Exxonmobil Chemical Patents Inc.

Anupriya Jain

Lubin Luo

Xuan Ye

Yen-Hao Lin

Edward John Blok

Matthew S Bedoya

Alan Anthony Galuska

Charles J Harlan

Xin Chen

Sergey Yakovlev

Medrado M Leal

Alexander V Zabula

Rebecca C Savage

Rachel G Terry

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

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

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

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

Olefin polymerization catalyst systems and methods for making and using the same are provided.

Catalyst systems and methods of making and using the same

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Pearland, TX, United States of America

Anupriya Jain