Battery diaphragm and battery using same

Application Number: 00108570
Application Date: 2000.05.15
Publication Number: 1294416
Publication Date: 2001.05.09
Priority Information: 1999/11/2 JP 312084/99
International: H01M2/16;H01M10/30
Applicant(s) Name: Daiwa Boseki Co., Ltd.
Inventor(s) Name: Yamamoto Hiroyuki;Sano Toyohiro;Hori Shuji
Patent Agency Code: 72001
Patent Agent: cao wen
Abstract A battery separator comprises: a divided compound fiber (A), a polyolefine compound fiber (B), as the necessary components, and, optionally, a non-woven fabric of a third synthetic fiber (C). Based on 100 weight % of the total amount of the constituent fibers, each of the divided compound fiber (A) or the polyolefine compound fiber (B) shall not exceed 60 weight %. Furthermore, the non-woven fabric has been subjected to a hydrophilic treatment. The divided compound fiber (A) comprises a methyl pentene polymer (formed of poly (4-methylpentene-1) or 4-methylpentene-1 and other olefine polymer) as a first component and a polyolefine polymer different from the first component or its copolymer as a second component. The second component is interleaved and adjacent to each other in fiber cross-section. Furthermore, at least one component in the second component is divided into more than one. The polyolefine compound fiber (B) comprises a high melting point component and a low melting point component.