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Abstract

A thermoplastic polymer composition has good flexibility, lightweight properties, moldability, and heat resistance, and in particular, is excellent in wear resistance. The thermoplastic polymer composition includes: at least one block copolymer (a) selected from among an α-methylstyrene based block copolymer having a number average molecular weight of 30,000 to 500,000 and a hydrogenated product thereof, the α-methylstyrene based block copolymer including a polymer block A mainly composed of an α-methylstyrene unit and a polymer block B mainly composed of a conjugated diene unit; a propylene-based polymer (b); and an ethylene-based polymer (c) having a density of 0.94 g/cm³ or less, in a ratio satisfying the following inequalities (1) and (2):

description='In-line Formulae' end='lead'0.1≦W(a)/[W(a)+W(b)+W(c)]≦0.8  (1)description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'1≦W(b)/W(c)  (2)description='In-line Formulae' end='tail'

wherein W(a), W(b), and W(c) represent the masses of the block copolymer (a), the propylene-based polymer (b), and the ethylene-based polymer (c), respectively.

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First Claim