US4226793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of monomeric and oligomeric silicic acid esters
Assignee: Dynamit Nobel AG
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Filing: 1978-09-28
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Granted: 1980-10-07
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Expires: 1998-09-28
Abstract
Abstract An improvement in a process for forming an orthosilicic acid ester or an oligomer thereof by contacting a tetrachlorosilane or higher homolog thereof with a primary alcohol, the improvement which comprises introducing the alcohol directly into a tetrachlorosilane liquid phase without said alcohol touching the gas phase and, after completion of the reaction, removing hydrogen chloride formed during the reaction from the reaction zone.
Inventors
- 👤 Hans-Joachim Kotzsch
- 👤 Claus-Dietrich Seiler
- 👤 Hans-Joachim Vahlensieck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:58
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
76 words
In a process for the manufacture of an orthosilicic acid ester or an oligomer thereof wherein a tetrachlorosilane or a higher homolog thereof is contacted with a primary alcohol, in some instances with the addition of water, the improvement which comprises introducing the alcohol directly into a tetrachlorosilane or higher homolog thereof liquid phase without said alcohol touching the gas phase and, after completion of the reaction, removing any residual hydrogen chloride from the reaction zone.
Claim 2
Dependent Claim
76 words
In a process for the manufacture of an orthosilicic acid ester or an oligomer thereof wherein a tetrachlorosilane or a higher homolog thereof is contacted with a primary alcohol, in some instances with the addition of water, the improvement which comprises introducing the alcohol directly into a tetrachlorosilane or higher homolog thereof liquid phase without said alcohol touching the gas phase and, after completion of the reaction, removing any residual hydrogen chloride from the reaction zone.
Claim 3
Dependent Claim
20 words
A process according to claim 1 wherein the alcohol is introduced into the liquid phase at a slightly elevated pressure.
Claim 4
Dependent Claim
19 words
A process according to claims 1 or 2 wherein the reaction is effected without the application of external heat.
Claim 5
Dependent Claim
17 words
A process according to claim 1 wherein the alcohol employed is one which is free of water.
Claim 6
Dependent Claim
44 words
A process according to claim 1 wherein water is added to the reaction mixture without said water touching the gas phase and the reaction mixture is heated to a temperature between 40° and 100° C. whereby there is obtained an oligomeric silicic acid ester.
Claim 7
Dependent Claim
17 words
A process according to claim 5 wherein an inret gas is additionally added to the reaction mixture.
Claim 8
Dependent Claim
12 words
A process according to claim 6 wherein said inert gas is nitrogen.
Claim 9
Dependent Claim
29 words
A process according to claim 5 wherein the alcohol added to the reaction mixture is in admixture with an amount of water corresponding to the desired degree of oligomerization.
Claim 10
Dependent Claim
35 words
A process according to claim 1 wherein the silane reactant has the formula Cl.sub.3 Si[O-Si(Cl.sub.2)].sub.n Cl wherein n is a value between 1 and 10 and the reaction is effected employing alcohol free of water.
Claim 11
Dependent Claim
15 words
A process according to claim 9 wherein n is a value between 1 and 6.
Claim 12
Dependent Claim
20 words
A process according to claim 1 wherein the reaction is effected in the presence of a hydrocarbon or chlorohydrocarbon solvent.
Claim 13
Dependent Claim
22 words
A process according to claim 1 wherein the reaction is completed before removal of any residual hydrogen chloride from the reaction zone.
Claim 14
Dependent Claim
22 words
A process according to claim 1 wherein all of the chlorine atoms of the tetrachlorosilane are esterified prior to hydrogen chloride removal.
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) | 1983-10-07 | 1984-04-07 | 1984-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-07 | 1988-04-07 | 1988-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-07 | 1992-04-07 | 1992-10-07 | $7700.00 | Window Closed / Lapsed |