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    • 6. 发明授权
    • Separator for battery
    • 电池分离器
    • US5824430A
    • 1998-10-20
    • US797298
    • 1997-02-07
    • Hiroyuki HiguchiKiichiro MatsushitaSoji Nishiyama
    • Hiroyuki HiguchiKiichiro MatsushitaSoji Nishiyama
    • B32B5/18B32B27/32H01M2/16
    • B32B27/32H01M2/1653Y10T428/249981
    • A separator for battery which exhibits a low electrical resistivity at normal time, good SD characteristics and a high mechanical strength is disclosed. A high molecular weight polypropylene having a weight average molecular weight of 500,000 or more and a polyethylene having a melting point of from 100.degree. to 140.degree. C. are extruded through a T-die film-forming machine to prepare a laminate film comprising a laminate of the high molecular polypropylene layer and the polyethylene layer. The laminate film is stretched at a temperature as low as from -20.degree. C. to 80.degree. C. by 10% to 100% based on the length of the original film, stretched at a temperature as high as 80.degree. C. to 130.degree. C. by 60% to 300% based on the length of the unstretched film, and then shrunk at the same temperature by 5% to 30% based on the length of the stretched film to render the film porous. Thus, a porous laminate film having a Gurley value of from 200 to 1,500 is prepared as a separator for battery.
    • 公开了一种在正常时间具有低电阻率,良好的SD特性和高机械强度的电池用隔膜。 将重均分子量为500,000以上的高分子量聚丙烯和熔点为100-140℃的聚乙烯通过T型模片成膜机挤出,制成层压膜, 的高分子量聚丙烯层和聚乙烯层。 基于原始膜的长度,将层压膜在低于-20℃至80℃的温度下拉伸10%至100%,在高达80℃的温度下拉伸至130 相对于未拉伸膜的长度为60〜300%,然后在相同温度下以相对于拉伸膜的长度缩短5〜30%,使膜变多孔。 因此,制备具有200〜1500的Gurley值的多孔层压膜作为电池用隔膜。