| abstract |
Provided is a thermoplastic polymer composition containing an aromatic vinyl-based block copolymer (a-1) having a number average molecular weight of 30,000 to 200,000, the aromatic vinyl-based block copolymer containing a polymer block F containing a structural unit derived from an aromatic vinyl-based monomer as a main component and a hydrogenated or non-hydrogenated polymer block G containing a structural unit derived from a conjugated diene monomer or an isobutylene monomer as a main component; an acrylic polymer (a-2); an olefin-based polymer containing polar groups (a-3); and a softening agent (a-4), at the proportions that satisfy the following Expressions (1) to (3):n n0.05≤ W (a-2) /W (a-1) ≤9 (1)n n0.1< W (a-3) /( W (a-1) +W (a-2) +W (a-3) +W (a-4) )≤0.9 (2), andn n0≤ W (a-4) /( W (a-1) +W (a-2) +W (a-3) +W (a-4) )≤0.5 (3)n nwherein W (a-1) , W (a-2) , W (a-3) and W (a-4) represent the contents (on a mass basis) of the aromatic vinyl-based block copolymer (a-1), acrylic polymer (a-2), olefin-based polymer containing polar groups (a-3) and softening agent (a-4), respectively, in the thermoplastic polymer composition. |