Gunther Lamm, Karl H Etzbach, Matthias Wiesenfeldt, Guenter Hansen, Helmut Reichelt: Azo dyes whose diazo and coupling components stem from the thiazole series. BASF Aktiengesellschaft, Oblon Spivak McClelland Maier & Neustadt, October 22, 1991: US05059684 (2 worldwide citation)

Thiazole-azo dyes of the formula ##STR1## where R.sup.1 is C.sub.1 -C.sub.12 -alkyl, which may be interrupted by oxygen atoms, phenyl, halogen, cyano or C.sub.1 -C.sub.4 -alkoxycarbonyl,