Liquid developer for developing latent electrostatic image and method for preparing the same
AssigneeSamsung Electronics Co., Ltd.
InventorsSeong-joon Chae, Kyung-yol Yon, Joong-hwan Choi, Jeong-hun Pang
Life of this patent
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Abstract
A liquid developer for high-quality image reproduction and a method of preparing the liquid developer. The liquid developer exhibits good pigment dispersion by the introduction of organosol. The liquid developer contains fine toner particles of a uniform size with a volume-average to number-average particle diameter ratio of 1.5-2.5, and thus can produce high-resolution images. The liquid developer preparation method is environmentally friendly, simple, and cost effective because no cosolvent is used, thus eliminating the need for a cosolvent removal process.
Claims18
A liquid developer comprising:
- a mixture of an organosol, a pigment, a charge control agent, and a hydrocarbon solvent, the mixture having a volume-average to number-average particle diameter ratio of 1.5-2.5.
A method of preparing a liquid developer, the method comprising:
- synthesizing an organosol using ethymethacrylate (EMA) for a core and lauryl methacrylate (LMA) for a shell;
- mixing the organosol with a pigment in a mass ratio of 1:4-1:10;
- adding a charge control agent to the organosol/pigment mixture until a mass ratio of the charge control agent to the pigment is between 1:0.055 and 1:0.025;
- mixing the charge control mixture with a hydrocarbon solvent while adjusting a solid percentage in a resulting dispersion;
- and
- milling the dispersion while monitoring a ratio of a volume-average particle diameter of the dispersion to a number-average particle diameter of the dispersion is in the range of 1.5-2.5.
Dependencies are inferred from the claim text.