Thermoplastic polymer composition, layered body, and protective film

A laminate comprising:

• a layer (A) formed from a thermoplastic polymer composition;
• a pressure-sensitive adhesive layer (B) comprising an acrylic pressure-sensitive adhesive;
• and
• a substrate layer (C) comprising a polyolefin-based polymer,
• wherein the layer (A), the pressure-sensitive adhesive layer (B), and the substrate layer (C) are laminated in the order of (B)-(A)-(C), and
• wherein the thermoplastic polymer composition consists of:
• 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 (a-1) comprising:
• a polymer block F comprising a structural unit derived from an aromatic vinyl-based monomer as a main component;
• and a hydrogenated or non-hydrogenated polymer block G comprising 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);
• optionally, a softening agent (a-4);
• and
• optionally, a component other than the aromatic vinyl-based block copolymer (a-1), acrylic polymer (a-2), olefin-based polymer containing polar groups (a-3) or softening agent (a-4) in an amount of 30 parts by mass or less with respect to 100 parts by mass of a total amount 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), at the proportions satisfying the following Expressions (1) to (3):
• 0.05≤W(a-2)/W(a-1)≤9 (1),
• 0.15<W(a-3)/(W(a-1)+W(a-2)+W(a-3)+W(a-4))≤0.9 (2), and
• 0≤W(a-4)/(W(a-1)+W(a-2)+W(a-3)+W(a-4))≤0.5 (3)
• wherein 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.

A thermoplastic polymer composition consisting of:

• 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 (a-1) comprising:
• a polymer block F comprising a structural unit derived from an aromatic vinyl-based monomer as a main component;
• and a hydrogenated or non-hydrogenated polymer block G comprising 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);
• optionally, a softening agent (a-4);
• and
• optionally, a component other than the aromatic vinyl-based block copolymer (a-1), acrylic polymer (a-2), olefin-based polymer containing polar groups (a-3) or softening agent (a-4) in an amount of 30 parts by mass or less with respect to 100 parts by mass of a total amount 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), at the proportions satisfying the following Expressions (1) to (3):
• 0.05≤W(a-2)/W(a-1)≤9 (1),
• 0.15<W(a-3)/(W(a-1)+W(a-2)+W(a-3)+W(a-4))≤0.9 (2), and
• 0≤W(a-4)/(W(a-1)+W(a-2)+W(a-3)+W(a-4))≤0.5 (3)
• wherein 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, and
• wherein the content of structural units having the polar group in the olefin-based polymer containing polar groups (a-3) is from 5% by mass to 50% by mass.