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US 5,686,173 AGranted
Biaxially stretched film for packaging
AssigneeMitsubishi Chemical Corporation
InventorsToshio Fujii, Kazuhiro Kato, Toyomitsu Kondo, Sinji Kawasaki
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Abstract
A biaxially stretched film for packaging, having a thickness of not more than 40 .mu.m; comprising surface layers each made of a propylene-ethylene copolymer resin and an intermediate layer disposed therebetween made of a polyamide resin comprising an aromatic polyamide resin, and having thickness of 10 to 80% of the overall thickness of the biaxially stretched film; and obtained by a process comprising a coextrusion step, a rapid cooling step, and a stretching step.
Claims13
A biaxially stretched film for packaging, having an overall thickness of 2 to 40 .mu.m;
- said film comprising surface layers each made of a propylene-ethylene copolymer resin and an intermediate layer disposed therebetween made of a copolyamide or polyamide resin composition comprising 60 to 98% by weight of an aliphatic polyamide resin and 2 to 40% by weight of an aromatic polyamide resin, said intermediate layer having thickness of 10 to 80% of the overall thickness of the biaxially stretched film;
- and obtained by a process comprising a coextrusion step, using water-cooled inflation or T-die molding by contacting the extrudate with a chill roll, and a stretching step.
Dependencies are inferred from the claim text.