Exxonmobil Chemical Patents Inc.

Steven C Haas

Charles J Harlan

Matthew William Holtcamp

Francis Charles Rix

Lubin Luo

Xuan Ye

Subramaniam Kuppuswamy

A process to synthesize a Group 4 ansa-metallocene. The process includes reacting an alkaline earth metal dianion dicyclopentadiene ligand-Lewis base complex with a Group 4 metal tetrahalide in the presence of an alkali metal halide, and forming the Group 4 ansa-metallocene dihalide with high yield and purity.

Metallocene synthesis process

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

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Manvel, TX, United States of America

Steven C Haas