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发明授权
CN100577270C 多孔膜、其制备方法和应用 有权

多孔膜、其制备方法和应用
摘要：
公开了由包含乙烯-α-烯烃共聚物(A)的聚烯烃树脂制成的多孔膜，所述乙烯-α-烯烃共聚物(A)包含源自乙烯的结构单元和源自一种或多种选自4-8个碳原子的α-烯烃的单体的结构单元，并且其满足下述条件：(I)：特性粘度[η]为9.0-15.0dl/g；(II)：熔点Tm不低于115℃但低于130℃；(III)：包括在乙烯-α-烯烃共聚物(A)中的冷二甲苯可溶组分的含量为3重量%或更低；和(IV)Tm≤0.54×[η]+114。还公开了包括该多孔膜的电池隔离体和该多孔膜的制备方法。
摘要（英）：

Disclosed is a porous film formed of a polyolefin resin comprising an ethylene-alpha-olefin copolymer (A) which comprises structural units originating from ethylene and structural units originating from one or more sorts of monomers selected from alpha-olefins having 4-8 carbon atoms and which satisfies the requirements (I) the intrinsic viscosity [eta] is 9.0 to 15.0 dl/g; (II) the melting point Tm is not lower than 115 DEG C. but lower than 130 DEG C.; (III) the content of cold-xylene-soluble components included in the ethylene-alpha-olefin copolymer (A) is 3% by weight or less; and (IV) Tm<=0.54x[eta]+114. A battery separator including the porous film and a method for the preparation of the porous film are also disclosed.

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