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US3590065A
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Method of preparing mercaptoalkylalkoxy silanes
Assignee: Dow Silicones Corp
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Filing: 1969-07-18
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Granted: 1971-06-29
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Expires: 1989-07-18
Abstract
Abstract MERCAPTOALKYALKOXY SILANCES ARE PREPARED BY THE SIMULTANEOUS REACTION OF CHLOROALKYLALKOXY SILANES, THIOUREA OR TETRAMETHYL THIOUREA AND AMMONIA AT A TEMPERATURE OF 100 TO 145*C. THE REACTION IS CHARACTERIZED BY EXCELLENT YIELDS OF THE DESIRED MERCAPTOALKYLALKOXY SILANES WITHOUT THE NECESSITY OF USING SOLVENT AND WIHTOUT THE FORMATION OF UNDESIRED BY-PRODUCTS. FOR EXAMPLE, CHLOROPROPYL-TRIMETHOXYSILANE IS REACTED WITH THOUREA AND AMMONIA AT 125*C. TO PRODUCE MERCAPTOPROPYLTRIMETHOXYSILANE AND GUANIDENE HYDROCHLORIDE.
Inventors
- 👤 Joseph A Rakus
- 👤 James G Sharpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:44
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/18; C07F7/1804; C07F7/1872; C07F7/1892
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |