US4542226A
Expired / Lapsed
US
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Method for making siloxanenorbornane bisanhydride
Assignee: General Electric Co
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Filing: 1984-07-16
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Granted: 1985-09-17
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Expires: 2004-07-16
Abstract
Abstract A method is provided for making siloxanenorbornane bisanhydride. Norbornane anhydride is initially hydrosilylated with dimethylchlorosilane in the presence of a platinum catalyst. The resulting dimethylchlorosilyl norbornane anhydride is thereafter hydrolyzed while in the molten state.
Inventors
- 👤 Victoria J. Eddy
- 👤 John E. Hallgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:19
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0838; C07F7/0872; C07F7/0874
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
71 words
A method for making silylnorbornane dianhydride of the formula ##STR2## which comprises (1) hydrosilylating 5-norbornene-2,3-carboxylic anhydride with dimethylchlorosilane in the presence of an effective amount of a platinum catalyst and an organic solvent; (2) vacuum distilling the mixture of (1) to recover 5-dimethylchlorosilyl-norbornane-2,3-dicarboxylic anhydride; (3) hydrolyzing the 5-dimethylchlorosilyl-norbornane 2,3-dicarboxylic anhydride at a temperature in the range of from about 100°-180° C. and (4) stripping the mixture of (3) under reduced pressure.
Claim 2
Independent Claim
71 words
A method for making silylnorbornane dianhydride of the formula ##STR2## which comprises (1) hydrosilylating 5-norbornene-2,3-carboxylic anhydride with dimethylchlorosilane in the presence of an effective amount of a platinum catalyst and an organic solvent; (2) vacuum distilling the mixture of (1) to recover 5-dimethylchlorosilyl-norbornane-2,3-dicarboxylic anhydride; (3) hydrolyzing the 5-dimethylchlorosilyl-norbornane 2,3-dicarboxylic anhydride at a temperature in the range of from about 100°-180° C. and (4) stripping the mixture of (3) under reduced pressure.
Claim 3
Dependent Claim
12 words
A method in accordance with claim 1, where the solvent is toluene.
Claim 4
Dependent Claim
19 words
A method in accordance with claim 1, where the platinum catalyst is a platinum complex of an unsaturated siloxane.
References Cited (Backward Citations)
US4381396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-16 | 1989-03-18 | 1989-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-16 | 1993-03-18 | 1993-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-16 | 1997-03-18 | 1997-09-17 | $7700.00 | Window Closed / Lapsed |