Abstract: This description addresses a process for the preparation of polyolefins from one or more olefinic monomers comprising combining said olefins under olefin polymerization conditions with an organometallic catalyst compound that is activated for olefin polymerization by reaction with a Group 13 element cocatalyst complex comprising at least one halogenated, nitrogen-containing aromatic group ligand. High number-average molecular weight polymers and copolymers at high rates of productivity were observed from the use of metallocene catalysts complexes when activated with [(C6H5)3C][(C6F5)3B(C5F4N)].
Abstract: The present invention relates to a mixed catalyst system of at least one bridged, bulky ligand metallocene-type compound, and at least one bridged, asymmetrically substituted, bulky ligand metallocene-type compound, a method of making the mixed catalyst system and to its use in a polymerization process to produce olefin polymers having an unexpected improvement in processability.
Abstract: A catalyst composition for the polymerization of olefins is provided. The catalyst composition comprises a mono- or biscycloalkadienyl catalyst precursor comprising at least one protected hydride ligand or protected hydrocarbyl ligand bound to a metal atom plus a cocatalyst. The protected hydride ligand is preferably a borohydride ligand.
Abstract: The present invention relates to a catalyst composition and a method for making the catalyst composition of a polymerization catalyst and a carbonyl compound. The invention is also directed to the use of the catalyst composition in the polymerization of olefin(s). In particular, the polymerization catalyst system is supported on a carrier. More particularly, the polymerization catalyst comprises a bulky ligand metallocene-type catalyst system.
Abstract: Ethylene polymers having a) a Polydispersity Index of about 2 to about 4; b) a melt index, MI, and Relaxation Spectrum Index, RSI, such that (RSI)(MI.sup.0.6) is about 2.5 to about 6.5; c) a Crystallizable Chain Length Distribution Index, L.sub.w /L.sub.n, of about 1.0 to about 9; and d) a density, .rho., and a percent haze when fabricated into films such that the percent haze is less than 370.rho.-330, are provided. These ethylene polymers advantageously combine superior clarity and toughness with low extractables and enhanced processing ease.
Type:
Grant
Filed:
April 2, 1998
Date of Patent:
December 12, 2000
Assignee:
Univation Technologies, LLC
Inventors:
George Norris Foster, Tong Chen, Robert Harold Vogel, Scott Hanley Wasserman, Day-Chyuan Lee, Walter Thomas Reichle, Frederick John Karol, Gregory Todd Whiteker
Abstract: This invention is directed to a process for the preparation of polyolefins from one or more olefinic monomers comprising combining said olefins under olefin polymerization conditions with an organometallic catalyst compound that is activated for olefin polymerization by reaction with at least one Lewis acid aluminum compound of the formula R.sub.n Al(ArHal).sub.3-n, where "ArHal" is a halogenated aryl group, n=1 or 2, and R is a monoanionic group other than a halogenated aryl group. The invention also relates to a polymer produced using the process and to the polymer itself.
Abstract: This description addresses a process for the preparation of polyolefins from one or more olefinic monomers comprising combining said olefins under olefin polymerization conditions with an organometallic catalyst compound that is activated for olefin polymerization by reaction with a Group 13 element cocatalyst complex comprising at least one halogenated, nitrogen-containing aromatic group ligand. High number-average molecular weight polymers and copolymers at high rates of productivity were observed from the use of metallocene catalysts complexes when activated with [(C.sub.6 H.sub.5).sub.3 C][(C.sub.6 F.sub.5).sub.3 B(C.sub.5 F.sub.4 N)].
Abstract: A catalyst composition for the polymerization of olefins is provided, comprising a bis(hydroxy aromatic nitrogen ligand) transition metal catalyst precursor and an activating cocatalyst.
Type:
Grant
Filed:
February 25, 1998
Date of Patent:
July 25, 2000
Assignee:
Univation Technologies, LLC
Inventors:
Walter Thomas Reichle, Frederick John Karol
Abstract: A carbocationic catalyst composition comprising an initiator of water, a tertiary alkyl or aralkyl halide, ester, ether, carboxylic acid, acid halide or a polymeric halide, a co-initiator of organometal alkoxide halides, organometal phenoxide halides and/or organometal carboxyl halides is used to produce polymers particularly polyisobutylene and isobutylene/para-methyl-styrene copolymers.
Abstract: 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.
Type:
Grant
Filed:
November 25, 1997
Date of Patent:
May 23, 2000
Assignee:
Univation Technologies LLC.
Inventors:
Walter Thomas Reichle, Xinmin Yang, Frederick John Karol
Abstract: This invention relates to a process for polymerizing ethylene comprising contacting ethylene and optional comonomers with a catalyst system comprising an activator and a transition metal compound represented by the formula: ##STR1## Wherein R.sub.1 and R2 are independently hydrogen or a group having up to 100 carbon atoms, Cp.sub.1 is a bulky ligand; Cp.sub.2 is a bulky ligand or a heteroatom optionally bound to a C.sub.1 to C.sub.50 hydrocarbyl group, n is the valence state of the transition metal, Tm is a Group 3 to 10 metal, and each X is independently an anionic leaving group.
Type:
Grant
Filed:
December 30, 1998
Date of Patent:
March 7, 2000
Assignee:
Univation Technologies, LLC
Inventors:
Donna J. Crowther, Natalie A. Merrill, Ching-Tai Lue
Abstract: This invention relates to a method to produce pentfulvenes comprising combining a partially substituted cyclopentadiene with a carbonyl containing compound and lithium or an alkyl lithium, wherein the partially substituted cyclopentadiene is represented by the formula: ##STR1## wherein the R.sup.1 to R.sup.5 groups are independently hydrogen or a C.sub.1 to C.sub.100 group, provided at least one R group is hydrogen but not more than three R groups are hydrogen.
Abstract: The invention is generally directed toward a catalyst system useful for polymerizing olefins. The catalyst system of this invention comprises a supported ion-exchange catalyst system.
Type:
Grant
Filed:
June 7, 1995
Date of Patent:
September 1, 1998
Assignee:
Exxon Chemical Patents, Inc.
Inventors:
Moses Olukayode Jejelowo, Gregory George Hlatky
Abstract: The present invention relates to a continuous process for the polymerization of olefin(s) utilizing a metallocene catalyst or catalyst system in a continuous slurry or gas phase polymerization process for polymerizing monomer(s). The invention is more particularly drawn to a gas phase polymerization process for polymerizing one or more olefin(s), alone or in combination, in the presence of a metallocene catalyst system in a fluidized bed reactor, preferably operating in a condensed mode.
Type:
Grant
Filed:
September 14, 1994
Date of Patent:
June 9, 1998
Assignee:
Exxon Chemical Patents Inc.
Inventors:
Michael Elroy Muhle, Gary Thomas Renola, Agapios Kyriacos Agapiou, Dwayne Lee Litteer, John Robert Griffin
Abstract: This invention relates to a process for transitioning between incompatible polymerization catalyst systems. Particularly, the invention relates to a process for transitioning from an olefin polymerization reaction utilizing a traditional Ziegler-Natta catalyst system to a metallocene-olefin polymerization reaction.
Type:
Grant
Filed:
May 17, 1995
Date of Patent:
May 19, 1998
Assignee:
Exxon Chemical Patents Inc.
Inventors:
Agapios Kyriacos Agapiou, Michael Elroy Muhle, Gary Thomas Renola
Abstract: This invention relates to a process for transitioning between incompatible polymerization catalyst systems. Particularly, the invention relates to a process for transitioning from an olefin polymerization reaction utilizing a traditional Ziegler-Natta catalyst system to a metallocene-olefin polymerization reaction.
Type:
Grant
Filed:
May 19, 1995
Date of Patent:
May 5, 1998
Assignee:
Exxon Chemical Patents Inc.
Inventors:
Agapios Kyriacos Agapiou, Michael Elroy Muhle, Gary Thomas Renola
Abstract: The present invention relates to a continuous process for the polymerization of olefin(s) utilizing a metallocene catalyst or catalyst system in a continuous slurry or gas phase polymerization process. The invention is more particularly drawn to a gas phase polymerization process for polymerizing one or more olefin(s) in the presence of a metallocene catalyst system in a fluidized bed reactor in the absence of or with a low mount of a scavenger.
Type:
Grant
Filed:
October 30, 1995
Date of Patent:
January 27, 1998
Assignee:
Exxon Chemical Patents Inc.
Inventors:
Patrick Brant, John R. Griffin, Michael Elroy Muhle, Dwayne Lee Litteer, Agapios Kyriacos Agapiou, Gary Thomas Renola
Abstract: The present invention relates to a gas phase process for the polymerization of olefins utilizing a metallocene catalyst system to produce polymers having a low density and a relatively high molecular weight. More particularly, the gas phase process of the invention is directed forward the production of very low density polymers, for example rubbers, elastomers and plastomers.
Type:
Grant
Filed:
October 31, 1994
Date of Patent:
January 27, 1998
Assignee:
Exxon Chemical Patents Inc.
Inventors:
Eugene Edmond Poirot, Vispi Ruston Sagar, Scott Kevin Jackson
Abstract: This invention relates to a process for transitioning between polymerization catalyst systems which are incompatible with each other. Particularly, the invention relates to a process for transitioning from an olefin polymerization reaction utilizing a traditional Ziegler-Natta catalyst system to a metallocene-olefin polymerization reaction.
Type:
Grant
Filed:
June 5, 1995
Date of Patent:
September 30, 1997
Assignee:
Exxon Chemical Patents Inc.
Inventors:
Michael Elroy Muhle, Agapios Kyriacos Agapiou, Gary Thomas Renola
Abstract: This invention relates to a process for transitioning between incompatible polymerization catalyst systems. Particularly, the invention relates to a process for transitioning from an olefin polymerization reaction utilizing a traditional Ziegler-Natta catalyst system to a metallocene-olefin polymerization reaction.
Type:
Grant
Filed:
May 17, 1995
Date of Patent:
September 30, 1997
Assignee:
Exxon Chemical Patents, Inc.
Inventors:
Agapios Kyriacos Agapiou, Michael Elroy Muhle, Gary Thomas Renola