US4185029A
Expired / Lapsed
US
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Method of preparing orthosilicic acid alkyl esters
Assignee: Dynamit Nobel AG
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Filing: 1978-01-05
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Granted: 1980-01-22
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Expires: 1998-01-05
Abstract
Abstract A process for preparing an orthosilicic acid tetraalkyl ester having 2 to 6 carbon atoms in the ester group which comprises contacting metallic silicon with an alcohol corresponding to the ester group in the presence of the corresponding alkali alcoholate: A. in the presence of a surface active substance; B. in the presence of a compound containing a methoxy group; or C. under pressure at a temperature above the boiling point of the reaction mixture.
Inventors
- 👤 Gerhard Kreuzburg
- 👤 Arnold Lenz
- 👤 Walter Rogler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:49
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
73 words
A process for preparing an orthosilicic acid tetraaalkyl ester having 2 to 6 C atoms in the ester group which comprises contacting metallic silicon with an alcohol corresponding to the ester group in the presence of the corresponding alkali alcoholate and orthosilicic acid tetraalkyl ester having 2 to 6 carbon atoms in the ester group under pressure and in the liquid phase at a temperature above the boiling point of the reaction mixture.
Claim 2
Dependent Claim
73 words
A process for preparing an orthosilicic acid tetraaalkyl ester having 2 to 6 C atoms in the ester group which comprises contacting metallic silicon with an alcohol corresponding to the ester group in the presence of the corresponding alkali alcoholate and orthosilicic acid tetraalkyl ester having 2 to 6 carbon atoms in the ester group under pressure and in the liquid phase at a temperature above the boiling point of the reaction mixture.
Claim 3
Dependent Claim
26 words
A process according to claim 1 wherein the process is performed at a temperature between 160° and 210° C. under pressure up to 50 atmospheres gauge.
Claim 4
Dependent Claim
19 words
A process according to claim 2 wherein the pressure is regulated by bleeding off hydrogen formed during the reaction.
Claim 5
Dependent Claim
51 words
A process according to claim 2 wherein the process is conducted continuously, silicon is introduced into the reactor in the form of a dispersion in alcohol or in the desired silicic acid ester and the formed ester is withdrawn together with hydrogen formed in the process in a mixture with alcohol.
Claim 6
Dependent Claim
35 words
A process according to claim 1 wherein the reaction mixture initially contains orthosilicic acid tetraalkyl ester having 2 to 6 carbon atoms in the ester group before the metallic silicon is reacted with the alcohol.
References Cited (Backward Citations)
US3627807A
Cited
US3803197A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-21 | 1983-07-23 | 1984-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-21 | 1987-07-23 | 1988-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-21 | 1991-07-23 | 1992-01-22 | $7700.00 | Window Closed / Lapsed |