Transition metal catalyst, method of preparing catalyst, polymerization process employing catalyst, and polymer produced
AssigneePhillips Petroleum Company
InventorsHenry L. Hsieh, Ted M. Pettijohn
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Abstract
A polymerization catalyst system is provided comprising a catalyst and a cocatalyst, wherein the catalyst comprises a chromium compound and a transition metal compound, wherein said chromium compound is a cyclopentadienyl compound, wherein the transition metal compound is a titanium hydrocarbyloxide, and wherein said cocatalyst is an organoaluminum-halide compound. Other aspects of the invention provide a process for preparing the catalyst described above, a polymerization process employing the catalyst, and the polymer produced.
Claims22
A olefin polymerization catalyst system comprising a catalyst and a cocatalyst;
- wherein said catalyst comprises a chromium compound and a transition metal compound,
- wherein said chromium compound is represented by the formula ##STR2## wherein each Y is individually selected from the group consisting of hydrogen and alkyl radicals containing from 1 to 20 carbon atoms;
- wherein said transition metal compound is a titanium hydrocarbyloxide represented by the formula
- Ti(OR).sub.4
- wherein each R is individually selected from the group consisting of alkyl, cycloalkyl, aryl, alkaryl, and aralkyl hydrocarbyl radicals containing from 1 to 20 carbon atoms per radical;
- and
- wherein said cocatalyst is an organoaluminum halide containing at least one hydrocarbyl radical individually selected from the group consisting of alkyl, cycloalkyl, aryl, alkaryl, and aralkyl hydrocarbyl radicals containing from 1 to 20 carbon atoms per radical.
An olefin polymerization catalyst system comprising a catalyst and a cocatalyst,
- wherein said catalyst comprises a chromium compound and a transition metal compound,
- wherein said chromium compound is represented by the formula ##STR3## wherein each Y is individually selected from the group consisting of hydrogen and alkyl radicals containing from 1 to 6 carbon atoms;
- wherein said transition metal compound is a titanium tetraalkoxide wherein each alkoxide is individually selected and contains from 1 to 10 carbon atoms;
- and
- wherein said cocatalyst is a dialkylaluminum chloride wherein each alkyl radical is individually selected and contains from 1 to 10 carbon atoms per radical.
A catalyst system consisting essentially of a catalyst and a cocatalyst,
- wherein said catalyst is a mixture of a chromium compound and a transition metal compound,
- wherein said chromium compound is represented by the formula ##STR4## wherein each Y is individually selected from the group consisting of hydrogen and alkyl radicals containing from 1 to 6 carbon atoms;
- wherein said transition metal compound is a titanium tetraalkoxide wherein each alkoxide is individually selected and contains from 1 to 10 carbon atoms;
- and
- wherein said cocatalyst is a dialkylaluminum chloride wherein each said alkyl radical is individually selected and contains from 1 to 10 carbon atoms per radical.
A process for preparing a polymerization catalyst system comprising:
- (1) contacting a chromium compound and a transition metal compound to form a catalyst, and
- (2) contacting said catalyst and a cocatalyst to form said catalyst system;
- wherein said chromium compound is represented by the formula ##STR5## wherein each Y is individually selected from the group consisting of hydrogen and alkyl radicals containing from 1 to 20 carbon atoms;
- wherein said transition metal compound is a titanium hydrocarbyloxide represented by the formula
- Ti(OR).sub.4
- wherein each R is individually selected from the group consisting of alkyl, cycloalkyl, aryl, alkaryl, and aralkyl hydrocarbyl radical containing from 1 to 20 carbon atoms per radical;
- and
- wherein said cocatalyst is an organoaluminum halide containing at least one hydrocarbyl radical individually selected from the group consisting of alkyl, cycloalkyl, aryl, alkaryl, and aralkyl hydrocarbyl radicals containing from 1 to 20 carbon atoms per radical.
Dependencies are inferred from the claim text.