Northwestern University

Union Carbide Chemicals & Plastics Technology Corporation

Univation Technologies, LLC

Akzo Nobel N.v.

Other

Xinmin Yang

Tobin Jay Marks

Frederick John Karol

Li Jia

Walter Thomas Reichle

Natarajan Anand Muruganandam

Stanley B Mirviss

Michael D Awe

Li Ja

Purna Chand Sishta

Afif M Seyam

A process for the production of an ionic transition metal catalyst in supported form than is highly productive under gas phase olefin polymerization conditions. In the process a an aluminum alkyl is added to a suitable solvent after which a neutral metallocene compound is added to the solution under stirring in a quantity that provides for a ratio of Al to transition metal of at least 25:1. To this metallocene-aluminum alkyl solution is next added an ionic compound the anionic portion of which is a non-coordinating anion under stirring until all materials are dissolve. The ionic compound is added in a quantity that provides for a ratio of NCA to transition metal of at least 1:1. Next the support particles are added to the solution and thereafter the solution is heated to at least 40&deg; C. and held at this elevated temperature for at least 0.5 hour. Thereafter the solvent is removed and the supported catalyst is dried under vacuum.

Method for producing highly productive supported ionic catalyst for gas phase polymerization

The invention provides a process for reducing the low molecular weight oligomer content of olefin polymers produced by metallocene catalysis wherein at least one organometallic compound is fed continuously into the reactor during polymerization. The organometallic compound has the formula R A, wherein A is a Periodic Table Group 12 or 13 element. R is the same or different, substituted or unsubstituted, straight or branched chain alkylradical, cyclic hydrocarbyl radical, alkyl-cyclohydrocarbyl radical, aromatic radical or alkoxide radical and n is 2 or 3, to form a polymer product having a content of said compound of at least about 50 weight ppm.

Polymerization process

A catalyst composition is provided, which is prepared by contacting a cycloalkadienyl compound, a transition metal amide of the formula M(NMe,),X,, an aluminoxane, and optionally a solid support at a temperature of 0 to 100&deg; C.

Catalyst composition for the polymerization of olefins

Process for the preparation of polyethylene or polypropylene

A process for the polymerization of an olefin which employs as the catalyst composition the reaction product of a) a monocycloalkadienyl catalyst precursor; b) an activity enhancing cycloalkadiene; and c) an activating cocatalyst is disclosed.

Process for the production of olefin polymers

Aryloxyaluminoxanes containing the unit ##STR1## where R is unsubstituted or substituted aryl, such as phenyl or naphthyl, are useful as a cocatalysts in Ziegler-Natta and Kaminsky-type olefin polymerization catalysts. They can be formed by reaction of a source of water with an organoaluminum compound containing the desired aryloxy moiety or by reaction of preformed aluminoxane with an organic compound, such as a phenol, containing such a moiety.

Catalyst system comprising an aryloxyaluminoxane containing an electron

A catalyst composition comprising the reaction product of a) a monocycloalkadienyl catalyst precursor; b) an activity enhancing cycloalkadiene; and c) an activating cocatalyst is disclosed, which has high activity in the polymerization of olefins.

Catalyst composition for the production of olefin polymers

A new class of olefin dimerization catalysts and an efficient method for their preparation is disclosed. B (C.sub.6 F.sub.5).sub.3 reacts quantitatively with Group 4 metallocene type catalysts to yield highly reactive cationic complexes as follows:

Method for dimerizing an .alpha.-olefin

A polymer having a repeating unit of ##STR1## and a method for preparing it through Zr-catalyzed polymerization of methylenecyclopropane is disclosed.

Zirconium and hafnium-catalyzed polymerization of methylenecyclopropane

An ionic metallocene catalyst for olefin polymerization which comprises: (1) a cyclopentadienyl-type ligand, a Group IVB transition metal, and alkyl, aryl, or hydride substituents, as a cation, and (2) a weakly coordinating anion comprising boron substituted with halogenated, such as tetra fluoro, aryl substituents preferably containing silylalkyl substitution, such as para-silyl t-butyldimethyl.

Metallocene catalyst containing bulky organic group

A new class of olefin dimerization catalysts and an efficient method for their preparation is disclosed. B(C.sub.6 F.sub.5).sub.3 reacts quantitatively with Group 4 metallocene type catalysts to yield highly reactive cationic complexes as follows:

Homogeneous .alpha.-olefin dimerization catalysts

A non-coordinating anion, preferably containing a sterically shielded diboron hydride, if combined with a cyclopenta-dienyl-substituted metallocene cation component, such as a zirconocene metallocene, is a useful olefin polymerization catalyst component. The anion preferably has the formula ##STR1## where R is branched lower alkyl, such as t-butyl.

Sterically shielded diboron-containing metallocene olefin polymerization

The organolanthanide hydrides (Cp'.sub.2 LnH).sub.2 (Cp'=.eta..sup.5 -Me.sub.5 C.sub.5 ;Ln=Sm,Lu) rapidly catalyze the copolymerization of methylenecyclopropane and ethylene to cleanly yield high molecular weight polyolefins of microstructure {[CH.sub.2 CH.sub.2 ].sub.x [CH.sub.2 CH.sub.2 C(CH.sub.2)].sub.y }n via sequential olefin insertion and ring-opening/.beta.-alkyl shift processes. Homopolymerization of methylenecyclopropane likewise cleanly yields polymers of the structure [CH.sub.2 CH.sub.2 C(CH.sub.2)].sub.n.

Growing community of inventors

Evanston, IL, United States of America

Xinmin Yang