METHOD FOR PREPARING LIQUID COMPOSITION CONTAINING STILBENE COMPOUNDS Russian patent published in 2004 - IPC

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention describes a method for preparing liquid composition containing stilbene compound of the general formula (I):

wherein R₁ means phenylamine, -N-(C₂-C₄-hydroxyalkyl)₂ or amino acid residue without hydrogen atom in amino-group; R₃ means phenylamino-group substituted possibly with -COR wherein R means (C₁-C₃)-alkyl or NH-(C₁-C₄)-alkyl; M means Na. Method involves interaction of cyanuric acid chloroanhydride with 4,4'-diaminostilben-2,2'-disulfoacid disodium salt and successive substitution of chlorine atoms for residues R₁ and R₃. The process is carried out in aqueous and polyglycol medium in the mass ratio of the latter from 10:90 to 90:10 in presence of sodium carbonate at the 1-st stage of the process. This method provides simplifying the process, reducing formation of by-side products and preparing the stable composition of fluorescent whitening agent for different applications for paper, textile, detergents and cosmetics.

EFFECT: improved preparing method.

8 cl, 5 ex