Biaxially stretched polyamide resin film, and process for...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 5/18 (2006.01) B29C 55/12 (2006.01) B65D 65/02 (2006.01) B65D 65/40 (2006.01) C08L 77/00 (2006.01)

Patent

CA 2718675

At an optional stage in the production step of a biaxially stretched film using a polyamide resin including, as a first component, nylon 6, and as a second component, a polyamide including xylylenediamine and an aliphatic dicarboxylic acid having 4 to 12 carbon atoms, the film is brought into contact with water set at 40°C or higher and lower than 70°C for 1 to 10 minutes and further with water set at 70°C or higher for 1 to 10 minutes. In the film thus obtained, the content of low molecular weight compounds is 0% by mass to 0.2% by mass.

L'invention concerne un procédé pour produire un film étiré bi­axialement à l'aide d'une résine de polyamide qui comprend du Nylon 6 en tant que premier composant et un polyamide composé de xylylènediamine et d'un acide dicarboxylique aliphatique comportant 4 à 12 atomes de carbone en tant que second composant, le film étant mis en contact avec de l'eau à une température supérieure ou égale à 40 °C et inférieure à 70 °C pendant 1 à 10 minutes puis encore mis en contact avec de l'eau à une température supérieure ou égale à 70 °C pendant 1 à 10 minutes dans n'importe quelle étape du procédé. Un film produit par le procédé a une teneur d'un composé de faible masse moléculaire de 0 à 0,2 % en masse.

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