Crystal formation inhibition in lubricating compositions
US6825154B1 · kind B1 · utility
1Cited by
5References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 22, 2002 |
| Grant date | Nov 30, 2004 |
| Priority date | — |
| Expiry date | Jul 22, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2030/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Lubricating oil formulations comprising base oil, sulfur-phosphorous anti-wear/extreme pressure agents and hindered phenol antioxidants which anti-wear/extreme-pressure agents and hindered phenolic antioxidants are prone to crystal formation wherein the base oil is characterized as having a saturates content of less than 99% are stabilized against crystal formation by the addition of a minor amount of a high molecular weight di- or polycarboxylic acid anhydride, or mixture thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.