B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 55/12 (2006.01) B29C 55/18 (2006.01) C08J 5/18 (2006.01) C08L 77/06 (2006.01)
Patent
CA 2605628
A method of producing a biaxially stretched, multi-layered polyamide film which includes a step of biaxially stretching a non-stretched laminate film composed of a layer mainly made of a polyamide resin and a layer mainly made of an aliphatic polyamide resin. The biaxial stretching is made by a roll/tenter successive biaxial stretching method. The polyamide resin is composed of a diamine constitutional unit mainly made of m-xylylenediamine units and a dicarboxylic acid constitutional unit mainly made of units derived from an .alpha.,.omega.-aliphatic dicarboxylic acid having 6 to 12 carbon atoms. The non-stretched laminate film is cooled by a cooling roll having a temperature within a limited range and then successively and biaxially stretched. With such a production method, the biaxially stretched, multi-layered polyamide film is excellent in the gas barrier properties, pinhole resistance, flexibility, and impact resistance.
Kouno Kenji
Nanba Hiroyuki
Takahashi Makoto
Mitsubishi Gas Chemical Company Inc.
Smart & Biggar
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