Liquid phenolic sulphur-containing antioxidants
US7026438B2 · kind B2 · utility
5Cited by
3References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 26, 2003 |
| Grant date | Apr 11, 2006 |
| Priority date | — |
| Expiry date | Nov 26, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/255
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention relates to liquid sulphur-containing antioxidants and to compositions comprising them. The novel lubricant compositions comprise the reaction product of a selected group of 5-tert-butyl-4-hydroxy-3-methyl(or tert-butyl)phenyl substituted carboxylic acid esters with thiodiethylene glycol and a mono-hydroxy alcohol with a carbon chain length higher than 4 C-atoms. The novel lubricant compositions are highly resistant to oxidative degradation and are capable of reducing the negative effects of deposits, such as black sludge, in motor combustion engines, particularly spark ignition internal combustion engines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.