| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a biaxially stretched polybutylene terephthalate film whose stretchability is extremely good and can perform long time continuous operation, a battery case packaging material for cold forming with excellent moisture resistance, acid resistance and cold forming performance, especially a packaging material for a battery such as a lithium ion secondary battery. <P>SOLUTION: As the main material of the biaxially stretchable polybutylene terephthalate film, a PBT resin composition in which a polyethylene terephthalate resin is compounded in a range of 1 to 30 wt.% or less to a polybutylene terephthalate, is used. The obtained biaxially stretchable polybutylene terephthalate film is used as the base material layer and/or the barrier reinforcement layer of the battery case packaging material for cold forming, composed of the base material layer, a barrier layer and a sealant layer, or the base material layer, the barrier layer, the barrier material reinforcement layer and the sealant layer. <P>COPYRIGHT: (C)2012,JPO&INPIT |
