POLYPROPYLENE COMPOSITIONS HAVING EXCELLENT IMPACT-RESISTANCE AND PRESS-RESISTANCE

摘要

PURPOSE: A polypropylene composition is provided to manufacture a pipe and components with excellent pressure resistance in high temperatures, flexibility, and low temperature impact properties. CONSTITUTION: A polypropylene composition comprises ethylene-propylene random-elastomer composition, and a B-crystal generator. The comprise ethylene-propylene random-elastomer composition contains a random copolymer of which ethylene content is 0.5-10 weight%, melt index is 0.1-5 g/10min, and ethylene-propylene elastomer of which ethylene content is 25-75%. In the polypropylene composition, the relative weight ratio of the ethylene-propylene random copolymer and ethylene-propylene elastomer is 95-99.9 : 0.1-5.