Detergent-dispersants of high alkalinity for lubricating oils and process for their preparation
US4251379A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 26, 1979 |
| Grant date | Feb 17, 1981 |
| Priority date | — |
| Expiry date | Jan 26, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M159/24
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
New detergent-dispersants of high alkalinity useful as additives for lubricating oils and a novel process for their preparation are provided. The novel detergent-dispersant additives are prepared by: PA1 (1) sulfurizing an alkylphenol in the presence of an alkylbenzene sulfonate of low or zero T.B.N., an alkaline earth base and an alkylene glycol; PA1 (2) precarbonating the mixture thus obtained; PA1 (3) super-alkalinizing and carbonating the resultant precarbonated mixture by means of an alkaline earth base, CO.sub.2, and an alkylene glycol; and PA1 (4) eliminating the excess alkylene glycol. These detergent-dispersant additives improve the detergent-dispersant power of lubricating oils.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.