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Toner and method for producing toner

A toner and colorant technology, applied in the direction of developer, instrument, electrography, etc., can solve the problems of reduced toner elasticity, unstable charge amount, and fragility of toner, and achieve sufficient mechanical strength and charging Excellent stability and excellent heat-fouling resistance

Active Publication Date: 2011-12-14
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the toner produced by the method disclosed in JP 2008-122509 A becomes weak when the rosin content in the resin composition is increased in order to improve the utilization rate of biomass.
When such a toner is used as a developer, due to the stress generated by stirring in the developing tank, etc., there are problems that the toner is broken, fine powder is generated, the charge amount becomes unstable, and the elasticity of the toner decreases, thereby prone to thermal fouling

Method used

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  • Toner and method for producing toner
  • Toner and method for producing toner
  • Toner and method for producing toner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0137] [Preparation of polyester resin A1]

[0138] 305 g of terephthalic acid, 55 g of isophthalic acid, and disproportionated rosin (acid value 157.2 mgKOH / g) were charged into a reaction vessel equipped with a stirring device, a heating device, a thermometer, a cooling pipe, a fractionation device, and a nitrogen introduction pipe. ) 1400g and trimellitic anhydride 30g, glycerin 300g and 1,3-propanediol 150g as the alcohol component, tetra-n-butyl titanate 1.79g as the reaction catalyst (relative to the total amount of the acid component and the alcohol component 100 parts by weight, equivalent to 0.080 parts by weight). These raw materials were stirred under a nitrogen atmosphere, the generated water was distilled off, and the polycondensation reaction was carried out at 250° C. for 10 hours. After the flow tester confirmed that the specified softening temperature was reached, the reaction was terminated to obtain polyester resin A1 ( Glass transition temperature 60°C, so...

Embodiment 2

[0154] [Preparation of polyester resin A2]

[0155] Except that terephthalic acid and trimellitic anhydride were not used, 355 g of isophthalic acid and 1530 g of disproportionated rosin (acid value 157.2 mgKOH / g) were used as acid components, and only 280 g of glycerin was used as alcohol components, the same procedure as in Example 1 was carried out. Polyester resin A2 (glass transition temperature 55° C., softening temperature 111° C., weight average molecular weight 2520, Mw / Mn=1.9, acid value 11 mgKOH / g, THF insoluble content 0%) was obtained.

[0156] A toner of Example 2 (volume average particle diameter of 6.7 μm, CV value of 25%) was obtained in the same manner as in Example 1, except that polyester resin A2 was used instead of polyester resin A1 in the mixing step S1.

Embodiment 3

[0158] [Preparation of polyester resin A3]

[0159] Instead of trimellitic anhydride, 230 g of terephthalic acid, 230 g of isophthalic acid, and 1,350 g of disproportionated rosin (acid value 157.2 mgKOH / g) were used as acid components, and 330 g of glycerin and 30 g of 1,3-propanediol were used as alcohol components. The same operation as in Example 1 was performed to obtain polyester resin A3 (glass transition temperature 65° C., softening temperature 124° C., weight average molecular weight 5850, Mw / Mn=4.3, acid value 10 mgKOH / g, THF insoluble content 0%).

[0160] A toner of Example 3 (volume average particle diameter 6.7 µm, CV value 24%) was obtained in the same manner as in Example 1, except that polyester resin A3 was used instead of polyester resin A1 in the mixing step S1.

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PUM

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Abstract

The present invention provides a toner and a method for manufacturing the same. The toner includes a binder resin and a colorant. The binder resin contains a polyester resin A obtained by subjecting aromatic dicarboxylic acid, rosin, and trivalent or higher-valent alcohol as starting materials to polycondensation, a content of the rosin in a sum of the starting materials being 60% by weight or more, and a polyester resin B obtained by subjecting aromatic dicarboxylic acid and polyhydric alcohol as starting materials to polycondensation, the polyester resin B having a viscosity of 103 Pa*s or more and 105 Pa*s or less at a softening temperature of the polyester resin A, the polyester resin B being contained in an amount of 50 parts by weight or more and 200 parts by weight or less relativeto 100 parts by weight of the polyester resin A.

Description

technical field [0001] The present invention relates to a toner and a method for producing the toner. Background technique [0002] A toner for visualizing a latent image is used in various image forming processes, for example, in an electrophotographic image forming process. [0003] In an image forming apparatus using an electrophotographic image forming process, a desired image is generally formed on a recording medium through the process of uniformly charging the photosensitive layer on the surface of the photosensitive drum as a latent image carrier. process; exposure process of projecting the signal light of the original image on the surface of the photosensitive drum in a charged state to form an electrostatic latent image; development process of supplying electrophotographic toner to the electrostatic latent image on the surface of the photosensitive drum to visualize it; The transfer process of transferring the toner image on the surface of the photosensitive drum ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/087G03G9/08
CPCG03G9/08797G03G9/08748G03G9/081G03G9/08775G03G9/08755G03G9/08795
Inventor 有好智芝井康博前泽宜宏松本香鹤
Owner SHARP KK
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