| 摘要 |
A liquid developer for electrophotography or electrostatic recording includes colored resin particles, which are constituted by at least a pigment, a binder resin containing acid group-containing resin, a basic group-containing pigment dispersion agent, and a granulating aid, with the colored resin particles formed in an insulating solvent by utilizing the coacervation method. A carbodiimide compound having at least one carbodiimide group is used as the granulating aid, with the ratio of the number of active hydrogens in the acid group-containing resin to the number of carbodiimide groups in the carbodiimide compound adjusted to 1:0.01 or more but less than 1:1.00, and the colored resin particles are dispersed in the insulating solvent by a particle dispersion agent. The liquid developer has good uniformity, preservation stability, fixing property, and electrophoretic migration property of particles. |
| 主权项 |
1. A liquid developer whose colored resin particles are constituted by at least a pigment, a binder resin containing acid group-containing resin, a basic group-containing pigment dispersion agent, and a granulating aid, with the colored resin particles formed in an insulating solvent by utilizing a coacervation method, wherein a carbodiimide compound having at least one carbodiimide group is used as the granulating aid, with a ratio of a number of active hydrogens in the acid group-containing resin to a number of carbodiimide groups in the carbodiimide compound adjusted to 1:(0.01 or more but less than 1.00), and the colored resin particles are dispersed in the insulating solvent by means of a particle dispersion agent. |
