Toner for electrostatic image development

An electrostatic charge image and toner technology, applied in the direction of developer, electrography, optics, etc., can solve the problems of difficult toner particles, high chargeability, and inability to ensure image quality, and achieve excellent chargeability, low temperature The effect of excellent fixability

An electrostatic charge image and toner technology, applied in the direction of developer, electrography, optics, etc., can solve the problems of difficult toner particles, high chargeability, and inability to ensure image quality, and achieve excellent chargeability, low temperature The effect of excellent fixability

CN102736455AActive Publication Date: 2012-10-17KONICA MINOLTA BUSINESS TECH INC
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  • Toner for electrostatic image development
  • Toner for electrostatic image development
  • Toner for electrostatic image development

Examples

Experimental program
Comparison scheme
Effect test

manufacture example

[0136] Concretely showing a production example of a toner containing a colorant when the toner of the present invention is produced by the emulsion polymerization coagulation method, it consists of the following steps:

[0137] (1-1) A shell resin particle dispersion liquid preparation process of forming shell resin particles made of a shell resin in an aqueous medium to prepare a dispersion liquid in which the shell resin particles are dispersed;

[0138] (1-2) A binder resin polymerization process in which binder resin particles made of binder resin are formed by polymerization in an aqueous medium to prepare a dispersion liquid in which the binder resin particles are dispersed;

[0139] (1-3) A coloring agent particle dispersion liquid preparation process of preparing a dispersion liquid obtained by dispersing colorant particles made of a colorant in an aqueous medium;

[0140] (2) a nuclei particle forming process of agglomerating the binder resin microparticles and the co...

manufacture example 1

[0234] (1) Preparation process of binder resin particle dispersion

[0235] (1-1) Step 1 Aggregation

[0236] Add an anionic surfactant solution obtained by dissolving 2.0 parts by mass of anionic surfactant "sodium lauryl sulfate" in 2900 parts by mass of ion-exchanged water in advance into a device equipped with a stirring device, a temperature sensor, a temperature control device, and a cooling In the reaction container of the tube and the nitrogen introduction device, the internal temperature was raised to 80° C. while stirring at a stirring rate of 230 rpm under a nitrogen flow.

[0237] 9.0 parts by mass of a polymerization initiator "potassium persulfate (KPS)" was added to the anionic surfactant solution, and after the internal temperature was 78° C., the

[0238]

[0239] Formed monomer solution [1]. After completion of the dropwise addition, polymerization was carried out by heating and stirring at 78° C. for 1 hour (first-stage polymerization), thereby preparin...

manufacture example 1～16

[0275] (1) Production of carrier

[0276] Add the copolymer resin particles of the ferrite nucleus of 100 mass parts and the cyclohexyl methacrylate / methyl methacrylate (copolymerization ratio 5 / 5) of 5 mass parts in the high-speed mixer with paddle, at 120 The mixture was stirred and mixed for 30 minutes at °C, and a resin coating was formed on the surface of the ferrite core under the action of a mechanical impact force, thereby obtaining a carrier with a volume-based median diameter of 50 μm.

[0277] The volume-based median diameter of the carrier was measured using a laser diffraction particle size distribution analyzer "HELOS" (manufactured by Sympathique) equipped with a wet disperser.

[0278] (2) Mixing of toner and carrier

[0279] The above-mentioned carrier was added to each toner [1] to [16] to a toner concentration of 6%, and mixed for 30 minutes at a rotation speed of 45 rpm using a micro V-type mixer (Tsutsui Physical and Chemical Device Co., Ltd.). This made...

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Abstract

Disclosed is a toner for electrostatic image development that satisfies both low-temperature fixing ability and excellent high-temperature storage stability, achieves excellent charge property and shatter resistance, and consequently can form a high-quality image even by a high-performance machine such as a high-speed machine. The toner is composed of toner particles obtained by forming a shell layer containing a styrene-acryl-modified polyester resin on the surface of each of core particles comprising a binder resin containing at least a styrene-acrylic resin. The styrene-acryl-modified polyester resin is obtained by bonding a styrene-acrylic polymer segment to a terminal of a polyester segment, and the content of the styrene-acrylic polymer segment in the styrene-acryl-modified polyester resin is 5% by mass or more and 30% by mass or less.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic charge image used for image formation in an electrophotographic system. Background technique [0002] In recent years, in the field of toners for electrostatic image development (hereinafter simply referred to as "toners"), in response to market demands, the electrophotographic devices applicable to them and the toners that can be used therein Development moves fast. [0003] For example, as a toner corresponding to high image quality, each toner particle has uniform development behavior, thereby remarkably improving the reproducibility of minute dots, and therefore, a toner with a narrow particle size distribution is required. . However, it is not easy to obtain a toner with a narrow particle size distribution by the conventional pulverization method. On the other hand, an emulsion polymerization coagulation method has been proposed as a production method capable of arbitraril...

Claims

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Application Information

Patent Timeline
17 Oct 2012
Publication
CN102736455A
IPC
G03G9/08; G03G9/087
CPC
G03G9/09392; G03G9/09364; G03G9/09328
Inventors
大西隼也; 平野史朗