Process for the production of ethylene-propylene elastomeric copolymers
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United States of America Patent
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Sep 8, 1998
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app pub date -
Sep 16, 1996
filing date -
Sep 14, 1995
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Abstract
Process for the preparation in liquid phase of copolymers of ethylene with propylene and optionally another diene, in the presence of a catalyst selected from (a) Titanium salt supported on magnesium salt and (b) compound of Vanadium soluble in hydrocarbon solvents either supported on an inert material or prepolymerized, and a co-catalyst essentially consisting of an organic compound of Aluminium, and a possible chlorinated activator, characterized in that: 1) when the polymerization is almost complete, a solid material insoluble in the reaction environment and having an average diameter of between 0.001 and 200 microns is added to the reaction mixture; 2) the suspension of polymer and solid material are kept in contact for a sufficient time to obtain perfectly free-flowing polymeric particles; 3) the perfectly free-flowing polymeric particles of step (2) are recovered.
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