Alkali and alkaline earth thiadiazole additives and lubricating compositions containing the same

1. An extreme pressure additive composition for use in grease, comprising alkaline earth metal derivatives of 2,5-dimercapto-1,3,4-thiadiazole (DMTD) complexed to alkylene glycol fluids and/or polyalkylene glycol fluids, wherein the alkaline earth metal derivatives of 2,5-dimercapto-1,3,4-thiadiazole (DMTD) are according to the following formula

wherein n is 1, X 1 is hydrogen, X 2 is an alkaline earth metal chosen from the group consisting of beryllium, magnesium, calcium, strontium, barium and radium, and X 3 is hydrogen.

2. The additive composition of claim 1 , wherein the metal is magnesium or calcium.

3. The additive composition of claim 2 , wherein the alkaline earth metal derivatives of 2,5-dimercapto-1,3,4-thiadiazole (DMTD) are complexed with triethylene glycol monobutyl ether.

4. An extreme pressure and antiwear composition for use in grease, comprising:

(a) an alkali and/or alkaline earth metal derivatives of 2,5-dimercapto-1,3,4-thiadiazole (DMTD) complexed to alkylene glycol fluids and/or PAG fluids, and

(b) an organophosphorus compound;

wherein the alkali or alkaline earth metal derivatives of 2,5-dimercapto-1,3,4-thiadiazole (DMTD) are according to the following formula;

wherein n is 1, X 1 is hydrogen, X 2 is an alkaline earth metal, and X 3 is hydrogen; or wherein n is 0, X 1 is an alkali metal, and X 3 is hydrogen.

5. The composition of claim 4 wherein the alkali metal is lithium or potassium, and the alkaline earth metal is magnesium or calcium.

6. The composition of claim 5 , wherein the alkali or alkaline earth metal derivatives of 2,5-dimercapto-1,3,4-thiadiazole (DMTD) are complexed with triethylene glycol monobutyl ether.

7. The composition of claim 5 , wherein the organophosphate compound is an amine phosphate or a metal dithiophosphate.

8. A lubricating composition, comprising:

(a) at least about 95 wt % of a base grease, and

(b) (1) about 0.25-3.0 wt % of a complex of alkaline earth metal derivatives of DMTD with alkylene glycol fluids and/or PAG fluids; or

(2) about 0.25-3.0 wt % of a complex of alkali and/or alkaline earth metal derivatives of DMTD with alkylene glycol fluids and/or PAG fluids; and an organophosphorus antiwear additive in an amount which provides about 50-1500 ppm phosphorus;

wherein the alkali or alkaline earth metal derivatives of 2,5-dimercapto-1,3,4-thiadiazole (DMTD) are according to the following formula:

wherein n is 1, X 1 is hydrogen, X 2 is an alkaline earth metal, and X 3 is hydrogen; or wherein n is 0, X 1 is an alkali metal, and X 3 is hydrogen.

9. The composition of claim 8 , wherein the alkali metal is lithium or potassium, and the alkaline earth metal is magnesium or calcium.

10. The composition of claim 9 , wherein the alkali or alkaline earth metal derivatives of 2,5-dimercapto-1,3,4-thiadiazole (DMTD) are complexed with triethylene glycol monobutyl ether.

11. The composition of claim 9 , wherein the organophosphate compound is an amine phosphate or a metal dithiophosphate.

12. The composition of claim 8 , wherein the complex is present at about 0.50-2.0 wt %, and where if (b)(2) is chosen, the organophosphous compound is present in an amount which provides about 100-1000 ppm phosphorus.

13. The composition of claim 12 , wherein the complex is present at about 1.0-1.5 wt %, and where if (b)(2) is chosen, the organophosphous compound is present in an amount which provides about 200-500 ppm phosphorus.

14. The composition of claim 9 , wherein the complex is present at about 0.50-2.0 wt %, and where if (b)(2) is chosen, the organophosphous compound is present in an amount which provides about 100-1000 ppm phosphorus.

15. The composition of claim 14 , wherein the complex is present at about 1.0-1.5 wt %, and where if (b)(2) is chosen, the organophosphous compound is present in an amount which provides about 200-500 ppm phosphorus.

16. The composition of claim 15 , wherein the complex is present at about 1.5 wt %, and where if (b)(2) is chosen, the organophosphous compound is present in an amount which provides about 330-400 ppm phosphorus.

17. The composition of claim 16 , wherein the organophosphate compound is an amine phosphate or a metal dithiophosphate.