Fluorescent dyes for paper dyeing

摘要

The present invention relates to an aqueous preparation comprising a fluorescent dyestuff of a specific formula, water, and optionally a dispersing agent, and the use of the aqueous preparation for dyeing cellulose- or polyamide-containing materials.

主权项

1. An aqueous preparation comprising: a compound of formula (1), water, and optionally, a dispersing agent, wherein
R1 represents hydrogen, CN, CF3, Br, Cl, I, optionally substituted aryl, or optionally substituted alkyl;R2 and R3, independently of each other, represent hydrogen, C1-5-alkyl, C1-5-alkoxyl, optionally substituted aryl, optionally substituted phenyl, p-C1-5-alkoxyphenyl, a di(C1-5-alkyl)amino group, or —SO3M, wherein M is mono- , di- , tri- or tetra-substituted ammonium substituted by C1-5-alkyl and/or C1-5-hydroxyalkyl;
R2 and R3 are attached to the aromatic ring at any position, wherein at least one of R2 or R3 is —SO3M; andk and m are, independently of each other, an integer from 1 to 3.