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Toner, image forming apparatus, image forming method and process cartridge

A toner and colorant technology, applied in the field of dry toner for electrostatic image development, can solve problems such as background smearing

Active Publication Date: 2012-10-03
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in this proposal, the charge control resin contained in the protruding portion has high polarity and thus has a large change in performance depending on the environment, therefore, there are problems, for example, with respect to: Background smearing, and thermal storage stability

Method used

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  • Toner, image forming apparatus, image forming method and process cartridge
  • Toner, image forming apparatus, image forming method and process cartridge
  • Toner, image forming apparatus, image forming method and process cartridge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0406]

[0407] In a container equipped with a stirring bar and a thermometer, 545 parts of polyester 2, 181 parts of paraffin (melting point: 74° C.) and 1450 parts of ethyl acetate were placed. While stirring the ingredients, raise the temperature to 80°C. The temperature was maintained at 80°C for 5 hours, then cooled to 30°C over 1 hour. Subsequently, 500 parts of master batch 1 and 100 parts of ethyl acetate were poured into the container, followed by mixing for 1 hour, and thus raw material solution 1 was obtained.

[0408] Then, 1500 parts of the raw material solution 1 was transferred to another container, and the pigment and the wax were dispersed using a bead mill (ULTRA VISCO MILL, manufactured by AIMEX Co., Ltd.) under the following conditions: The liquid delivery rate was 1 kg / hour, disc peripheral speed 6 m / sec, zirconium beads each 0.5 mm in size were fed to occupy 80% of the volume, and the composition was passed through three times. Subsequently, 655 parts...

Embodiment 2

[0426] A toner of Example 2 was produced in the same manner as in Example 1, except that Polyester 3 was used instead of Polyester 2.

Embodiment 3

[0428] A toner of Example 3 was produced in the same manner as in Example 1, except that Polyester 3 was used instead of Polyester 2 and Resin Dispersion 2 was used instead of Resin Dispersion 1 .

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Abstract

A toner including a binder resin, a colorant and protruding portions on a surface of the toner, wherein the average length of long sides of the protruding portions is 0.1 [mu]m or greater, but less than 0.5 [mu]m, wherein the standard deviation of the lengths of the long sides of the protruding portions is 0.2 or less, and wherein the protruding portions have a coverage of 30% to 90%.

Description

technical field [0001] The present invention relates to a dry toner for electrostatic image development for developing an electrostatic latent image formed by electrophotography, electrostatic recording, or electrostatic printing, and also relates to an image forming apparatus using the toner , imaging method and process cartridge. Background technique [0002] Dry developing apparatuses each using a powdery developer are widely used in image forming apparatuses such as electronic copiers, printing machines, and facsimile machines, in which an electrostatic latent image is formed on a latent image bearing member, and then, using The developer visualizes the electrostatic latent image, thereby obtaining a recorded image. [0003] In recent years, electrophotographic color imaging devices have become increasingly popular. Furthermore, there is a need to further improve the sharpness of printed patterns, which is related to the fact that digitized images are readily available...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/087
CPCG03G9/0806G03G9/08708G03G9/0825G03G9/0819G03G9/08795G03G9/09307G03G9/08797G03G9/0804G03G9/0827G03G9/08G03G9/087G03G9/093
Inventor 深尾朋宽门田拓也御厨义博野崎刚石川义通山本淳史三木智晴不破一兴
Owner RICOH KK
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