POLYPROPYLENE COMPOSITION AND PROCESS FOR PRODUCING THE SAME

摘要

A polypropylene composition which comproses 0.01 to 5 parts by weight of an olefin (co)polymer (a) having an intrinsic viscosity of 15 to 100 dl/g, 100 parts by weight of a propylene homopolymer (b) having an intrinsic viscosity of 0.2 to 10 dl/g, and 28 to 300 parts by weight of an ethylene/propylene copolymer (c) having an intrinsic viscosity of 0.2 to 10 dl/g, and in which the ratio of the melt flow rate of the homopolymer (b) to that of the copolymer (c), MFRPP/MFRRC, is 0.3 to 4 and the product of the ratio of the intrinsic viscosity of the copolymer (c) to that of the homopolymer (b), [ eta ]RC/[ eta ]PP, and the weight ratio of the amount of the homopolymer (b) to that of the copolymer (c), WPP/WRC, is in the range of from 0.2 to 3.0. The composition has a high melt tension and a high crystallization temperature, has excellent thermal stability, and gives a molding excellent in transparency, reduced in molding shrinkage, and excellent in resistance to blushing by impact or bending.