| 摘要 |
The invention provides a resin composition which is excellent in flowability and subsequent processibility, easy in forming large and thin-filmed injection article, and remarkable in rigidness and impact intensity due to prominent characteristics of polypropylene and ethyl-propyl copolymer with high crystallinity. The invention provides ethyl-propyl block copolymer polypropylene resin compositioncomposed of 100 weights by percent of polypropylene and 0.05 to 0.3 weights by percent of nucleating agent (c) and having melt index of 80 to 120 g/10 minutes, the polypropylene is composed of 80 to 95 weights by percent of high crystallinity homopolymerized polypropylene (A) having isotactic five unit group fractions of above 96% and 5 to 20 weights by percent of ethyl-propyl elastic copolymer (B) in which mole ratio of ethyl to (ethyl+propyl) is 0.15 to 0.40, the proportion (A/B) of absolute viscosities of the high crystallinity homopolymerized polypropylene (A) and the ethyl-propyl elasticcopolymer (B) is 0.09 to 0.33.
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