IMPROVED OPTICAL BLEACHING COMPOSITIONS Russian patent published in 2013 - IPC D21H17/66 D21H21/16 D21H21/30 C07D251/54 C07D403/12 

FIELD: chemistry.

SUBSTANCE: invention relates to a compound of formula (1) where R₁ denotes hydrogen or $${\text{SO}}_{\text{3}}^{-}$$ , R₂ denotes hydrogen or $${\text{SO}}_{\text{3}}^{-}$$ , R₃ denotes hydrogen or $${\text{CH}}_{\text{2}}{\text{CO}}_{\text{2}}^{-}$$ , R₄ denotes $${\text{CH}}_{\text{2}}{\text{CO}}_{\text{2}}^{-}$$ , $$CH\left(C{O}_2^{-}\right)C{H}_{2}C{O}_2^{-}$$ or $$CH\left(C{O}_2^{-}\right)C{H}_{2}C{H}_{2}C{O}_2^{-}$$ , and where M denotes a stoichiometric cation equivalent required to balance the anionic charge in formula (1) and is a combination of Mg²⁺ with at least 1 additional cation. The additional cations are selected from a group consisting of H⁺, a cation of an alkali metal, a cation of an alkali-earth metal other than Mg²⁺, ammonium, mono-C₁-C₄ alkyl-di-C₂-C₃-hydroxyalkylammonium, di-C₁-C₄-alkyl-mono-C₂-C₃-hydroxyalkylammonium, ammonium, which is mono-, di- or trisubstituted with a C₂-C₃ hydroxyalkyl radical, and mixtures thereof. The invention also relates to versions of the method of producing said compound and use of said compound in binding compositions for bleaching paper.

EFFECT: compound is a more efficient paper bleaching agent.

8 cl, 4 tbl, 10 ex