Patent US4113761A successfully refreshed from Google Patents.
US4113761A
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Method of preparing orthosilicic acid alkyl esters
Assignee: Dynamit Nobel AG
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Filing: 1976-07-19
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Granted: 1978-09-12
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Expires: 1996-07-19
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 03:31
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
63 words
A process for preparing an orthosilicic acid tetraalkyl 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 A. in the additional presence of a surface active substance; or B. in the additional presence of a compound containing a methoxy group.
Claim 2
Dependent Claim
63 words
A process for preparing an orthosilicic acid tetraalkyl 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 A. in the additional presence of a surface active substance; or B. in the additional presence of a compound containing a methoxy group.
Claim 3
Dependent Claim
54 words
A process according to claim 1 wherein the reaction is carried out in the presence of a compound containing a methoxy group and said compound is present in the reaction mixture in an amount of from 5 to 20 percent by weight based upon the amount of silicon charged and reckoned as methoxy groups.
Claim 4
Dependent Claim
54 words
A process according to claim 1 wherein the reaction is carried out in the presence of a compound containing a methoxy group and said compound is present in the reaction mixture in an amount of from 8 to 15 percent by weight based upon the amount of silicon charged and reckoned as methoxy groups.
Claim 5
Dependent Claim
24 words
A process according to claim 2 wherein sodium methylate is employed as the methoxy group-containing compound and the same is employed in solid form.
Claim 6
Dependent Claim
29 words
A process according to claim 1 wherein the process is carried out in the presence of a surface active agent and the surface active substance is a wetting agent.
Claim 7
Dependent Claim
29 words
A process according to claim 1 wherein the process is carried out in the presence of a surface active agent and the surface active substance is a flotation agent.
Claim 8
Dependent Claim
32 words
A process according to claim 1 wherein the process is carried out in the presence of a surface active agent and the surface active substance is a nitrogenous organic base or inhibitor.
Claim 9
Dependent Claim
26 words
A process according to claim 1 wherein the metallic silicon is in the form FeSi and has a silicon content of more than 50% by weight.
Claim 10
Dependent Claim
18 words
A process according to claim 8 wherein the FeSi has a grain size no greater than 100 microns.
Claim 11
Dependent Claim
29 words
A process according to claim 1 wherein a portion of the reaction mixture is withdrawn distillatively and its condensate is returned to the reaction vessel through a water-withdrawing agent.
Claim 12
Dependent Claim
41 words
A process according to claim 1 wherein said alcohol is ethanol, said alkali alcoholate is sodium ethylate and the process is carried out in the additional presence of a compound containing a methoxy group, said compound being silicic acid methyl ester.
Claim 13
Dependent Claim
39 words
A process according to claim 1 wherein said alcohol is ethanol, said alkali alcoholate is sodium ethylate and the process is carried out in the additional presence of a compound containing a methoxy group, said compound being sodium methylate.
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) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |