| 摘要 |
PURPOSE:To contrive improvements in heat-seal resistance, freeze resistance, gloss and transparency, by making use of a multilayer film having polyether ester amide resin, gas barrier property resin and heat seal property resin respectively for its surface layer, intermediate layer and seal layer. CONSTITUTION:A freeze resistant multilayer film is constituted of at least three layers of a surface layer composed of polyether ester amide resin, an intermediate layer composed of gas barrier property resin and a seal layer composed of resin having heat seal properties. The polyether ester amide resin is a block copolymer obtained by joining in a block form a polyamide-forming ingredient and polyalkylene ether glycol to each other through an ester linkage, and it is preferable when the crystalline melting point is 110-230 deg.C and glass transition temperature (Tg) is -50 deg.C or lower. A saponified matter of an ethylene-vinyl acetate copolymer or a vinylidene chloride copolymer is preferable as gas barrier property resin. Polyolefin resin is preferable as the resin having heat seal properties. The total thickness of the multilayer film is 40-200mum.
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