Patent ID: 8137772
Filing Date: 2012-03-20
Classification: A22C,Y10T

Abstract:
1. A multilayer seamless tubular film comprising an outer polymer layer in which the polymer comprises 70 to 100% by weight of aliphatic or partially aromatic polyamides or copolyamides or blends thereof, and 0 to 30% by weight of other polymers, a middle polymer layer which consists essentially of 50 to 80% by weight of ethylene-methyl acrylate copolymers, wherein the methyl acrylate content is 5 to 30% by weight, and 20 to 50% by weight of ethylene-maleic anhydride copolymers, which contain 0.15 to 5% by weight of maleic anhydride units, and an inner polymer layer in which the polymer comprises 40 to 100% by weight of aliphatic or partially aromatic polyamides or copolyamides or blends thereof, 0 to 60% by weight of carboxyl-containing ethylene copolymers or their salts and 0 to 20% by weight of other polymers, the total amount of which gives 100% by weight.