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Patent US4198346A successfully refreshed from Google Patents.
US4198346A
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Preparation of trialkoxysilanols
Assignee: Arch Chemicals Inc
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Filing: 1979-06-01
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Granted: 1980-04-15
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Expires: 1999-06-01
Abstract
Abstract An improved method is disclosed for the preparation of trialkoxysilanols. The process involves hydrolysis of corresponding trialkoxyhalosilanes with solid bicarbonate in the presence of a critical catalytic amount of water.
Inventors
- 👤 Karl O. Knollmueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:44
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
97 words
A process for the preparation of sterically hindered trialkoxysilanol compounds of the formula: ##STR4## wherein R' is independently selected from hydrogen, alkyl, alenyl, aryl, or aralkyl, with the proviso that at least a majority of the pendant R' groups attached to the central Si atom are sterically hindered alkyl groups having at least 3 carbon atoms, comprising reacting a corresponding trialkoxyhalosilane of the formula, (R' O) 3 SiX, wherein X is a halogen and R' is defined as above, with solid bicarbonate is a polar non-protonic solvent medium in the presence of a catalytic amount of water.
Claim 2
Dependent Claim
97 words
A process for the preparation of sterically hindered trialkoxysilanol compounds of the formula: ##STR4## wherein R' is independently selected from hydrogen, alkyl, alenyl, aryl, or aralkyl, with the proviso that at least a majority of the pendant R' groups attached to the central Si atom are sterically hindered alkyl groups having at least 3 carbon atoms, comprising reacting a corresponding trialkoxyhalosilane of the formula, (R' O) 3 SiX, wherein X is a halogen and R' is defined as above, with solid bicarbonate is a polar non-protonic solvent medium in the presence of a catalytic amount of water.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein said bicarbonate is NaHCO 3 .
Claim 4
Dependent Claim
25 words
The process of claim 2 wherein the bicarbonate is used in an amount ranging from about 1.3 to about 4 moles per mole of trialkoxyhalosilane.
Claim 5
Dependent Claim
25 words
The process of claim 3 wherein the bicarbonate is used in an amount ranging from about 2.0 to about 3.0 moles per mole of trialkoxyhalosilane.
Claim 6
Dependent Claim
25 words
The process of claim 4 wherein the bicarbonate is used in an amount ranging from about 2.2 to about 2.4 moles per mole of trialkoxyhalosilane.
Claim 7
Dependent Claim
33 words
The process of claim 1 wherein the catalytic amount of water ranges from about 0.1 to about 1.0 percent. by weight based on the weight of solvent prior to the addition of bicarbonate.
Claim 8
Dependent Claim
18 words
The process of claim 6 wherein the water ranges in amount from about 0.2 to about 0.4 percent.
Claim 9
Dependent Claim
18 words
The process of claim 7 wherein the water ranges in amount from about 0.25 to about 0.28 percent.
Claim 10
Dependent Claim
11 words
The process of claim 1 wherein the solvent is an ether.
Claim 11
Dependent Claim
23 words
The process of claim 9 wherein the solvent is selected from the group consisting of diethyl ether, dibutyl ether, tetrahydrofuran, and mixtures thereof.
Claim 12
Dependent Claim
10 words
The process of claim 10 wherein the solvent is tetrahydrofuran.
Claim 13
Dependent Claim
17 words
The process of claim 7 wherein tributoxychlorosilane is reacted with solid NaHCO 3 in a tetrahydrofuran medium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-15 | 1983-10-15 | 1984-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-15 | 1987-10-15 | 1988-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-15 | 1991-10-15 | 1992-04-15 | $7700.00 | Window Closed / Lapsed |