Polypropylene resin composition

Claim 1

A polypropylene resin composition comprising: (A) 50 to 90% by weight of a crystalline ethylene-propylene block copolymer having an ethylene content of 4 to 10% by weight, an insolubility, in boiling n-heptane, of a polypropylene component of 97% by weight or more, an inherent viscosity in decalin at 135° C., of p-xylene soluble at room temperature of 3 to 7, a melt flow index of 3 to 30, and a flexural modulus of 15,000 kg/cm 2 or more; (B) 5 to 20% by weight of a hydrogenated block copolymer composed of both end blocks of an aromatic vinyl compound and an intermediate block of a conjugated diene polymer, the content of both end blocks being 10 to 40% by weight of the copolymer, 10% or less of both end blocks and 90% or more of the intermediate block being in a hydrogenated state; (C) 0 to 15% by weight of an amorphous ethylene propylene copolymer having an inherent viscosity, in decalin at 135° C., of 1.8 to 3.5 and a Mooney viscosity ML 1+4 (100° C.) of 40 to 100; (D) 0 to 5% by weight of a high density polyethylene having a melt flow index of 1 to 10; and (E) 5 to 30% by weight of a particulate or flaky inorganic filler having an average particle diameter of 3 μm or less, wherein the blending ratio (B)/(C) (by weight) of the hydrogenated block copolymer component (B) to the amorphous ethylene-propylene copolymer component (C) is 100/0 to 20/80.