Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1992-09-01
1994-10-11
Ryan, Patrick J.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
428357, 428358, 428365, 428373, 428374, 428398, 429249, 429250, 429251, 429252, C08F22806, H01M 216, B32B 1500, B22B 300
Patent
active
053546172
ABSTRACT:
The invention is to a non-woven fabric sheet for a storage battery separator. The sheet has an excellent property of holding electrolyte by using conjugate fibers having a specific sectional form. The sheet comprises an ethylene copolymer having a specific structure which can introduce a desirable amount of sulfo groups efficiently under mild reaction conditions. Conjugate fibers having a split sectional form include a first component and a second component having a radial arrangement. The conjugate fibers are obtained by forming an ethylene based random copolymer containing a unit represented by a formula --CH.sub.2 CH(COOH)--, with polypropylene. Subsequently, a non-woven fabric sheet of a thermally bonding type is obtained by mixing the conjugate fibers with polypropoylene fibers. Subsequently, a non-woven fabric sheet for a storage battery separator is obtained by sulfonating the non-woven fabric sheet using gas such as SO.sub.3 to form a unit of the formula --CH.sub.2 C(SO.sub.3 H)(COOH)--.
REFERENCES:
patent: 3998871 (1976-12-01), Carlson
patent: 4110143 (1978-08-01), Cogliano et al.
patent: 4384032 (1983-05-01), Tashiro et al.
Ikeda Kazuhiro
Ikkanzaka Isao
Takai Yousuke
Daiwabo Create Co.
Kanai Juyo Kogyo Co. Ltd.
Ryan Patrick J.
Weisberger Richard P.
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