Preparation of cationic azo or hydrazone dyes in which the alkyl

Details Preparation of cationic azo or hydrazone dyes in which the alkyl Preparation of cationic azo or hydrazone dyes in which the alkyl

1987-12-07

1990-05-15

Higel, Floyd D.

Organic compounds -- part of the class 532-570 series

Organic compounds

Azo

534579, 534607, 534611, 548477, 564251, C09B 4300, C09B 4410, C09B 6734, C09B 6902

Patent

active

049259261

ABSTRACT:
The invention relates to a continuous process for the preparation of cationic azo or hydrazone dyes from heterocyclic diazo components and coupling components. The diazo component is diazotised in water and an acid, the diazo solution is coupled with the coupling component and continuously alkylated, preferably using sufficient acid that, after the alkylation, a two-phase system forms, consisting of an aqueous solution which is substantially free from dye and a highly concentrated oil phase or solid dye.

REFERENCES:
patent: 4376728 (1983-03-01), Raue et al.
patent: 4392998 (1983-07-01), Kuhlthau
patent: 4638053 (1987-01-01), Neeb et al.

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