Ethylene-propylene elastomeric copolymers with a low content of

Details Ethylene-propylene elastomeric copolymers with a low content of Ethylene-propylene elastomeric copolymers with a low content of

1994-03-31

1996-02-13

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

502127, 526153, 526348, C08F 468, C08F21016

Patent

active

054912083

ABSTRACT:
In an improved process for producing elastomeric ethylene-propylene copolymers with a propylene content comprised within the range of from 22 to 38% by weight and a content of residual chlorine, coming from the co-catalyst, lower than 300 parts per million parts, the polymerization is carried out in suspension in the monomers in the liquid state, with vanadium triacetylacetonate and alkyl-Al compounds, and the obtained polymer is recovered without any washing steps.

REFERENCES:
patent: 3520859 (1970-07-01), Schrage et al.
patent: 3644311 (1972-02-01), Diliddo et al.
patent: 3702840 (1972-11-01), Diliddo et al.
Makromolekulare Chemie, vol. 185, No. 10, Oct. 1984, pp. 2133-2151, E. Giannetti, et al., "Homogeneous Ziegler-Natta Catalysis: Effciency Improvement Of Vanadium Catalyst Systems By Tributyltin Hydride For The Ethylene/Propylene/Diene Terpolymerization".

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