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Polyester resin for toner, method for producing polyester resin for toner, and toner

一种聚酯树脂、制造方法的技术，应用在显影剂、仪器、电记录术等方向，能够解决安全担忧、耐粘连性、带电特性等调色剂特性损害、调色剂特性不良影响等问题，达到低温固定性优异的效果

Active Publication Date: 2017-08-29
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in Conventional Document 1, dibutyltin oxide is used as a polymerization catalyst, and there are concerns about safety.
In addition, in prior art 1, the desired resin cannot be obtained due to gelation, and in the case of obtaining the desired resin, a long polycondensation reaction time is required, and there is room for improvement as the production conditions.
On the other hand, Conventional Document 2 only shows an example in which no aromatic diol is used as an alcohol component and only ethylene glycol is used, and there is concern about damage to toner characteristics such as blocking resistance and charging characteristics.
In addition, in such a molecular structure, a part tends to have a crystal structure, and there is a concern that it may adversely affect the characteristics of the toner.

Method used

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  • Polyester resin for toner, method for producing polyester resin for toner, and toner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0148] The polyhydric carboxylic acid and polyhydric alcohol of the addition composition shown in Table 1 were put into the reaction container equipped with the distillation column. Next, the rotation speed of the stirring blade in the reaction container was kept at 200 rpm, the temperature was raised, and the temperature in the reaction system was heated to 265° C., and the temperature was maintained. The esterification reaction was carried out until water no longer distilled from the reaction system.

[0149] Next, reduce the temperature in the reaction system to adjust to the polycondensation reaction temperature shown in Table 1. After collecting a small amount of the contents, reduce the vacuum in the reaction vessel to below 1 kPa for about 20 minutes, while allowing the diol component to escape from the reaction system. Distillation while carrying out polycondensation reaction. Continue the reaction directly while maintaining a high vacuum state, the viscosity of the r...

Embodiment 2)～( Embodiment 6

[0152] (Example 2) to (Example 6), (Comparative Example 4)

[0153] The polycarboxylic acid and polyhydric alcohol added to the reaction container were changed as shown in Table 1, except that, the polyester resin was obtained by the same method as in Example 1, and the toner was prepared by the same method as in Example 1. change. Table 1 shows the characteristic values ​​of the obtained resin and the evaluation results of the toner.

Embodiment 7

[0155] The polyvalent carboxylic acid and polyhydric alcohol charged into the reaction container were changed as shown in Table 1, and the polymerization catalyst shown in Table 1 was added together with the raw materials, and polyester was obtained by the same method as in Example 1. The resin was converted into a toner by the same method as in Example 1. Table 1 shows the characteristic values ​​of the obtained resin and the evaluation results of the toner.

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Abstract

The present invention pertains to: a polyester resin for toner to be used in the development of an electrostatic image or magnetic latent image in electrophotography, electrostatic recording, electrostatic printing, or the like; a method for producing a polyester resin for toner; and a toner, the purpose of the present invention being to stably and productively provide a polyester resin for toner having exceptional storage stability, hot offset resistance, and low temperature fixing properties in consideration of environmental protection and safety. A polyester resin for toner containing from 40 mol% to 60 mol% of structural units derived from trivalent or higher carboxylic acids, where the total of structural units derived from all acid components is 100 mol%, and having a metal content of 100 ppm or less.

Description

technical field [0001] The present invention relates to a polyester resin for toner, a method for producing the polyester resin for toner, and a toner. [0002] this application claims priority based on Japanese Patent Application No. 2015-009929 for which it applied to Japan on January 22, 2015, and uses the content here. Background technique [0003] In the method of obtaining an image by the electrophotographic printing method and the electrostatic charge developing method, the electrostatic charge image formed on the photoreceptor is developed with a toner previously charged by friction, and then fixed. Regarding the fixing method, there are a hot roller method in which a toner image obtained by development is fixed using a pressed and heated roller, and a non-contact fixing method in which an electric oven or a flash beam is used to fix it. In order to pass through these processes without problems, the toner firstly needs to maintain a stable charge amount, and secondl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/133G03G9/087
CPCC08G63/133C08G63/78G03G9/08755G03G9/08795G03G9/08797C08G63/672
Inventor 田村阳子小泽匡弘近藤晃史
Owner MITSUBISHI CHEM CORP
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