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Toner, developer, and image forming method

一种调色剂、单色图像的技术，应用在调色剂领域，能够解决调色剂粘附量大等问题，达到高质量图像、防止锐度、高分辨率的效果

Active Publication Date: 2009-04-22
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The toner adhesion amount in the Examples of the above patent specification is also large
In addition, in 3C, 3M, and 3Y in Examples of the above patent specification, the amount of each pigment added is 11% by mass, which is high, and thus has the same problem as above

Method used

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  • Toner, developer, and image forming method
  • Toner, developer, and image forming method
  • Toner, developer, and image forming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0311]

[0312] -Preparation of Fine Particle Dispersion 1-

[0313] In a reaction vessel equipped with a stirrer and a thermometer, 683 parts by mass of water, 11 parts by mass of sodium salt of methacrylate ethylene oxide adduct sulfate (ELEMINOL RS-30, manufactured by Sanyo Chemical Industries Ltd.), 83 parts by mass of styrene, 83 parts by mass of methacrylic acid, 110 parts by mass of butyl acrylate, and 1 part by mass of ammonium persulfate were stirred at 400 rpm (revolutions per minute) for 15 minutes to produce a white emulsion. The emulsion was heated and the temperature was raised to a system temperature of 75°C, and the reaction was carried out for 5 hours. Next, 30 parts by mass of a 1 mass % ammonium persulfate aqueous solution was added. The mixture was aged at 75°C for 5 hours to produce an aqueous dispersion of vinyl resin (copolymer of styrene-methacrylic acid-butyl acrylate-methacrylic acid ethylene oxide adduct sodium salt of sulfate) body [fine particl...

Embodiment 2

[0341]

[0342] Toner 2 was prepared in the same manner as in Example 1 except that the procedure for preparing the masterbatch was changed as follows.

[0343] -Preparation of masterbatch-

[0344] 1200 parts by mass of water, 405 parts by mass of C.I.PR269 (1022M, manufactured by DIC Corporation) as a colorant, 81 parts by mass of a polyurethane pigment dispersant (EFKA4080, manufactured by Chiba Specialty Chemicals, Inc.), and 1200 parts by mass of polyester resin The mixture of (1) was mixed with HENSCHELMIXER (manufactured by Mitsui Mining Co., Ltd.). After the mixture was kneaded at 150° C. for 30 minutes with a two-roll mill, the mixture was cold-rolled and pulverized in a pulverizer (manufactured by Hosokawa Micron Corporation) to prepare a masterbatch.

Embodiment 3

[0346]

[0347] Toner 3 was prepared in the same manner as in Example 1 except that the procedure for preparing the masterbatch was changed as follows.

[0348] -Preparation of masterbatch-

[0349] With 1200 parts by mass of water, 540 parts by mass of C.I.PY155 (YELLOW4G-PT VP2669, manufactured by Clariant (Japan) K.K.) as a colorant, 108 parts by mass of polyester pigment dispersant (AJISPER821, Ajinomoto Fine-Techno Co., Inc.), 16 parts by mass of builder (EFKA6750, manufactured by Chiba Specialty Chemicals, Inc.), and 1200 parts by mass of polyester resin (1) were mixed with HENSCHEL MIXER (manufactured by Mitsui Mining Co., Ltd.). After the mixture was kneaded at 150° C. for 30 minutes with a two-roll mill, the mixture was cold-rolled and pulverized in a pulverizer (manufactured by Hosokawa Micron Corporation) to prepare a masterbatch.

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PUM

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Abstract

The invention relates to a toner, a developer, and an image forming method. The present invention provides a toner containing at least a binder resin and a pigment, wherein the amount of the pigment in the toner is 3.0% by mass to 8.5% by mass, the volume average particle diameter of the toner is 2.0 mum to 6.0 mum, and a monochrome image, which has been fixed on a recording medium so that the amount of the toner adhered onto the recording medium is 0.25 mg / cm<2>, has a reflection density of 1.2 to 2.5.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic latent image in an electrophotographic copier, a laser printer, a facsimile machine, etc. and suitable for forming a color image, and to a developer and a developer respectively using the toner Imaging method. Background technique [0002] In a color electrophotographic image forming apparatus, in order to produce an image density (ID; reflection density of a toner image on paper) of 1.2 in a monochromatic color image of each of cyan (C), magenta (M), and yellow (Y), Usually 0.4mg / cm is required 2 (4.0g / m 2 ) or higher toner adhesion amount (the amount of toner adhesion per unit area of ​​the recording medium). [0003] In recent years, environmental problems have been required to be solved in many industrial fields, however, it is difficult to reduce the adhesion amount of toner in the electrophotographic industry, leaving such environmental problems unsolved. [0004] Also, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/09G03G9/087G03G13/00
CPCG03G9/0806G03G9/0819G03G9/0823G03G9/08793G03G9/08726G03G9/08755G03G9/08764G03G9/0821G03G9/0804
Inventor 若松慎一山下裕士渡边真弘杉本强
Owner RICOH KK
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