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Toner and method of forming image by utilizing such toner

A technology of toner and image, applied in the field of toner, can solve the problems of rough image and poor image quality, etc.

Inactive Publication Date: 2004-03-10
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conversely, the larger the granularity, the rougher the image and the worse the image quality

Method used

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  • Toner and method of forming image by utilizing such toner
  • Toner and method of forming image by utilizing such toner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 10

[0078]

[0079] 20-30 parts by weight of 5-methoxysalicylate and 20-30 parts by weight of 25% aqueous sodium hydroxide solution are dissolved in 300-400 parts by weight of water, and the resulting mixture is heated at a speed of 5-15° C. / min to 50° C., then drop an aqueous zirconium oxychloride (zirconium oxychloride) solution into the mixture while stirring, and the aqueous solution is obtained by dissolving 15-25 parts by weight of zirconium oxychloride in 80-100 parts by weight of water. After the mixture was stirred at the same temperature for 1 hour, it was cooled to room temperature at a rate of 5-15°C / min. Add 5-8 parts by weight of 25% sodium hydroxide aqueous solution to the mixture to adjust the pH value to 7.5-8.0. The precipitated crystals are filtered, washed with water and dried to obtain 20-35 parts by weight of a white crystalline zirconium compound.

[0080] The measurement results of X-ray diffraction, average particle size and electrical conductivit...

Embodiment 11 and 12

[0103] In order to prepare the toner of Example 11, the preparation process of Examples 1-10 was repeated, except that 100 parts by weight of styrene-n-butyl acrylate copolymer was replaced by polyester with an acid value of 20 mgKOH / g 100 parts by weight of resin, and the toner of Example 12 was prepared by replacing 50 parts by weight of styrene-n-butyl acrylate copolymer with 50 parts by weight of polyester resin with an acid value of 20 mgKOH / g. Before the toner preparation described above is carried out, the toner is first subjected to measurement and image evaluation. The results are shown in Table 1.

Embodiment 13 to 15

[0105] In order to prepare the toners of Examples 13 to 15, the preparation process of Examples 1-10 was repeated, except that 100 parts by weight of styrene-n-butyl acrylate copolymer was replaced by 20 parts by weight of styrene- 80 parts by weight of a n-butyl acrylate copolymer and a polyester resin having an acid value of 15 mgKOH / g, and similarly, charge control agent 1 was replaced by charge control agent 2 below. Before the toner preparation described above is carried out, the toner is first subjected to measurement and image evaluation. The results are shown in Table 1.

[0106] 30-40 parts by weight of 3,5-dibutyl salicylic acid and 15-28 parts by weight of 25% aqueous sodium hydroxide solution are dissolved in 300-400 parts by weight of water, and the resulting mixture is heated at a speed of 5-15°C / min to 50° C., and then drop an aqueous solution of zirconium oxychloride into the mixture while stirring. The aqueous solution is obtained by dissolving 15-26 pa...

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PUM

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Abstract

A toner including at least a binder resin; a colorant; and a zirconium compound including zirconium and at least one of an aromatic oxycarboxylic acid and a salt thereof, wherein the zirconium compound has a main diffraction peak (A) at a Bragg (2[theta]) angle of 5.5+ / -0.3 DEG and a diffraction intensity of from 2,000 to 15,000 cps when irradiated with a specific X-ray of CuK alpha .

Description

technical field [0001] The present invention relates to a toner and a method of forming an electrophotographic image using the toner. Background technique [0002] Hitherto, many methods of forming images using the electrophotographic image method have been proposed. Among these methods, a developing method in a method for forming an image can be roughly classified into a dry developing method and a wet developing method. The dry imaging method is further divided into a single-component imaging method and a two-component imaging method. The toner used in both methods must have a positive or negative charge corresponding to the polarity of the electrostatic latent image. [0003] In order to ensure that the toner is charged, it is preferable to add a charge control agent. Among them, a colorless or white charge control agent is indispensable for colored toners. For example, specific examples of colorless or white charge control agents are disclosed in JP-A-55-42752, JP-A-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/097
CPCG03G9/09783
Inventor 长谷川久美青木三夫
Owner RICOH KK
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