US4564709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of dialkyl-trisulfides
Assignee: Arkema Inc
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Filing: 1983-02-12
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Granted: 1986-01-14
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Expires: 2003-02-12
Abstract
Abstract Dialkyl-trisulfides having a minimum grade of copper-strip corrosivity which are suitable as extreme-pressure additives, are produced at high selectivity by reacting alkyl-mercaptans and sulfur at a quantitative ratio in a range of 0.5 to 1.0 gram atom of sulfur to 1 mol of alkyl-mercaptan in the presence of magnesium oxide as catalyst.
Inventors
- 👤 Yuichiro Koyama
- 👤 Hiroshi Nakazawa
- 👤 Toshiaki Yamashita
- 👤 Hitoshi Moriyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:24
CPC Classifications
C; C07; C07C; C07C319/00; C07C319/22; C07C319/24
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
74 words
A process for the selective production of dialkyl trisulfides which consists essentially of reacting sulfur and an alkyl mercaptan at a quantitative ratio in the range of 0.5 gram atom to 1.0 gram atom of sulfur to 1 mol of alkyl mercaptan in the presence of magnesium oxide in an amount of 0.1 to 3 percent by weight of said alkylmercaptan and carried out at a temperature in the range of 30° C.-100° C.
Claim 2
Dependent Claim
74 words
A process for the selective production of dialkyl trisulfides which consists essentially of reacting sulfur and an alkyl mercaptan at a quantitative ratio in the range of 0.5 gram atom to 1.0 gram atom of sulfur to 1 mol of alkyl mercaptan in the presence of magnesium oxide in an amount of 0.1 to 3 percent by weight of said alkylmercaptan and carried out at a temperature in the range of 30° C.-100° C.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein said alkyl mercaptan contains a straight or branched chain alkyl group of 3 to 18 carbon atoms.
Claim 4
Dependent Claim
15 words
The process of claim 2 wherein said alkyl mercaptan is tertiarynonyl mercaptan or tertiarydodecyl mercaptan.
Claim 5
Dependent Claim
14 words
The process of claim 1 carried out for 0.5 to 2 hours under stirring.
Claim 6
Dependent Claim
14 words
The process of claim 3 carried out for 0.5 to 2 hours under stirring.
Claim 7
Dependent Claim
24 words
The process of claim 1 wherein said sulfur is present in a range of 0.6 to 0.95 gram atom per mol of alkyl mercaptan.
Claim 8
Dependent Claim
23 words
The process of claim 6 wherein said sulfur is present in a range of 0.6 to 0.8 gram per mol of alkyl mercaptan.
Claim 9
Dependent Claim
24 words
The process of claim 3 wherein said sulfur is present in a range of 0.6 to 0.95 gram atom per mol of alkyl mercaptan.
Claim 10
Dependent Claim
24 words
The process of claim 8 wherein said sulfur is present in a range of 0.6 to 0.8 gram atom per mol of alkyl mercaptan.
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) | 1989-01-13 | 1989-07-15 | 1990-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-13 | 1993-07-15 | 1994-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-13 | 1997-07-15 | 1998-01-14 | $7700.00 | Window Closed / Lapsed |