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Patent US4234503A successfully refreshed from Google Patents.
US4234503A
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Method of preparing gamma aminopropyl alkoxy silanes
Assignee: Dynamit Nobel AG
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Filing: 1978-12-21
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Granted: 1980-11-18
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Expires: 1998-12-21
Abstract
Abstract A process for preparing a gamma amino propyl alkoxy silane of the formula ##STR1## wherein R is an alkyl moiety of 1 to 4 carbon atoms, R' is methyl or phenyl, and y is 0, 1 or 2 which comprises contacting the corresponding gamma-chloropropyl alkoxy silane with ammonia under pressure at a temperature between 50° and 90° C. while stirring the reaction mixture.
Inventors
- 👤 Fritz-Robert Kappler
- 👤 Claus-Dietrich Seiler
- 👤 Hans-Joachim Vahlensieck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:55
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/18; C07F7/1804; C07F7/1872; C07F7/1892
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
67 words
In a method of preparing γ-aminopropylalkoxysilanes of the formula ##STR4## wherein R is an alkyl moiety with 1 to 4 carbon atoms and R' is the methyl or phenyl moiety and y=0 or 1 or 2, by reacting γ-chloropropylalkoxysilanes with ammonia at elevated temperatures and under pressure, the improvement wherein the reaction takes place while the mixture is stirred at temperatures of between 50° and 90° C.
Claim 2
Dependent Claim
67 words
In a method of preparing γ-aminopropylalkoxysilanes of the formula ##STR4## wherein R is an alkyl moiety with 1 to 4 carbon atoms and R' is the methyl or phenyl moiety and y=0 or 1 or 2, by reacting γ-chloropropylalkoxysilanes with ammonia at elevated temperatures and under pressure, the improvement wherein the reaction takes place while the mixture is stirred at temperatures of between 50° and 90° C.
Claim 3
Dependent Claim
17 words
A method according to claim 1 wherein the reaction is conducted at a temperature below 90° C.
Claim 4
Dependent Claim
20 words
A method according to claim 2 wherein the molar ratio of ammonia to gamma-chloropropyl alkoxy silane is at least 20:1.
Claim 5
Dependent Claim
18 words
A method according to claim 3 wherein the molar ratio of ammonia to gamma-chloropropyl alkoxy silane is 30-80:1.
Claim 6
Dependent Claim
16 words
A method according to claim 3 wherein the reaction temperature is between 60° and 75° C.
Claim 7
Dependent Claim
23 words
A method according to claim 1 wherein the reaction mixture is stirred with a stirrer at a rate of 50 to 600 rpm.
Claim 8
Dependent Claim
14 words
A method according to claim 1 wherein the silane reactant is gamma-chloropropyl triethoxy silane.
Claim 9
Dependent Claim
17 words
A method according to claim 1 wherein the pressure within the reaction vessel is below 40 bar.
Claim 10
Dependent Claim
19 words
A method according to claim 8 wherein the pressure within the reaction vessel is within 30 and 35 bar.
Claim 11
Dependent Claim
17 words
A method according to claim 1 wherein more than 50% of the ammonia is in liquid form.
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) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |