Patent US4234502A successfully refreshed from Google Patents.
US4234502A
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Method of preparing aminoalkylsilanes
Assignee: Dynamit Nobel AG
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Filing: 1978-11-16
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Granted: 1980-11-18
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Expires: 1998-11-16
Abstract
Abstract An improved process for the production of an aminoalkylsilane by reaction of a chloroalkylsilane with ammonia or alkylamine at an elevated temperature or pressure wherein the chloroalkylsilane is added in a less than stoichiometric ratio to the ammonia or alkylamine preheated in a pressure vessel at a temperature between 50° and 200° C. Thereafter the reaction is carried out in a known manner within the temperature range of 50° to 200° C. By this manipulative technique, a higher yield of aminoalkylsilane is obtained per unit of time and the aminoalkylsilane is obtained in a greater purity.
Inventors
- 👤 Fritz-Robert Kappler
- 👤 Claus-Dietrich Seiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:19
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/18; C07F7/1804; C07F7/1872; C07F7/1892
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
68 words
In a method of preparing an aminoalkylsilane by contacting a chloroalkylsilane with ammonia or an alkylamine at a an elevated temperature under pressure, the improvement which comprises introducing the chloroalkylsilane in a less than stoichiometric ratio to the ammonia or alkylamine preheated in a pressure vessel at a temperature between 50° and 200° C. and thereafter carrying out the reaction at a temperature between 50° and 200° C.
Claim 2
Dependent Claim
68 words
In a method of preparing an aminoalkylsilane by contacting a chloroalkylsilane with ammonia or an alkylamine at a an elevated temperature under pressure, the improvement which comprises introducing the chloroalkylsilane in a less than stoichiometric ratio to the ammonia or alkylamine preheated in a pressure vessel at a temperature between 50° and 200° C. and thereafter carrying out the reaction at a temperature between 50° and 200° C.
Claim 3
Dependent Claim
12 words
A process according to claim 1 wherein the reaction mixture is stirred.
Claim 4
Dependent Claim
19 words
A process according to claim 1 wherein the process is performed at a temperature between 50° and 90° C.
Claim 5
Dependent Claim
14 words
A process according to claim 1 wherein the chloroalkylsilane reactant is a chloroalkyl alkoxysilane.
Claim 6
Dependent Claim
45 words
A process according to claim 4 wherein the chloroalkylalkoxysilane has the formula ##STR2## wherein R represents an alkyl moiety of 1 to 3 carbon atoms, R' represents a methyl radical, n is a value between 1 and 3 and x is 0, 1 or 2.
Claim 7
Dependent Claim
34 words
A process according to claim 1 wherein the chloroalkylsilane is one having the formula Cl(CH.sub.2).sub.n Si(OR).sub.3 wherein R represents an alkyl moiety of 1 to 3 carbon atoms and n represents 1,2 or 3.
Claim 8
Dependent Claim
13 words
A process according to claim 1 wherein the chloroalkylsilane is added to ammonia.
Claim 9
Dependent Claim
14 words
A process according to claim 1 wherein the chloroalkylsilane is added to an alkylamine.
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 |