US5625087A
Expired / Lapsed
US
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Silylium cationic polymerization activators for metallocene complexes
Assignee: Dow Chemical Co
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Filing: 1994-09-12
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Granted: 1997-04-29
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Expires: 2014-09-12
Abstract
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.
Inventors
- 👤 David D. Devore
- 👤 David R. Neithamer
- 👤 Robert E. LaPointe
- 👤 Robert D. Mussell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:23
CPC Classifications
C; C07; C07F; C07F17/00; C07F5/00; C07F5/02; C07F5/027; C07F7/00; C07F7/02; C07F7/08; C07F7/0803; C07F7/0805; C08; C08F; C08F10/00; C25; C25B; C25B3/00; C25B3/01; C25B3/03; C25B3/20; C25B3/23; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65908; C08F4/6592
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
107 words
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 - 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 - and optionally a neutral Lewis base.
Claim 2
Dependent Claim
107 words
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 - 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 - and optionally a neutral Lewis base.
Claim 3
Dependent Claim
26 words
A process according to claim 1 wherein the oxidation is an electrolysis conducted at a potential of at least +0.5 volts versus a saturated calomel electrode.
Claim 4
Dependent Claim
24 words
A process according to claim 2 wherein the electrolysis is conducted until conversion of disilane compound is from 50 to 80 percent of theoretical.
References Cited (Backward Citations)
US5384299A
Cited
EP0416815A2
Cited
US5064802A
Cited
US5369196A
Cited
US5272236A
Cited
US5461128A
Cited
WO1993023412A1
Cited
US5470993A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-04-28 | 2000-10-28 | 2001-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-04-28 | 2004-10-28 | 2005-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-04-28 | 2008-10-28 | 2009-04-29 | $7700.00 | Window Closed / Lapsed |