Patent ID: 7189788

Claim:
A polyolefin-based resin composition comprising: (A) 99.7 to 82% by mass of a propylene copolymer having (a) a melt flow rate (MFR) of 0.1 to 200 g/l 10 min, (b) a meso-pentad fraction [mmmm] of an ordinary temperature (25° C.) xylene-insoluble component of 97.0% or higher, and (c) a content of an ordinary temperature (25° C.) xylene-soluble component of 4 to 50% by mass; and (B) 0.3 to 18% by mass of a copolymer containing propylene chains of an isotactic structure, and copolymer chains constituted from at least two monomer units selected from the group consisting of ethylene, C 3 to C 20 α-olefins, cyclic olefins and aromatic vinyl monomers which are graft-bonded and/or block-bonded to said copolymer, wherein the propylene chains of an isotactic structure contained in said component (B) have a meso-pentad fraction [mmmm] of 40 to 99.9%, and said component (B) has an intrinsic viscosity [η] of 0.05 to 10 dl/g as measured at 135° C. in decalin, and contains polypropylene moieties in an amount of 40 to 98% by mass based on the amount of the copolymer (B).