| 摘要 |
PURPOSE:To obtain the titled bumper with suppressed whitening in the molding or use, by blending each specific propylene-ethylene block copolymer and ethylene-propylene copolymer rubber. CONSTITUTION:The objective bumper can be obtained by blending (A) 60-90wt.% of a propylene-ethylene block copolymer with an ethylene content 5-10(pref. 5-8)wt.%, rubber content 12-20(pref. 15-20)wt.% and also the ethylene content in said rubber component 30-40(pref. 30-35)wt.%, (B) 40-10wt.% of an ethylene-propylene copolymer rubber with a Mooney viscosity 10-100 (pref. 15-70) and preferably, (C) 0.5-15wt.% of inorganic filler and (D) 0.1-10wt.% of high-density polyethylene with a MFR 1-20g/10min. The component A can be prepared by copolymerization in the presence of a catalyst made from transition metal compound and organometallic compound, and pref. by adding an electron donor. |
