SUCCESSIVELY BIAXIALLY ORIENTED POLYESTER FILM AND METHOD OF MANUFACTURING THE SAME

摘要

PPROBLEM TO BE SOLVED: To provide a polyester film with a low degree of undermining of laminate breaking tenacity at the end part, achieved through inhibiting cleavage, and a method of manufacturing the same. PSOLUTION: A successively biaxially oriented polyester film in which the laminate breaking tenacity T10 in a position 10 cm distant widthwise from a clip grab mark of the film stretched transversely by a tenter, satisfies an expression T100.6N/cm. Further, the film can be stretched longitudinally 4-5 times as much at a draft temperature of 125-135C. PCOPYRIGHT: (C)2010,JPO&INPIT