Toluene free silica supported single-site metallocene catalysts from in-situ supported MAO formation in aliphatic solvents
AssigneeExxonMobil Chemical Patents Inc.
InventorsLubin Luo, Anupriya Jain, Charles J. Harlan
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Abstract
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° C. to −60° 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.
Claims19
A method comprising:
- contacting in an aliphatic solvent at a temperature of from less than −10° C. to −60° C. a support material having absorbed water and at least one hydrocarbyl aluminum compound;
- wherein
- the support material contains absorbed water in a ratio of from 1:1.5 to 1:3 mol water:mol hydrocarbyl aluminum;
- and
- the supported alumoxane composition is further heat-treated at a temperature from 60° C. to 200° C. for 0.5 to 24 hours.
A continuous process for preparing supported alumoxane comprising contacting in an aliphatic solvent at a temperature of from less than −10° C. to −60° C. at least one support material comprising silica having absorbed water and at least one hydrocarbyl aluminum compound to produce a silica supported alumoxane, separating the silica supported alumoxane from the aliphatic solvent and recycling the aliphatic solvent and any excess hydrocarbyl aluminum;
- wherein
- the at least one support material contains absorbed water in a ratio of from 1:1.5 to 1:3 mol water:mol hydrocarbyl aluminum;
- and
- the supported alumoxane composition is further heat-treated at a temperature from 60° C. to 200° C. for 0.5 to 24 hours.
Dependencies are inferred from the claim text.