| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery case material for a secondary battery that is superior in a moisture barrier property and dynamic strength, as well as, in thermal adhesion and pressure-withstanding properties. SOLUTION: The battery case is made of polypropylene based resin, having a weight average molecular weight in conversion of polystyrene of 650,000 to 1,000,000 determined by gel permeation chromatography. The polypropylene, based resin containing a propylene-ethylene random copolymer, with a content of ethylene of 0.1 to less than 1 wt.%, is suitable for a battery container for a secondary battery, having either a nickel-metal hydride electrode or a lithium electrode, (where the total volume of the polypropylene resin is to be 100 wt.%.). COPYRIGHT: (C)2007,JPO&INPIT |
