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Toner for developing electrostatic latent image

An electrostatic latent image and toner technology, which is applied in the directions of developer, electrography, optics, etc., can solve the problems of particles not easy to peel off, poor image, etc., and achieve the effects of not easy to bad image, good transfer and cleaning

Inactive Publication Date: 2012-10-17
KYOCERA DOCUMENT SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when particles with a low aspect ratio adhere to the latent image carrier on the surface along the long axis, especially when cleaning the transfer residual toner, there is a possibility that the toner may squeeze through to remove the transfer residual toner. Phenomenon of toner device
[0009] Further, particles with a low aspect ratio are not easily peeled off from the latent image carrier (photosensitive drum)
Therefore, when the toner image is transferred from the latent image carrier, the center falls off (中抜け), and image defects are likely to occur.

Method used

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  • Toner for developing electrostatic latent image
  • Toner for developing electrostatic latent image
  • Toner for developing electrostatic latent image

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0062] [Preparation method of toner for developing electrostatic latent image]

[0063] The toner for developing electrostatic latent images of the present invention can be prepared as follows: after mixing components such as a colorant, a release agent, a charge control agent, and a magnetic powder in a binder resin, a toner mother particle of a desired particle size is prepared to make The external additive adheres to the surface of the obtained toner base particles.

[0064] In the method of preparing toner by blending components such as colorant, release agent, charge control agent, magnetic powder, etc. into the binder resin, if the resulting toner has a particle size of 3 μm or more and less than 10 μm, If the average aspect ratio is 0.820 or more and 0.900 or less, and the average aspect ratio Dn (n is an integer of 3 or more and 9 or less) of the average aspect ratio Dn of particles with a particle size of n μm or more and less than n + 1 μm, the difference between the maxi...

Embodiment

[0100] The following examples illustrate the present invention in more detail. Moreover, the present invention is not limited by the embodiment.

preparation example 1

[0103] 1960 g of propylene oxide adduct of bisphenol A, 780 g of ethylene oxide adduct of bisphenol A, 257 g of dodecenyl succinic anhydride, 770 g of terephthalic acid and 4 g of dibutyl tin oxide were added to the reaction In the container. Next, the inside of the reaction vessel was made into a nitrogen atmosphere, and the inside of the reaction vessel was heated to 235°C while stirring. Next, after performing the reaction at this temperature for 8 hours, the pressure in the reaction vessel was reduced to 8.3 kPa, and the reaction was performed for 1 hour. Then, the reaction mixture was 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 increased to 210°C at a rate of 10°C / hour, and the reaction was carried out at this temperature. After the reaction, the contents of the reaction vessel were taken out and cooled to obtain a polyester resin.

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Abstract

A toner for developing an electrostatic latent image includes toner particles. An average aspect ratio of the toner particles, having predetermined diameters of at least 3 [mu]m and less than 10 [mu]m, is in the range from about 0.820 to about 0.900, and the difference between the maximum value and minimum value among the average aspect ratios D3, D4, D5, D6, D7, D8, and D9 is up to 0.07. Dn represents an average aspect ratio of those toner particles having a diameter of at least n [mu]m and less than n+1 [mu]m. The toner is characterized by high image quality, good transfer performance and high cleanability.

Description

Technical field [0001] The present invention relates to a toner for developing electrostatic latent images. Background technique [0002] Generally, in the electrophotographic method, electrostatic recording method, etc., a latent image carrier composed of a photoconductive photosensitive body or a dielectric is charged by corona charging or the like. The charged latent image carrier is exposed by laser, LED, etc., thereby forming an electrostatic latent image on the latent image carrier. The formed electrostatic latent image can be visualized by a developer such as toner by a reversal development method, and a high-quality image can be obtained. As a toner generally applicable to this development method, a dye, a pigment, and a release agent mixed as a colorant or a charge control agent in a thermoplastic resin as a binder are used, for example, by kneading, pulverization, and classification. A toner having particles with an average particle diameter of 5 μm or more and 15 μm ...

Claims

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Application Information

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IPC IPC(8): G03G9/08G03G9/087
CPCG03G9/0819G03G9/0815G03G9/081G03G9/0827G03G9/08G03G9/087
Inventor 田中崇伯
Owner KYOCERA DOCUMENT SOLUTIONS INC
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