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AssigneeHoechst Aktiengesellschaft
InventorsHasso Hertel, Klaus Hunger, Heinrich Frolich
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Using the method of azoic dyeing, fast blue dyeings are obtained when the bis-diazotable diazo component used is a compound of the general formula (1) ##STR1## in which R is a straight-chain or branched alkyl group of 3 to 5 carbon atoms or a (C.sub.1 -C.sub.3)-alkoxy-(C.sub.2 -C.sub.4)-alkyl group having straight-chain and/or branched alkyl groups of in total 3 to 5 carbon atoms, and the coupling component used is a compound conforming to the general formula (2) ##STR2## in which Z stands for a hydrogen atom or a halogen atom or an alkoxy group of 1 to 4 carbon atoms and Aryl denotes a phenyl radical or a 1-naphthyl radical which can be substituted by 1, 2 or 3 substituents from the group consisting of halogen, nitro, alkyl of 1 to 4 carbon atoms and alkoxy of 1 to 4 carbon atoms, and the coupling reaction and dye formation on the fiber are carried out at a pH value between 4 and 10.
A process for preparing a water-insoluble disazo dye on a fiber, according to an azoic dyeing method, by bringing the fiber material, after its impregnation with a coupling component, into contact with the diazonium compound of an aromatic diamine in aqueous medium and coupling that bis-diazonium compound with the coupling component, which process comprises using as a bis-diazotizable diazo component a compound of the formula ##STR5## in which R is a straight-chain or branched alkyl of 3 to 5 carbon atoms or a (C.sub.1 -C.sub.3)-alkoxy-(C.sub.2 -C.sub.4)-alkyl having straight-chain and/or branched alkyls of in total 3 to 5 carbon atoms, and as the coupling component a compound of the formula ##STR6## in which Z is hydrogen, halogen or alkoxy of 1 to 4 carbon atoms, and aryl is phenyl or 1-naphthyl, or phenyl or 1-naphthyl substituted by 1, 2 or 3 substituents selected from the group consisting of halogen, nitro, alkyl of 1 to 4 carbon atoms and alkoxy of 1 to 4 carbon atoms, and carrying out the coupling reaction and dye formation on the fiber at a pH of between 4 and 10.
In a process for coloring a fiber material, accrding to an azoic dyeing method, wherein the fiber material is impregnated with a coupling component corresponding to the formula ##STR7## in which Z is hydrogen, halogen or alkoxy of 1 to 4 carbon atoms, and aryl is phenyl or 1-naphthyl, or phenyl or 1-naphthyl substituted by 1, 2 or 3 substituents selected from the group consisting of halogen, nitro, alkyl of 1 to 4 carbon atoms and alkoxy of 1 to 4 carbon atoms, and the impregnated material is brought in contact, in aqueous medium, with the bis-diazonium compound of an aromatic diamine, and the coupling reaction and dye formation on the fiber is carried out at a pH of from 4 to 10, the improvement comprising of employing as the bis-diazonium compound that of a diamino-biphenyl compound of the formula ##STR8## in which R is a straight-chain or branched alkyl of 3 to 5 carbon atoms or a (C.sub.1 -C.sub.3)-alkoxy-(C.sub.2 -C.sub.4)-alkyl having straight-chain and/or branched alkyls of in total 3 to 5 carbon atoms.
Dependencies are inferred from the claim text.