Stretched polyamide film
OwnerHiroyuki Nanbainventor
Life of this patent
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Abstract
A stretched film made of a resin mixture of a polyamide resin X with an amorous polyamide resin Y and/or an ionomer resin Z. The polyamide resin X includes a diamine constitutional unit containing 70 mol % or more of m-xylylene diamine unit and a dicarboxylic acid constitutional unit containing 70 mol % or more of C6-C12 α,ω-aliphatic dicarboxylic acid unit. A film produced by melt-extruding the resin mixture can be stretched in a high ratio exceeding 4 times in at least one direction of MD and TD. The highly stretched film produced by the stretching in a ratio exceeding 4 times exhibits good gas-barrier properties and transparency.
Claims14
A stretched film which is produced by melt-mixing a polyamide resin X with an amorphous polyamide resin Y and/or an ionomer resin Z in a weight ratio, X/(Y+Z), of 70/30 to 95/5, the polyamide resin X comprising a diamine-constitutional unit containing 70 mol % or more of m-xylylene diamine unit and a dicarboxylic acid constitutional unit containing 70 mol % or more of C6-C12 α, ω-aliphatic dicarboxylic acid unit;
- extruding the mixture into a form of film;
- and stretching the film in a stretch ratio exceeding 4 times in at least one direction of MD and TD.
A stretched multi-layer film produced by respectively melt extruding a resin mixture, an adhesive resin and a thermoplastic resin to produce a multi-layer film and stretching the multi-layer film in a stretch ratio exceeding 4 times in at least one direction of MD and TD, wherein the resin mixture comprises a polyamide resin X and an amorphous polyamide resin Y and/or an ionomer resin Z in a weight ratio, X/(Y+Z), of 70/30 to 95/5, and wherein the polyamide resin X comprises a diamine constitutional unit containing 70 mol % or more of m-xylylene diamine unit and a dicarboxylic acid constitutional unit containing 70 mol % or more of C6-C12 α, ω-aliphatic dicarboxylic acid unit.
Dependencies are inferred from the claim text.