| abstract |
PURPOSE:A lubricating oil composition, obtained by adding a specific amount of a reaction product between zinc dithiophosphate and a triamine or tetramine to a lubricating base oil, and having improved abrasion resistance. CONSTITUTION:A lubricating oil composition obtained by adding about 0.05- 5wt% reaction product between zinc dithiophosphate and a triamine or tetramine, mainly a complex expressed by the formula (R1 and R2 are 3-12C alkyl, aryl or alkylaryl; R' is 2-12C alkylene; A, B, C and D are H, 1-18C alkyl, arylalkyl, cycloalkyl or alkylaryl; n and n' are 1 or 2; m is 1-4) to a lubricating base oil. |