| 摘要 |
This invention relates to a polypropylene bumper cover composition, particularly to a polypropylene bumper cover composition with improved contraction rate, painting properties, and molding properties. This composition includes 55 to 70 wt % of a polypropylene resin, 28 to 45 wt % of an ethylene-propylene rubber component, 2 to 5 wt % of an inorganic filler, 1 to 2.5 wt % of high density polyethylene, and 2.5 to 7 wt % of oxidation inhibitor, lubricant and carbon black. The ethylene-propylene rubber component may include two ethylene-propylene rubbers having different Mooney viscosities. The inorganic filler can be talc or fine talc.
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