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Positively chargeable toner for electrostatic charge image development

An electrostatic image development, electropositive technology, applied in the direction of developer, electric recording process applying charge pattern, equipment for electric recording process applying charge pattern, etc. Excellent fine line reproducibility, less ashing, and stable charging and fluidity effects over a long period of time

Active Publication Date: 2012-10-10
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] However, for toners obtained by using the external additives disclosed in Patent Documents 1 to 5, although attempts have been made to improve the functions of the external additives, images that can respond to the toner replenishment methods required in recent years have not yet been achieved. high performance forming device

Method used

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  • Positively chargeable toner for electrostatic charge image development
  • Positively chargeable toner for electrostatic charge image development
  • Positively chargeable toner for electrostatic charge image development

Examples

Experimental program
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Effect test

preparation example Construction

[0039] (1) Preparation steps of polymerizable monomer composition

[0040] First, a polymerizable monomer, a colorant, a charge control agent, and, if necessary, other additives such as a release agent are mixed and dissolved to prepare a polymerizable monomer composition. The mixing at the time of preparing a polymerizable monomer composition can be performed using a media type disperser, for example.

[0041] In the present invention, a polymerizable monomer is also referred to as a monomer having a polymerizable functional group, and the polymerizable monomer is polymerized to form a binder resin. The main component of the polymerizable monomer is preferably a monovinyl monomer. Examples of monovinyl monomers include: styrene; vinyl toluene, and styrene derivatives such as α-methylstyrene; acrylic acid and methacrylic acid; methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, Acrylates such as 2-ethylhexyl acrylate and dimethylaminoethyl acrylate; methyl meth...

Embodiment

[0167] Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to these examples. Unless otherwise specified, "parts" and "%" are based on weight.

[0168] The test methods performed in the present examples and comparative examples are as follows.

[0169] (Evaluation method)

[0170] (1) External additives

[0171] (1-1) Number average primary particle size

[0172] The number-average primary particle size of the external additive is obtained by taking an electron microscope photo of each particle, and processing the photo with an image processing and analysis device (manufactured by NIRECO, trade name: LUZEX IID). The area ratio of the particle to the frame area: max. 2%, the total number of processed particles: under the condition of 100, calculate the diameter corresponding to a circle corresponding to the projected area of ​​the particles, and calculate the arit...

preparation example 1

[0217] (I) Synthesis of Hydrophilic Spherical Colloidal Silica Microparticles 1

[0218] 623.7 g of methanol, 41.4 g of water, and 49.8 g of 28% ammonia water were added to a 3 L glass reactor equipped with a stirrer, a dropping funnel, and a thermometer, and mixed. Adjust the temperature of the mixed solution to 35°C, and start to add a mixture of 1205.0g tetramethoxysilane and 100.6g tetrabutoxysilane, and 418.1g 5.4% ammonia water, tetramethoxysilane and tetrabutyl The mixture of oxysilane was added dropwise over 6 hours and 5.4% ammonia water over 5 hours, respectively.

[0219] After the dropwise addition was completed, stirring was continued for another 0.5 hour to conduct hydrolysis, thereby obtaining a suspension of hydrophilic spherical colloidal silica fine particles.

[0220] Next, an ester adapter and a condenser were attached to the above-mentioned 3 L glass reactor, the temperature of the obtained suspension was heated to 60 to 70° C., methanol was distilled off...

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Abstract

This invention provides a positively chargeable toner for electrostatic charge image development which can also be used with a toner supply-type image forming apparatus and, in the supply of a toner, can realize no significant fogging and imparting of temporally stable electrification properties and fluidity to toner particles, and, even in continuous printing of a number of sheets, can realize an excellent hairline reproducibility in a print, and, even under a high-temperature and high-humidity environment, is less likely to cause a deterioration in image quality due to fogging or the like and can realize excellent print durability. The positively chargeable toner for electrostatic charge image development comprises a binder resin, colorant-containing colored resin particles, and an external additive. The external additive contains fine particles of spherical colloidal silica having a number average primary particle diameter of 30 to 80 nm and a triboelectrification amount of -50 to +300 [mu]C / g, and fine particles of fumed silica having a number average primary particle diameter of 5 to 25 nm. The content of the fine particles of spherical colloidal silica and the content of the fine particles of fumed silica are 0.3 to 2 parts by weight and 0.1 to 1 part by weight, respectively, based on 100 parts by weight of the colored resin particles.

Description

technical field [0001] The present invention relates to a positively chargeable toner for electrostatic image development (hereinafter simply referred to as "positively chargeable toner" or "Toner"). More specifically, it relates to a positively chargeable toner for electrostatic image development applicable to an image forming apparatus of a toner replenishment system. Background technique [0002] Image forming apparatuses such as electrophotographic devices, electrostatic recording devices, and electrostatic printing devices widely use an image forming method in which an electrostatic latent image formed on a photoreceptor is developed with a toner for developing an electrostatic image, thereby forming a desired image. It is used in copiers, printers, facsimile machines and their all-in-one machines. [0003] For example, in an electrophotographic device employing electrophotography, the surface of a photoreceptor containing a photoconductive substance is generally char...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/08G03G15/08
CPCG03G9/0806G03G9/09716G03G9/09725G03G9/09791G03G9/0827
Inventor 家田修
Owner ZEON CORP
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