METHOD FOR PRODUCING PROPYLENE BLOCK COPOLYMER

摘要

PROBLEM TO BE SOLVED: To provide a method for efficiently producing a propylene block copolymer composed of a homopolymerization part having a high fluidity and a copolymerization part having a high molecular weight. SOLUTION: This method for producing a propylene block copolymer comprises polymerizing propylene in the presence of (A) a solid catalytic component containing (a) a titanium compound and (b) an electron donor, (B) an organoaluminum compound and (C) an organozinc compound to produce a crystalline polypropylene and than copolymerizing propylene with ethylene and/or a >=4Cα-olefin in the presence of the polypropylene.