POLYPROPYLENE-BASED BLOCK COPOLYMER COMPOSITION HAVING EXCELLENT TRANSPARENCY AND LOW TEMPERATURE IMPACT RESISTANCE FOR INJECTION MOLDING

摘要

Disclosed is a polypropylene resin composition having improved transparency, softness characteristics and low-temperature impact strength while maintaining the advantages such as chemical resistance and moldability of polypropylene, and a process for producing the same. (A) 80 to 95% by weight of a terpolymer copolymerized with 90 to 98% by weight of propylene, 1 to 5% by weight of ethylene and 1 to 5% by weight of 1-butene, 60 to 85% From 5 to 20% by weight of a propylene, from 10 to 35% by weight of ethylene and from 1 to 5% by weight of 1-butene copolymerized with 80 to 97% by weight of a block copolymer block; And (b) 3 to 20% by weight of an atactic polypropylene having a weight average molecular weight of 50,000 to 1,000,000 and a stereoregularity (isotacticity, pentad II, mmmm) of 5 to 15%; and a polypropylene resin composition / RTI