易引裂き性ポリエステルフィルム及びその用途

Easily torn polyester film and its use

Abstract

【課題】易引裂き性で、実用性に優れたポリエステルフィルムを提供する。 【解決手段】ブチレンテレフタレート繰り返し単位を主成分とするポリエステル(1)、及びアクリロニトリル−スチレン共重合体(AS共重合体)の特定の組成比からなるフィルムであって、該AS共重合体(2)がポリエステル(1)中に特定の粒子状に分散してなり、かつ該フィルムが、その分散粒子の長軸方向と直交する方向の引裂強さ(T(⊥))と、長軸方向の引裂き強さ(T(s))とが、T(⊥)/T(s)>1.0の関係であって、該分散粒子の長軸方向と直交する方向に易引裂き性を有することを特徴とするポリエステルフィルム、それを用いた多層フィルム、及び該(多層)フィルムより構成される易開封性包装袋、並びに該(多層)フィルムを用いた易開封性フタ材。 【選択図】 なし
<P>PROBLEM TO BE SOLVED: To provide a polyester film easily torn and excellent in practicability. <P>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. <P>COPYRIGHT: (C)2004,JPO&NCIPI

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