Patent ID: 7906584

Claim:
A polymer composition containing an addition polymerization-based block copolymer (a), an acrylic resin (b), and a softener (c), wherein the addition polymerization-based block copolymer (a) has a weight average molecular weight of 30000 to 200000 and is at least one selected from block copolymers comprising at least one polymer block A and at least one polymer block B; the polymer block A comprises mainly an aromatic vinyl compound unit wherein at least 30% by mass of the aromatic vinyl compound units are alkylstyrene-derived structural units (I) in which at least one alkyl group having 1 to 8 carbon atoms is bound directly to a benzene ring; the polymer block B comprises a conjugated diene compound unit, wherein 70% or more of carbon-carbon double bonds resulting from the conjugated diene compound units of the polymer block B are hydrogenated; and the components of the polymer composition are present in respective proportions (by mass) so that the following relationships (1) and (2) hold: 0.05≦ Wb/Wa≦ 2 (1) 0≦ Wc /( Wa+Wb+Wc )≦0.5 (2) where Wa, Wb, and Wc are the amounts (by mass) of the components of the polymer composition: the addition polymerization-based block copolymer (a), the acrylic resin (b) and the softener (c), respectively, wherein the polymer composition has a sea-island morphology; wherein the acrylic resin (b) is a homopolymer of methyl methacrylate or a copolymer of methyl methacrylate and one or more copolymerizable monomers selected from the group consisting of acrylic acid, metal salts of acrylic acid, acrylic acid esters, methacrylic acid, metal salts of methacrylic acid, methacrylic acid esters, vinyl acetate, aromatic vinyl compounds and maleimide compounds; and wherein the polymer composition, when formed into a 2 mm thick sheet-shaped article and tested for the Taber abrasion according to JIS K 6264, gives a Taber abrasion of 100 mm 3 or less, the test conducted by abrading the sheet with an H-22 abrasion disk at 1000 rpm while applying a 1 kg load.