Alkylthioperoxydithiophosphate lubricant additives

Abstract

Alkylthioperoxydiphosphates having an alkyl group between about 4 and 18 carbons, a decomposition temperature between about 150 and 300° C. and a wear volume between about 0.0025 and 0.0015 mm 3 in HFRB testing, and methods of making same. Lubricant additives that includes the alkylthioperoxydiphosphates.

What is claimed is: 
     
         1 . A lubricant additive comprising an alkylthioperoxydiphosphate. 
     
     
         2 . The lubricant additive of  claim 1 , wherein the alkylthioperoxydiphosphate comprises an alkyl group having between about 4 and 18 carbons. 
     
     
         3 . The lubricant additive of  claim 1 , wherein the alkylthioperoxydiphosphate comprises an alkyl group having between about 13 and 18 carbons. 
     
     
         4 . The lubricant additive of  claim 1 , wherein the alkylthioperoxydiphosphate comprises a primary alkyl group. 
     
     
         5 . The lubricant additive of  claim 1 , wherein the alkylthioperoxydiphosphate comprises a secondary alkyl group. 
     
     
         6 . The lubricant additive of  claim 1 , wherein the alkylthioperoxydiphosphate has a decomposition temperature between about 150 and 300° C. 
     
     
         7 . The lubricant additive of  claim 1 , wherein the alkylthioperoxydiphosphate has a wear volume between about 0.0025 and 0.0015 mm 3  in HFRB testing. 
     
     
         8 . The lubricant additive of  claim 1 , wherein the alkylthioperoxydiphosphate is selected from tridecylthioperoxydiphosphate, 1-methyl dodecylthioperoxydiphosphate, tetradecylthioperoxydiphosphate, and octadecylthioperoxydiphosphate. 
     
     
         9 . An alkylthioperoxydiphosphate comprising alkyl chains having between 13 and 18 carbons. 
     
     
         10 . The alkylthioperoxydiphosphate of  claim 9 , wherein the alkylthioperoxydiphosphate comprises a primary alkyl group. 
     
     
         11 . The alkylthioperoxydiphosphate of  claim 9 , wherein the alkylthioperoxydiphosphate comprises a secondary alkyl group. 
     
     
         12 . The alkylthioperoxydiphosphate of  claim 9 , wherein the alkylthioperoxydiphosphate has a decomposition temperature between about 150 and 300° C. 
     
     
         13 . The alkylthioperoxydiphosphate of  claim 9 , wherein the alkylthioperoxydiphosphate has a wear volume between about 0.0025 and 0.0015 mm 3  in HFRB testing. 
     
     
         14 . The alkylthioperoxydiphosphate of  claim 9 , wherein the alkylthioperoxydiphosphate is selected from tridecylthioperoxydiphosphate, 1-methyl dodecylthioperoxydiphosphate, tetradecylthiopemxydiphosphate, and octadecylthioperoxydiphosphate. 
     
     
         15 . A method for making an alkylthioperoxydiphosphate comprising the steps:
 mixing phosphorus pentasulfide with alcohol at an elevated temperature in toluene to produce an O,O-dialkyl dithiophosphoric acid; and oxidizing the O,O-dialkyl dithiophosphoric acid by adding H 2 O 2  solution (37%) to the O,O-dialkyl dithiophosphoric acid.   
     
     
         16 . The method of  claim 15 , wherein the O,O-dialkyl dithiophosphoric acid is vigorously stirred during the addition of the H 2 O 2  solution. 
     
     
         17 . The method of  claim 15 , wherein the O,O-dialkyl dithiophosphoric acid is held in an ice bath. 
     
     
         18 . The method of  claim 15 , wherein the alkylthioperoxydiphosphate is selected from tridecylthioperoxydiphosphate, 1-methyl dodecylthioperoxydiphosphate, tetradecylthioperoxydiphosphate, and octadecylthioperoxydiphosphate.