| abstract |
(57) [Abstract] [PROBLEMS] To provide a soft 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) 62 wt%, ethylene-butene-1 copolymer rubber (B) 19 wt%, ethylene-propylene copolymer rubber (C) 19 wt%, ( A) MFR 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, [η] EP of EP part is 5.2, and ethylene content is 32% by weight. , (B) has a Q value of 2.1, butene-1 content is 18% by weight, [η] is 1.4, Mooney viscosity is 14, and (C) has a Q value of 2.1 and polypropylene content is 27% by weight. %, [Η] is 1.9, Mooney viscosity is 50 And a flexible thermoplastic resin composition having an MFR of 20 and a flexural modulus of 6000, and an injection-molded article thereof. |