Toluene free silica supported single-site metallocene catalysts from in-situ supported alumoxane formation in aliphatic solvents
AssigneeExxonMobil Chemical Patents Inc.
InventorsCharles J. Harlan, Steven C. Haas, Lubin Luo, Francis C. Rix, Xuan Ye
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Abstract
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.
Claims25
A method for preparing supported alumoxane having no detectable amount of aromatic solvent comprising:
- 1) contacting at least one support material, at least one hydrocarbyl aluminum compound and at least one non-hydrolytic oxygen-containing compound in an aliphatic solvent at a temperature of less than 0 to −60° C., 2) thereafter separating excess of the aliphatic solvent, and forming a alumoxane precursor, and 3) heating the combination of the at least one support material and the alumoxane precursor to a temperature of about 60 to about 200° C. and forming the supported alumoxane with no detectable amount of aromatic solvent.
A method for preparing supported alumoxane having no detectable amount of aromatic solvent comprising:
- 1) contacting at least one hydrocarbyl aluminum compound and at least one non-hydrolytic oxygen-containing compound in an aliphatic solvent at a temperature of less than 0 to −60° C., 2) thereafter contacting with a support material at a temperature of from −80 to 200° C., and forming an alumoxane precursor, 3) separating the aliphatic solvent, and 4) heating the combination of the support material and the alumoxane precursor to a temperature of about 60 to about 200° C. and forming the supported alumoxane with no detectable amount of aromatic solvent.
Dependencies are inferred from the claim text.