HEAT-SHRINKABLE POLYESTER FILM

摘要

PURPOSE:To obtain the title film excellent in transparency, resistance to heat and chemicals, and mechanical strengths and free from uneven shrinkage and pockmark-like wrinkles in thermal shrinkage by compounding a polyethylene terephthalate polymer with a specified amt. of a polybutylene terephthalate polymer and molding the resulting compsn. into a film. CONSTITUTION:A polyethylene terephthalate polymer (pref. having a glass transition point of 50-80 deg.C) is compounded with 40-70wt.% polybutylene terephthalate polymer (pref. having a glass transition point of 20-40 deg.C which is different from that of the polyethylene terephthalate polymer by at least 10 deg.C) and molded to give the title film.