Patent ID: 9156989
Filing Date: 2015-10-13
Classification: C09B,C09D

Abstract:
1. A method for preparing a surface modified organic pigment, the method comprising the steps of: reacting an organic pigment in an aromatic hydrocarbon solvent with a surface modifying reagent to form the surface modified organic pigment; and washing and drying the surface modified organic pigment; wherein the surface modifying reagent is represented by Formula (I): X is selected from the group consisting of O, S, and N—R3; Y is selected from the group consisting of O and NR4; R1 to R4 are each independently selected from the group consisting of hydrogen, an alkyl group, an alkenyl group, an alkynyl group, an aralkyl group, an alkaryl group, and an aryl group and a heteroaryl group; and when Y—R1 is different from OH, at least one of R2 to R4 is substituted by at least one functional group having a pKa between 2.5 and 9.