PROPYLENE-BASED BLOCK COPOLYMER

摘要

PROBLEM TO BE SOLVED: To obtain a propylene-based block copolymer having a high impact resistance and good in powder characteristics. SOLUTION: This propylene-based block copolymer comprises a propylene- based block copolymer produced by using an Mg/Ti/halogen-based catalyst comprising an Al compound having 4-10 number of carbon atoms and a silicon compound having an alkoxy group having 2-10 number of carbon atoms and an EPR block having 20-80 wt.% of ethylene content. The content of the EPR block is 20-80 wt.% based on the whole polymer.