Process of producing ethylene-propylene rubbery copolymer
AssigneeShell Oil Company
InventorsRobert C. Job, Larry L. Sterna
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Abstract
Ethylene-propylene rubbery copolymers having a high degree of random polymerization are produced by employing a high activity, stereoregular polymerization catalyst comprising a titanium halide-containing procatalyst, an organoaluminum compound cocatalyst and a moderately hindered aromatic nitrogen heterocycle as selectivity control agent. The ethylene-propylene copolymer has good properties and exhibits improved processability.
Claims5
In the process of producing an ethylene-propylene rubbery copolymer by contacting ethylene and propylene in the presence of a liquid reaction diluent and a high activity, stereoregular olefin polymerization catalyst comprising a titanium halide-containing procatalyst and an organoaluminum cocatalyst, the improvement of producing ethylene-propylene rubbery copolymer having a high degree of random copolymerization by incorporating in the olefin polymerization catalyst a moderately hindered aromatic nitrogen heterocycle.
- wherein the aromatic nitrogen heterocycle has from 1 to 2 aromatic rings with up to 1 additional heterocyclic atom and a straight-chain alkyl group as substituent on each ring carbon atom adjacent to each heterocyclic nitrogen atom.
Dependencies are inferred from the claim text.