Exxonmobil Chemical Patents Inc.

Scott Thomas Milner

Robert Norman Webb

Timothy Daniel Shaffer

Michael Francis McDonald

David Yen-Lung Chung

David John Lohse

Michael Gerard Matturro

Michael F McDonald, Jr

Cesar Alberto Garcia-Franco

Lewis J Fetters

Nikos Hadjichristidis

Robert A Mendelson

David W Mead

Timothy D Shaffer

Richard Dwight Hembree

D Shaffer Timothy

N Webb Robert

D Hembree Richard

Provided for herein is a process to produce an essentially homogeneous single liquid phase hydrocarbon-rubber cement from a polymer slurry comprising a hydrocarbon-rubber, a diluent, and unreacted monomer(s), the process comprising:

Process to produce a hydrocarbon rubber cement utilizing a hydrofluorocarbon diluent

Methods for producing elastomers or elastomeric compositions are provided. One or more Cto Cisoolefins and one or more comonomers can be polymerized in the presence of a diluent comprising one or more hydrofluorocarbons to provide a slurry comprising polymer product, unreacted monomer and the diluent. The slurry can be extruded to separate at least a portion of the diluent from the polymer product. The separated diluent can be recycled for polymerizing the one or more Cto Cisoolefins.

Separation of polymer slurries

The invention provides for a process to produce polymers utilizing a hydrofluorocarbon diluent.

Polymerization processes

Provided for herein is a process for separating a hydrocarbon-rubber from a hydrofluorocarbon diluent comprising contacting a polymer slurry comprising the hydrocarbon-rubber dispersed within the hydrofluorocarbon diluent with a hydrocarbon solvent capable of dissolving the hydrocarbon-rubber, to produce a first liquid phase and a second liquid phase, and separating the first liquid phase from the second liquid phase.

Phase separation process utilizing a hydrofluorocarbon

The invention relates to new polymerization processes including diluents including hydrofluorocarbons and their use to produce novel polymers substantially free of long chain branching. In particular, the invention relates to copolymers of an isoolefin, preferably isobutylene, and a multiolefin, preferably a conjugated diene, more preferably isoprene, substantially free of long chain branching.

Polymers substantially free of long chain branching

The invention provides for polymerization processes to produce polymers utilizing boiling pool reactor systems and diluents including hydrofluorocarbons.

The invention relates to new processes to produce polymers utilizing bayonette cooled slurry reactor systems and diluents including hydrofluorocarbons.

The invention is directed to essentially saturated hydrocarbon polymer composition comprising essentially saturated hydrocarbon polymers having A) a backbone chain; B) a plurality of essentially hydrocarbyl sidechains connected to A), said sidechains each having a number-average molecular weight of from 2500 Daltons to 125,000 Daltons and a MWD by SEC of 1.0-3.5; and having A) a Newtonian limiting viscosity (&eegr; ) at 190&deg; C. at least 50% greater than that of a linear olefinic polymer of the same chemical composition and weight average molecular weight, preferably at least twice as great as that of said linear polymer, B) a ratio of the rubbery plateau modulus at 190&deg; C. to that of a linear polymer of the same chemical composition less than 0.5, preferably <0.3, C) a ratio of the Newtonian limiting viscosity (&eegr; ) to the absolute value of the complex viscosity in oscillatory shear (&eegr;*)at 100 rad/sec at 190&deg; C. of at least 5, and D) a ratio of the extensional viscosity measured at a strain rate of 1 sec , 190&deg; C., and time&equals;3 sec (i.e., a strain of 3) to that predicted by linear viscoelasticity at the same temperature and time of 2 or greater. Ethylene-butene prepared by anionic polymerization and hydrogenation illustrate and ethylene-hexene copolymers prepared by coordination polymerization illustrate the invention. The invention polymers exhibit improved processing characteristics in that the shear thinning behavior closely approaches that of ideal polymers and exhibit improved strain thickening.

Processing olefin copolymers

The invention is directed to essentially saturated hydrocarbon polymer composition comprising essentially saturated hydrocarbon polymers having A) a backbone chain, B) a plurality of essentially hydrocarbyl sidechains connected to A), said sidechains each having a number-average molecular weight of from 2500 Daltons to 125,000 Daltons and a MWD by SEC of 1.0-3.5; and having A) a Newtonian limiting viscosity (&eegr; ) at 190&deg; C. at least 50% greater than that of a linear olefinic polymer of the same chemical composition and weight average molecular weight, preferably at least twice as great as that of said linear polymer, B) a ratio of the rubbery plateau modulus at 190&deg; C. to that of a linear polymer of the same chemical composition less than 0.5, preferably <0.3, C) a ratio of the Newtonian limiting viscosity (&eegr; ) to the absolute value of the complex viscosity in oscillatory shear (&eegr;*)at 100 rad/sec at 190&deg; C. of at least 5, and D) a ratio of the extensional viscosity measured at a strain rate of 1 sec , 190&deg; C., and time&equals;3 sec (i.e., a strain of 3) to that predicted by linear viscoelasticity at the same temperature and time of 2 or greater. Ethylene-butene prepared by anionic polymerization and hydrogenation illustrate and ethylene-hexene copolymers prepared by coordination polymerization illustrate the invention. The invention polymers exhibit improved processing characteristics in that the shear thinning behavior closely approaches that of ideal polymers and exhibit improved strain thickening.

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Somerville, NJ, United States of America

Scott Thomas Milner