Patent ID: 7279121

Claim:
A process for producing a microcapsule, which comprises dispersing a liquid organic dispersion in an aqueous medium to form a capsule particle in the aqueous medium, the liquid organic dispersion containing an acid group-containing resin having an acid value of 20 to 400 mgKOH/g in the free acid form, a colored particle and an organic solvent, and the capsule particle comprising a disperse system containing the liquid organic dispersion, and a wall encapsulating the disperse system, wherein the acid group of the resin has been at least partly neutralized with an alkanolamine represented by the following formula (1): wherein R 1 and R 2 are the same or different and each represents a hydrogen atom or a hydrocarbon group which may have a hydroxyl group as a substituent; R 1 and R 2 may bond to each other to form a nitrogen-containing ring together with the adjacent nitrogen atom; and R 3 represents a C 2-6 branched alkylene group, wherein the disperse system comprises an electrically insulating dielectric fluid, and a single kind or plural kinds of colored particle(s) dispersed in the dielectric fluid and the colored particle is charged in the electrically insulating dielectric fluid and movable electrophoretically in the microcapsule by a potential difference, and the wall comprises the resin; which the process further comprises crosslinking or curing the resin constituting the wall with the use of the acid group of the resin.