Process for the preparation of new crystal modification of an az

Details Process for the preparation of new crystal modification of an az Process for the preparation of new crystal modification of an az

1988-12-12

1990-05-01

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Dry dye composition other than mere mixture of two or more...

Dye in specified form other than mere powder

8662, 8695, 8922, 8924, 534575, C09B 2920, C09B 6710, D06P 118

Patent

active

049215051

ABSTRACT:
In the process for the preparation of the dyestuff of the formula I ##STR1## by diazotization and coupling, the aqueous suspension present when the coupling has ended is heated to temperatures of 50.degree. C. up to the boiling point of the aqueous phase in the presence of a dispersing agent.

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patent: 4319880 (1982-03-01), Opitz et al.
patent: 4327999 (1982-05-01), Koller et al.
patent: 4329144 (1982-05-01), Eugster et al.
patent: 4332588 (1982-07-01), Eugster et al.
patent: 4374640 (1983-02-01), Tappe et al.
patent: 4460375 (1984-07-01), Sommer et al.
patent: 4722737 (1988-02-01), Brandt et al.

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