Metallocene catalyst systems
AssigneeExxon Chemical Patents Inc.
InventorMain Chang
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Abstract
This invention relates generally to metallocene catalyst systems and to methods for their production and use. Specifically, this invention relates to a method for preparing metallocene catalyst systems using olefin additives which promote catalyst activity.
Claims45
A method of forming a metallocene catalyst system comprising:
- combining at least one metallocene, at least one activator, and at least one promoter wherein the promoter comprises allylbenzene, vinyltrimethylsilane, vinyldiethylmethylsilane, phenylmethylvinylsilane or a compound represented by the formula:
- R1R2R3MCH═CH2
- wherein R1 is a C6-C10 aryl group which is optionally halogenated, or a C7-C40 alkylaryl group, R2 and R3 are identical or different and are selected from a C6-C10 aryl group which is optionally halogenated, a C7-C40 alkylaryl group or a C1-C10 alkyl group which is optionally halogenated;
- M is carbon, silicon, germanium or tin,
- wherein the molar ratio of metallocene to promoter is in the range of from about 1:1 to about 1:1000.
A method for forming a supported metallocene catalyst system comprising:
- (a) combining at least one metallocene and at least one activator to form an activated metallocene;
- (b) mixing the activated metallocene with support material;
- and
- (c) adding promoter wherein the promoter comprises a compound represented by the formula Ph—SiR1R2—CH═CH2 wherein R1 and R2 are independently an alkyl group, an arylalkyl group, or an alkylaryl group in an amount such that the molar ratio of metallocene to promoter is in the range of from about 1:1 to about 1:1000.
A metallocene catalyst system comprising the reaction product of a mixture comprising a metallocene, an activator, and a promoter wherein the promoter comprises allylbenzene, vinyltrimethylsilane, vinyldiethylmethylsilane, phenylmethylvinylsilane or a compound represented by the formula
- Ph—SiR1R2—CH═CH2
- wherein R1 and R2 are independently an alkyl group, an arylalkyl group, or an alkylaryl group;
- wherein the molar ratio of metallocene to promoter in the mixture is in the range from about 1:1 to about 1:1000.
A metallocene catalyst system comprising the reaction product of a mixture comprising a metallocene, an activator, and a promoter wherein the promoter comprises styrene, a substituted styrene, allylbenzene, vinyltrimethylsilane, vinyldiethylmethylsilane, phenylmethylvinylsilane or a compound represented by the formula Ph—SiR1R2—CH═CH2 wherein R1 and R2 are independently an alkyl group, an arylalkyl group, or an alkylaryl group;
- wherein the molar ratio of metallocene to promoter in the mixture is in the range from about 1:1 to about 1:1000;
- the catalyst system further comprising a 1-olefin copromoter, the mole ratio of the metallocene to the copromoter being in the range of from about 1:1 to about 1:1000.
Dependencies are inferred from the claim text.