Patent ID: 7763574

Claim:
A method for imparting anti-wear properties to a high chrome alloy steel, comprising using an effective amount of a lubricating composition on a high chrome alloy steel surface, the lubricating composition comprising a major amount of a grease or synthetic ester base oil and a minor amount of: (a) a molybdenum compound selected from the group consisting of molybdenum dithiocarbamate, molybdenum dithiophosphate and a mixture thereof; and (b) one or more anti-wear compound(s) selected from the group consisting of: (i) a reaction product of: (A) a thiadiazole dimer having formula (I): where Z is hydrogen, or an alkyloxy linkage having formula (II): or combinations thereof, with R 1 being hydrogen, a branched or straight chain C 1 to C 7 alkyl radical, or combinations thereof and R 2 being hydrogen, a branched or straight chain C 1 to C 7 alkyl radical, or combinations thereof, with n being 1 to 2 and t being 0 or 1; and (B) a poly(ether)glycol having formula (III): where F is a hydroxyl radical, a branched or straight chain C 1 to C 20 alkoxyl radical, a branched or straight chain C 1 to C 20 alkylcarboxyl radical, a mono-substituted, disubstituted, or tri-substituted glycerol residue, hydrogen, or combinations thereof; where R 3 is hydrogen, a methyl radical, or combinations thereof; where R 4 is hydrogen, a branched or straight chain C 1 to C 20 alkyl radical, a phenyl radical, a C 1 to C 8 branched or straight chain alkyl-substituted-phenyl radical, a C 1 to C 20 branched or straight chain acyl radical, or combinations thereof; and with q being 1 to 300; (ii) a reaction product of: (A) a thiadiazole dimer having formula (VI): where d is 1 to 5 and Z is hydrogen, an alkyloxy linkage having formula (II): or combinations thereof, with R 1 being hydrogen, a branched or straight chain C 1 to C 7 alkyl radical, or combinations thereof and R 2 being hydrogen, a branched or straight chain C 1 to C 7 alkyl radical, or combinations thereof, wherein t is 0 or 1; and (B) a poly(ether)glycol having formula (III): where F is a hydroxyl radical, a branched or straight chain C 1 to C 20 alkoxyl radical, a branched or straight chain C 1 to C 20 alkylcarboxyl radical, a mono-substituted, disubstituted, or tri-substituted glycerol residue, hydrogen, or combinations thereof; where R 3 is hydrogen, a methyl radical, or combinations thereof; where R 4 is hydrogen, a branched or straight chain C 1 to C 20 alkyl radical, a phenyl radical, a C 1 to C 8 branched or straight chain alkyl-substituted-phenyl radical, a C 1 to C 20 branched or straight chain acyl radical, or combinations thereof; and with q being 1 to 300; and (iii) a mono or dimercapto-1,3,4-thiadiazole monomer which has the structure of formula (VII): Where R5 is mercaptan, —SH or hydrogen, —H, wherein the weight ratio of the molybdenum compound (a) to the anti-wear compound/compounds (b) is about 1:10 to about 10:1.