Patent ID: 7439296

Claim:
A polypropylene resin composition comprising: from 50 to 93% by weight of a polypropylene resin (A), from 1 to 25% by weight of an ethylene-α-olefin copolymer rubber (B) which includes units of an α-olefin having from 4 to 12 carbon atoms and ethylene units and has a density of from 0.850 to 0.870 g/cm 3 and a melt flow rate, as measured at a temperature of 230° C. and a load of 2.16 kgf, of from 0.05 to 1 g/10 min, from 1 to 25% by weight of an ethylene-α-olefin copolymer rubber (C) which includes units of an α-olefin having from 4 to 12 carbon atoms and ethylene units and has a density of from 0.850 to 0.870 g/cm 3 and a melt flow rate, as measured at a temperature of 230° C. and a load of 2.16 kgf, of from 2 to 20 g/10 min, and from 5 to 25% by weight of an inorganic filler (D), provided that the overall amount of the polypropylene resin composition is 100% by weight, wherein the polypropylene resin (A) is a propylene-ethylene block copolymer (A-1) satisfying requirements (1), (2), (3) and (4) defined below or a polymer mixture (A-3) comprising the block copolymer (A-1) and a propylene homopolymer (A-2), requirement (1): the block copolymer (A-1) is a propylene-ethylene block copolymer comprising from 55 to 90% by weight of a polypropylene portion and from 10 to 45% by weight of a propylene-ethylene random copolymer portion, provided that the overall amount of the block copolymer (A-1) is 100% by weight, requirement (2): the polypropylene portion of the block copolymer (A-1) is a propylene homopolymer or a copolymer comprising propylene units and 1 mol % or less of units of a comonomer selected from the group consisting of ethylene and α-olefin having 4 or more carbon atoms, provided that the overall amount of units constituting the copolymer is 100 mol %, requirement (3): the weight ratio of the propylene units to the ethylene units in the propylene-ethylene random copolymer portion of the block copolymer (A-1) is from 65/35 to 52/48, requirement (4): the propylene-ethylene random copolymer portion of the block copolymer (A-1) has an intrinsic viscosity [η] EP-A of not less than 2.2 dl/g but less than 4 dl/g.