To obtain a yellow monoazo pyridone dye mixture which can dye well even under severe conditions at a high temp.
This dye mixture comprises a monoazo dye represented by the formula [I] wherein R is H and a monoazo dye represented by the same formula wherein R is Cl in a wt. ratio of (1:1)-(1:4), has a crystal modification characterized by an X-ray diffraction diagram (CuKα) having a strong peak at a diffraction angle (2θ) of 9.0°, medium peaks at diffraction angles of 7.4°, 10.1°, and 23.8° and weak peaks at diffraction angles of 6.2° and 15.1°C, and is produced by diazotizing a mixture of 2-nitroaniline and 4-chloro-2-nitroaniline in a wt.ratio of (1:1)-(1-4) and coupling the resultant diazo compd. with 1-(2- ethylhexyl)-3-cyano-6-hydroxy-4-methylpyrrolidone.
HIBARA TOSHIO
TAKAHASHI YOSUKE
Next Patent: PRODUCTION OF CATIONIC AZO TRIAZOLE DYE