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

FIELD: chemistry.

SUBSTANCE: invention includes (a) at least one optical bleaching agent of formula (1) , wherein R₁ denotes hydrogen or SO₃M, R₂ denotes hydrogen or SO₃M, R₃ denotes hydrogen or CH₂CO₂M, R₄ denotes CH₂CO₂M, CH(CO₂M)CH₂CO₂M or CH(CO₂M)CH₂CH2CO₂M, where M denotes hydrogen, a cation of an alkali metal, ammonia, mono-methyl-di-C₂-C₃-hydroxyalkylammonium, dimethyl-mono-C₂-C₃- hydroxyalkylammonium, ammonium, which is mono-, di- or trisubstituted with a C₂-C₃ hydroxyalkyl radical, or a mixture of said compounds, (b) a magnesium salt or (c) binder, which is selected from a group consisting of natural starch, enzyme-modified starch, and chemically modified starch, wherein there are 0.1-15 parts of component (b) for one part of component (a). The invention also relates to a method of bleaching paper using said composition.

EFFECT: composition is a more efficient means of achieving high paper whiteness.

9 cl, 4 ex, 3 tbl