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US 10,723,816 B2Granted
Multi- or dual-headed compositions useful for chain shuttling and process to prepare the same
AssigneeDow Global Technologies LLC
InventorsLixin Sun, David D. Devore
Life of this patent
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Abstract
The present disclosure relates to a process for synthesizing multi- or dual-headed compositions having the formula R1MA[R2MA-]NR1 by employing a sterically hindered compound and an organometallic compound in the presence of a transition metal catalyst. The present disclosure further relates to use of the compositions, as well as the process to make the same, in olefin polymerization.
Claims5
A process for preparing a composition comprising the steps of:
- contacting a sterically hindered diene with an organometallic compound, a solvent, a catalyst precursor, and a co-catalyst to form a solution containing the composition, wherein the composition has the formula:
- R1MA[R2MA-]NR1, or an aggregate thereof, a Lewis base-containing derivative thereof, or any combination thereof;
- wherein:
- MA in each occurrence is Zn, Mg, Ga, B, or Al;
- R1 in each occurrence is independently selected from hydrogen, alkyl, halide, amide, hydrocarbyl, hydrocarbylamide, dihydrocarbylamide, hydrocarbyloxide, hydrocarbylsulfide, dihydrocarbylphosphido, tri(hydrocarbyl)silyl;
- any hydrocarbyl group being optionally substituted with at least one halide, amide, hydrocarbylamide, dihydrocarbylamide, or hydrocarbyloxide;
- and each carbon-containing R1 having from 1 to 50 carbon atoms, inclusive;
- R2 in each occurrence is a derivative of the sterically hindered diene;
- and
- N, on average, in each occurrence is a number from 1-150, inclusive.
7 more elements
Dependencies are inferred from the claim text.