| abstract |
The present invention relates to a compound of formula (I) wherein R1 and R3 are each independently of the other -NHR5, NHSO2R5, -NHCOR5, -0R6 or -SR7, R2 and R4 are each independently of the other -OR6 or -SR7, with the proviso that not all of the substituents R1 to R4 are -SR7, R5 is hydrogen, alkyl, aryl, aralkyl or a group of formula -(CnH2nX)m-H wherein X is -O-, -S-, -SO2-, -NH-, -NR8-, -CONH- or -CONR8- and R8 is alkyl or aryl, n is a number from 2 to 6 and m is a number from 1 to 10, R6 is aryl or heteroaryl and R7 is alkyl, aryl, heteroaryl or a group of formula -(CnH2nX)m-H wherein X is -O-, -S-, -SO2-, -NH-, NR8-, COHN- or -CONR8- and R8 is alkyl or aryl, to a process for the preparation thereof and to the use thereof in a method of producing mass-coloured plastics or polymeric colour particles. |