Tetrahydroquinolines as antioxidants for lubricants
US4692258A · kind A · utility
28Cited by
8References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1985 |
| Grant date | Sep 8, 1987 |
| Priority date | — |
| Expiry date | Dec 18, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2050/10
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Lubricants can be rendered more resistant to oxidation with the aid of compounds of the formula I ##STR1## wherein R.sub.1 and R.sub.2 are independently hydrogen, alkyl or benzyl, R'.sub.2 is hydrogen or alkyl, R.sub.3 and R.sub.4 are independently alkyl, phenyl or benzyl, R.sub.5 is hydrogen or alkyl, and R.sub.6 is alkyl. In a preferred embodiment, these compounds are combined with a customary phenolic antioxidant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.