OPTICAL BLEACH FOR PAPER Russian patent published in 2022 - IPC C07D403/12 C07D251/68 D21C9/10 D21H17/09 D21H21/32 

FIELD: chemistry.

SUBSTANCE: invention relates to a compound of the formula (2), in which Z¹ and Z² are, independently of each other, OR⁹ or OR¹⁰, where R⁹ and R¹⁰ are, independently of each other, linear C₁-C₃ alkyl; or Z¹ and Z² are, independently of each other, NR²R³ or NR⁴R⁵, where R² and R⁴ are, independently of each other, hydrogen, linear C₁-C₃ alkyl, linear C₂-C₃ hydroxyalkyl or branched C₃ hydroxyalkyl, CH₂CO₂M, CH₂CH₂CONH₂, R³ and R⁵ are, independently of each other, linear C₂-C₃ alkyl, linear C₂-C₃ hydroxyalkyl or branched C₃ hydroxyalkyl, CH₂CH₂SO₃M, CH₂CO₂M, CH(CO₂M)CH₂CO₂M, R² and R³ and/or R⁴ and R⁵ are, together with a neighboring nitrogen atom, a morpholine ring, and R¹ and R⁶ are hydrogen, R⁷ and R⁸ are, independently of each other, linear C₁-C₄ alkyl, X and Y are SO₃M, m and n are equal to 1, and M is a cation for the balance of an anionic charge, selected from a group including or essentially consisting of an alkali metal cation. The invention also relates to a method for producing a compound of the formula (2) and to a concentrated aqueous composition for optical lightening of fabrics, paper, cardboard and nonwoven materials based on the compound of the formula (2).

EFFECT: new compounds and a composition based on them are obtained, which can be used as an optical bleach for bleaching and lightening paper, cardboard, textiles and nonwoven materials.

16 cl, 4 tbl, 11 ex