Lubricants, Greases and Aqueous Fluids Containing Additives Derived from Dimercaptothiadiazole Polymers

Abstract

The present invention relates to the composition comprising an oil of lubricating viscosity and a mixture of at least one dimercaptothiadiazole polymer or derivative thereof; and at least one carboxylic acid. These products generally show an ability to improve antiwear (including extreme pressure) and corrosion properties in lubricants.

1 . The composition comprising (A) an oil of lubricating viscosity and (B) a salt of a reaction product of (a) at least one dimercaptothiadiazole polymer and (b) at least one carboxcylic acid. 
   
   
       2 . The composition of  claim 1 , wherein the acid (b) contains from  3  to about 30 carbon atoms. 
   
   
       3 . The composition of  claim 2 , wherein the acid (b) is octenoic, decenoic, dodecenoic, oleic, euricic or succinic. 
   
   
       4 . The composition of  claim 1 , wherein about 1 to about 2 moles of (a) are reacted with each mole of (b). 
   
   
       5 . The composition of  claim 1 , wherein approximately equal molar amounts of (a) and (b) are reacted. 
   
   
       6 . The composition of  claim 1 , wherein (B) is an alkaline earth or transition metal salt. 
   
   
       8 . The composition of  claim 1 , wherein (B) is an ammonium salt derived from an amine. 
   
   
       9 . The composition of  claim 8 , wherein the amine is a tertiary alkyl primary amine containing from about 4 to about 28 carbon atoms. 
   
   
       10 . The composition of  claim 1 , further comprising (C) a sulfurized organic compound. 
   
   
       11 . The composition of  claim 1 , wherein (B) contains sulfur-sulfur bonds. 
   
   
       12 . The composition of  claim 1 , wherein the lubricating composition is a gear oil. 
   
   
       13 . A composition comprising (A) an oil of lubricating viscosity and (B) a salt of a bis(dimercapto)thiadiazole polymer. 
   
   
       14 . The composition of  claim 13 , wherein each carboxyl group independently contains from about 3 to about 30 carbon atoms. 
   
   
       15 . The composition of  claim 13 , wherein each active group is independently derived from carboxcylic acids. 
   
   
       16 . The composition of  claim 14 , wherein (B) is an alkaline earth or transition metal salt. 
   
   
       17 . The composition of  claim 13 , wherein (B) is a zinc salt. 
   
   
       18 . The composition of  claim 13 , wherein (B) is an ammonium salt derived from an amine. 
   
   
       19 . The composition of  claim 18 , wherein the amine is a tertiary alkyl primary amine containing from about 4 to about 28 carbon atoms. 
   
   
       20 . The composition of  claim 13 , wherein (B) contains sulfur-sulfur bonds.