Patent ID: 8211978

Claim:
A moldability modifier comprising: a component (A); and a component (B), wherein a weight ratio of the component (A) to the component (B) (component (A)/component (B)) is from 3/1 to 1/19, the component (A) is a propylene block copolymer comprising from 80 to 98 wt % of a crystalline propylene homopolymer portion (A1) and from 2 to 20 wt % of a propylene/ethylene random copolymer portion (A2), and satisfying that a melt flow rate of the crystalline propylene homopolymer portion (A1) measured according to JIS K7210 at a temperature of 230° C. and under a load of 21.18N is 300 g/10 min or more; that an ethylene content of the propylene/ethylene random copolymer portion (A2) is from 10 to 70 wt %; that an intrinsic viscosity [η] copoly of the propylene/ethylene random copolymer portion (A2) is 6.5 dl/g or more; and that a melt flow rate of the propylene block copolymer (A) as a whole (MFR A ) is 40 g/10 min or more, and the component (B) is a propylene block copolymer comprising from 20 to 79 wt % of a crystalline propylene homopolymer portion (B1) and from 21 to 80 wt % of a propylene/ethylene random copolymer portion (B2), and satisfying that a melt flow rate of the crystalline propylene homopolymer portion (B1) measured according to JIS K7210 at a temperature of 230° C. under a load of 21.18N is 20 g/10 min or more; that an ethylene content of the propylene/ethylene random copolymer portion (B2) is from 20 to 70 wt %; that an intrinsic viscosity [η] copoly of the propylene/ethylene random copolymer portion (B2) is from 2.5 to 9.0 dl/g; and that a melt flow rate of the propylene block copolymer (B) as a whole (MFR B ) is from 0.1 to 50 g/10 min.