Electrophotographic toner and manufacturing method thereof, polyester resin for electrophotographic toner and manufacturing method thereof, electrophotographic developer and image forming method

A technology of electrophotography and polyester resin, applied in the direction of developer, electric recording process using charge pattern, electric recording process using charge pattern, etc., can solve the problem of poor long-term storage of images, difficulty in recycling and reusing catalysts, fixing strength Poor and other problems, to achieve the effect of easy recycling and reuse, excellent long-term image storage, high fixing strength

Active Publication Date: 2005-11-16
FUJIFILM BUSINESS INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when these methods are used to produce high-molecular-weight polymers necessary for imparting viscoelasticity and durability to toners, there are problems in that high temperature (150° C. or higher) and low vacuum reaction conditions are required, and during the reaction Difficult to recover and reuse catalysts after
However, this toner was found to be disadvantageous in that it was poor in long-term storage of images
In addition, it was also found that the fixing strength becomes poor because of the presence of low molecular weight components in the polyester resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0134] Preparation of Polyester Resin Particle Dispersion

[0135] The particle dispersion of the polyester resin can be formed by applying a shear force to a liquid in which an aqueous medium and a sulfonated polyester resin are mixed.

[0136] At that time, when the polyester resin is heated or dissolved in an organic solvent, the viscosity of the polymer solution can be reduced, whereby emulsified particles can be formed. Furthermore, in order to stabilize the emulsified particles and increase the viscosity of the aqueous medium, a dispersant may be used.

[0137] Examples of dispersants include: water-soluble polymers such as polyvinyl alcohol, methylcellulose, ethylcellulose, hydroxyethylcellulose, carboxymethylcellulose, sodium polyacrylate or sodium polymethacrylate; surface active agents such as anionic surfactants such as sodium dodecylbenzenesulfonate, sodium stearyl sulfate, sodium oleate, sodium laurate or potassium stearate; cationic surfactants such as laurylami...

Embodiment 1-1

[0204] Synthetic Crystalline Polyester Resin 1-(1)

[0205] In a flask mix 200 parts of 1,9-nonanediol, 260 parts of 1,12-dodecanedicarboxylic acid, 7.4 parts of dimethyl 5-sulfoisophthalate, 21 parts of 5-tert-butylisophthalic acid Diformic acid and 12.6 parts of scandium trifluoromethanesulfonate as a catalyst were subjected to nitrogen substitution, and the temperature was raised to 100° C. to dissolve these substances. The temperature was maintained at 100°C and the flask was depressurized to 20 mm Hg pressure over 1 hour with stirring. Further, the pressure was further lowered to 10 mmHg or less, followed by continuing the reaction in this state for 7 hours, whereby a resin was obtained. The weight average molecular weight (Mw) was 20000.

[0206] Production of electrophotographic toner 1-(1)

[0207] In the emulsification device (trade name: ULTRA-TURRAX  , produced by Junke and Kunkel IKA Labortechnic), stirred 10 parts by mass of the obtained crystalline polyester...

Embodiment 1-2

[0210] Synthetic Crystalline Polyester Resin 1-(2)

[0211] Crystalline polyester resin 1-(2) was prepared in a manner similar to the synthesis of crystalline polyester resin 1-(1) in Example 1-1, except that the catalyst was changed to 0.126 parts of scandium trifluoromethanesulfonate , making the resin constitution similar to that of Example 1-1. Its weight average molecular weight (Mw) was 21000.

[0212] Production of electrophotographic toner 1-(2)

[0213] Electrophotographic toner 1-(2) was prepared in a similar manner to "Production of electrophotographic toner 1-(1)" in Example 1-1, except that the polyester resin was replaced by crystalline polyester Resin 1-(2).

[0214] The average particle diameter of the electrophotographic toner thus obtained was measured using a Coulter counter (trade name: TA-II type, aperture diameter: 50 μm, produced by Beckman Coulter Co., Ltd.) to obtain the average particle diameter thereof. The diameter is 5.7 μm. When the toner was...

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Abstract

The present invention provides a binder resin that is used for an electrophotographic toner, an electrophotographic toner using the same, and a manufacturing method thereof, as well as an electrophotographic developer and an image forming method. The binder resin includes a rare earth element in a range of about 1 to 10000 ppm and is preferably made of a polyester resin. The polyester resin is preferably synthesized from from an acid unit having a dicarboxylic acid group and an alcohol unit having a diol group by use of a non-homogeneous catalyst in which a rare earth metal triflate or a rare earth metal triflylimide is carried on a carrier.

Description

technical field [0001] The present invention relates to a binder resin for electrophotographic toner, an electrophotographic toner using the binder resin, a production method thereof, an electrophotographic developer and an image forming method, the electrophotographic toner The agent can be used in an electrophotographic apparatus such as a copying machine, a printer, or a facsimile machine using an electrophotographic method. Background technique [0002] Many electrophotographic methods are known (for example, see Japanese Patent Publication Sho 42-23910). Generally, an electric latent image is formed on the surface of a photoreceptor (latent image holder) using a photoconductive material through multiple processes using various means, and then the formed latent image is developed using a toner to form a toner. After the toner image is formed, the toner image on the surface of the photoreceptor is transferred to the surface of a transfer-receiving material such as paper ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/087C08G63/84C08J3/16
Inventor 平冈智山本保夫前畑英雄松村保雄
Owner FUJIFILM BUSINESS INNOVATION CORP
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