| 摘要 |
<p>A thermoplastic polymer composition having good flexibility and excellent barrier properties with respect to gases and organic liquids, which can be adhesively bonded to a polyolefin resin, this composition comprising an ethylene - vinyl alcohol copolymer (A), a polymer mixture (B) composed of a block copolymer (I) mainly comprising a vinyl aromatic polymer block and a conjugated diene polymer block which may be hydrogenated, and a rubber softener (II), and a polyolefin resin (C). Here, the following three conditions are satisfied: the ratio of ÄAÜ:ÄBÜ is in the range of 10:90 to 50:50, the ratio of ÄIÜ:ÄIIÜ is in the range of 30:70 to 90:10, the ratio of (ÄAÜ + ÄBÜ):ÄCÜ is in the range of 100:0 to 100:30, when the blending amount of component (A) in the thermoplastic polymer composition is denoted by ÄAÜ parts by weight, the blending amount of component (B) is denoted by ÄBÜ parts by weight, the blending amount of component (C) is denoted by ÄCÜ parts by weight, the blending amount of block copolymer (I) in component (B) is denoted by ÄIÜ parts by weight, and the blending amount of rubber softener (II) is denoted by ÄIIÜ parts by weight. Further, at least part of the block copolymer (I) is modified at a modification ratio of 0.05 wt.% or higher so as to have a functional group capable of reacting with the ethylene - vinyl alcohol copolymer (A). The ISO type A hardness of the thermoplastic polymer composition is not less than 30 and not higher than 90, and the oxygen permeation coefficient is 20,000 mL.20 mu m/m<2>.day.atm or less.</p> |
