Patent ID: 7354654

Claim:
A thermoplastic polymer composition comprising the following components (A), (B), and (C): ethylene-vinyl alcohol copolymer (A); a polymer mixture (B) composed of a block copolymer (I) and a rubber softener (II), wherein the block copolymer (I) comprises an unmodified block copolymer and a modified block copolymer, the unmodified block copolymer mainly comprises a vinyl aromatic polymer block and a hydrogenated, conjugated diene polymer block, the modified block copolymer is a block copolymer which may be hydrogenated, the block copolymer mainly comprising a vinyl aromatic polymer block and a conjugated diene polymer block and being obtained by radical-addition of Î±,Î²-unsaturated carboxylic acid and/or a derivative thereof to part of the unmodified block copolymer of block copolymer (I); and a polyolefin resin (C), wherein the following four conditions are satisfied: the ratio of [A]:[B] is in the range of 10:90 to 50:50, the ratio of [I]:[II] is in the range of 30:70 to 90:10, the ratio of ([A]+[B]):[C] is in the range of 100:0 to 100:30, the ratio of [the unmodified block copolymer]:[the modified block copolymer] is in the range of 90:10 to 20:80, when the blending amount of component (A) in the thermoplastic polymer composition is denoted by [A] parts by weight, the blending amount of component (B) is denoted by [B] parts by weight, the blending amount of component (C) is denoted by [C] parts by weight, the blending amount of block copolymer (I) in component (B) is denoted by [I] parts by weight, and the blending amount of rubber softener (II) is denoted by [II] parts by weight, and the blending amount of unmodified or modified block copolymer is denoted by [the unmodified block copolymer] or [the modified block copolymer] parts by weight, wherein the modified block copolymer has been modified at a modification ratio of 0.05 wt. % or higher and 20 wt. % or less, so as to have a functional group capable of reacting with the ethylene-vinyl alcohol copolymer (A), the ISO type A hardness of the composition is not less than 30 and not higher than 90, and the oxygen permeation coefficient is 20,000 mLÂ·20 Î¼m/m 2 Â·dayÂ·atm or less, and wherein the ethylene-vinyl alcohol copolymer (A) is in the form of particles that are dispersed in layers in a matrix comprising polymer mixture (B) and polyolefin resin (C).