| 摘要 |
PROBLEM TO BE SOLVED: To obtain a microporous membrane ensuring a low pore blocking temp., having required strength and fit for the separator of an org. solvent-contg. battery while suppressing breaking at the time of production. SOLUTION: This microporous membrane consists of 10-50wt.% ultrahigh mol.wt. polyethylene having a viscosity average mol.wt. of >=1,000,000, 10-50wt.% polyethylene copolymer having 0.05 to <2mol%α-olefin content and 35-70wt.% polyethylene copolymer having 2-8mol%α-olefin content and/or low density polyethylene. |
