Shape-memory polybutylene terephthalate film, production process and use thereof, and process for production of polybutylene terephthalate film

摘要

A polybutylene terephthalate laminate film having excellent shape memory and high-temperature dimensional stability obtained by (1) subjecting a laminate film comprising a polybutylene terephthalate film and another film or film laminate to a shaping treatment at a temperature T₁ equal to or lower than the glass transition temperature of said polybutylene terephthalate while maintaining a first shape; (2) deforming the shaped laminate film to a second shape at a temperature T₂ higher than said glass transition temperature; and (3) cooling said laminate film to a temperature T₃ equal to or lower than said glass transition temperature.