BLACK PIGMENT DISPERSION Russian patent published in 2015 - IPC C09B7/08 C07D405/14 C08F8/12 C08F8/46 C09B57/00 C09D7/00 C08F8/14 

FIELD: chemistry.

SUBSTANCE: invention refers to pigment dispersion that can find application in electrophoretic displays. The dispersion contains α) a bis-(oxodihydroindolilene)benzodifuranone colouring agent of formula I wherein R¹-R¹⁰ have values specified in cl.1, β) a special polymer dispersing agent containing modified poly(meth)acrylates, and γ) a solvent applicable for dispersions used in the electrophoretic displays. There are also described new colouring agents of bis-(oxodihydroindolilene)benzodifuranone compounds, dispersing agents and the electrophoretic display comprising these agents.

EFFECT: presented colouring agents have low conductivity and using them as black pigments in the electrophoretic displays enables reducing energy consumption as compared to using state-of-art carbon black.

11 cl, 1 dwg, 1 tbl, 11 ex