OPTICAL BLEACHING AGENT SOLUTIONS STABLE DURING STORAGE Russian patent published in 2011 - IPC C07D251/68 D06L3/12 

FIELD: chemistry.

SUBSTANCE: invention relates to solutions of optical bleaching agents which are stable during storage, based on defined salt forms of aniline-substituted bis-triazinyl derivatives of 4,4'-diaminostilbene-2,2'-disulphonic acid of formula where R denotes a hydrogen atom, R₁ denotes a β-hydroxyalkyl radical having 2-4 carbon atoms, R₂ denotes a hydrogen atom, M⁺ denotes Na⁺, n is less than or equal to 1.5; which do not require additional dissolution promoting additives.

EFFECT: high stability of the compounds during storage.

14 cl, 2 tbl, 6 ex