Catalysts for control of long chain branching
Catalyst systems and methods for making and using the same are disclosed. A catalyst composition is provided that includes a catalyst compound supported to form a supported catalyst system, the catalyst compound including: where each of R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and X are as discussed herein.
1. A catalyst composition comprising a catalyst compound supported to form a supported catalyst system, wherein the catalyst compound comprises:
wherein Each X is independently a leaving group selected from a halogen, a labile hydrocarbyl, a substituted hydrocarbyl, or a heteroatom group.
2. The catalyst composition of claim 1 , comprising an activator comprising an acid derived from a coordinating anion.
3. The catalyst composition of claim 1 , comprising an activator of an aluminoxane compound, an organoboron compound, an organoaluminum compound or combinations thereof.
4. The catalyst composition of claim 3 , wherein the activator comprises methyl aluminoxane or modified methylauminoxane.
5. The catalyst composition of claim 1 , comprising a support comprising a mineral, a clay, a metal oxide, a metalloid oxide, a mixed metal oxide, a mixed metalloid oxide, a mixed metal-metalloid oxide, a polymer, or any combinations thereof.
6. The catalyst composition of claim 5 , wherein the support is a polyolefin.
7. The catalyst composition of claim 5 , wherein the support has been thermally treated and/or chemically treated with an acid, an organoaluminum compound, or a fluoriding agent, or any combinations thereof.
8. The catalyst composition of claim 5 , wherein the support has been thermally treated.
9. The catalyst composition of claim 5 , wherein the support comprises silica, alumina, aluminosilicate, titanated silica, or titanated alumina, or any combinations thereof.
10. The catalyst composition of claim 1 , comprising a silica support and a methyl aluminoxane activator.