Patent ID: 9034555
Filing Date: 2015-05-19
Classification: G03G

Abstract:
1. A method for producing a liquid developer comprising toner particles comprising a resin comprising a polyester and a pigment, and an insulating liquid, wherein the toner particles are dispersed in the insulating liquid, comprising: step 1: melt-kneading the resin and the pigment, and pulverizing a melt-kneaded mixture to provide toner particles; step 2: dispersing the toner particles obtained in the step 1 in the insulating liquid in the presence of a basic dispersant to provide a dispersion of toner particles; and step 3: wet-milling the dispersion of toner particles obtained in the step 2 to provide a liquid developer, wherein the basic dispersant is an amide compound obtained by a reaction between a polyethyleneimine and a polyester (D) obtained by self-condensation of 12-hydroxystearic acid, wherein the polyethyleneimine has a number-average molecular weight of 1,000 or more and 2,600 or less, the polyester (D) has a number-average molecular weight of 1,000 or more and 2,500 or less, a molar ratio of the polyethyleneimine to the polyester (D), i.e. the polyethyleneimine/the polyester (D), is from 1/1 to 1/5, and the amide compound has a weight-average molecular weight of 2,000 or more and 7,500 or less.