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liquid developer

A developer and liquid technology, applied in the directions of developer, instrument, optics, etc., can solve problems such as poor compatibility, low possibility of acid radical reaction, and inability to obtain particle size distribution colored resin particles.

Active Publication Date: 2019-09-03
SAKATA INX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the toner particles have a small particle size, there is a problem that the aggregation between the particles is likely to occur, which causes coarsening, etc., and the dispersion stability of the obtained liquid developer and the aesthetics of the printed matter become insufficient.
[0013] However, this method has problems in that the uniformity of the particle diameter is insufficient, which causes the difference in electrophoretic properties, and the dispersion stability over time is also insufficient.
[0015] By this method, the uniformity of the particle size and the dispersion stability over time are improved, but since the compound having a carbodiimide group used here is used as a pigment dispersant, it is adsorbed on the surface of the pigment, and it is not compatible with the resin particles. Low probability of acid radical reaction on the surface
[0016] Moreover, due to the poor compatibility between the main binder resin and the resin containing acid radicals, it will also be found that the precipitation of the resin cannot be carried out stably on the surface of the colorant, and the phenomenon that the colored resin particles with a wide and uniform particle size distribution cannot be obtained. In addition, it has also been found that when there are a large number of residual acidic groups that do not interact with basic groups, the phenomenon of particle formation (granulation) decreases. In recent years, in order to further improve the quality of printed matter , is required to further improve the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0134] (Embodiment 1) Use granulation aid 1

[0135] Mix 20.00 parts of pigment (Carmine 6B), 4.00 parts of PB-821 as a pigment dispersant containing basic groups, and 76 parts of methyl ethyl ketone, and knead with a paint vibrator for 15 minutes using a steel ball with a diameter of 5 mm Thereafter, using zirconia beads having a diameter of 0.05 mm, it was further kneaded for 2 hours with an Eiger Motor Mill M-250 (manufactured by Eiger Japan). Add 23.49 parts of polyester resins as acid radical-containing resins in 29.00 parts of this kneading thing, 3.00 parts of styrene-acrylate copolymer resins as acid radical-containing resins, 4.8755 parts of granulation aid 1 (solid content 40% ), 88.000 parts of methyl ethyl ketone, heated and stirred at 50°C.

[0136] Then, after adding and stirring 1.0 parts of particle dispersant PB817, it stirred while diluting with 63.597 parts of IP Solvent 2028 which is an insulating solvent, and obtained a liquid mixture. Then, using a devi...

Embodiment 2

[0137] (Embodiment 2) use granulation aid 2

[0138] Mix 20.00 parts of pigment (Carmine 6B), 4.00 parts of PB-821 as a pigment dispersant containing basic groups, and 76 parts of methyl ethyl ketone, and knead with a paint vibrator for 15 minutes using a steel ball with a diameter of 5 mm Thereafter, using zirconia beads having a diameter of 0.05 mm, it was further kneaded for 2 hours with an Eiger Motor Mill M-250 (manufactured by Eiger Japan). Add 24.74 parts of polyester resins as acid radical-containing resins in 29.00 parts of this kneading thing, 3.00 parts of styrene-acrylate copolymer resins as acid radical-containing resins, 1.40 parts of granulation aid 2 (solid content 50% ), 88.000 parts of methyl ethyl ketone, heated and stirred at 50°C.

[0139] Then, after adding and stirring 1.0 parts of particle dispersant PB817, it stirred while diluting with 63.597 parts of IP Solvent 2028 which is an insulating solvent, and obtained a liquid mixture. Then, using a device...

Embodiment 3

[0140] (Embodiment 3) Use granulation aid 3

[0141] Mix 20.00 parts of pigment (Carmine 6B), 4.00 parts of PB-821 as a pigment dispersant containing basic groups, and 76 parts of methyl ethyl ketone, and knead with a paint vibrator for 15 minutes using a steel ball with a diameter of 5 mm Thereafter, using zirconia beads having a diameter of 0.05 mm, it was further kneaded for 2 hours with an Eiger Motor Mill M-250 (manufactured by Eiger Japan). In 29.00 parts of this kneading thing, add 22.54 parts of polyester resins as acid radical-containing resins, 3.00 parts of styrene-acrylate copolymer resins as acid radical-containing resins, 7.25 parts of granulation aid 3 (solid content 40% ), 88.000 parts of methyl ethyl ketone, heated and stirred at 50°C.

[0142] Then, after adding and stirring 1.0 parts of particle dispersant PB817, it stirred while diluting with 63.597 parts of IP Solvent 2028 which is an insulating solvent, and obtained a liquid mixture. Then, using a devic...

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Abstract

The present invention aims to provide a liquid developer for electrophotography or electrostatic recording, which is good in particle uniformity, storage stability, fixability, and electrophoretic property. As a solution, in order to provide the following liquid developer: the particle dispersant is used to disperse colored resin particles in an insulating solvent, and the colored resin particles are made of at least a pigment and an acid group-containing resin in an insulating solvent by using an aggregation method. A binder resin, a basic group-containing pigment dispersant, and a granulation aid to granulate colored resin particles. Here, as the granulation aid, at least one carbodiimide The number of active hydrogen in the carbodiimide compound of the acid group-containing resin: the number of carbodiimide groups in the carbodiimide compound=1: 0.01 or more and less than 1.00.

Description

technical field [0001] The present invention relates to a liquid developer for electrophotography or electrostatic recording used in printing machines, copiers, printers, facsimile machines and the like. Background technique [0002] The electrophotographic method is a method of forming colored images, which is characterized in that an electrostatic latent image is formed on the surface of a photoreceptor, and a developer composed of colored resin particles (generally called a colorant) Powder) is attached to develop, and then the developer is transferred to the printing substrate and fixed by heat or pressure. The outline is as follows. [0003] First, the entire surface of the photoreceptor having the characteristic of being an insulator in a dark place and a conductor in a bright place is charged in a dark place. Then, according to the printed image, by irradiating light (conducting) to the part corresponding to the non-image part (or image part) of the photoreceptor, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/13
CPCG03G9/135G03G9/1355G03G9/131G03G9/132G03G9/087G03G9/0906G03G9/125G03G9/13
Inventor 岩濑孝司冈本胜利柴田英雄前田宽仁井上智晶
Owner SAKATA INX