| abstract |
(57) [Summary] [Structure] An ultrabasic cleaning additive, optionally modified by reaction with a boron derivative, and a general formula X-R 1 is represented by -Sx-R 3 -Sy-R 2 -COOH, obtained by reaction of a carboxylic acid containing a "small size" sulfur, colloidal substances: In the formula, R 1 and R 2 are each, divalent hydrocarbon radical; R 3 is a hydrocarbon group of a single bond the divalent; X is a hydrogen atom or a carboxyl group; when R 3 is a hydrocarbon group, x and y are each, Number of 1 to 4; when R 3 is a single bond, the sum of (x + y) is a number of 1 to 4. [Effect] In addition to the cleaning property, the colloidal substance of the present invention It exhibits high wear and extreme pressure properties, improved thermal stability, and satisfactory corrosion resistance to copper. It is particularly suitable for use in engine oils, gear oils, hydraulic fluids and metalworking oils. |