Patent ID: 7993713

Claim:
A heat shrinkable multilayer film comprising an outer surface layer (a) formed of a thermoplastic resin, a first intermediate layer (b 1 ) formed of a polyamide resin, a second intermediate layer (b 2 ) formed of a saponified product of an ethylene-vinyl acetate copolymer, and an inner surface layer (c) formed of a polyolefin resin, wherein the shrink of the heat shrinkable multilayer film in water at 90° C. is within a range of from 3 to 45% in each of machine and transverse directions, the polyamide resin is a mixture of 60 to 90% by weight of an aliphatic polyamide having a melting point of 210° C. or higher and 10 to 40% by weight of an aromatic polyamide comprising isophthalic acid and terephthalic acid as acid components, and the multilayer film is obtained by stretching a multilayer film comprising the outer surface layer (a), the first intermediate layer (b 1 ), the second intermediate layer (b 2 ) and the inner surface layer (c) at a draw ratio of from 2.5 to 4 times in each of machine and transverse directions and then subjecting the stretched film to a heat relaxation treatment so as to give a relaxation ratio of from 2 to 40%.