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Toner, two-component developer, and image forming method

A toner and colorant technology, applied in the directions of developer, electrography, optics, etc., can solve the problems of heat-resistant storage stability degradation, deterioration of developing components and carriers, contamination of developing components and carriers, etc.

Active Publication Date: 2014-08-13
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In general, the low-temperature fixability of toner can be improved by lowering the softening point of toner, however, it deteriorates heat-resistant storage stability
Such a low softening point toner also contaminates and degrades the developing member and the carrier

Method used

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  • Toner, two-component developer, and image forming method
  • Toner, two-component developer, and image forming method
  • Toner, two-component developer, and image forming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0150] Preparation of Vinyl Resin Particle Emulsion

[0151] To a reaction vessel equipped with a condenser, a stirrer, a nitrogen gas inlet tube, and a thermometer, the raw materials for vinyl resin particle emulsion 1 described in Table 1 were charged. The material was heated to 80°C while stirring under a nitrogen atmosphere and maintained at 80°C for 8 hours. Thus, vinyl resin particle emulsion 1 was prepared.

[0152] Table 1

[0153]

[0154] The volume average particle diameter of the vinyl resin particle emulsion 1 was 330 nm when measured with a laser diffraction particle size distribution analyzer LA-920 (from Horiba, Ltd.). A part of the vinyl resin particle emulsion 1 was dried to separate the vinyl resin. The isolated vinyl resin had a glass transition temperature of 69°C and a peak average molecular weight of 16,000.

[0155] Preparation of the aqueous phase

[0156] By mixing 990 parts of water, 83 parts of vinyl resin particle emulsion 1, 37 parts of a ...

Embodiment 2

[0179] Vinyl particle emulsion 2 was prepared in the same manner as vinyl particle emulsion 1, except that the raw materials described in Table 1 were replaced. The procedure for preparing toner 1 in Example 1 was repeated except that vinyl resin particle emulsion 1 was replaced with vinyl resin particle emulsion 2 . Thus, Toner 2 was produced.

[0180] The volume average particle diameter of the vinyl resin particle emulsion 2 was 220 nm. The dried vinyl resin isolated from the vinyl resin particle emulsion 2 had a glass transition temperature (Tg) of 66° C. and a peak average molecular weight of 130,000.

Embodiment 3

[0182] Vinyl particle emulsion 3 was prepared in the same manner as vinyl particle emulsion 1, except that the raw materials described in Table 1 were replaced. The procedure for preparing toner 1 in Example 1 was repeated except that vinyl resin particle emulsion 1 was replaced with vinyl resin particle emulsion 3 . Thus, Toner 3 was produced.

[0183] The volume average particle diameter of the vinyl resin particle emulsion 3 was 170 nm. The dried vinyl resin separated from the vinyl resin particle emulsion 3 had a glass transition temperature (Tg) of 63° C. and a peak average molecular weight of 9,000.

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Abstract

The present invention relates to a toner, a two-component developer, and an image forming method. The toner contains mother particles and external additives. The matrix particles include: a core including crystalline polyester, amorphous polyester, a colorant, and a release agent; and a shell including resin particles. The amount of deformation H1 of the toner compressed by a pressure of 0.5 mN at a temperature of 25° C. is 0.2 to 1.5 μm. The difference D between the amount of deformation H1 and the amount of deformation H2 of the toner compressed by a pressure of 0.5 mN at a temperature of 50° C. is 0.0 to 1.0 μm. The surface roughness Ra of the toner melted at 90° C. is 0.02 to 0.40 μm.

Description

technical field [0001] The present disclosure relates to toners, developers, and image forming methods. Background technique [0002] An electrophotographic or electrostatic image forming apparatus generally forms an image by forming an electrostatic latent image on a photoreceptor, developing the electrostatic latent image into a toner image with toner, and transferring the toner image to a recording surface. on the medium, and fix the toner image thereon by applying heat. [0003] Toners need to be fused at much lower temperatures to meet recent demands for energy savings. [0004] Polyester resins have recently been widely used instead of vinyl resins, which have been widely used as toner binders, because polyester resins can be fused and fixed to recording media at much lower temperatures. For example, Japanese Patent Application Laid-Open No. 11-249339 proposes a toner containing a crystalline polyester to improve low-temperature fixability. [0005] In general, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/08G03G9/087G03G15/00
CPCG03G9/09385G03G9/09371G03G9/09307G03G9/09378G03G9/09392G03G15/2064G03G9/0935
Inventor 杉浦英树
Owner RICOH KK