Engineered catalyst systems and methods for their production and use
AssigneeExxon Chemical Patents Inc.
InventorsAnthony N. Speca, Jeffrey L. Brinen, James J. McAlpin
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Abstract
This invention relates to supported metallocene catalyst systems and to methods for their production and use. Specifically, this invention relates to supported catalyst systems having unique, predetermined properties resulting from the designed distribution of catalyst components within and upon porous support particles. The designed distribution of catalyst components is obtained through sequential deposition of catalyst components with intervening removal of solvent.
Claims25
A method for preparing a supported metallocene catalyst, said method comprising the steps of:
- (a) combining support material and a first solution comprising a first metallocene thereby forming a mixture;
- then
- (b) removing the solvent from the mixture thereby forming a supported first metallocene;
- then
- (c) combining the supported first metallocene with a second solution comprising a second metallocene wherein the second metallocene is different from the first thereby forming a resultant mixture;
- then
- (d) removing the solvent from said resulting mixture.
A method for preparing a supported metallocene catalyst, said method comprising the steps of:
- (a) combining porous support material and a first solution comprising solvent and a first metallocene wherein the volume of said first solution is less than about three times the total pore volume of the porous support thereby forming a mixture;
- then
- (b) removing the solvent from the mixture thereby forming a supported first metallocene;
- then
- (c) combining the supported first metallocene with a second solution comprising solvent and a second metallocene wherein the second metallocene is different from the first and wherein the volume of solution is less than about three times the total pore volume of the supported first metallocene forming a resulting mixture;
- then
- (d) removing the solvent from said resulting mixture.
A method for preparing a supported metallocene catalyst, said method comprising the steps of;
- (a) combining porous support material having active surface hydroxyl groups and a first solution consisting essentially of solvent and a first metallocene wherein the volume of said first solution is less than about 2.5 times the total pore volume of the porous support thereby forming a mixture;
- then
- (b) removing the solvent from the mixture thereby forming a supported first metallocene;
- then
- (c) combining the supported first metallocene with a second solution comprising solvent, a second metallocene, and an alumoxane wherein the second metallocene is different from the first and wherein the volume of solution is less than about 2.5 times the total pore volume of the supported first metallocene thereby forming a resulting mixture;
- then
- (d) removing the solvent from said resulting mixture.
Dependencies are inferred from the claim text.