Process for producing propylene block copolymer

Details Process for producing propylene block copolymer Process for producing propylene block copolymer

1985-09-12

1988-04-19

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...

525247, 525249, 525259, 525261, 525266, 525323, C08F 428, C08F29708

Patent

active

047390158

ABSTRACT:
A process for producing a propylene block copolymer in the presence of a highly stereospecific olefin polymerization catalyst which comprises producing a crystalline polymer or copolymer of propylene in a first stage and random-copolymerizing propylene and another alpha-olefin in a mole ratio of from 10:90 to 90:10 in the presence of the propylene polymer or copolymer in a second stage; wherein in the random copolymerization, 0.0001 to 0.5 mole, per gram atom of aluminum in the catalyst, of an oxygen-containing compound being gaseous in a standard condition or 0.001 to 1 mole, per gram atom of aluminum in the catalyst, of an active hydrogen-containing compound being liquid or solid in a standard condition is fed into the random-copolymerization reaction system.

REFERENCES:
patent: 3970719 (1976-07-01), Edmonds
patent: 4380608 (1983-04-01), Hasuo et al.

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