FLUORESCENT DYESTUFFS OF THE STILBENE SERIES, PROCESS FOR THEIR PREPARATION AND THEIR USE IN THE WHITENING OF ORGANIC MATERIALS AND AS LASER DYESTUFFS

摘要

Fluorescent dyestuffs of the formula IMAGE (I) wherein: R1 and R2 independently of one another represent hydrogen, a salt-forming cation, an alkyl radical with 1 to 8 carbon atoms or an aralkyl radical which is optionally substituted by non-chromophoric groups, R2 to R5 independently of one another represent hydrogen, alkyl, trifluoromethyl, alkoxy, aralkoxy, alkenyloxy, halogen or the carboxyl, cyano, alkylsulphonyl, arylsulphonyl, carboxamide or sulphonamide group or a carboxylic acid ester group, m and n independently of one another denote 0, 1 or 2 and the sum of m+n must be at least 2, and o, p, q and r independently of one another represent 0, 1 or 2.