Thermoplastic polymer composition and moldings thereof

摘要

The invention provides a thermoplastic polymer composition containing a hydrogenated block copolymer mixture (a), a polyvinyl acetal (b), and a thermoplastic elastomer (c), wherein the hydrogenated block copolymer mixture (a) contains a hydrogenated block copolymer (a1) containing hydrogenated polymer blocks (A1) containing aromatic vinyl units and hydrogenated polymer blocks (B1) containing conjugated diene units and a hydrogenated block copolymer (a2) containing hydrogenated polymer blocks (A2) containing aromatic vinyl units and hydrogenated polymer blocks (B2) containing conjugated diene units; (A1) content is 5 mass % or higher and lower than 40 mass % in (a1); (A2) content is 40 mass % to 70 mass % in (a2); the polyvinyl acetal (b) has been produced through acetalization of a polyvinyl alcohol; and the thermoplastic elastomer (c) contains hydrogenated polymer blocks (A3) containing aromatic vinyl units, hydrogenated polymer blocks (B3) containing conjugated diene units, and polymer blocks having a polar functional group (C).

主权项

1. A thermoplastic polymer composition comprising:
100 parts by mass of a hydrogenated block copolymer mixture (a); 0.1 to 100 parts by mass of a polyvinyl acetal (b); and 0.1 to 20 parts by mass of a thermoplastic elastomer (c), wherein the hydrogenated block copolymer mixture (a) comprises: a hydrogenated block copolymer (a1) comprising at least one polymer block (A1) comprising an aromatic vinyl compound unit and at least one hydrogenated polymer block (B1) comprising a conjugated diene compound unit wherein the polymer block (A1) content is 5 mass % or higher and lower than 40 mass %, and a hydrogenated block copolymer (a2) comprising at least one polymer block (A2) comprising an aromatic vinyl compound unit and at least one hydrogenated polymer block (B2) comprising a conjugated diene compound unit wherein the polymer block (A2) content is 40 mass % to 70 mass %; the polyvinyl acetal (b) is obtained by acetalization of a polyvinyl alcohol having an average polymerization degree of 100 to 4,000, and the polyvinyl acetal (b) has an acetalization degree of 55 to 88 mol %; and the thermoplastic elastomer (c) comprises at least one polymer block (A3) comprising an aromatic vinyl compound unit, at least one hydrogenated polymer block (B3) comprising a conjugated diene compound unit, and at least one polymer block comprising a polar functional group (C).