Process for continuously producing propylene-based block copolym

Details Process for continuously producing propylene-based block copolym Process for continuously producing propylene-based block copolym

1997-04-16

1999-01-12

Mullis, Jeffrey

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525323, 526 65, 526 67, 526 68, C08F25502, C08F 234, C08F 236

Patent

active

058591435

ABSTRACT:
A process for continuously producing a propylene-based block copolymer having an excellent impact resistance of the present invention, comprises:
a first polymerization step comprising polymerizing .alpha.-olefin comprising propylene in the presence of hydrogen and a stereoregular polymerization catalyst comprising a solid catalyst component containing magnesium, titanium, halogen atom and an electron-donor compound, an organoaluminum compound and, if required, an electron-donar compound in a single polymerization reactor; and
a second polymerization step comprising transporting .alpha.-olefin polymer obtained in the first polymerization step to a copolymerization reactor and copolymerizing propylene with .alpha.-olefin other than propylene in a gas phase substantially in the presence of said stereoregular polymerization catalyst used in the first polymerization step.

REFERENCES:
patent: 5324784 (1994-06-01), Fujita et al.
patent: 5473021 (1995-12-01), Koura et al.
patent: 5618886 (1997-04-01), Shinozaki et al.

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