Patent ID: 6143039
Filing Date: 2000-11-07
Classification: C09B,D06P,Y10S

Abstract:
Dye mixture comprising one or more copper complex formazan dyes conforming to the formula (1) ##STR9## wherein R.sub.1 denotes hydrogen;Y.sub.1 denotes vinyl or ethyl which is substituted in the .beta.-position by a substituent can be eliminated by the action of an alkali, forming the vinyl group; andM denotes hydrogen or an alkali metal;and one or more copper complex formazan dyes conforming to the formula (2) ##STR10## wherein R.sub.2 denotes hydrogen;Y.sub.2 denotes vinyl or ethyl which is substituted in the .beta.-position by a substituent which can be eliminated by the action of an alkali, forming the vinyl group; andM denotes hydrogen or an alkali metal.