POLYPROPYLENE RESIN COMPOSITION FOR INTERIOR MATERIALS OF CARS, WITH EXCELLENT SCRATCH RESISTANCE AND IMPACT STRENGTH

摘要

PURPOSE: A polypropylene resin composition for the interior materials of a car is provided, to improve scratch resistance, impact strength, heat resistance and hardness. CONSTITUTION: The resin composition comprises 30-70 wt% of a propylene-ethylene block copolymer which comprises 70-100 wt% of a propylene polymer and 0-30 wt% of a propylene-ethylene copolymer; 5-30 wt% of an olefin-based elastomer which comprises an ethylene-propylene copolymer rubber or an ethylene-α-olefin copolymer; 0.01-0.2 wt% of an organic peroxide; 0.06-1.2 wt% of a crosslinking auxiliary; 5-40 wt% of an inorganic filler which is a needle-like silica or a mixture of a needle-like silica and one selected from talc, barium sulfate, calcium carbonate and wollastonite; and 1-7 wt% of a modified polypropylene resin which is grafted by an unsaturated carbonic acid and its derivatives and has a degree of grafting of 0.5-5 wt%.