Polypropylene composition

摘要

Disclosed are a polypropylene composition comprising 95-55 parts by weight of polypropylene (A) and 5-45 parts by weight of an ethylene/1-butene random copolymer (B-1) which contains constituent units derived from 1-butene in an amount of 15 to 25% by mol; and a polypropylene composition comprising 95-55 parts by weight of polypropylene (A) and 5-45 parts by weight of an ethylene/1-octene random copolymer (B-2) which contains constituent units derived from 1-octene in an amount of 8 to 20% by mol. Each of the random copolymers (B-1) and (B-2) has an intrinsic viscosity [ eta ] of 1.5 to 3.5 dl/g as measured in decalin, a glass transition temperature (Tg) of not higher than -50 DEG C., a crystallinity of less than 20% as measured by X-ray diffractometry, a randomness parameter (B value) of 1.0 to 1.4 as measured by 13C-NMR spectroscopy. With respect to a melting point as measured by a differential scanning calorimeter (DSC) as the main peak, the copolymer (B-1) has a value of not higher than 60 DEG C., while the copolymer (B-2) has a value of not higher than 80 DEG C.