Preparation of propylene/ethylene polymers

Details Preparation of propylene/ethylene polymers Preparation of propylene/ethylene polymers

1989-04-12

1991-04-09

Marquis, Melvyn I.

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

Synthetic resins

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

525247, 525270, 525323, C08F 414

Patent

active

050066005

ABSTRACT:
Propylene/ethylene polymers are prepared by a process in which, in each case in the presence of hydrogen and by means of gas phase polymerization, first (A), in a first polymerization zone, propylene is homopolymerized, and the resulting propylene homopolymer is introduced into (B) a second polymerization zone, where a mixture of propylene and ethylene is then polymerized with the reaction product obtained in (A). In this process, ethylene is homopolymerized in a further polymerization zone (C), likewise by gas phase polymerization, with certain provisos, and the resulting reaction product is likewise fed to the second polymerization zone (B).

REFERENCES:
patent: 3974237 (1976-08-01), Brumbaugh et al.
patent: 4128606 (1978-12-01), Furutachi et al.
patent: 4297445 (1981-10-01), Short et al.
patent: 4334041 (1982-06-01), Zukowski
patent: 4454299 (1984-06-01), Schweier et al.
patent: 4455405 (1984-06-01), Jaggard et al.

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