METHOD FOR PREPARING OPTICAL BLEACHERS, DERIVED FROM 4,4'-BIS- (2 ', 4' -DIAMINO-S-TRIAZINYL (6 ') AMINO) STILBONE-2,2'-DISULPHONIC ACID, METHOD FOR OPTICAL BLEACHING, OBJECTS OBTAINED USING THIS METHOD AND METHOD FOR PREPARING CONCENTRATED LIQUID PREPARATIONS.

摘要

Disclosed are stilbene compounds of formula I, in which R1 signifies hydrogen, halogen or C1-6 alkyl, R2 signifies hydrogen or methyl, R3 signifies cyano or a radical -CONR7R8 in which either R7 and R8, independently, each signifies hydrogen, C1-6alkyl or C2-6hydroxyalkyl, or R7 and R8, together with the nitrogen atom, signify a pyrrolidine, piperidine or morpholine radical, EITHER R4 and R5, independently, each signifies C1-6alkyl or C 2-6hydroxyalkyl, or R4 and R5, together with the nitrogen atom, form a radical (a) CH2-CH2 -N ANGLE ANGLE X (a) CH2-CH2 in which -X- signifies -CH2-, -O-, -S-, a direct bond, or -NR9-, in which R9 signifies C 1-6alkyl or C2-6hydroxy-alkyl, R6 signifies hydrogen or C1-6alkyl, unsubstituted or substituted by hydroxy, cyano or aminocarbonyl, M signifies hydrogen or a non-chromophoric cation, A- signifies a non-chromophoric anion M SIGNIFIES 2 OR 3, AND N SIGNIFIES 0 OR 1, THE -SO3M group, shown floating, being bound to the 4- or 5-position of the benzene ring and, when n signifies 1, R6 being bound either to the nitrogen or, when NR4R5 signifies a thiomorpholino ring, to the nitrogen or to the sulphur thereof or, when NR4R5 signifies a piperazine ring, to one or other of the nitrogens thereof, their production and use as optical brighteners on cellulosics, particularly on cotton and paper.