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Electrostatic charge image developing toner

A technology of electrostatic charge images and toners, which can be used in developers, electrographics, instruments, etc., and can solve the problems of disappearance, difficult particle size distribution, difficult development and transferability, etc.

Active Publication Date: 2016-12-21
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle size distribution is difficult to completely disappear, and it is difficult to completely uniformly control the developability and transferability

Method used

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  • Electrostatic charge image developing toner

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0120] (The preparation method of styrene-acrylic acid modified polyester resin)

[0121] As a method for producing the above-mentioned styrene-acrylic modified polyester resin, existing general schemes can be used. As a typical method, the following four methods can be mentioned.

[0122] (A) Polymerize the polyester segment in advance, react the two reactive monomers with the polyester segment, and further use the aromatic vinyl monomer and (a base) acrylate monomers to react to form styrene-acrylic polymer segments. That is, in a two-reactive monomer having a group capable of reacting with a polycarboxylic acid monomer or a polyol monomer used to form a polyester segment and a polymerizable unsaturated group, and an unmodified polyester A method of polymerizing aromatic vinyl monomers and (meth)acrylate monomers to form styrene-acrylic polymer segments in the presence of a resin.

[0123] (B) Polymerize the styrene-acrylic polymer segment in advance, react the two reacti...

Embodiment 1

[0298] Example 1: Preparation of Toner 1

[0299] (Preparation of crystalline polyester resin [1])

[0300] Put 315 parts by mass of 1,10-decanedicarboxylic acid (dodecanedioic acid) and 252 parts by mass of 1,9-nonanediol into a reaction vessel equipped with a stirrer, a thermometer, a cooling pipe, and a nitrogen gas introduction pipe , after replacing the reaction container with dry nitrogen, 0.1 parts by mass of titanium tetrabutoxide was added, and a polymerization reaction was performed for 8 hours while stirring at 180° C. under a nitrogen stream. Further, 0.2 parts by mass of titanium tetrabutoxide was added, and the polymerization reaction was carried out for 6 hours while raising the temperature to 220° C. and stirring. After that, the pressure in the reaction vessel was reduced to 10 mmHg, and the reaction was carried out under reduced pressure to obtain crystals. permanent polyester resin [1]. The weight average molecular weight (Mw) of the crystalline polyester ...

Embodiment 2

[0355] Example 2: Preparation of Toner 2

[0356] In the production of toner 1, toner 2 was obtained in the same manner as that of toner 1 except that the input amount of sodium dodecyl diphenyl ether disulfonate was 1.5% by mass.

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Abstract

Provided is an electrostatic charge image developing toner which is capable of forming high-quality images for a long time period. An electrostatic charge image developing toner, including at least a binder resin, a colorant, and a mold release agent, wherein a coefficient of variation of volume particle size distribution of the toner particles is 18% or less, and in a particle shape distribution analysis made using a flow type particle image analyzer, when an equivalent circle average particle diameter of the toner particles is designated as D (microns), an average aspect ratio of toner particles having an equivalent circle particle diameter in the range of (D3) to (D2) (microns) is designated as AR(L), and an average aspect ratio of toner particles having an equivalent circle particle diameter in the range of (D+3) to (D+4) (microns) is designated as AR(H), the relationship represented by the following Expression (1) is satisfied.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic charge image for use in electrophotographic image formation. Background technique [0002] In recent years, in the field of toners for electrostatic charge image development (hereinafter, also simply referred to as "toners"), electrophotographic devices suitable therefor and toners usable therein are being rapidly developed in response to market demands. Toner development. [0003] For example, from the viewpoint of improving image quality, the particle diameter of toner is being reduced. In addition, from the viewpoint of productivity improvement, speeding up is progressing. Generally speaking, as the particle size of the toner becomes smaller, the physical adhesion increases, and the electrostatic adhesion due to the increase in the charge amount also increases, resulting in a decrease in developability or transferability, especially in halftone images. The reduction of the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/087
CPCG03G9/0804G03G9/0827G03G9/08711G03G9/08755G03G9/0819G03G9/08797G03G9/09725G03G9/08728
Inventor 大西隼也藤崎达矢春木秀仁古川淳一平野史朗
Owner KONICA MINOLTA INC