| 摘要 |
PURPOSE:To provide the titled compsn. which has excellent coatability and well- balanced property between rigidity and impact strength, by blending a specified crystalline ethylene-propylene block copolymer, an amorphous ethylene-propylene copolymer and talc in a specified ratio. CONSTITUTION:55-65wt% crystalline ethylene-proplylene block copolymer (A) which has an ethylene content of 5-10wt% and a melt flow index of 2-10 and in which PP component contains boiling heptane-insoluble matter of 97wt% or more and the intrinsic viscosity (in decalin at 135 deg.C) of room temperature p-xylene-soluble matter is 3-4, 30-35wt% amorphous ethylene-propylene copolymer (B) which has an intrinsic viscosity in decalin at 135 deg.C of 2.0-3.5 and a Mooney viscosity ML1+4 (100 deg. of 40-100, and 5-15wt% talc (C) having an average pavticle size of 0.5-5mu, are mixed together to obtain the titled compsn. This compsn. is molded into an automobile bumper, e.g. by injection molding. EFFECT:Excellent low-temperature impact resistance. |
