Patent ID: 7569638

Claim:
A thermoplastic elastomer composition comprising 100 parts by mass of acrylic multi-layer polymer particles (A); 5 to 300 parts by mass of an ethylene/vinyl ester copolymer (B); and 0.5 to 150 parts by mass of a graft copolymer (C) including an ethylene/vinyl ester copolymer backbone and a graft chain bonded to the backbone, the graft chain including a monomer unit having a polarity higher than that of the backbone; (a) wherein the acrylic multi-layer polymer particles (A) each contain two or more layers including at least one inner rubber layer (I) and at least one outermost thermoplastic resin layer (II); (b) wherein the rubber layer (I) is a layer of a copolymer derived from a monomer mixture (i) comprising 50 to 99.99 parts by mass of an acrylic ester, 49.99 to 0 part by mass of another monofunctional monomer copolymerizable with the acrylic ester, and 0.01 to 10 parts by mass of a polyfunctional monomer, (c) wherein the thermoplastic resin layer (II) is a layer of a polymer derived from a monomer component (ii) comprising 40 to 100 parts by mass of a methacrylic ester and 60 to 0 part by mass of another monofunctional monomer copolymerizable with the methacrylic ester, (d) wherein a polymer constituting an outermost layer of the thermoplastic resin layer (II) has a number-average molecular weight of 30,000 or less as determined by gel permeation chromatography (GPC), (e) wherein a ratio of the total mass of the rubber layer (I) to the total mass of the thermoplastic resin layer (II) [(I)/(II)]is 30/70 to 90/10, and (f) wherein the acrylic multi-layer polymer particles (A) each have an average particle diameter of 150 nm or less.