Patent ID: 8008401

Claim:
A polyolefin composition comprising: (A) a syndiotactic α-olefin-based copolymer, (B) a polyolefin resin selected from the group consisting of polypropylene, a propylene/ethylene random copolymer and a propylene/ethylene block copolymer, and (C) polybutene, wherein the syndiotactic α-olefin-based copolymer (A) has properties that regarding absorptions of methyl groups of propylene units in 13 C-NMR of the copolymer (A) measured in a 1,2,4-trichlorobenzene solution, the sum total of absorption intensities of peaks observed at 20.0 to 21.0 ppm on the basis of tetramethylsilane is not less than 0.5 of the absorption intensities at 19.0 to 22.0 ppm assigned to all the methyl groups of propylene; the copolymer (A) comprises: (a-1) repeating units derived from propylene, (a-2) repeating units derived from ethylene, and if necessary, (a-3) repeating units derived from an olefin of 4 to 20 carbon atoms, and/or (a-4) repeating units derived from at least one polyene selected from conjugated polyenes and non-conjugated polyenes; the copolymer (A) contains the units (a-1) in amounts of 30 to 79% by mol, the units (a-2) in amounts of 1 to 30% by mol, the units (a-3) in amounts of 0 to 50% by mol, (with the proviso that the units (a-2) and the units (a-3) are contained in the total amount of 21 to 70% by mol in 100% by mol of the total amount of the units (a-1), the units (a-2) and the units (a-3)), and the units (a-4) in amounts of 0 to 30% by mol based on 100% by mol of the total amount of the units (a-1), the units (a-2) and the units (a-3)); and the copolymer (A) substantially has a syndiotactic structure; and wherein the polyolefin resin (B) is either syndiotactic or isotactic, which has a content of repeating units derived from propylene of not less than 80% by mol.