EASILY TORN POLYESTER FILM AND ITS USE

摘要

PROBLEM TO BE SOLVED: To provide a polyester film easily torn and excellent in practicability.

SOLUTION: This polyester film is a film comprising a specific ratio of a polyester (1) which mainly comprises a butylene terephthalate repeating unit and an acrylonitrile/styrene (AS copolymer) (2), and the AS copolymer (2) is dispersed in the polyester (1) as a specific particle. In this film, tear strength in the direction orthogonal to the long axis of the dispersed particle (T(⊥)), and tear strength in the direction of the long axis (T(s)) are in a relation of T(⊥)/ T(s)>1.0, and the film is easily torn in the direction orthogonal to the long axis of the dispersed particle. A multilayered film is prepared from this polyester film, and an easily openable packaging is structured with this multilayered film, and an easily openable lid material uses this multilayered film.

COPYRIGHT: (C)2004,JPO&NCIPI