Union Carbide Chemicals & Plastics Technology Corporation

Univation Technologies, LLC

Clark Curtis Williams

Mark Gregory Goode

Simon Mawson

David James Schreck

Rex Eugene Murray

John Francis Szul

Timothy Todd Wenzel

Timothy R Lynn

Arakalgud V Ramamurthy

Gregory T Whiteker

Thomas Henry Peterson

John Henry Oskam

Matthew Gary McKee

Kersten Anne Erickson

Robert Converse Brady, Iii

Paul T Daniell

Purna Chand Sishta

Jody Michael Moffett

James D Schreck

D James Schreck

Kiu H Lee

Fathi David Hussein

George Ernest Keller, Ii

Thomas James McNeil

Mark Wilton Smale

Eldon Ronald Larsen

Jean Bowman Cropley

Arakalud Venkatapathia Ramamurthy

Keith Ernest Carmichael

This invention relates to methods to introduce multiple catalysts, activators or catalyst systems into a gas phase reactor.

Solution feed of multiple catalysts

The present invention teaches the use of particular soluble metallocene catalyst to produce stereo-regular polymers in gas phase polymerizations wherein the catalysts are fed into a particle lean zone in the react. The metallocenes catalysts are bridged bis-(substituted indenyl) compounds.

Manufacture of stereoregular polymers

Olefin polymerization catalyst

The present invention relates to a method to polymerize monomer comprising contacting one or more monomer(s) with a catalyst system in a gas phase reactor having a recycle system, for removing a recycle gas and unreacted monomer(s) from the reactor and returning the recycle gas and fresh monomer(s) to the reactor, and a plenum, the method comprising the steps of: (a) cooling the recycle gas to form a cooled recycle gas; (b) optionally combining the cooled recycle gas with additional recycle gas; and (c) injecting the cooled recycle gas into the gas phase reactor through the plenum.

Polymerization process

A process, carried out in the gas phase, comprising contacting one or more olefins with a catalyst system containing a carrier gas and a mixture of solids comprising a transition metal compound or complex and a liquid organic solvent, under polymerization conditions, in a fluidized bed reactor containing resin particles in a fluidized state with the provisos that (a) the mixture of solids and solvent contains at least about 95 percent by weight solids and (b) the mixture is sprayed with the carrier gas into a particle-lean zone, or the fluidized bed, of the reactor.

Control of solution catalyst droplets

Liquid catalyst composition is fed to a fluidized bed olefin polymerization reactor through an ultrasonic nozzle, enabling improved control over average catalyst composition droplet size and size distribution, which provides better control over resin particle size. The spray may be surrounded by a shroud of gas which creates a particle lean zone, thus reducing the likelihood of contact by the catalyst composition with existing product particles already suspended in the fluid bed.

Ultrasonic catalyst feed for fluid bed olefin polymerization

This invention relates to a process to polymerize olefins comprising contacting an olefin with a composition comprising the product of the combination of an activator and a transition metal compound provided that if the process occurs in the slurry phase then the activator and the transition metal compound are allowed to react for at least fifteen minutes before being contacted with the olefin.

Polyolefin

The present invention teaches the use of particular soluble metallocene catalysts to produce stereoregular polymers in gas phase polymerizations wherein the catalysts are fed into a particular lean zone in the reactor. The metallocene catalysts are bridged bis(substituted indenyl) compounds.

The invention relates to a process for the polymerization of olifins in the presence of an activated catalyst composition comprising a single site catalyst precursor and an activating cocatalyst, which comprises contacting outside of a polymerization reactor a single site catalyst precursor with an activating cocatalyst before, during, or after contacting the single site catalyst precursor with a weakly coordinating electron donor that does not substantially polymerize during either contacting.

Olefin polymerization catalyst composition having increased activity

Addition of water to a gas phase olefin polymerization reactor in amounts greater than 3 ppmv permits an increase in the level of condensable gas and facilitates operation of the reactor at an elevated dew point by ameliorating electrostatic phenomena in the reactor; the process inhibits sheeting.

Static control in olefin polymerization

The use of perpendicular spray nozzles to deliver liquid catalyst to a gas-phase polymerization reactor is taught. Moreover, a method of reducing the amount of gas needed to deliver catalyst is also taught.

Control of solution catalyst droplet size with a perpendicular spray

Growing community of inventors

Charleston, WV, United States of America

Clark Curtis Williams