Surbased colloidal product containing organic sulfur and their use as detergent additives having an antiwear and extreme-pressure effect in lubricating oils
US5324440A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1993 |
| Grant date | Jun 28, 1994 |
| Priority date | — |
| Expiry date | Mar 25, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M2227/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A description is given of colloidal sulphur products, their preparation and their use as additives in lubricating oils. These products result from the reaction on a superbasic detergent additive, optionally modified by reaction with a boron derivative, of a "small size" sulphur carboxylic acid complying with the general formula EQU X--R.sup.1 --Sx--R.sup.3 --Sy--R.sup.2 --COOH in which R.sup.1 and R.sup.2 each represent a divalent hydrocarbon radical, R.sup.3 represents a single bond or a divalent hydrocarbon radical, X represents a hydrogen atom or a carboxylic group and x and y are in each case a mean value from 1 to 4 when R.sup.3 is a hydrocarbon radical and the sum x plus y is a mean value from 1 to 4 when R.sup.3 represents a single bond. Apart from their detergent properties, these products have high extreme pressure and antiwear properties, as well as an improved thermal stability and a satisfactory corrosivity with respect to copper. They are particularly suitable for use in engine oils, gear oils, hydraulic fluids and metal working oils.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.