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Liquid developer

A developer and liquid technology, applied in developer, electrography, optics, etc., can solve the problem of coexistence of migration of substrates that cannot be electrophoretic printing

Inactive Publication Date: 2016-09-14
SAKATA INX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of an insulating solvent, since the viscosity of the former is too high and the viscosity of the latter is too low conversely, it is still not possible to coexist electrophoresis, which is the opposite performance, and good migration to the printing substrate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] As an insulating solvent, IP SOLVENT2028 / IP SOLVENT2385=85 / 15 was used.

[0133] 20.00 parts of pigment (acid carbon black at pH 2.8), 8.00 parts of pigment dispersant (PB821, manufactured by Ajinomoto Fine Chemical Co., Ltd.), and 72.00 parts of methyl ethyl ketone were mixed, and passed through a paint mixer (paint mixer) with a steel ball with a diameter of 5 mm. shaker) for 15 minutes, and further kneaded for 2 hours by Eiger Motormill M-250 (manufactured by Eiger Japan) using zirconia beads with a diameter of 0.05 mm. 25.00 parts of this kneaded product was used as a millbase, and 21.00 parts of an acidic group-containing polyester resin as a binder resin, 5.00 parts of an acidic group-containing resin, and a granulation aid (solid content 50% ) and 96.00 parts of methyl ethyl ketone were heated and stirred at 50°C.

[0134] Then, after adding 1.00 parts of particle dispersants and stirring, it stirred while diluting with 55.25 parts of IP SOLVENT2028 which is an ...

Embodiment 2

[0136] Except having changed IP SOLVENT2835 of an insulating solvent (B) into NAS-5H, it carried out similarly to Example 1, and obtained the liquid developer of Example 2.

Embodiment 3

[0138] Except having changed IP SOLVENT2835 of an insulating solvent (B) into Moresco-White P-40, it carried out similarly to Example 1, and obtained the liquid developer of Example 3.

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Abstract

[Problem] To provide a liquid developer for electrophotography or electrostatic recording, said developer having good electrophoretic properties and good transferability to print base materials. [Solution] Provided is a liquid developer obtained by dispersing colored resin particles in an insulating solvent, said colored resin particles comprising at least a pigment, a pigment dispersant, and a binder resin, and being obtained by coacervation, wherein the insulating solvent is mixed: in such a manner that the ratio of C11-12 aliphatic hydrocarbons is 8.0 to 20.0 mass% with respect to the total amount of the insulating solvent, the ratio of a C17-30 aliphatic hydrocarbon solvent is 2.0 to 45.0 mass%, and the total ratio of the C11-30 aliphatic hydrocarbon solvent is 99 mass% or higher; and in such a manner that the viscosity at 25 DEG C is 2.0 to 10.0 mPa*s.

Description

technical field [0001] The present invention relates to a liquid developer for electrophotographic 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 a colored image characterized by forming an electrostatic latent image on the surface of a photoreceptor, and using the attractive or repulsive force generated by the electrostatic force to make the developer (commonly called toner) composed of colored resin particles ) is attached to develop an image, and the developer is further transferred to the printing substrate and fixed by heat and pressure. The outline is as follows. [0003] First, the entire surface of a photoreceptor is charged in a dark place, and the photoreceptor has a characteristic of being an insulator in a dark place and a conductor in a bright place. Next, according to the printed image, light is irradiated (conducted) t...

Claims

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Application Information

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IPC IPC(8): G03G9/12G03G9/13
CPCG03G9/13G03G9/125G03G9/0802G03G9/087G03G9/131G03G9/135
Inventor 冈本胜利前田宽仁井上智晶渡边有哉
Owner SAKATA INX
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