Patent ID: 9265265
Filing Date: 2016-02-23
CPC Classification: A22C,B32B,Y10T

Claim Text:
1. A biaxially drawn tubular film comprising 5 or 7 layers, of which each of the outer layer and the two layers following thereon are immediately adjacent to one another and are aliphatic polyamide-based layers containing at least one aliphatic (co)polyamide, but said layers are otherwise differently composed and the layer which forms an outside surface of said film consists of 60% to 80% by weight of nylon 6 and 8% to 20% by weight of a thermoplastic copolymer containing carboxyl groups, the 2nd layer from the outside consists of a mixture of 40 to 70% by weight of nylon 6 and 30 to 60% by weight of nylon 6/66, and the 3rd layer from the outside consists of 85 to 95% by weight of nylon 6 and 5 to 15% by weight nylon 6/66, said film further comprises a 4 said 4 said optional 5 said optional 6 and said inner surface layer comprises nylon 6.