| 摘要 |
PROBLEM TO BE SOLVED: To provide superior affinity to electrolytic solution and suppress lowering of the battery performance when used for a long time by impregnating a specific ratio of epoxy denaturated polyvinyl alcohol composed of epoxy group containing vinyl alcohol and vinylester, and polyethylene glycol group containing the respective elements to a base material mainly composed of polyolefin resin. SOLUTION: Among base materials are unwoven and woven fabrics such as span bond mainly composed of fibers such as polypropylene. Epoxy group containing vinyl alcohol impregnated therein includes elements expressed by formula I-IV (where, R1-R4 and R6 are H or alkyl group, R5 is alkyl group, n1 and n2 are 1 and 2, and n3 is 4-50) respectively containing 0.01-10 mol%, 70-99.98 mol%, 0-29 mol%, and 0.01-10 mol%. The impregnation ratio of the epoxy group containing vinyl alcohol to the base material 100 pts.wt. is 1-20 pts.wt. It can be industrially manufactured at low cost. |
