Copolymerization catalyst and process for polymerizing impact re

Details Copolymerization catalyst and process for polymerizing impact re Copolymerization catalyst and process for polymerizing impact re

1984-04-10

1985-09-24

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, 525268, 525323, 526903, 526904, C08F29708

Patent

active

045433895

ABSTRACT:
A process for the preparation of ethylene-propylene impact copolymers at improved catalyst productivity rates involving the formation of a propylene prepolymer by polymerization of propylene in liquid phase in the presence of a catalyst system containing titanium halide supported on magnesium halide and aluminum alkyl complexed with an electron donor. Ethylene and propylene are block polymerized onto the prepolymer in a vapor phase reaction zone in the presence of a second catalyst system comprising a solution of a C.sub.5 -C.sub.9 polyalpha-monoolefin/catalyst/diluent.

REFERENCES:
patent: 3200173 (1965-08-01), Schilling
patent: 3318976 (1967-05-01), Short
patent: 3514501 (1970-05-01), Leibson et al.
patent: 3723403 (1973-03-01), Greaves et al.
patent: 4284738 (1981-08-01), Zukowski
patent: 4334041 (1982-06-01), Zukowski

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