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US 2009/0123711 A1Published application
Disperse azo dyes and mixtures comprising these disperse azo dyes
OwnerHelmut Sieberinventor
Life of this patent
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Abstract
Dye of the formula (I) where Ra is —C6H5-substituted C1-C4-alkyl, Rb is methoxy or ethoxy Rc is methyl or ethyl, its preparation and also the use of this dye in dye mixtures.
Claims10
A dye of the formula (I)
- wherein
- Ra is —C6H5-substituted C1-C4-alkyl,
- Rb is methoxy or ethoxy
- Rc is methyl or ethyl.
1 more element
A process for preparing a dye of formula (I), comprising the steps of:
- diazotizing an amine of the formula (II) to form a diazotized amine,
- coupling the diazotized amine with a compound of the formula (III)
- wherein
- Ra is —C6H5-substituted C1-C4-alkyl,
- Rb is methoxy or ethoxy
- Rc is methyl or ethyl,
- and subsequently replacing the Br substituent in the diazo component with —CN.
4 more elements
Dependencies are inferred from the claim text.