US4197252A
Expired / Lapsed
US
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Process for the preparation of orthosilicic acid tetraalkoxyalkyl esters
Assignee: Dynamit Nobel AG
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Filing: 1974-10-30
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Granted: 1980-04-08
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Expires: 1994-10-30
Abstract
Abstract A process for preparing an orthosilicic acid tetraester of a monoalkyl ether of an aliphatic glycol having 2 to 6 carbon atoms which comprises contacting silicon, iron silicide or ferrosilicon with a monoalkyl ether of an aliphatic glycol having 2 to 6 carbon atoms in the aliphatic chain in the presence of the corresponding orthosilicic acid tetraalkoxy alkyl ether at a temperature between 125 and 250° C.
Inventors
- 👤 Wilhelm Joch
- 👤 Arnold Lenz
- 👤 Walter Rogler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:02
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
89 words
A process for preparing an orthosilicic acid tetraester of a monoalkyl ether of an aliphatic glycol having 2 to 6 carbon atoms which comprises contacting silicon, iron silicide or ferrosilicon with a monoalkyl ether of an aliphatic glycol having 2 to 6 carbon atoms in the first alcohol chain in the presence of the corresponding orthosilicic acid tetraalkoxy alkyl ester present in an amount of 70 to 99 weight percent, based upon the total amount of liquid in the reaction vessel at a temperature between 125° and 250° C.
Claim 2
Dependent Claim
89 words
A process for preparing an orthosilicic acid tetraester of a monoalkyl ether of an aliphatic glycol having 2 to 6 carbon atoms which comprises contacting silicon, iron silicide or ferrosilicon with a monoalkyl ether of an aliphatic glycol having 2 to 6 carbon atoms in the first alcohol chain in the presence of the corresponding orthosilicic acid tetraalkoxy alkyl ester present in an amount of 70 to 99 weight percent, based upon the total amount of liquid in the reaction vessel at a temperature between 125° and 250° C.
Claim 3
Dependent Claim
40 words
A process according to claim 1 wherein to a reaction vessel containing orthosilicic acid tetraalkoxy alkyl ester there is added silicon, iron silicide or ferrosilicon, the corresponding ether-alcohol of said ester, and an alkali metal ether alcoholate of said alcohol.
Claim 4
Dependent Claim
15 words
A process according to claim 1 wherein said alkali metal alcoholate is a sodium alcoholate.
Claim 5
Dependent Claim
38 words
A process according to claim 1 wherein said ester is orthosilicic acid tetra-(2-methoxyl ethyl)-ester and said ether is 2-methoxyethanol, the process is carried out at 140° to 190° C. using silicon having a purity of greater than 98%.
Claim 6
Dependent Claim
37 words
A process according to claim 1 wherein said ester is orthosilicic acid tetra-(2-ethoxyethyl)-ester and said ether is 2-ethoxyethanol, the process is carried out at 140° to 190° C. using silicon having a purity of greater than 98%.
Claim 7
Dependent Claim
35 words
A process according to claim 1 wherein said ester is an orthosilicic acid tetra-(alkyl-diglycol)-ester whose alkyl radical has 1-4 carbon atoms and the process is carried out at a temperature between 190° and 250° C.
Claim 8
Dependent Claim
38 words
A process according to claim 1 wherein said ester is orthosilicic acid tetra-(2-propoxylethyl)-ester, the ether is 2-propoxyethanol and the process is carried out at a temperature between 180° and 225° C. using silicon of purity greater than 98%.
Claim 9
Dependent Claim
38 words
A process according to claim 1 wherein said ester is orthosilicic acid tetra-(2-butoxyethyl)-ester, the ether is 2-butoxyethanol and the process is carried out at a temperature between 180° and 225° C. using silicon of purity greater than 98%.
Claim 10
Dependent Claim
33 words
A process according to claim 1 wherein the reactants are present in the following weight percent amounts: silicon, iron silicide or ferrosilicon 1 to 80 monoalkyl ether of aliphatic glycol 1 to 30.
Claim 11
Dependent Claim
33 words
A process according to claim 1 wherein the following reactants are present in the following weight percent amounts: silicon, iron silicide or ferrosilicon 1 to 80 alkali metal ether alcoholate 0.4 to 5.
Claim 12
Dependent Claim
32 words
A process according to claim 1 wherein to a reaction vessel containing orthosilicic acid tetraalkoxyalkyl ester, alkali metal and silicon, iron silicide or ferrosilicon there is added the corresponding monoalkyl ether 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) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |