| abstract |
(57) [Summary] (Revised) [Purpose] A polypropylene composition having excellent rigidity and heat resistance as well as impact resistance, especially at low temperatures. [Constitution] (A) polypropylene; 95 to 55 parts by weight, (B-1) The constitutional unit derived from 1-butene is 15 to 25 The ethylene / 1-butene random copolymer, which is a mol%; or (B-2) the constitutional unit derived from 1-octene is 8 to 20 mol% of ethylene / 1-octene random copolymer; 5 to 45 parts by weight. (B-1) and (B-2) Has a decalin intrinsic viscosity [η] of 1.5 to 3.5 dl / g, a melting point (B-1) measured by DSC method as a main peak is 60 ° C. or lower, and (B-2) is 80 ° C or lower, a glass transition temperature (Tg) of -50 ° C or lower, The crystallinity measured by the X-ray diffraction method is less than 20%, and the randomness parameter (B value) determined by the 13 C-NMR method is 1.0 to 1.4. |