Process of sequentially copolymerizing propylene-ethylene copoly

Details Process of sequentially copolymerizing propylene-ethylene copoly Process of sequentially copolymerizing propylene-ethylene copoly

1984-01-09

1985-05-28

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...

525247, 525268, 525323, C08F29708

Patent

active

045201633

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 further added quantities of aluminum alkyl components.

REFERENCES:
patent: 3200173 (1965-08-01), Schilling
patent: 3318976 (1967-05-01), Short
patent: 3514501 (1970-05-01), Leibson et al.
patent: 4284738 (1981-08-01), Zukowski
patent: 4334041 (1982-06-01), Zukowski
patent: 4380608 (1983-04-01), Hasuo et al.

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