Process for continuously producing propylene-ethylene block copo

Details Process for continuously producing propylene-ethylene block copo Process for continuously producing propylene-ethylene block copo

1986-11-07

1988-09-13

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, 525258, 525268, 525323, C08F29708

Patent

active

047711035

ABSTRACT:
A process for continuously producing a propylene-ethylene block copolymer having well-balanced qualities such as high-impact properties, stiffness, processability, etc., with a good productivity, through two polymerization stages using a stereoregular catalyst comprising a Ti-containing solid catalyst and an organoaluminum compound, is provided, which process is characterized in that at the first stage, propylene is mainly fed into two or more polymerization vessels connected in series, to produce 60 to 95% by weight of the total polymerization quantity, and at the second stage, a specified quantity of a glycol ether is added to the polymerization reaction mixture obtained above and ethylene is fed in a relatively large quantity into one or more polymerization vessels, to produce 5 to 40% by weight of the total polymerization quantity.

REFERENCES:
patent: 4380608 (1983-04-01), Hasuo et al.
patent: 4483971 (1984-11-01), Sato et al.

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