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Electrostatic charge image developing toner

A technology for electrostatic charge images and toners, which can be applied to developers, electrographics, instruments, etc., can solve the problems of lack of charging stability and high moisture content, and achieve the effect of inhibiting durable deterioration and high charging stability.

Inactive Publication Date: 2015-11-11
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, since the irregular-shaped external additive particles disclosed in Patent Document 2 are produced by a sol-gel method, they have a high moisture content, and therefore, there is a problem that charging stability cannot be obtained in a high-temperature, high-humidity environment.

Method used

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Examples

Experimental program
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Effect test

manufacture example 1

[0199] (1) Preparation of colorant particle dispersion

[0200] Add 11.5 parts by mass of n-dodecyl sodium sulfate to 160 parts by mass of ion-exchanged water, and slowly add 24.5 parts by mass of copper phthalocyanine while stirring the solution, and then use the stirring device "CLEARMIXWMOTIONCLM-0.8" (manufactured by MTechnique) Dispersion treatment was performed, thereby preparing a dispersion liquid of colorant fine particles having a volume-based median diameter of 126 nm. This was used as a colorant fine particle dispersion [C].

[0201] (2) Preparation of dispersion liquid of styrene acrylic resin particles

[0202] (step 1 aggregation)

[0203] In a reaction vessel equipped with a stirring device, a temperature sensor, a temperature control device, a cooling pipe, and a nitrogen gas introduction device, 2.0 parts by mass of anionic surfactant "sodium lauryl sulfate" was dissolved in 2900 parts by mass of ion-exchanged water. The resulting anionic surfactant soluti...

manufacture example 2～3

[0216] In Production Example 1 of Toner Matrix Particles (2) In the third polymerization step of preparation of a dispersion of styrene-acrylic resin particles, styrene (St) and acrylic acid constituting the monomer solution (3) were changed according to Table 1. Except for the formulation of n-butyl ester (BA) and methacrylic acid (MAA), prepare styrene acrylic resin microparticle dispersions [2] to [3] in the same manner, (3) Manufacturing process of toner matrix particles In , the toner matrix particles [2] to [3] were produced in the same manner except that the styrene acrylic resin fine particle dispersion [2] to [3] was used instead of the styrene acrylic resin fine particle dispersion [1].

[0217] [Table 1]

[0218] [Table 1]

[0219]

manufacture example 4

[0221] Production Example 1 of Toner Matrix Particles (3) In the production of toner matrix particles, the polyester resin microparticle dispersion [1] prepared as follows was used instead of the styrene acrylic resin microparticle dispersion [1], except In addition, toner matrix particles [4] were produced in the same manner.

[0222] -Preparation of dispersion liquid of polyester resin particles-

[0223] (1) Synthesis of polyester resin

[0224] In the reaction tank with cooling tube, mixer and nitrogen inlet pipe, add 360 mass parts of bisphenol A propylene oxide 2 molar adducts, 80 mass parts of terephthalic acid, 55 mass parts of fumaric acid and 2 Parts by mass of titanium tetraisopropoxide as a polycondensation catalyst were reacted at 200°C for 10 hours under a nitrogen stream while distilling off generated water. Next, the reaction was performed under a reduced pressure of 13.3 kPa (100 mmHg), and when the softening point reached 104° C., it was taken out to synthe...

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Abstract

An electrostatic charge image developing toner includes: toner matrix particles containing a binder resin; and an external additive added to the toner matrix particles, wherein the external additive includes joined particles each including a secondary particle including a plurality of spherical primary particles joined together, the joined particles include at least particles with a secondary particle size d2 in the range of 70 nm to 400 nm, and particles with a ratio d2 / d1 in the range of 1.6 to 4.2 make up at least 50% by number of the particles with a secondary particle size d2 in the range of 70 nm to 400 nm, wherein d1 is the diameter of primary particles in the joined particle, and d2 is the secondary particle size.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic charge image used in electrophotographic image formation. Background technique [0002] In image forming apparatuses such as printers and multi-function peripherals using electrophotography, the speed and image quality are increasing. If the speed-up progresses, the mechanical stress received by the toner for electrostatic charge image development (hereinafter, simply referred to as "toner") in the developing device increases, but it is required that even under the situation of realizing such speed-up, Stable output of high-quality images. [0003] In an image forming apparatus, in order to stably output a high-quality image while achieving high speed, it is necessary to use a toner whose durability degradation is suppressed as the toner. [0004] A toner is generally constituted by adding a particulate external additive composed of inorganic fine powder or resin to the surface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/087
CPCG03G9/08711G03G9/0819G03G9/08724G03G9/08755G03G9/08795G03G9/09725
Inventor 樱田育子内野哲内野泰子小原慎也门目大司小鹤浩之
Owner KONICA MINOLTA INC
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