Preparation of magnesium alkylphenates and their use as detergent-dispersant additives for lubricating oils
US4382004A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 3, 1981 |
| Grant date | May 3, 1983 |
| Priority date | — |
| Expiry date | Aug 3, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M159/22
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method of preparing magnesium alkylphenates comprising: PA0 1. preparing a suspension of "active" magnesium oxide in methanol; PA0 2. contacting said suspension with a mixture containing PA1 (a) an alkylphenol bearing one or more C.sub.6 -C.sub.60 alkyl substituents; PA1 (b) a dilution oil; PA1 (c) and optionally a heavy alcohol of a boiling point of between 100.degree. and 200.degree. C., the ratio of number of mols of "active" magnesium oxide to number of recurrent phenolic OH units being between about 0.25 and 2; and PA0 3. carbonating the resultant medium under pressure with carbon dioxide. The magnesium alkylphenates thus obtained are suitable detergent-dispersant additives for lubricating oils in amounts of between about 1 and 8 percent of the weight of the oils.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.