Azo dyes, processes for their preparation and the use thereof

Details Azo dyes, processes for their preparation and the use thereof Azo dyes, processes for their preparation and the use thereof

1998-06-17

1999-07-20

Powers, Fiona T.

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

Organic compounds

Azo

534612, 534797, 534637, C09B 6209, D06P 138

Patent

active

059257466

ABSTRACT:
Azo dyes of the formula (1) ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently of one another are each hydrogen or substituted or unsubstituted C.sub.1 -C.sub.4 alkyl,

REFERENCES:
patent: 4323497 (1982-04-01), Hoyer et al.
patent: 4693726 (1987-09-01), Meininger et al.
patent: 5262527 (1993-11-01), Gregory et al.
patent: 5328995 (1994-07-01), Schaulin et al.
patent: 5451251 (1995-09-01), Marfume et al.
patent: 5631352 (1997-05-01), Lauk
patent: 5684138 (1997-11-01), Klier et al.
patent: 5750662 (1998-05-01), Reichert et al.
Kraska et al., Chemical Abstracts, 92:112243 (1980).
K. Venkataraman, The Chemistry of Synthetic Dyes, vol. VI, pp. 1-209, (1972).

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