Exxonmobil Chemical Patents Inc.

Leming Gu

Michael F McDonald, Jr

Michael F Mcdonald

Sunny Jacob

Timothy D Shaffer

Pamela Jean Wright

Yu Feng Wang

Richard Dwight Hembree

Joel Edward Schmieg

Thomas R Barbee

Richard Cheng-Ming Yeh

Joseph A Maier

John A Clark

Mauritz Kelchtermans

Stephen T Dalpe

Richard C M Yeh

Torri L Rose

Mauritz M Kelchtermans

Michael F Mcdonald Jr

A system for producing a functionalized olefinic-based polymer, the system comprising a polymerization zone for producing an olefinic-based polymer comprising a mixing section, a deliquifying section, and a quenching section, wherein at least one section of the polymerization zone has a defined cross-sectional area that continually decreases from a first end to a second end of said section; a devolatilization zone comprising a kneader or extruder, wherein said devolatilization zone is downstream of said polymerization zone and in fluid communication with said polymerization zone; and a functionalization zone downstream of said devolatilization zone and in fluid communication with said devolatilization zone.

System and process for the production of functionalized olefinic-based polymer

Methods of improving Mooney stability of a brominated elastomer comprising: neutralizing a brominated elastomer effluent with a neutralizing agent and water to form a neutralized effluent comprising a hydrocarbon solvent; removing the solvent from the neutralized effluent to form a brominated elastomer slurry; and separating a brominated elastomer from the brominated elastomer slurry, wherein a Mooney stabilizer package comprising an amine-functional hindered amine stabilizer (HAS) and an acid scavenger can be added, together or separately, before the removing step are provided herein. The acid scavenger can comprise a protonatable atom with a pKa greater than the pKa of the HAS nitrogen atom. The separated brominated elastomer can have a delta Mooney of not more than about 10 Mooney units after &#x2dc;7 days at &#x2dc;80&#xb0; C. Stabilized brominated elastomer compositions can be made using this method, and articles can be made from those compositions.

Halogenated elastomers with Mooney viscosity stability and method for preparing same

This invention relates to a method of preparing a brominated elastomer having a stabilized Mooney viscosity. The method includes polymerizing isomonoolefins and at least one polymerizable unit to obtain an elastomer/polymer; brominating the elastomer/polymer to form a brominated elastomer effluent; neutralizing the brominated elastomer effluent to form a neutralized effluent; volatizing off the hydrocarbon solvent; and recovering a brominated elastomer. In at least one point of the process, preferably prior to any significant temperature change in the brominated polymer, a Mooney stabilizer is added into the system. Portions of the Mooney stabilizer may be added at multiple points into the process.

Process for preparing a halogenated elastomer with improved Mooney viscosity stability

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Pearland, TX, United States of America

Leming Gu