Homogeneous catalysts and olefin polymerization process
AssigneeThe Dow Chemical Company
InventorsJohn G. Hefner, Brian W. S. Kolthammer
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Abstract
Olefins are polymerized in the presence of a homogeneous catalyst represented by the formula LTi(NR.sub.2).sub.3 wherein L is a .sub.II -bonded ligand selected from the group consisting of indenyl, C.sub.1 -C.sub.4 alkyl substituted indenyl, --OSiR.sub.3 substituted indenyl, R is a C.sub.1 -C.sub.4 alkyl group wherein each R attached to the same nitrogen atom is the same, but the R groups attached to different nitrogen atoms can be the same or different from those attached to the other nitrogen atoms.
Claims5
A process for preparing catalytic compounds represented by the formula LTi(NR.sup.1.sub.2).sub.3 wherein L is a pi-bonded ligand selected from the group consisting of indenyl, C.sub.1 -C.sub.4 alkyl substituted indenyl, --OSiR.sub.3 substituted indenyl, and each R.sub.1 is the same and is a C.sub.1 -C.sub.4 alkyl group which process comprises (1) reacting in a solvent or reaction medium selected from the class of aliphatic or aromatic hydrocarbons a compound represented by the formula Ti(NR.sup.1.sub.2).sub.4 wherein each R.sub.1 is the same and is a C.sub.1 -C.sub.4 alkyl group;
- with a compound represented by the formula R'(Ind) wherein R' is hydrogen, a C.sub.1 -C.sub.4 alkyl group, --OSiR.sub.3, --OR or a halogen;
- R is a C.sub.1 -C.sub.4 alkyl group;
- and IND is an indenyl group;
- and (2) recovering the desired product from the reaction mixture.
Dependencies are inferred from the claim text.