Kuraray Co., Ltd.

Isamu Okamoto

Eiji Nakamura

Haruhisa Masuda

Hiromichi Nakata

Motohiro Fukuda

Toshiyuki Zento

Masahiro Kawasaki

A modified acrylic block copolymer is obtained by a method comprising subjecting a block copolymer (C) to a reaction with an amine compound, wherein the block copolymer comprises a polymer block (A) comprising a (meth)acrylic acid ester unit (a) and a polymer block (B') comprising a (meth)acrylic acid ester unit (b&#x2032;), the (meth)acrylic acid ester unit (a) is structurally different from the (meth)acrylic acid ester unit (b&#x2032;), thereby partly or entirely converting the (meth)acrylic acid ester unit (b&#x2032;) into at least one selected from the group consisting of an N-substituted (meth)acrylamide unit (d), a (meth)acrylic acid unit (c), and an N-substituted bis((meth)acryl)amide unit (e).

Modified acrylic block copolymer, method for producing same, and intended use of same

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), wherein 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), wherein 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&#xb7;20 &#x3bc;m/m&#xb7;day&#xb7;atm or less.

Thermoplastic polymer composition, molded product, and multilayer structure

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Tainai, Japan

Isamu Okamoto