PURPOSE: To obtain the subject copolymer excellent in impact resistance, rigidity, and slipperiness, and useful for moldings, etc., by block-copolymerizing PP with propylene.ethylene copolymer produced in the presence of a specific organic silicon compound, the PP being produced under a specific catalyst.
CONSTITUTION: Highly crystalline PP preferably in an amount of 70-95wt.% is block-copolymerized with propylene-ethylene copolymer preferably in an amount of 30-5wt.% to provide the objective copolymer. The highly crystalline PP is produced by polymerizing propylene in the presence of a polymerization catalyst comprising (A) a solid catalyst component containing magnesium, titanium, a halogen and an electron-donating compound as essential components, (B) an organometallic compound, and (C) an organosilicon compound having a Si-O-C bond.
IMANISHI KUNIHIKO
UEKI SATOSHI
SAITO HIROO
TAKI NORIYUKI
ISHIHARA TAKESHI
