Dow Global Technolgoies LLC

Union Carbide Chemicals & Plastics Technology Corporation

Univation Technologies, LLC

W. R. Grace Co.-conn.

Roger B Painter

Jan Willem Van Egmond

Ping P Cai

Joseph N Coalter, Iii

Kiu H Lee

Paul C Vosejpka

David Mason Gaines

Lewis J Fouts, Jr

Gyung-Ho Song

Linfeng Chen

Richard E Campbell, Jr

F David Hussein

Robert Reib

Curt N Theriault

David Merrill Rebhan

Ian D Burdett

Michael W Tilston

Billy Jack Garner

Joel D Wieliczko

Philip Everett Harrison

Bill Jack Garner

Zuzanna Kulik

William Jene Price

Robert N Reib

Ping W Cai

Joseph N Iii Coalter

A process for producing a heterophasic copolymer is provided. The process includes introducing an antifoulant to a second polymerization reactor which operates in series with a first polymerization reactor. The antifoulant may be a multicomponent antifoulant and/or a coating agent. Provision of either antifoulant enables the production of a heterophasic copolymer with an Fc value from about 10% to about 50% by inhibiting reactor fouling during polymerization.

Antifoulant for impact copolymers and method

A process for polymerizing one or more olefins in a gas-phase polymerization reactor is provided. The gas-phase reactor has a fluidized bed and a fluidizing medium. The fluidizing medium has an operating density and an operating velocity. The process includes determining a critical gas velocity and/or determining a critical gas velocity for the polymerization. The operating gas density and/or the operating gas velocity for the fluidizing medium is then adjusted to be less than or equal to its respective critical value. The process includes increasing the bulk density of the fluidized bed. The increase in the fluidized bed bulk density increases productivity without increasing reactor residence time.

Gas-phase polymerization process

A continuous gas phase circulating bed reactor, including: a riser for contacting a catalyst and a first gas composition comprising an olefin to form a polyolefin under fast-fluidization regime or a dilute-phase pneumatic conveying regime conditions; a downer for contacting the catalyst and a second gas composition comprising an olefin to form additional polyolefin under fast fluidization regime or a dilute-phase pneumatic conveying regime conditions; and a transport section for conveying at least a portion of the catalyst, polyolefin, and additional polyolefin from the downer to the riser. Also disclosed is a polymerization process using such a circulating bed reactor.

Circulating fluidized bed reactor

A supported catalyst composition and process for preparing high molecular weight polymers of one or more addition polymerizable monomers, especially propylene, said composition comprising:

Supported catalysts for manufacture of polymers

A process for the polymerization of olefin monomers comprising contacting ethylene or a mixture of ethylene and one or more C&#x3b1; olefins with a catalyst composition comprising one or more Group 3-10 transition metal containing, Ziegler-Natta, procatalyst compounds; one or more alkylaluminum cocatalyts; and one or more polymerization control agents, said process being characterized in that at least one such polymerization control agent is an alkyl or aryl, ester of an aliphatic or aromatic (poly)carboxylic acid optionally containing one or more substituents comprising a Group 13, 14, 15, or 16 heteroatom.

Catalyst composition for ethylene polymerization

A catalyst composition, method of formation and process of use in the polymerization of olefin monomers, said composition comprising a catalyst compound, an activator capable of converting said catalyst compound into an active catalyst for addition polymerization, optionally a carrier, further optionally a liquid diluent, and a hydroxycarboxylate metal salt additive.

Morphology controlled olefin polymerization process

A supported catalyst composition and process for preparing high molecular weight polymers of one or more addition polymerizable monomers, especially propylene, said composition comprising: 1) a substrate comprising the reaction product of a solid, particulated, high surface area, metal oxide, metalloid oxide, or a mixture thereof and an organoaluminum compound, 2) a Group 4 metal complex of a polyvalent, Lewis base ligand; and optionally, 3) an activating cocatalyst for the metal complex.

A method of reducing the purge gas consumption, dry-down time, or both required for start-up and operation of a gas phase fluidized bed reactor system. The method involves contacting a stream of cycle gas having water and/or a polar hydrocarbon with an adsorbing material while the cycle gas is in a closed circulation loop.

Process for drying a reactor system employing a fixed bed adsorbent

A improved process is provided for polymerization of olefin and/or diolefin polymer, using sonic cleaning devices, with optimum design and operation, to eliminate or reduce reactor fouling and/or sheeting.

Gas phase fluidized bed polymerization process using sonic cleaner with

An improved method for polymerizing one or more polyolefins in the presence of a transition metal catalyst in at least one gas phase fluidized bed reactor, the improvement comprises generating at least one low frequency, high pressure sound wave inside a reactor system, which wave has sufficient frequency and pressure to dislodge and/or prevent particle build-up on interior surfaces of the reactor system.

Gas phase fluidized bed polyolefin polymerization process using sound

An improved method for polymerizing one or more polyolefins in the presence of a transition metal catalyst in at least one gas phase reactor having an expanded section, the improvement comprising generating a tangential flow of gas or gas-solids in the expanded section of the gas phase reactor to reduce fines entrainment into the gas cycle system and to reduce or remove solid particle build-up on one or more interior surfaces of the expanded section of the reactor.

Growing community of inventors

Scott Depot, WV, United States of America

Roger B Painter