US4217294A
Expired / Lapsed
US
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Method for producing mercaptan-containing organosilicon compounds
Assignee: OSI Specialties Inc
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Filing: 1979-03-30
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Granted: 1980-08-12
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Expires: 1999-03-30
Abstract
Abstract A two-stage process for producing gamma-mercaptopropyltrialkoxysilane which comprises reacting beta-cyanoethyltrialkoxysilane with hydrogen sulfide in the presence of an amide to form a novel gamma-trialkoxysilylthiopropionamide intermediate followed by reducing said intermediate with hydrogen in the presence of a transition metal polysulfide.
Inventors
- 👤 Herbert E. Petty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:40
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
104 words
A process for preparing gamma-mercaptopropyltrialkoxysilane which comprises reacting beta-cyanoethyltrialkoxysilane with about one mole of hydrogen sulfide in the presence of an amine catalyst at a temperature not exceeding 100° C. to form a beta-(thiocarboxamido) ethyltrialkoxysilane intermediate and subsequently reacting the beta-(thiocarboxamido) ethyltrialkoxysilane with hydrogen under pressure, at a temperature between about 100° C. and about 300° C., in the ratio of at least two moles of hydrogen for each mole of the silane, and in the presence of about 0.01 to about 10 weight percent, based on the weight of the silane and hydrogen, of a transition metal polysulfide catalyst to form a gamma-mercaptopropyltrialkoxysilane.
Claim 2
Dependent Claim
104 words
A process for preparing gamma-mercaptopropyltrialkoxysilane which comprises reacting beta-cyanoethyltrialkoxysilane with about one mole of hydrogen sulfide in the presence of an amine catalyst at a temperature not exceeding 100° C. to form a beta-(thiocarboxamido) ethyltrialkoxysilane intermediate and subsequently reacting the beta-(thiocarboxamido) ethyltrialkoxysilane with hydrogen under pressure, at a temperature between about 100° C. and about 300° C., in the ratio of at least two moles of hydrogen for each mole of the silane, and in the presence of about 0.01 to about 10 weight percent, based on the weight of the silane and hydrogen, of a transition metal polysulfide catalyst to form a gamma-mercaptopropyltrialkoxysilane.
Claim 3
Dependent Claim
11 words
A process as in claim 2 wherein the beta-(thiocarboxamido)ethyltrialkoxysilane is beta-(thiocarboxamido)ethyltriethoxysilane.
Claim 4
Dependent Claim
14 words
A process as in claim 1 wherein the reaction temperature is about 200° C.
Claim 5
Dependent Claim
16 words
A process as in claim 1 wherein the weight percent of the catalyst is about 2.5.
Claim 6
Dependent Claim
12 words
A process as in claim 1 wherein the catalyst is cobalt trisulfide.
Claim 7
Dependent Claim
33 words
A process for preparing gamma-mercaptopropyltriethoxysilane which comprises reacting beta-(thiocarboxamido)ethyltriethoxysilane with hydrogen, in a pressure reactor, at a temperature of about 200° C., wherein there is present about 2.5 weight percent of cobalt trisulfide.
Claim 8
Dependent Claim
33 words
A process for preparing gamma-mercaptopropyltriethoxysilane which comprises reacting beta-(thiocarboxamido)ethyltriethoxysilane with hydrogen, in a pressure reactor, at a temperature of about 200° C., wherein there is present about 2.5 weight percent of cobalt trisulfide.
Claim 9
Dependent Claim
12 words
A compound of the formula ##STR2## wherein R is an alkyl group.
Claim 10
Dependent Claim
12 words
A compound of the formula ##STR2## wherein R is an alkyl group.
Claim 11
Dependent Claim
10 words
A compound as in claim 7 wherein R is ethyl.
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) | 1983-08-12 | 1984-02-11 | 1984-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-12 | 1988-02-11 | 1988-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-12 | 1992-02-11 | 1992-08-12 | $7700.00 | Window Closed / Lapsed |