| 摘要 |
PURPOSE:A polyester film for packaging, obtained by blending polyethylene naphthalate with a condensation based liquid crystal polymer, having improved elongation, weather resistance and gas barrier properties and suitable for packaging foods, medicines, etc. CONSTITUTION:A polyester film obtained by blending (A) 99.9-90wt% polyethylene naphthalate having >=0.40, preferably 0.40-0.90 intrinsic viscosity and >=1.379 density with (B) 0.1-10wt% condensation based liquid crystal polymer, forming a film and biaxially drawing the film. A liquid crystal polymer consisting of terephthalic acid/p-hydroxybenzoic acid (30/70-70/30 ratio) as a carboxylic acid component and ethylene glycol as a diol component may be cited as the component (B). |
