Exxonmobil Chemical Patents Inc.

Exxon Chemical Patents, Inc.

Other

Chevron Oronite Company LLC

Periagaram Srinivasan Ravishankar

Sudhin Datta

Narayanaswami R Dharmarajan

Rainer Kolb

Jo Ann M Canich

Charles C Cozewith

Edmund J Stachowski, Iii

Maria Dolores Ellul

Peijun Jiang

Rhutesh K Shah

Francis Charles Rix

Jianya Cheng

Phillip Thomas Matsunaga

George Rodriguez

Eric Paul Jourdain

Weiguo Hu

Kent Leon Chasey

Charles Douglas Burrage

Wen Li

Bruce Alan Harrington

Adriana S Silva

Florin Barsan

Paul Edward McDaniel

Andy Haishung Tsou

Donald R Hazelton

Jean-Roch H Schauder

Abdelhadi Sahnoune

George James Pehlert

Bruce Allan Harrington

Yu Feng Wang

Alexander I Norman

Lawrence G Kaufman

Guy Joseph Wouters

Rui Zhao

Arturo Leyva

Kirk Nass

Syamal Tallury

Luke P Stephens

Aaron H Reed

Douglas A Berti

Machteld Maria Mertens

Anthony Jay Dias

Matthew Cornyn Kuchta

Robert E Medsker

Chia Yung Cheng

Porter Clarke Shannon

Suzzy C Ho

Sabet Abdou-Sabet

Jingwen Zhang

David L Morgan

Oscar Oansuk Chung

Srivatsan Srinivas Iyer

John Patrick Soisson

Srivatsan Watson Srinivas

Kuo-Shein Shen

Man Hon Tsang

Michael Charles Bulawa

Gary W Gilbertson

Ian G Elliott

Maryam Sepehr

Sara Yue Zhang

N Raja Dharmarajan

Giandomenico Stella

Rul Zhao

Quintin P Costin

Ronald L Hazelton

Karine Vincent

Ronald Lewis Hazelton

Majia Y Amin

Patrick S Byrne

Lisa B V Stefaniak

Lisa B Stefaniak

Quintin Paul Ward Costin

Ranier Kolb

Narayanaswami Raja Dharmarajan

Kirk A Nass

Majia Amin

Lisa BV Stefaniak

Machteld M Mertens

Paul E Mcdaniel

Lawrence George Kaufman

Lubricating oil compositions are provided which contain bimodal copolymer compositions, and in particular bimodal ethylene-α-olefin copolymer compositions. The copolymer compositions comprise first and second ethylene-α-olefin copolymer components. The bimodal compositions are particularly useful as viscosity or rheology modifiers, e.g., in lubricating oil compositions. Lubricating oil compositions comprising the copolymer compositions advantageously exhibit enhanced shear stability index (SSI) and thickening efficiency (TE) values, while maintaining excellent low-temperature properties such as pour point, mini-rotary viscometer viscosity, and cold crank simulation performance.

Bimodal copolymer compositions useful as oil modifiers and lubricating oils comprising the same

Processes are provided which include copolymerization using two different metallocene catalysts, one capable of producing high Mooney-viscosity polymers and one suitable for producing lower Mooney-viscosity polymers having at least a portion of vinyl terminations. The two catalysts may be used together in polymerization to produce copolymer compositions of particularly well-tuned properties. For instance, polymerizations are contemplated to produce high-Mooney metallocene polymers that exhibit excellent processability and elasticity, notwithstanding their high Mooney viscosity. Other polymerizations are also contemplated in which lower-Mooney metallocene polymers are produced, which also exhibit excellent processability and elasticity, while furthermore having excellent cure properties suitable in curable elastomer compound applications. Many of the contemplated polymerizations include controlling the ratio of the two metallocene catalysts used in the polymerization so as to obtain the desired Mooney viscosity and desired rheology (indicated by Mooney Relaxation Area) of the copolymer compositions.

Dual metallocene catalyst copolymer compositions

This application relates to copolymer compositions and copolymerization processes, as well as to lubricating oil compositions comprising such copolymer compositions as viscosity index improvers, and base oil. The copolymer compositions may be made using two different metallocene catalysts: one capable of producing high molecular weight copolymers; and one suitable for producing lower molecular weight copolymers having at least a portion of vinyl terminations, and the copolymer compositions produced thereby. Copolymer compositions may comprise (1) a first ethylene copolymer fraction having high molecular weight, exhibiting branching topology, and having relatively lower ethylene content (based on the weight of the first ethylene copolymer fraction); and (2) a second ethylene copolymer fraction having low molecular weight, exhibiting linear rheology, and having relatively higher ethylene content (based on the weight of the second ethylene copolymer fraction). Lubricating oil compositions comprising such copolymer compositions may exhibit superior viscosity properties.

Lubricating oil compositions comprising dual metallocene-catalyzed bimodal copolymer compositions useful as viscosity modifiers

This application relates to copolymer compositions and copolymerization processes. The processes may use two different metallocene catalysts: one capable of producing high molecular weight copolymers; and one suitable for producing lower molecular weight copolymers having at least a portion of vinyl terminations, and the copolymer compositions produced thereby. Copolymer compositions may comprise (1) a first ethylene copolymer fraction having high molecular weight, exhibiting branching topology, and having relatively lower ethylene content (based on the weight of the first ethylene copolymer fraction); and (2) a second ethylene copolymer fraction having low molecular weight, exhibiting linear rheology, and having relatively higher ethylene content (based on the weight of the second ethylene copolymer fraction). It is believed that the unique combination of these properties provides a copolymer composition with advantageous viscosity modifying properties, such as an excellent combination of shear thinning and fuel economy, as well as high thickening efficiency.

Dual metallocene-catalyzed bimodal copolymer compositions

A method of forming a blown film comprising extruding a molten composition through a die opening to form a film; wherein the molten composition comprises at least one polyethylene and within the range from 0.10 wt % to 10 wt % of a cyclic-diene terpolymer by weight of the composition; causing the film to progress in a direction away from the die opening; cooling the film at a distance from the die opening, the distance adjusted to effect the properties of the film; and isolating a blown film therefrom.

Cyclic-diene additives in polyethylene films and enhanced film orientation balance in production thereof

Provided herein are polymerization processes and polymer compositions including reactor blends formed by such polymerization processes. The polymerization processes include copolymerization using two metallocene catalyst systems: the first catalyst system capable of producing polymers having 60% or more vinyl terminations, the second catalyst system capable of producing high molecular weight polymers, preferably incorporating at least some of the polymers produced by the first catalyst system into the high molecular weight polymers. The reactor blends formed thereby therefore include first and second copolymer components, which may differ in monomer content and weight-average molecular weight (Mw). Furthermore, the reactor blends may exhibit advantageous rheological properties, at least some of which are consistent with long-chain branching. Preferred reactor blends comprise ethylene-propylene-diene (EPDM) terpolymers.

Polymer compositions and processes for their production

A process for producing a thermoplastic vulcanizate, the process comprising: (i) charging a reactor with an oil-extended olefinic copolymer rubber, where the rubber is synthesized by a single-site catalyst, characterized by a multi-modal molecular weight distribution, and includes greater than 10 parts by weight extender oil per 100 parts by weight rubber; (ii) charging the reactor, contemporaneously or sequentially with respect to the rubber, with a thermoplastic resin, an oil, and a cure system to provide a pre-vulcanized mixture; and (iii) mixing the rubber, thermoplastic resin, oil, and cure system at a temperature above the melt temperature of the thermoplastic resin to thereby cause dynamic vulcanization of the rubber and produce the thermoplastic vulcanizate.

Thermoplastic vulcanizate prepared with oil-extended, bimodal metallocene-synthesized EPDM

Processes are provided which include copolymerization using one or both of a metallocene catalyst capable of producing high molecular weight polymers and a metallocene catalyst capable of producing polymers having 60% or more vinyl terminations. Polymerization processes include dual catalyst polymerization in a single polymerization zone comprising both metallocene catalysts. Other processes include serial or parallel polymerizations in multiple polymerization zones, using either or both catalysts in each polymerization zone. Such polymerization processes produce reactor blends, and are particularly suited for producing copolymer compositions (such as EP or EPDM copolymer compositions) exhibiting improved melt elasticity and rheological properties.

Process for producing polymer compositions

Provided herein are metallocene-catalyzed polymer compositions that exhibit advantageous rheological properties, at least some of which are consistent with long-chain branching, as well as polymerization processes suitable for forming such polymer compositions. The polymer compositions may have both LCB index measured at 125&#xb0; C. of less than 5; and phase angle &#x3b4; at complex shear modulus G*=100,000 Pa of less than about 54.5&#xb0;, as determined at 125&#xb0; C. The polymer compositions of particular embodiments are reactor blends, preferably of ethylene copolymers (e.g., ethylene-propylene (EP) copolymers and/or ethylene-propylene-diene (EPDM) terpolymers). The reactor blend may include first and second copolymer components, which may differ in monomer content and weight-average molecular weight (Mw).

Polymer compositions with improved rheological properties

The present disclosure is directed to polymer compositions that can be useful as viscosity modifiers, comprising (a) a first ethylene-&#x3b1;-olefin copolymer having an ethylene content of from about 60 to about 80 wt % and (b) a second ethylene-&#x3b1;-olefin copolymer having an ethylene content of from about 40 to about 60 wt %. The polymer composition comprises about 35 wt % to about 50 wt of the first ethylene-&#x3b1;-olefin copolymer and about 50 wt % to about 65 wt % of the second ethylene-&#x3b1;-olefin copolymer. The polymer compositions are made by comprising producing a first ethylene-&#x3b1;-olefin copolymer in a first reactor, directing the first copolymer to a second reactor, producing the second ethylene-&#x3b1;-olefin copolymer in the second reactor and forming the polymer composition.

Polymer compositions and methods of making them

A polyethylene composition including the product of the combination of at least one copolymer made from units derived from at least 85 wt % ethylene and a Cto C&#x3b1;-olefin and from 0.10 wt % to 10 wt % of a cyclic-diene terpolymer is provided.

Polyethylene compositions

This disclosure relates to a process for polymerization, and in particular to minimizing undesired polymerization reactions downstream of a polymerization reaction zone, for instance by use of a quenching agent that enables fast reaction rates with active polymerization catalyst in the polymerization effluent, so as to quench the catalyst quickly, thereby preventing uncontrolled polymerization reactions. A preferred quenching agent is methanol. Also provided are means for treating polymer recycle streams containing oxygenates, which may result from the use of such quench agents, particularly in polymerization processes including polyene (e.g., diene) monomers.

Mitigation of catalyst inhibition in olefin polymerization

Growing community of inventors

Kingwood, TX, United States of America

Periagaram Srinivasan Ravishankar