| abstract |
The present invention relates to an azo dye of formula I, wherein R1 and R2 are each independently of the other -NH-(CH2CH2)-OH, -NH-CH2-CHOH-CH2-OH, -NH-(CH2CH2)-S-(CH2CH2)-OH, -NH-(CH2CH2)-NH-(CH2CH2)-OH, -NH-(CH2CH2)-NH2, -NH-CH2-CHOH-CH2-NH2, -NH-CH2-CON(CH2CH2OH)2, -NH-CH2CH2-CON(CH2CH2OH)2, R3 is -CN or -CONH2, R4 is methyl or trifluoromethyl, R5 is -CF3, -COOC2H5, R6 is hydrogen or chlorine and R7 is hydrogen, chlorine, bromine or -NO2, to a process for the preparation thereof and to the use thereof in a method of producing mass-coloured plastics or polymeric colour particles. |