Patent US4323690A successfully refreshed from Google Patents.
US4323690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making silicate esters
Assignee: Carboline Co
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Filing: 1981-04-20
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Granted: 1982-04-06
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Expires: 2001-04-20
Abstract
Abstract Tetra-alkyl and tetra-alkoxyalkyl silicates are made by reacting an alkanol or an alkoxyalkanol with silicon in the presence of an alkali metal carboxylic acid salt.
Inventors
- 👤 John F. Montle
- 👤 Henry J. Markowski
- 👤 Paul D. Lodewyck
- 👤 Daniel F. Schneider, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:57
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
43 words
A process for making tetraalkyl or tetraalkoxyalkyl silicates comprising heating an alkanol or an alkoxyalkanol having from 1 to 6 carbon atoms with finely divided silicon and with an alkali metal carboxylic acid salt, and separating the hydrogen by-product from the reaction mixture.
Claim 2
Dependent Claim
43 words
A process for making tetraalkyl or tetraalkoxyalkyl silicates comprising heating an alkanol or an alkoxyalkanol having from 1 to 6 carbon atoms with finely divided silicon and with an alkali metal carboxylic acid salt, and separating the hydrogen by-product from the reaction mixture.
Claim 3
Dependent Claim
67 words
A process for making tetraethyl silicate comprising heating at a temperature from 140° to 250° C. at elevated pressure ethanol with finely-divided silicon and with an alkali metal carboxylic acid salt, the amount of said alkali metal carboxylic acid salt being equivalent to at least 0.1% by weight of alkali metal based on the total weight of ethanol, and separating the hydrogen by-product from the reaction mixture.
Claim 4
Dependent Claim
67 words
A process for making tetraethyl silicate comprising heating at a temperature from 140° to 250° C. at elevated pressure ethanol with finely-divided silicon and with an alkali metal carboxylic acid salt, the amount of said alkali metal carboxylic acid salt being equivalent to at least 0.1% by weight of alkali metal based on the total weight of ethanol, and separating the hydrogen by-product from the reaction mixture.
Claim 5
Dependent Claim
36 words
The process as claimed in claim 2 in which the amount of said alkali metal carboxylic acid salt is equivalent to 0.4 to 5% by weight of alkali metal based on the total weight of ethanol.
Claim 6
Dependent Claim
75 words
A process for making tetraethyl silicate in admixture with tetramethyl and other silicates comprising heating a mixture of ethanol and methanol with finely-divided silicon and with a alkali metal carboxylic acid salt at a temperature from 140° to 250° C. at elevated pressure, the amount of said salt being equivalent to at least 0.1% by weight of alkali metal based on the total weight of alcohols, and separating the hydrogen by-product from the reaction mixture.
Claim 7
Dependent Claim
75 words
A process for making tetraethyl silicate in admixture with tetramethyl and other silicates comprising heating a mixture of ethanol and methanol with finely-divided silicon and with a alkali metal carboxylic acid salt at a temperature from 140° to 250° C. at elevated pressure, the amount of said salt being equivalent to at least 0.1% by weight of alkali metal based on the total weight of alcohols, and separating the hydrogen by-product from the reaction mixture.
Claim 8
Dependent Claim
35 words
The process as claimed in claim 4 in which the amount of alkali metal carboxylic acid salt is equivalent to 0.4 to 5% by weight of alkali metal based on the total weight of alcohols.
Claim 9
Dependent Claim
33 words
The process as claimed in any of claims 1, 2, 3, 4 or 5 in which said silicon is employed in an amount approximately stoichiometrically equal to the total amount of alcohol present.
Claim 10
Dependent Claim
21 words
The process as claimed in any of claims 1, 2, 3, 4 or 5 in which said alkali metal is sodium.
Claim 11
Dependent Claim
24 words
The process as claimed in any of claims 1, 2, 3, 4 or 5 in which alkali metal carboxylic acid salt is sodium formate.
Claim 12
Dependent Claim
21 words
The process as claimed in any of claims 1, 2, 3, 4 or 5 in which said alkali metal is potassium.
Claim 13
Dependent Claim
25 words
The process as claimed in any of claims 1, 2, 3, 4 or 5 in which said alkali metal carboxylic acid salt is potassium formate.
Claim 14
Dependent Claim
22 words
The process as claimed in any of claims 1, 2, 3, 4 or 5 in which the silicon is present as Ferrosilicon.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-05 | 1985-10-05 | 1986-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-05 | 1989-10-05 | 1990-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-05 | 1993-10-05 | 1994-04-06 | $7700.00 | Window Closed / Lapsed |