Exxonmobil Chemical Patents Inc.

Albemarle Corporation

Northwestern University

W.r. Grace & Co. -conn.

Albermarle Corporation

Lubin Luo

Steven P Diefenbach

Gregory S Day

Matthew William Holtcamp

Jian Yang

Xuan Ye

Anupriya Jain

Tobin Jay Marks

Samuel A Sangokoya

Sung Cheol Yoon

Xiao Wu

Sudhin Datta

Patrick Brant

Christopher Garland Bauch

Jamie R Strickler

Charles J Harlan

Jeanette M Diop

Zhike Wang

Jo Ann M Canich

Francis Charles Rix

Matthew S Bedoya

Steven D Brown

Brian Kneale

Yen-Hao Lin

John Robert Hagadorn

Edward John Blok

Laughlin G McCullough

Chi-I Kuo

Catherine Anne Faler

Richard B Pannell

Matthew G Thorn

David F Sanders

Jeffrey Lawrence Brinen

Alan Anthony Galuska

George James Pehlert

Rohan A Hule

William Anthony Lamberti

Alex E Carpenter

Carlos R Lopez-Barron

Xin Chen

Todd S Edwards

Xiongdong Lian

Tzu-Pin Lin

Gursu Culcu

Irene C Cai

Steven C Haas

Medrado M Leal

Sergey Yakovlev

Alexander V Zabula

Katherine Wu

Rebecca C Savage

Rachel G Terry

Robert L Halbach

Xiaodan Zhang

Sung A Kim

Min Li

Matthew Grant Thorn

Provided herein are methods of polymerizing α-olefin monomer with a catalyst and hydrogen in a slurry to produce low molecular weight polyolefins. Hydrogen is vented from the low molecular weight polyolefins and then the low molecular weight polyolefins are further polymerized in a gas phase to produce a polyolefin having a molecular weight distribution of between 4.0 and 30 and a flexural modulus between 1500 mPa and 2500 mPa.

Processes for producing polyolefins and impact copolymers with broad molecular weight distribution and high stiffness

A supported catalyst system is based on a transition metal carbene including the moiety M1=CR*), wherein Mis the transition metal and R* is hydrogen or a C-Chydrocarbyl. The catalyst system can be supported on a metal oxide support such as silica or the catalyst can be self-supporting. Methods of making the catalyst system can involve precursors based on and/or reacted with aluminum alkyls, halides, and/or alkoxides. Methods of polymerizing cyclic olefins with the catalyst system can obtain polyalkenamers, cyclic olefin polymers, cyclic olefin copolymers, and other metathesis reaction products. The supported catalyst and/or monomer can be recovered and recycled to the polymerization reactor.

Metathesis catalyst system for polymerizing cycloolefins

Methods for the production of heterophasic polymers in gas and slurry phase polymerization processes, and polymer compositions made therefrom, are disclosed herein.

Production of heterophasic polymers in gas or slurry phase

The present disclosure provides a method for preparing a catalyst system comprising contacting in an aliphatic solvent at a temperature of from less than 0&#xb0; C. to &#x2212;60&#xb0; C. at least one support material having absorbed water and at least one hydrocarbyl aluminum compound to form a supported alumoxane (catalyst precursor) and contacting the supported alumoxane with at least one catalyst compound having a Group 3 through Group 12 metal atom or lanthanide metal atom. The supported alumoxane may be heated prior to contact with the catalyst compound.

Toluene free silica supported single-site metallocene catalysts from in-situ supported MAO formation in aliphatic solvents

The present disclosure relates to amido-benzoquinone transition metal complexes, catalyst systems including amido-benzoquinone transition metal complexes, and polymerization processes to produce polyolefin polymers such as polyethylene-based polymers and polypropylene-based polymers.

Amido-benzoquinone catalyst systems and processes thereof

Heterophasic copolymers of propylene and an alpha olefin comonomer having a matrix phase and a fill phase, particularly, a heterophasic copolymer having a high fill phase content (greater than or equal to 50%), are provided herein. Polymerization methods and catalyst systems for producing such heterophasic copolymers are also provided.

Heterophasic copolymers and polymerization methods

The present disclosure provides methods for preparing a catalyst system comprising contacting in an aliphatic solvent at least one support material, at least one hydrocarbyl aluminum compound and at least one non-hydrolytic active oxygen-containing compound to form a supported alumoxane (catalyst system precursor) and contacting the supported alumoxane with at least one catalyst compound having a Group 3 through Group 12 metal atom or lanthanide metal atom. The supported alumoxane may be heated prior to contact with the catalyst compound.

Toluene free silica supported single-site metallocene catalysts from in-situ supported alumoxane formation in aliphatic solvents

Catalyst systems including a catalyst compound having a Group 3 through Group 12 metal atom or lanthanide metal atom, an activator, and a support material composition, are provided. The support material composition may have a volume percent of pores with a pore size of from 300 angstroms to 1500 angstroms of 10 vol % to 80 vol %. Processes for producing a polyolefin composition utilizing such catalyst systems are also provided.

Catalyst systems and polymerization processes for using the same

Disclosed are methods for the production of polymers, including random copolymers (RCPs), in single reactor gas or slurry phase polymerization processes, and polymer compositions produced therefrom. The methods enable polymers having low melting temperatures to be made in gas and slurry phase polymerization processes, where they conventionally could not be made in these processes due to stickiness and fouling problems in the reactor.

Single reactor production of polymers in gas or slurry phase

This invention relates to supported metallocene catalyst systems for polymerization, the catalyst systems comprising asymmetrically substituted indenyl groups, high surface area supports, and aluminoxane activators. This invention also relates to methods for polymerizing olefins, including methods for producing isotactic polypropylene.

Supported metallocene catalyst systems for polymerization

This invention relates to a catalyst system comprising fluorided silica, alkylalumoxane activator and at least two metallocene catalyst compounds, where the first metallocene is a bridged monocyclopentadienyl group 4 transition metal compound and the second metallocene is a biscyclopentadientyl group 4 transition metal compound, where the fluorided support has not been calcined at a temperature of 400&#xb0; C. or more, and is preferably produced using a west mixing method, such as an aqueous method.

Catalyst composition comprising fluorided support and processes for use thereof

The invention is directed to a supported olefin polymerization catalyst system comprising catalyst compound, silica support and alumoxane activator, where part of the alumoxane is present on the support and part of the alumoxane is not associated with the support, wherein the silica comprises silica particles having an average surface area of greater than about 400 m/g, an average pore diameter of less than about 70 Angstroms, and wherein alumoxane is present on the support in an amount of less than 7 mmol Al/g silica and at least 1 wt % of alumoxane particles not associated with the support are present in the catalyst system, based upon the weight of the catalyst system.

Catalyst system comprising supported alumoxane and unsupported alumoxane particles

Olefin polymerization catalyst systems having high aluminoxane loading and methods for making and using them are disclosed herein.

Silica supports with high aluminoxane loading capability

This invention relates to high porosity (&#x2265;15%) and/or low pore diameter (PD&#x3c;165 &#x3bc;m) propylene polymers and propylene polymerization processes using single site catalyst systems with supports having high surface area (SA&#x2265;400 m/g), low pore volume (PV&#x2264;2 mL/g), a specific mean pore diameter range (PD=1-20 nm), and high average particle size (PS&#x2265;30 &#x3bc;m).

Bimodal propylene polymers and sequential polymerization

Growing community of inventors

Houston, TX, United States of America

Lubin Luo