Diphenylamine alkylated with olefin mixtures containing fractions with varying degrees of activity
US7189875B2 · kind B2 · utility
1Cited by
10References
9Claims
0Family size
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Key dates
| Filing date | Mar 31, 2004 |
| Grant date | Mar 13, 2007 |
| Priority date | — |
| Expiry date | Nov 10, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/25
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed herein is a process for the preparation of alkylated diarylamines comprising adding to said diarylamine an olefin mixture containing highly reactive fractions, as well as fractions exhibiting a relatively lower chemical reactivity, in the presence of an acidic clay catalyst at a temperature low enough to prevent substantial deactivation of the catalyst until the addition is complete and then increasing the temperature to increase the alkylation rate of the less reactive fractions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.