Detergent-dispersant additives based on salts of alkaline-earth and alkali metals for lubricating oils
US5030687A · kind A · utility
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8Claims
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Key dates
| Filing date | Sep 20, 1988 |
| Grant date | Jul 9, 1991 |
| Priority date | — |
| Expiry date | Sep 20, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M159/22
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Alkylsalicylate-containing detergent-dispersant additives for lubricating oils are obtained by (a) neutralizing an alkylphenol by means of an alkali metal hydroxide; (b) carboxylation of the product with carbon dioxide for maximum conversion of the initial alkali metal alkylphenate into alkali metal alkylsalicylate; (c) sulfurization-superalkalinization of the product in the presence of an alkaline earth base followed by carbonation of the product with carbon dioxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.