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Suspension polymerized toner in core-shell structure with positive charges and preparation method

A technology of core-shell structure and suspension polymerization, which is applied in the field of toner manufacturing, can solve problems such as wide charge distribution, background pollution of printed images, and difficulty in satisfying low-temperature fixation, and achieve low-temperature fixation, good reactivity, excellent chargeability and The effect of environmental stability

Active Publication Date: 2014-11-19
SHENZHEN LEPUTAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the irregular shape of the mechanically pulverized toner, the pressure applied by the scraper to each toner particle is different, and at the same time, CCA tends to form a phase separated from the binder resin, and the electric CCA particles exposed on the surface of the toner are easily Peeling off, so the mechanically pulverized toner is not uniformly charged, and the charge distribution is very wide
[0006] The patent document CN101427186 disclosed by the Chinese Patent Office provides a mechanically pulverized toner based on styrene / acrylate and polyester binder resin, using a charge control agent with good compatibility with styrene / acrylate, ink The uniformity and retention of powder charge distribution have been greatly improved, but it is difficult to meet the needs of low temperature fixing
Excessive use of reactive anionic surfactants used in this method will result in too fine particles in the suspension system, which will cause background pollution to the printed image

Method used

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  • Suspension polymerized toner in core-shell structure with positive charges and preparation method
  • Suspension polymerized toner in core-shell structure with positive charges and preparation method
  • Suspension polymerized toner in core-shell structure with positive charges and preparation method

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preparation example Construction

[0025] see figure 1 , the preparation method of positively charged core-shell structure suspension polymerization toner provided by the invention comprises the following steps:

[0026] (1) Prepare respectively the monomer oil phase constituting the toner soft core particle and the aqueous dispersion liquid for dispersing the monomer oil phase;

[0027](2) After the monomer oil phase and the aqueous dispersion are blended with a certain oil-water ratio (1:2-1:8), after high-speed shear suspension granulation, they are transferred to the reactor, and the temperature is raised for polymerization (temperature 60 -95°C, polymerization time 2-20 hours), so that the monomer oil droplet particles are completely converted into polymer particles, and a suspension dispersion of toner soft-core particles is obtained;

[0028] (3) Add the high Tg shell monomer to water containing an anionic surfactant at a concentration of 0.01-0.5% wt, form a high-Tg shell monomer emulsion with an avera...

Embodiment 1

[0074] 81 parts of styrene, 19 parts of n-butyl acrylate, 0.3 parts of divinylbenzene, 1.0 parts of n-dodecanethiol, 8 parts of carbon black (NP60, manufactured by Degussa), ester wax (WE-5, Manufactured by NOF Co., Ltd.) 10 parts, the above components were dispersed at room temperature with a bead mill to prepare a monomer oil phase. Further add 7 parts of tert-butyl peroxy-2-ethyl acetate, an oil-soluble initiator, and fully disperse for 30 minutes.

[0075] In addition, an aqueous solution of 100 parts of deionized water dissolved in 13 parts of magnesium chloride was slowly added to an aqueous solution of 200 parts of deionized water dissolved in 8.3 parts of sodium hydroxide, high-speed shear dispersion for 1 hour, and ultrasonic aging at room temperature for 4 hours to obtain magnesium hydroxide Suspension dispersion, wherein the remaining electrolyte magnesium chloride concentration is 1.0%wt of water.

[0076] Add the prepared monomer oil phase to the above-mentioned ...

Embodiment 2

[0082] In addition to changing 0.3 parts of methacryloyloxyethyltrimethylammonium chloride, 5 parts of methyl methacrylate, and 0.2 parts of 1,4-butanediol dimethacrylate into 4-dimethylaminostyrene Except for 0.5 parts of styrene, 4 parts of divinylbenzene, and 0.1 part of divinylbenzene, the same operation as in Example 1 was carried out to obtain the suspension polymerization toner of the present invention with an average particle diameter of 8.4 μm. Table 1 shows the obtained toner characteristic evaluation results.

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Abstract

Suspension polymerization toner of a core-shell structure with positive charges comprises core-shell composite particles prepared by mixing composition forming toner core particles with aqueous dispersion liquid, carrying out a heating polymerization reaction to obtain suspension dispersion liquid of toner soft core particles, and carrying out a water-based polymerization reaction to form rigid shell layers with dense positive charges coated on the soft core particles. A preparation method thereof comprises: mixing a monomer oil phase forming toner soft core resin with aqueous dispersion liquid; carrying out a heating polymerization reaction after suspension granulation to convert monomer oil droplet particles to suspension dispersion liquid of toner soft core particles; adding a high-Tg shell monomer into an anionic surfactant for emulsification; adding the emulsified shell monomer and a cationic monomer into the suspension dispersion liquid containing the soft toner core particles for secondary polymerization after mixing, and cleaning and filtering. According to the invention, the cationic monomer and the toner shell resin monomer with high reaction activity can react to form resin layers with dense positive charges on outer surfaces of the soft toner core particles, so that the obtained toner is excellent in imaging property, low-temperature fixation property and transfer printing property.

Description

【Technical field】 [0001] The invention relates to the field of toner manufacturing, in particular to a suspension polymerization toner having a positively charged core-shell structure for electrostatic charge image development through a suspension polymerization process and a method for preparing the toner. 【Background technique】 [0002] Toner is a developer material used in laser printers or photocopiers. The operation process of the printer is roughly as follows: the uniformly charged photosensitive drum surface is exposed to form an electrostatic latent image; the toner that is frictionally charged by the developing roller and the scraper develops the electrostatic latent image on the photosensitive drum surface to form an image; is attracted by the opposite charge on the paper surface, The image on the surface of the photosensitive drum is transferred to the paper, and then fixed by the heating roller and the pressure roller to get the printed image we need. [0003] I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/08
CPCG03G9/08G03G9/09392G03G9/0806G03G9/09307G03G9/09321G03G9/09328G03G9/0935G03G9/09364G03G9/09371
Inventor 刘志军张媛媛张欢孟鸿羊辉
Owner SHENZHEN LEPUTAI TECH CO LTD
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