Union Carbide Chemicals & Plastics Technology Corporation

Union Carbide Corporation

Thomas Edward Spriggs

Mark Gregory Goode

Kevin Joseph Cann

Leonard Sebastian Scarola

Duan-Fan Wang

Robert Darrell Olson

Robert Lorenz Boysen

Gary Harry Williams

Robert Cecil Brown

John Henry Moorhouse

Maria A Apecetche

Robert J Bernier

Paul T Daniell

Natarajan Muruganandam

Michael William Tilston

Thomas James McNeil

Robert Joseph Noel Bernier

Gregory George Smith

Frederick John Karol

Robert J Jorgensen

Burkhard Eric Wagner

Jose Fernando Cevallos-Candau

Arthur E Marcinkowsky

Isaac Jacob Levine

Arakalgud V Ramamurthy

George W Schwarz, Jr

William D Heitz

Dale A Wright

James W Nicoletti

James Daniel Madden

Karen E Breetz

Daniel M Hasenberg

Calvin L Edwards

Mark C Hwu

James Laurence Riley, Jr

Wayne R Wilder

A process for polymerizing polyethylene with chromium-based catalysts wherein one or more supported chromium-based catalysts is mixed with mineral oil to form a slurry and the slurry is then introduced into a polymerization reactor, especially a gas-phase polymerization reactor.

Chromium-based catalysts in mineral oil for production of polyethylene

A process for producing polymer in a gas phase reactor by introducing a stream of monomer and gas into a polymerization zone while providing at least one liquid component in the polymerization zone.

Gas phase polymerization process

A falling film of water is applied around the periphery of a fluid bed olefin polymerization reactor to cool the wall and reduce the temperature in the fluid bed near the inside surface of the wall. Cooling has the effect of reducing static in the reactor, which in turn ameliorates a sheeting problem and can enhance production by facilitating control of the relation of the reactor temperature and the dew point of recycled gas. The process may be used concurrently with a gas cooling and condensing recycle system wherein at least some of the condensed recycle gas is injected in the vicinity of the internal wall surface.

Method of modifying near-wall temperature in a gas phase polymerization reactor

A process comprising contacting ethylene and at least one alpha-olefin comonomer having 3 to 8 carbon atoms with a transition metal based catalyst system in two fluidized bed reactors connected in series, in the gas phase, under polymerization conditions, with the provisos that: (a) the first reactor is operated at a temperature at or above the dew point of the mixture of monomers, but no higher than about 5 degrees C. above said dew point; (b) the mixture of ethylene copolymer matrix and active catalyst formed in the first reactor in the series is transferred to the second reactor in the series; (c) other than the active catalyst referred to in proviso (b), no additional catalyst is introduced into the second reactor; (d) in the reactor in which a low melt index copolymer is made:

High activity staged reactor process

A process for producing polyethylene having a broad molecular weight distribution is provided, in which ethylene and optionally a comonomer are contacted in two reactors connected in series, one reactor containing a titanium-based catalyst and the other reactor containing a vanadium-based catalyst and a halohydrocarbon promoter, or alternatively, both reactors containing a mixed metal catalyst comprising both titanium and vanadium. In the latter case, the halohydrocarbon promoter is present in only one of the reactors to activate the vanadium sites of the catalyst and deactivate the titanium sites of the catalyst simultaneously.

Ethylene polymerization using a titanium and vanadium catalyst system in

A gas phase process for the production of a polyethylene blend comprising contacting ethylene and at least one alpha-olefin comonomer having 3 to 8 carbon atoms with a magnesium/titanium based catalyst system including an activator and a cocatalyst in each of two fluidized bed reactors connected in series, under polymerization conditions, with the provisos that:

Process of producing ethylene polymer blends in gas phase

A process comprising continuously contacting with a catalyst, under polymerization conditions, ethylene or a mixture comprising ethylene and one or more alpha-olefins in a first fluidized bed reactor and a mixture comprising ethylene and one or more alpha-olefins in a second fluidized bed reactor, the first and second reactors being connected in series, said catalyst comprising:

High density, high molecular weight polyethylene

A process for the simultaneous trimerization of ethylene and the copolymerization of the trimer with ethylene comprising continuously contacting ethylene, the 1-hexene which is formed, and, optionally, hydrogen in a reaction zone, under trimerization and polymerization conditions, with the supported reaction product of one or more bis-triarylsilyl chromates and one or more trihydrocarbylaluminum compounds wherein the atomic ratio of aluminum to chromium is at least about 3 to 1.

Process for the simultaneous trimerization and copolymerization of

A method for reducing sheeting during polymerization of alpha-olefins by feeding either a positive charge generating or negative charge generating chemical additive to the reactor responsive to particular static levels in the reactor. The chemical additive is added in amounts which neutralize the charges in the reactor.

Method for reducing sheeting during polymerization of alpha-olefins

Growing community of inventors

Cross Lanes, WV, United States of America

Thomas Edward Spriggs