US4012403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of mercapto-substituted silicon compounds
Assignee: OSI Specialties Inc
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Filing: 1976-03-18
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Granted: 1977-03-15
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Expires: 1996-03-18
Abstract
Abstract This invention relates to a method of reducing beta -cyanoethyltrialkoxysilane to the corresponding mercaptopropyltrialkoxysilane by reaction with sulfur.
Inventors
- 👤 Jeffrey Yick Pui Mui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:52
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/18; C07F7/1804; C07F7/1872; C07F7/1892; C07F7/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
The process of reducing β-cyanoethyltrialkoxysilane to mercaptopropyltrialkoxysilane which comprises reacting said cyanoethyltrialkyloxysilane at a temperature between about 50° C and about 300° C with sulfur and hydrogen in the ratio of at least 3 moles of hydrogen for each mole of the silane and at least one mole of sulfur for each mole of the silane, in the presence of about 0.001 to about 10 weight percent based on the weight of the silane, sulfur and hydrogen, of a sulfide or polysulfide of a transition metal consisting of cobalt, nickel, titanium, rhenium and molybdenum.
Claim 2
Dependent Claim
94 words
The process of reducing β-cyanoethyltrialkoxysilane to mercaptopropyltrialkoxysilane which comprises reacting said cyanoethyltrialkyloxysilane at a temperature between about 50° C and about 300° C with sulfur and hydrogen in the ratio of at least 3 moles of hydrogen for each mole of the silane and at least one mole of sulfur for each mole of the silane, in the presence of about 0.001 to about 10 weight percent based on the weight of the silane, sulfur and hydrogen, of a sulfide or polysulfide of a transition metal consisting of cobalt, nickel, titanium, rhenium and molybdenum.
References Cited (Backward Citations)
US2230390A
Cited
US3565937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |