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Liquid developer and image forming apparatus

A developer and liquid technology, applied in the direction of developer, electric recording process using charge pattern, equipment for electric recording process using charge pattern, etc., can solve the problem of toner uniformity, particle agglomeration, and difficulty in forming resolution Eliminates problems such as toner images, and achieves excellent dispersion stability and excellent fixing characteristics

Inactive Publication Date: 2012-05-30
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The method of using dry toner uses toner in a solid state. Therefore, although it is convenient to use, the powder may have a bad influence on the human body. There are also problems in the uniformity of toner
In addition, dry toners have the following problems: it is easy to cause aggregation of particles, it is difficult to sufficiently reduce the size of toner particles, and it is difficult to form a toner image with high resolution.
[0007] However, although the liquid developer using the above-mentioned oil and fat improves the fixing strength, it still cannot obtain sufficient fixing strength.

Method used

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  • Liquid developer and image forming apparatus

Examples

Experimental program
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Effect test

preparation example Construction

[0121] [Preparation of associated particles]

[0122] First, an example of a method for producing associated particles in which resin fine particles mainly composed of polyester resin are associated will be described.

[0123] Any method can be used to prepare the associated particles, but in this embodiment, a dispersoid (fine particles) mainly composed of a polyester resin (toner constituent material) is dispersed in an aqueous dispersant composed of an aqueous liquid to obtain a The resulting water-based emulsion is obtained, and the dispersoids in the water-based emulsion are associated to obtain associated particles.

[0124] (water emulsion)

[0125] First, the aqueous emulsion used in this embodiment will be described.

[0126] The aqueous emulsion obtained through the aqueous emulsion preparation process described later has a configuration in which dispersoids (fine particles) are finely dispersed in an aqueous dispersant composed of an aqueous liquid.

[0127] -Aqu...

Embodiment 1

[0312]

[0313] The fatty acid monoester-containing liquid constituting the insulating liquid was prepared as follows.

[0314] First, crude soybean oil was refined as follows to obtain refined soybean oil.

[0315] First, crude soybean oil is roughly refined by a low-temperature crystallization method using methanol, diethyl ether, petroleum ether, acetone, etc. as a solvent.

[0316] Next, 300 parts by volume of crudely refined crude soybean oil (first crudely refined oil) was put into the flask, and then 100 parts by volume of boiling water was poured into the flask to close the flask.

[0317] Next, the flask was shaken to mix the crude soybean oil (first crude refined oil) and boiling water.

[0318] Next, the flask was left still until the liquid mixture in the flask separated into three layers.

[0319] After complete separation was confirmed, the flask was moved to cold storage for 24 hours.

[0320] Then, transfer the unfrozen ingredients to other flasks.

[032...

Embodiment 2

[0355] Instead of the soybean oil fatty acid, except having used the rapeseed oil fatty acid prepared as follows, it carried out similarly to the said Example 1, and manufactured the liquid developer corresponding to each color.

[0356] The crude rapeseed oil was refined by the same operation as the soybean oil of Example 1 to obtain refined rapeseed oil (hereinafter, simply referred to as rapeseed oil.). The rapeseed oil mainly contains fatty acid glycerides with oleic acid as the main component, and the unsaturated fatty acid glycerides in the rapeseed oil is 98wt%. In addition, the oleic acid component and the linoleic acid component accounted for 52 mol% and 24 mol%, respectively, of the total fatty acid components.

[0357] Next, a transesterification reaction of the rapeseed oil and methanol was performed, and glycerin produced by the reaction was removed to obtain a liquid mainly composed of fatty acid monoesters. By further refining this liquid, rapeseed oil fatty ac...

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PUM

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Abstract

The invention provides a liquid developer which has superior fixing characteristic and superior dispersibility of toner particles to a recording medium. Further, the present invention also provides an image forming apparatus using such a liquid developer. The liquid developer is characterized by including an insulation liquid containing a fatty acid monoester, and toner particles comprised of a polyester resin. Average particle size of the toner particles is preferably in the range of 0.7-3 mu m, roundness is in the range of 0.85-0.98, and width of the particle size distribution of the toner particles S is below 1.4. The insulation liquid preferably further contains an aliphatic hydrocarbon and / or a silicone oil in addition to the fatty acid monoester. And content of fatty acid monoester in insulation liquid is preferably 5-55%.

Description

technical field [0001] The present invention relates to a liquid developer and an image forming device. Background technique [0002] Developers for developing an electrostatic latent image formed on a latent image carrier include dry toners and liquid developers (liquid toners), which are used in a dry state and are composed of The liquid developer is a toner composed of a colorant such as a pigment and a binder resin material, and the liquid developer disperses the toner in an electrically insulating carrier liquid (insulating liquid). [0003] The method of using dry toner uses toner in a solid state. Therefore, although it is convenient to use, the powder may have a bad influence on the human body. There are also problems in the uniformity of the toner. In addition, dry toners have the following problems: aggregation of particles is likely to occur, it is difficult to sufficiently reduce the size of toner particles, and it is difficult to form a high-resolution toner i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/12G03G9/13G03G15/10
Inventor 手岛孝秋冈宏治井熊健
Owner SEIKO EPSON CORP
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