POLYPROPYLENE COMPOSITION

摘要

PURPOSE: To obtain a polypropylene composition containing talc and a specific mixture of a block copolymer and a copolymer rubber, having excellent impact resistance, hardness, rigidity, heat-resistance and moldability and useful as an interior material of automobile. CONSTITUTION: This polypropylene copolymer contains (A) 75-95wt.% of a propylene-ethylene block copolymer having a melt flow rate (MFR) of 25-40g/10min, (B) 0-10wt.% of an ethylene-propylene copolymer rubber having an MFR of 1-20g/10min and an ethylenebutene copolymer rubber having an MFR of 1-30g/10min and (C) 5-15wt.% of talc having an average particle diameter of <=5μm. The component A contains 3-20wt.% (based on 100wt.% of the component A) of a propylene-ethylene copolymer block (the intrinsic viscosity of the block is 3-5dl/g and the ethylene content in the copolymer block is 30-50wt.%) and a propylene homopolymer block satisfying the formulaΔHm >=24.5+1.583logMFR whereinΔHm is heat of fusion.