abstract |
(57) [Abstract] [PROBLEMS] To provide a hard thermoplastic resin composition having high low-temperature impact strength, rigidity, Rockwell hardness and a small linear expansion coefficient, and an injection molded article thereof. [Structure] Crystalline propylene-ethylene block copolymer (A) 54% by weight, ethylene-butene-1 copolymer rubber (B) 13% by weight, ethylene-propylene copolymer rubber (C) 13% by weight, talc (D) ) 20% by weight, MFR of (A) is 58, [η] T is 1.4, EP content is 12% by weight, Q value of P part is 4, [η] P is 0.9, E [Η] EP of P part is 5.2, ethylene content is 32% by weight, Q value of (B) is 2.2, butene-1 content is 18% by weight, [Η] is 1.9, Mooney viscosity is 66, Q value of (C) is 2.3, polypropylene content is 27% by weight, [η] is 2.1, Mooney viscosity is 88, average particles of (D) The diameter is 2. A hard thermoplastic resin composition having an MFR of 17 and a flexural modulus of 17500, and an injection-molded article thereof, which is 1 μm. |