Lubricants with 5-tert.-butyl-4-hydroxy-3-methylphenyl substituted fatty acid esters
US6750184B2 · kind B2 · utility
6Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2001 |
| Grant date | Jun 15, 2004 |
| Priority date | — |
| Expiry date | Sep 19, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2030/10
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to improved lubricant compositions highly resistant to oxidative degradation comprising selected 5-tert.-butyl-4hydroxy-3-methylphenyl substituted fatty acid esters, diphenylamines and zinc dithiophosphates. The compositions as defined above are characterized by superior antioxidative properties. This can be demonstrated in various standard tests such as Deposit and Oxidation Panel Test (DOPT) and Pressurized Differential Scanning Calorimetry (PDSC).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.