Patent ID: 9567459
Date: 2017-02-14
CPC Classifications: B32B,C08J,C08K,C08L

Claim:
1. A thermoplastic polymer composition, comprising: (I) a block copolymer having a number average molecular weight of 30,000 to 200,000, or a hydrogenated product thereof; (II) an acryl-based polymer; and (III) a softening agent; wherein: the block copolymer comprises a polymer block (A) and a polymer block (B); the polymer block (A) comprises a-methylstyrene units in an amount of 50% by mass or more based on a total mass of the polymer block (A); the polymer block (B) comprises conjugated diene compound units or isobutylene units in an amount of 50% by mass or more based on a total mass of the polymer block (B); component (I), component (II), and component (III) are present in a ratio satisfying formulae (1) and (2): where W(I), W(II), and W(III) represent a content by mass of component (I), component (II), and component respectively, in the thermoplastic polymer composition; the thermoplastic polymer composition has a sea-island structure in which component (II) is dispersed in the form of particles in a continuous phase including component (I); an average dispersed particle diameter of the dispersed particles of component (II) is 200 nm or less; and 35% or more of the dispersed particles of component (II) have a dispersed particle diameter of 40 nm or more and less than 60 nm.