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Magenta toner, developer, toner cartridge, image forming apparatus and printed matter

A magenta, toner technology, applied in the direction of developer, electric recording process applying charge pattern, equipment for applying electric recording process of charge pattern, etc., can solve the problems of hard crystal, difficult to disperse, unable to reproduce hue and so on

Inactive Publication Date: 2014-09-17
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A crystalline material with a narrow half width is used, and since the crystallinity is strong and the crystal is hard, it is difficult to disperse in the toner, resulting in insufficient concentration and hue
In addition, the spreadability of the toner is insufficient, and hue reproduction cannot be performed when the toner adhesion amount is small

Method used

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  • Magenta toner, developer, toner cartridge, image forming apparatus and printed matter
  • Magenta toner, developer, toner cartridge, image forming apparatus and printed matter
  • Magenta toner, developer, toner cartridge, image forming apparatus and printed matter

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0250] In the preparation of the magenta toner, the amorphous resin is preferably a polyester resin incompatible with the particulate acrylic resin. In the emulsion or dispersion preparation process, when the particulate acrylic resin is added before or after emulsification or dispersion, the particulate acrylic resin may be dissolved after adhering to the surface of the toner material droplet, because therein Organic solvents are present. When a polyester resin forms a toner and the granular acrylic resin is a granular cross-linked resin including an acrylate polymer or a methacrylate polymer, the granular acrylic resin sticks to each other because the resins are incompatible with each other. The manner in which the toner material droplets are attached is incompatible. Therefore, the particulate acrylic resin penetrates to some extent from the surface of the liquid droplet, and preferably adheres to the surface of the toner and is fixed thereon after the organic solvent is r...

Embodiment

[0258] Having generally described this invention, further understanding can be obtained by reference to some specific examples which are given herein for purposes of illustration only and are not intended to be limiting. In the description of the following examples, unless otherwise specified, the quantities represent weight ratios in parts.

[0259]

[0260] (1) Preparation of a pigment composition comprising Pigment Red 184

[0261] Disperse eighty-four (84) parts of 3-amino-4-methoxy-N-benzanilide in 1,500 parts of water, add ice to the resulting dispersion to have a temperature not higher than 0°C, and add 125 parts of aqueous hydrochloric acid with a strength of 35% and stirred for 1 h for chlorination.

[0262] Next, after adding 61.5 parts of an aqueous sodium nitrite solution having a concentration of 40% to the chlorinated dispersion and stirring for 1 h, 4 parts of sulfamic acid were added thereto to decompose excess nitrous acid to form an aqueous diazonium solut...

Embodiment 1-6 and comparative example 2-4

[0321] The toner preparation procedure in Comparative Example 1 was repeated except that the master batch MBA1 was replaced with the following master batch to obtain the toners of Examples 1-6 and Comparative Examples 2-4.

[0322]

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PUM

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Abstract

A magenta toner includes a binder resin including an amorphous resin; a magenta pigment comprising a naphthol pigment; and a release agent. The magenta toner has a glass transition temperature of from 19 to 40 DEG C. The naphthol pigment has an X-ray diffraction pattern having plural peaks in the following range: 0 DEG <= 2theta <= 35 DEG, wherein theta is a Bragg angle. The sum of half widths of the respective peaks is from 5 to 10 DEG.

Description

technical field [0001] The present invention relates to a magenta toner, a developer for electrophotography, a toner cartridge for electrophotography, an image forming apparatus, and a printed matter using the magenta toner. Background technique [0002] Recently, toners have been required to have smaller particle diameters to produce higher-quality images, and low-temperature fixability to save energy. In particular, the power consumed from turning on to image generation (warm-up time) is preferably as small as possible, and shortening of the warm-up time is strongly demanded. However, it has been technically difficult for toners prepared by conventional kneading methods to have a smaller particle diameter. They have various problems, for example, their shape is amorphous, the particle size distribution is wide, and the fixing energy is high. In particular, the toner prepared by the kneading and pulverizing method is cracked at the interface with the release agent, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/09G03G9/08G03G9/093G03G15/08G03G21/18G03G15/00
CPCG03G9/08797G03G9/091G03G9/0914G03G9/09314G03G9/09321G03G9/08795G03G9/0922
Inventor 山下裕士斯波正名杉本强朝比奈大辅千叶晋关口圣之
Owner RICOH KK