COMPOSITIONS OF DISULPHONIC FLUORESCENT WHITENING AGENTS Russian patent published in 2015 - IPC D21H21/30 C07D251/68 C07D251/00 

FIELD: chemistry.

SUBSTANCE: invention relates to compositions for optic whitening of paper or cardboard. Composition includes at least two fluorescent whitening agents - derivatives of disulphonic bis-triazinylaminostilbenes, containing group -CO₂M in aniline rings in para and/or ortho-position to aminogroup, where M is hydrogen, Li, Na, K, Ca, Mg, ammonium or ammonium, which is mono-, di-, tri- or tetra-substituted C₁-C₄-alkyl or C₂-C₄-hydroxyalkyl. Described is method of preparing said composition, its application, method of paper whitening and paper resulting from said process.

EFFECT: claimed composition possesses higher whitening ability in comparison with each of separate whitening agents and provides stable concentrated water compositions without addition of auxiliary solubility-improving substances.

25 cl, 1 dwg, 1 tbl, 4 ex