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Toner, developer, image forming apparatus, process cartridge, and image forming method

A technology of toner images and toners, which is applied in the field of toners, can solve problems such as unclear dispersion states, and achieve the effects of excellent preservation, improved heat offset resistance, and improved adhesion and agglomeration resistance

Inactive Publication Date: 2006-02-22
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the detailed dispersion state of the wax near the toner surface is unclear.

Method used

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  • Toner, developer, image forming apparatus, process cartridge, and image forming method
  • Toner, developer, image forming apparatus, process cartridge, and image forming method
  • Toner, developer, image forming apparatus, process cartridge, and image forming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0243] (Synthesis of Organic Microparticle Emulsion)

[0244]In a reaction vessel equipped with a stirring bar and a thermometer, 683 parts of water, 11 parts of sodium salt of methacrylic acid ethylene oxide adduct sulfate (Eleminol RS-30, manufactured by Sanyo Chemical Industries), 83 parts styrene, 83 parts of methacrylic acid, 110 parts of butyl acrylate, and 1 part of ammonium persulfate were stirred at 3800 rpm for 30 minutes to obtain a white emulsion. Heated to raise the temperature to 75°C in the system and reacted for 4 hours. Then add 30 parts of 1% ammonium persulfate aqueous solution, and ripen at 75°C for 6 hours to obtain the sodium salt of vinyl resin (styrene-methacrylic acid-butyl acrylate-methacrylic acid oxyethylene adduct sulfuric acid ester) Copolymer of ) aqueous dispersion "fine particle dispersion 1". The volume average particle diameter of the "fine particle dispersion 1" measured with a laser diffraction / scattering particle size distribution analyz...

Embodiment 2

[0270] A toner was obtained in the same manner as in Example 1, except that in Example 1, the production process of the oil phase was changed to the following conditions. The physical properties of the obtained "toner 2" are shown in Table 1, and the evaluation results are shown in Table 2.

[0271] (manufacture of oil phase)

[0272] In a container equipped with a stirring rod and a thermometer, put 378 parts of "low-molecular polyester 1", 100 parts of carnauba / rice wax (7:3 by weight), 947 parts of ethyl acetate, and heat up to 80 under stirring. °C, after keeping at 80°C for 4 hours, it was cooled to 30°C over 1 hour. Next, 500 parts of "color masterbatch 1" and 500 parts of ethyl acetate were added to the container, and mixed for 1 hour to obtain "raw material solution 2".

[0273] 1324 parts of "raw material solution 2" were transferred to a container, and a glass bead mill (Bizmill) (Ultrabisucomil: manufactured by Aimex Co., Ltd.) was used at a liquid feeding rate of...

Embodiment 3

[0275] A toner was obtained in the same manner as in Example 1, except that in Example 1, the production process of the oil phase was changed to the following conditions. The physical properties of the obtained "toner 3" are shown in Table 1, and the evaluation results are shown in Table 2.

[0276] (manufacture of oil phase)

[0277] In a container equipped with a stirring rod and a thermometer, put 378 parts of "Low Molecular Polyester 1", 400 parts of palm wax, and 947 parts of ethyl acetate, heat up to 80°C under stirring, and keep at 80°C for 4 hours , cooled to 30°C for 1 hour. Next, add 500 parts of "color masterbatch 1" and 500 parts of ethyl acetate into the container, and mix for 2 hours to obtain "raw material solution 3".

[0278] 1324 parts of "raw material solution 3" were transferred to a container, and a glass bead mill (Bizmill) (Ultrabisucomil: manufactured by Aimex Corporation) was used at a liquid feeding rate of 1 kg / hr, a peripheral speed of 6 m / sec, an...

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PUM

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Abstract

A toner wherein the state of wax dispersion in the vicinity of the surface thereof is controlled so as not only to enhance hot offset resistance to thereby realize favorable fixability but also to enhance antiblocking properties to thereby realize excellent long-term storability. In particular, a toner comprising at least a binder resin, a colorant and a wax, characterized in that the content of wax in terms of the value, expressed by weight, wax endotherm determined in accordance with DSC (Differential Scanning Calorimetry) is in the range of 3 to 21 wt.% based on the total toner weight; the intensity ratio of (P2850 / P828) wherein P2850 represents the intensity of peak (2850 cm<-1>) ascribed to the wax while P828 represents the intensity of peak (828 cm<-1>) ascribed to the binder resin as determined in accordance with FTIR-ATR (Fourier Transform Infra-Red Attenuated Total Reflection) spectroscopy, as a value defining the amount of wax being present in a region extending from the surface of toner particle to a depth of 0.3 mum, is in the range of 0.01 to 0.40; and at least portion of the wax is present in the form of multiple independent wax disperse subparticles encapsulated in the toner particles.

Description

technical field [0001] The present invention relates to toners used for image formation in electrophotographic processes of copiers, facsimile machines, printers, and the like. Background technique [0002] In an electrophotographic image forming apparatus, a charging process of supplying electric charges by discharging on the surface of a photoreceptor as an image carrier, an exposure process of exposing the surface of a charged photoreceptor to form an electrostatic latent image, and supplying and A developing step in which the electrostatic latent image formed on the surface of the photoreceptor is developed with a toner of opposite polarity to form a toner image on the photoreceptor. The toner image formed on the photoreceptor is then temporarily transferred to an intermediate transfer body, and then transferred from the intermediate transfer body to a recording element such as paper, or directly transferred from the photoreceptor to a recording element In the transfer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/087
CPCG03G9/0825G03G9/08782
Inventor 杉浦英树望月贤岩本康敬朝比奈安雄梅村和彦市川智子中山慎也内海知子坂田宏一
Owner RICOH KK
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