Shalloway