Alkylated 3-hydroxydiphenylamine antioxidants
US10563145B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Sep 13, 2017 |
| Grant date | Feb 18, 2020 |
| Priority date | — |
| Expiry date | Sep 13, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/25
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Certain alkylated 3-hydroxyphenylamine antioxidants wherein one phenyl is substituted by at least one hydroxyl group at the 3-position relative to the amine and the other phenyl is substituted by at least one substituent having 4 or more carbon atoms are surprisingly effective antioxidants, especially in lubricating oils.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.