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Process for producing toner for electrophotography

一种制造方法、电子照相的技术，应用在显影剂、电记录术、光学等方向，能够解决没有调色剂带电发生部位、易带电等问题

Active Publication Date: 2008-06-11
KAO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The toner obtained by the melt kneading and pulverization method has an indeterminate shape with concave and convex parts, so it is easy to be charged
However, since the toner obtained by the chemical method is spherical in shape, there are almost no charging generation sites of the toner itself, and it is necessary to make the charge control agent locally exist on the surface of the toner.

Method used

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  • Process for producing toner for electrophotography

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0179] Production example 1 (manufacture of polyester A)

[0180] Polyoxypropylene (2.2)-2,2-bis(4-hydroxyphenyl)propane 8320g, polyoxyethylene (2.0)-2,2-bis(4-hydroxyphenyl)propane 80g, terephthalic acid 1592g And 32g of dibutyltin oxide (esterification catalyst) was added into a four-necked flask equipped with a nitrogen inlet tube, a dehydration tube, a stirrer and an electric thermocouple, in a nitrogen atmosphere, at 230°C under normal pressure (101.3kPa) The reaction was carried out under reduced pressure for 5 hours, and then further reacted under reduced pressure. After cooling to 210° C., 1672 g of fumaric acid and 8 g of hydroquinone were added, and reacted for 5 hours, polyester resin A was obtained by further reacting under reduced pressure. The softening point of polyester A was 110° C., the glass transition point was 66° C., the acid value was 24.4 mgKOH / g, and the number average molecular weight was 3,760.

manufacture example 2

[0181] Production example 2 (manufacture of polyester B)

[0182] Polyoxypropylene (2.2)-2,2-bis(4-hydroxyphenyl)propane 1750g, polyoxyethylene (2.0)-2,2-bis(4-hydroxyphenyl)propane 1625g, terephthalic acid 1145g , 161g of dodecenyl succinic anhydride, 480g of trimellitic anhydride and 26g of tin 2-ethylhexanoate were added to a four-necked flask equipped with a nitrogen inlet tube, a dehydration tube, a stirrer and a thermocouple, and in a nitrogen atmosphere at 220 The polyester resin B was obtained by stirring and reacting until the softening point measured in accordance with ASTM D36-86 was 120°C. Polyester B had a softening point of 121° C., a glass transition point of 65° C., an acid value of 21 mgKOH / g, and a number average molecular weight of 3,394.

manufacture example 3

[0183] Manufacturing Example 3 (Manufacturing of Master Batch A)

[0184] Add 70 parts by weight of fine powder of polyester A obtained in Production Example 1 and 30 parts by weight of a copper phthalocyanine slurry pigment (ECB-301: solid content 46.2% by weight) manufactured by Dainippon Seika Chemical Co., Ltd. Mix in mixer for 5 minutes to moisten. Then, the mixture was put into a kneading mixer and slowly heated. The resin is melted at about 90-110°C, kneaded in the presence of water, and kneaded continuously at 90-110°C for 20 minutes while evaporating the water.

[0185] Then, kneading was continued at 120° C. to evaporate the remaining water, and then dehydrated and dried. Furthermore, kneading was continued for 10 minutes under the condition of 120-130 degreeC. After cooling, kneading, cooling, and coarse crushing were performed with a heated three-roll mill to obtain a coarsely crushed product (masterbatch A) of a high-concentration coloring composition containin...

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Abstract

A method for producing a toner for electrophotography, comprising: (A) a step of obtaining core particles having a resin-containing volume median particle size (D50) of 1 to 10 μm in an aqueous medium; (A) Composite microparticles containing polyester-containing resin and charge control agent are added to the obtained core particles, or composite microparticles comprising charge control agent microparticles and polyester-containing resin microparticles are added and attached, Thereby obtaining the core particle to which the composite fine particle is attached, and (C) the process of heating the core particle to which the composite fine particle was obtained in the process (B), and obtaining an agglomeration particle. The present invention provides a method for producing a toner for electrophotography having a small particle size and a narrow particle size distribution in which a charge control agent is present on the surface of the toner, and a toner for electrophotography that is excellent in image characteristics obtained by the production method agent.

Description

technical field [0001] The present invention relates to a toner for electrophotography used in electrophotography, electrostatic recording, electrostatic printing, and the like, and a method for producing the same. Background technique [0002] In the field of toners for electrophotography, along with the development of electrophotographic systems, the development of toners corresponding to higher image quality and higher speed is required. From the viewpoint of high image quality, it is necessary to reduce the particle size of the toner, and a so-called chemical method obtained by a chemical method such as a polymerization method and an emulsification dispersion method has been proposed instead of the conventional melt kneading and pulverization method. For toners, attention is paid to the small particle size and narrow particle size distribution. [0003] The toner obtained by the melt-kneading / pulverization method has an indeterminate shape having concavo-convex parts, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/097
CPCG03G9/0825G03G9/09392G03G9/09371G03G9/0819G03G9/08755G03G9/0804
Inventor 神吉伸通铃木学村井丰
Owner KAO CORP
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