SUBSTRATE BLEACHING Russian patent published in 2015 - IPC D21C9/10 D21C9/16 C11D3/39 B01J31/18 B01J31/22 

FIELD: chemistry.

SUBSTANCE: invention relates to substrate bleaching. A method of treating a substrate by bringing the substrate into contact with an aqueous medium containing at least 1% water and 1 to 1500 mM hydrogen peroxide to form a medium is described. The aqueous medium contains a transition metal catalyst obtained in advance. The catalyst is a binuclear catalyst based on a transition metal of the type Mn(II)Mn(II), Mn(II)Mn(III), Mn(III)Mn(III), Mn(III)Mn(IV) or Mn(IV)Mn(IV). The ligand of the transition metal catalyst has the formula (I), where Q = , where p = 3, R is independently selected from hydrogen; C₁-C₆-alkyl; wherein one of R is bonded with N from another Q from another ring through an ethylene bridge; R₁, R₂, R₃ and R₄ are independently selected from: H and C₁-C₄-alkyl. The medium has pH in the range of 11 to 13. The concentration of the catalyst is in the range of 0.0001 to 1.5 mcM.

EFFECT: bleaching substrates.

24 cl, 5 tbl