Patent ID: 7847010

Claim:
A polypropylene resin composition comprising 100 parts by weight of a polypropylene resin material to be modified and 1 to 25 parts by weight of a molding appearance modifier (A), which molding appearance modifier comprises as an effective component a propylene block copolymer which has a crystalline propylene polymer portion and a propylene-ethylene random copolymer portion, and satisfies the following requirements (a) to (d): (a) the crystalline propylene polymer portion has an intrinsic viscosity [η] homo not greater than 1.2 dl/g as measured at 135° C. by using decalin as a solvent, (b) the propylene-ethylene random copolymer portion has an ethylene content of from 30 to 70 wt. %, has an intrinsic viscosity [η] copoly of from 2.5 to 7.0 dl/g, and is contained in an amount of from 40 to 80 wt. % in the whole propylene block copolymer, and (c) the propylene block copolymer has, in its entirety, a melt flow rate ranging from 0.1 to 10 g/10 min, and (d) a ratio ([η] copoly /[η] homo ) of the intrinsic viscosity [η] copoly of the propylene-ethylene random copolymer portion to the intrinsic viscosity [η] homo of the crystalline propylene polymer portion falls within a range of from 2.5 to 10.