Exxonmobil Chemical Patents Inc.

Deborah J Davis

Timothy D Shaffer

David Y Chung

Robert Norman Webb

Michael F McDonald, Jr

Pamela Jean Wright

James Peter Stokes

Michael F Mcdonald

Copolymer are formed by polymerizing Cto Cisoolefin monomers and alkyl-styrene monomers. The method comprises first providing feed streams into a reactor. The various feed streams provide monomers, a polar diluent or polar diluent mixture, and a catalyst system into the reactor. In the reactor, the feed streams contact one another so that the monomers form a polymer in a stable slurry, wherein the amount of polymer in the slurry yields a slurry concentration greater than 22 wt %. The ratio of moles of polymer formed per mole initiator is in the range of 0.25 to 4.0 moles polymer per mole of initiator.

Methods of production of alkylstyrene/isoolefin polymers

The disclosure provides for a process and polymerization system to produce isoolefin polymers () utilizing polymorphogenates () in the catalyst system to control polydispersity (MWD). The disclosure also provides a catalyst system () comprising a plurality of active catalyst complex species () formed by combination of a Lewis acid (), an initiator () and a polymorphogenate (), as well as polymers made using the catalyst system or process. The polymorphogenate () can promote or mimic the formation of different active catalyst complex species () having different polymerization rates, i.e. different rates of propagation, chain transfer, or termination, as observed by different polydispersities resulting from the presence of relatively different proportions of the polymorphogenate.

Polydispersity-controlled isoolefin polymerization with polymorphogenates

The disclosure provides a slurry polymerization system and method to decrease polymer deposition on reactor surfaces using an oxygenate such as alcohol () supplied to the polymerization medium () separate from the catalyst feed ().

Method and apparatus for decreasing polymer deposition

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Pasadena, TX, United States of America

Deborah J Davis