Importance

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Abstract

The present invention is to provide a biaxially-stretched layer polyamide film which is excellent in bag breakage resistance, impact resistance and bending fatigue resistance, particularly in bending fatigue resistance under low-temperature environments, is excellent in an effect such as bag breakage prevention during transportation or storage of products when used as a packaging material for packaging foods or the like, can exhibit both high heat seal strength and good appearance even when being automatically filled with a liquid soup, a seasoning agent, or the like at a high speed, and further has improved volume reduction performance and environmental friendliness as compared with conventional polyamide films, and is thus suitable for various packaging applications, particularly for packaging bags for filling liquid materials such as soup and sauce. The biaxially-stretched layer polyamide film comprising: an A layer of a mixed polymer containing 97 to 70 wt. % of an aliphatic homopolyamide, 3 to 20 wt. % of an aliphatic copolyamide, and 0 to 10 wt. % of a thermoplastic elastomer, and a B layer of a mixed polymer containing 99.5 to 90 wt. % of an aliphatic homopolyamide and 0.5 to 10.0 wt. % of a thermoplastic elastomer, the B layer being layered on at least one surface of the A layer, and a film thickness of less than 9 μm.

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First Claim