Patent ID: 8319916
Filing Date: 2012-11-27
Classification: B82Y,C09B,G02B

Abstract:
1. A method of producing organic nanoparticles, for use in production of a color filter in a liquid crystal device, comprising dissolving an organic pigment material into a good solvent to form a solution, mixing the solution with a poor solvent for the organic pigment, the poor solvent being compatible with the good solvent, but is the poor solvent for the organic pigment, preparing a dispersion in which the organic pigment is being formed into organic fine particles of a size in the order of nanometer; wherein A represents a component capable of forming an azo dye together with X-Y; X represents a single bond, or a group selected from divalent connecting groups represented by structural formulae of formulae (i) to (v) set forth below; and Y represents a group represented by the following formula (D2); wherein Z represents a lower alkylene group; —NR wherein the dispersing agent is added to at least one of the solution of an organic pigment and the poor solvent, and wherein, in the preparation of the organic fine particles in the dispersion, the organic pigment solution and the poor solvent are mixed with each other, allowing formation of the organic fine particles, and the organic fine particles are concentrated and thereafter added with the polymer compound, to give a concentrated liquid of the organic fine particles, wherein the organic pigment particles form flocks in the concentrated liquid, after the concentration step, that are aggregated to a degree capable of re-dispersion.