Back to results
US 5,625,087 AGranted
Silylium cationic polymerization activators for metallocene complexes
AssigneeThe Dow Chemical Company
InventorsDavid D. Devore, David R. Neithamer, Robert E. LaPointe, Robert D. Mussell
Life of this patent
Estimating the term…
Abstract
Catalyst systems useful in addition polymerization reactions comprising a Group 4 metal complex and a silylium salt activating cocatalyst are prepared by contacting the metal complex with a silylium salt of a compatible, non-coordinating anion, optionally the silylium salt is prepared by electrochemical oxidation and splitting of the corresponding disilane compound.
Claims3
A process for preparing a silylium salt corresponding to the formula:
- R.sub.3 Si(X').sub.q.sup.+ A.sup.-
- wherein
- R independently each occurrence is selected from the group consisting of hydrocarbyl, silyl, hydrocarbyloxy, dihydrocarbylamino, and combinations thereof having up to 20 nonhydrogen atoms, X' is a neutral Lewis base having up to 20 non-hydrogen atoms;
- q is zero or one;
- and
- A.sup.- is a noncoordinating, compatible anion, said process comprising oxidizing by electrolyzing a solution comprising a disilane compound corresponding to the formula:
- R.sub.3 SiSiR.sub.3
- wherein R is as previously defined, in the presence of a source of the noncoordinating counter ion, A.sup.- and optionally a neutral Lewis base.
5 more elements
Dependencies are inferred from the claim text.