| 摘要 |
PURPOSE:To obtain the title composition excellent in heat distortion resistance, impact resistance, etc., by mixing specified two crystalline ethylene/propylene block copolymer with specified two amorphous ethylene/propylene random copolymer and talc. CONSTITUTION:20-40 wt. % crystalline ethylene/propylene block copolyemr (A) of an ethylene content of 4-10 wt. %, a boiling n-heptane-insoluble portion in the polypropylene component >= 95 wt. % and a MFR of 40-65 is mixed with 10-30 wt. % block copolymer (B) which is the same as component A except that it has a MFR of 10-35, 12-20 wt. % amophous ethylene/propylene random copolymer of a Mooney viscosity of 20-25 ML1+4, 4-12 wt. % random copolymer (D) which is the same as component C except that it has a Mooney viscosity of 40-80 ML1+4 and 12-15 wt. % talc (E) having an average particle diameter <= 3mum so that the total of components A and B may be 57-62 wt. % and the total of components C and D may be 20-25 wt. %. |
