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Toner for electrostatic latent image development and method of producing toner for electrostatic latent image development

An electrostatic latent image and toner technology, which is applied in the direction of developer, electrography, optics, etc., can solve the problems of poor image, charged toner, low image density, etc., and achieve the effect of suppressing bad image

Inactive Publication Date: 2013-05-15
KYOCERA DOCUMENT SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, since the above-mentioned two kinds of toners proposed in order to prevent the extrusion of the transfer residual toner when cleaning the transfer residual toner are easy to adhere to the surface of the latent image carrier, there is a possibility that the toner may be distorted during transfer. A part of the agent image is not transferred and an image defect called "center drop-off (中抜け)" occurs in the formed image
Moreover, when the above-mentioned two types of toner are printed at a low coverage ratio for a long time, the toner is subjected to pressure for a long time due to the agitation in the developing device, so that it is difficult to charge the toner to a desired potential, and the resulting image is not stable. Image density may be lower than expected

Method used

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  • Toner for electrostatic latent image development and method of producing toner for electrostatic latent image development
  • Toner for electrostatic latent image development and method of producing toner for electrostatic latent image development

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preparation example Construction

[0057] [Manufacturing method of toner for electrostatic latent image development]

[0058] The toner for developing an electrostatic latent image of the present invention is a mixture of pulverized toner, a colorant, a charge control agent, a release agent, and, if necessary, components such as magnetic powder, mixed with a binder resin. After melt-kneading, the melt-kneaded product is pulverized and classified so as to have a desired particle size, thereby preparing it. The average particle diameter of the pulverized and classified toner is not particularly limited within a range that does not hinder the object of the present invention, but is usually preferably 5 μm or more and 10 μm or less.

[0059] As a preferred method of producing such toner particles, there is a method in which a binder resin, a colorant, a charge control agent, a release agent, and, if necessary, components such as magnetic powder are mixed with a mixer. , melt and knead the obtained mixture with a k...

Embodiment

[0104] The present invention will be described more specifically by way of examples below. In addition, this invention is not limited to an Example.

preparation example 1

[0107]Add 1960g of propylene oxide adduct of bisphenol A, 780g of ethylene oxide adduct of bisphenol A, 257g of dodecenyl succinic anhydride, 770g of terephthalic acid and 4g of dibutyltin oxide to the reaction in the container. Next, the temperature in the reaction container was raised to 235° C. while stirring under a nitrogen atmosphere. Next, after carrying out reaction at this temperature for 8 hours, the inside of a reaction container was decompressed to 8.3 kPa, and reaction was carried out for 1 hour, and the reaction mixture was obtained. The reaction mixture was then cooled to 180°C and trimellitic anhydride was added to the reaction vessel to form the desired oxidation. Next, the temperature of the reaction mixture was raised to 210° C. at a rate of 10° C. / hour, and the reaction was carried out at this temperature. After completion of the reaction, the contents of the reaction container were taken out and cooled to obtain a polyester resin.

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Abstract

The invention provides a toner for electrostatic latent image development and a method of producing toner for electrostatic latent image development. The toner for electrostatic latent image development includes at least a colorant, a charge control agent, and a release agent in a binder resin and is produced using a pulverizing process. An average circularity of the toner is 0.960 or more and 0.980 or less with respect to toner particles having a primary particle diameter of 3 [mu]m or more and 10 [mu]m or less. A numerical proportion of toner particles, having a concave portion of which outer diameter is 200 nm or more and being observed by a predetermined condition, is 10% by number or less. The outer diameter is obtained by scanning electron microscope images. With the toner for electrostatic latent image development, the occurrence of image defects in resulting images due to the toner passing-through cleaning units and image defects in resulting images such as void can be suppressed and image density of resulting images does not become lower than a desired value even when printing at a lower coverage rate for a long period.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic latent image and a preparation method of the toner for developing an electrostatic latent image. Background technique [0002] Generally, in the electrophotography method, after the surface of the latent image carrier is charged by corona charging or the like, the electrostatic latent image formed by exposing it by laser light or the like is visualized as a toner image by developing it with a developer such as toner , resulting in high-quality images. Toners used in these developing methods are generally prepared by melting and kneading a binder resin with components such as a colorant, a charge control agent, and a release agent, and then pulverizing the melt-kneaded product. and a toner obtained by classification and composed of toner particles having an average particle diameter of not less than 5 μm and not more than 10 μm. Also, generally, inorganic fine powder such as sili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/087
CPCG03G9/0825G03G9/0808G03G9/0819G03G9/0815G03G9/0817G03G9/08755G03G9/081G03G9/0827G03G9/08G03G9/097
Inventor 田中崇伯玉垣昌志
Owner KYOCERA DOCUMENT SOLUTIONS INC
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