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

A technology of toner and colorant, applied in the field of toner, which can solve the problems of easily damaged toner capsule structure and poor fusion, and achieve the effect of stabilizing developability and improving chargeability

Inactive Publication Date: 2012-11-14
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This design method allows the shell material to be attached to the core part, however, there is a problem that fusion and film formation do not proceed well, so that the capsule structure of the toner is easily broken

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0083] "Masterbatch preparation method"

[0084] The masterbatch may be prepared by mixing / kneading the colorant for the masterbatch with the resin by applying high shear force. Also, organic solvents may be used to improve mixing between these materials. In addition, it is preferable to use a flash evaporation method in which an aqueous paste containing a colorant is mixed / kneaded with a resin and an organic solvent, and then the colorant is transferred to the resin to remove water and the organic solvent, because the Wet cake (ie, without drying) of the colorant described above. In such mixing / kneading, it is preferable to use a high-shear disperser (such as a three-roll mill).

[0085]

[0086] The external additive is not particularly limited, and inorganic particles and polymer particles known in the art can be preferably used. The primary particle size of the external additive is preferably 5 nm to 2 μm, more preferably 5 nm to 500 nm. The specific surface area det...

Embodiment 1

[0346]

[0347] Ion-exchanged water (963 parts), organic resin particles (copolymer of styrene-methacrylic acid-butyl acrylate-methacrylic acid ethylene oxide adduct sodium salt of sulfuric acid ester) for stable dispersion 88 parts of a 25% aqueous dispersion, 80 parts of a 48.5% aqueous solution of sodium dodecyl diphenyl ether disulfonate (Eleminol MON-7, a product of Sanyo Chemical Industries Ltd.), and 113 parts of ethyl acetate were mixed under stirring together to obtain a milky liquid. This liquid is referred to as aqueous phase 1.

[0348]

[0349] Polyester 1 (378 parts), paraffin ((HNP9, product of NIPPON SEIRO CO., Ltd.) (120 parts) and ethyl acetate (1450 parts) were charged into a container in which a stirring bar and a thermometer had been set. The The mixture was warmed to 80° C. with stirring, held at 80° C. for 5 hours, and cooled to 30° C. over 1 hour. The vessel was then charged with masterbatch 1 (500 parts) and ethyl acetate (500 parts), After that,...

Embodiment 2

[0365] Toner 2 of Example 2 was obtained in the same manner as in Example 1 except that the resin dispersion liquid 1 in the protrusion forming step was changed to the resin dispersion liquid 2 .

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Abstract

The present invention relates to a toner, an image forming method, an image forming apparatus, and a process cartridge. The toner includes: toner particles, each toner particle containing a toner base particle, wherein the toner contains a binder resin and a colorant, wherein the toner base particle has protrusions at a surface thereof, wherein an average of lengths of long sides of the protrusions is 0.1 [mu]m or more but less than 0.5 [mu]m, a standard deviation of the lengths of the long sides of the protrusions is 0.20 or less, and a coverage rate of the protrusions is 30% to 90%, wherein a resin forming the protrusions is prepared through polymerization of a monomer mixture containing at least a monomer having a sulfonic acid group, and wherein the monomer mixture contains styrene in an amount of 90% by mass or more and the monomer having a sulfonic acid group in an amount of 0.1% by mass to 5% by mass.

Description

technical field [0001] The present invention relates to a toner, a developer, and a process cartridge for an electrophotographic image forming apparatus, and an image forming method. Background technique [0002] In recent years, printers have excellent performance; in particular, full-color printers that are high-speed, have an extended life, and can produce high-quality images have been developed. Under the excellent performance, there are increasing demands on certain properties of the toner. In particular, high-speed printers require charging rising properties, stability, and stress resistance of toners. Much research has been done to improve these properties. [0003] For example, Japanese Patent Application Laid-Open (JP-A) Nos. 2006-503313, 2006-500605, and 2003-202708 each describe layered compounds for controlling charging. However, the charge-raising property of the toner is insufficient to provide desirable performance for one-component development. If an appr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/093G03G15/08G03G21/18G03G15/00
CPCG03G9/0806G03G9/08708G03G9/0825G03G9/08797G03G9/08795G03G9/08791G03G9/0827
Inventor 石川义通门田拓也御厨义博野崎刚不破一兴深尾朋宽三木智晴山本淳史
Owner RICOH KK
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