Method for producing an .alpha.-olefin block copolymer

Details Method for producing an .alpha.-olefin block copolymer Method for producing an .alpha.-olefin block copolymer

1987-07-20

1989-02-28

Briggs, Sr., Wilbert J.

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

Synthetic resins

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

524267, 524269, 524536, 524731, 524254, 524270, C08F29708

Patent

active

048086673

ABSTRACT:
A method for producing an .alpha.-olefin block copolymer, which comprises polymerizing propylene alone or together with a small amount of other .alpha.-olefin in the presence of a catalyst comprising a titanium-containing solid catalyst component and an organoaluminum compound, and then polymerizing the resulting propylene polymer with an .alpha.-olefin other than propylene, alone or together with propylene in a gas phase without deactivating the catalyst, characterized in that the gas phase polymerization is conducted in the presence of a siloxane or a polysiloxane in an amount of from 1.times.10.sup.-6 to 0.1 by weight ratio relative to the weight of said propylene polymer.

REFERENCES:
patent: 4380608 (1983-04-01), Hasuo et al.
patent: 4547552 (1985-10-01), Toyota et al.

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