Method for producing red colored composition for color filter, red coloring composition for color filter, red colored resist composition for color filter, color filter and display device

摘要

Problem to be solved: to provide a method of producing a red coloring composition for a color filter capable of suppressing a sublimation product caused by an organic pigment and obtaining a color filter excellent in contrast and luminance.Diketopyrrolopyrrole pigmentResin andThe diketopyrrolopyrrole compound is subjected to salt milling with the sulfonated substance.Fine particle process to obtain fine pigmentsAndThe above described fine pigmentHaving a kneading process of kneading a mixture containing an azo group and a naphthol skeleton with a sulfonation substanceSaid resinA method for producing a red coloring composition having a maleimide skeleton and a sulfonic acid group for a color filter.No selection