Claims
- 1. A process for the preparation of bis-(2,5-polythio-1,3,4-thiadiazole) comprising reacting 2,5-dimercapto-1,3,4-thiadiazole and elemental sulfur in water with hydrogen peroxide at a temperature ranging from 20.degree. C. to 100.degree. C. wherein the molar ratio of 2,5-dimercapto-1,3,4-thiadiazole to hydrogen peroxide is 1:1 to 1.5:1 and the molar ratio of 2,5-dimercapto-1,3,4-thiadiazole to elemental sulfur ranges from 16:1 to 1:1.
- 2. The process of claim 1 wherein the reaction is conducted at a temperature of from 50.degree. C. to 95.degree. C.
- 3. The process of claim 1 wherein the molar ratio of 2,5-dimercapto-1,3,4-thiadiazole to elemental sulfur ranges from 4:1 to 2:1.
- 4. The process of claim 1 wherein the elemental sulfur and 2,5-dimercapto-1,3,4-thiadiazole are initially introduced in the form of a suspension in water, followed by the addition of hydrogen peroxide.
- 5. The process of claim 1 wherein the molar ratio of 2,5-dimercapto-1,3,4-thiadiazole to hydrogen peroxide ranges from 1:1 to 1.25:1.
Parent Case Info
This is a divisional of application Ser. No. 08/189,332, filed on Jan. 31, 1994, presently pending, which is a divisional of application Ser. No. 07/935,324, filed on Aug. 26, 1992, now U.S. Pat. No. 5, 310,921.
US Referenced Citations (4)
Foreign Referenced Citations (2)
Number |
Date |
Country |
3330919 |
Mar 1985 |
DEX |
4013714 |
Oct 1991 |
DEX |
Divisions (2)
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Number |
Date |
Country |
Parent |
189332 |
Jan 1994 |
|
Parent |
935324 |
Aug 1992 |
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