Toner

一种调色剂、着色剂的技术，应用在调色剂领域，能够解决无法实现、清洁稳定性不足等问题

Active Publication Date: 2015-04-08
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, although such an approach focusing on various indicators is expected to provide a certain degree of improvement, basic solutions to the above-mentioned problems cannot be achieved due to insufficient cleaning stability in harsh conditions such as low-temperature environments during long-term use.

Method used

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  • Toner
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0286] The following describes the present invention more completely with the help of working examples and comparative examples, but the present invention is by no means limited by this. Unless otherwise stated, all parts and% involved in the working examples and comparative examples are calculated by mass.

preparation example

[0288] The aqueous solution containing ferrous hydroxide is prepared by mixing the following in an aqueous solution of ferrous sulfate: 1.00-1.10 equivalent of sodium hydroxide solution (based on elemental iron), P corresponding to an amount of 0.15% by mass 2 O 5 (Based on elemental phosphorus relative to elemental iron), and SiO corresponding to an amount of 0.50% by mass 2 (Based on elemental silicon versus elemental iron). The pH of the aqueous solution was set to 8.0 and the oxidation reaction was carried out at 85°C while blowing air, thereby preparing a slurry containing seed crystals.

[0289] Next, an aqueous solution of ferrous sulfate is added to the slurry in an amount corresponding to 0.90-1.20 equivalents with respect to the initial amount of alkali (sodium component of sodium hydroxide). Then, the slurry was maintained at pH 7.6 and the oxidation reaction was allowed to proceed while blowing air to obtain a slurry containing magnetic iron oxide. After filtering and...

Embodiment 1

[0388] HP LASERJET P2055 (from Hewlett Packard) was used as the image forming device. Because of the use of more severe evaluation conditions, the cleaning blade has changed from a cleaning blade with a rubber hardness of 70° and a linear pressure of 397 mN / cm to the center of the entire side wall and the longitudinal direction of the end face to a rubber with 50° The cleaning blade with hardness and linear pressure of 300mN / cm. In addition, by remodeling the cartridge, the added amount of toner in the cartridge is doubled.

[0389] [Evaluation of cleanliness]

[0390] Using this modified equipment and using the toner 1 for the example, the test was conducted under harsher evaluation conditions of a low temperature and low humidity environment (0° C. / about 15% RH). In a low temperature and low humidity environment, the cleaning blade becomes hard, making it difficult to stably scrape the surface of the electrostatic latent image bearing member. The case where the image printout ...

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PUM

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Abstract

Disclosed is a toner which enables a stable image density to be obtained, regardless of the service environment, throughout use in durability tests, and which is able to suppress the occurrence of faulty cleaning. The toner contains both toner particles, which include a binder resin and a colorant, and also silica fine particles. The toner has an average circularity of at least 0.950, a static friction coefficient, with respect to a polycarbonate resin substrate, of at least 0.100 and not more than 0.200, and a coverage ratio X1 of the toner surface by the silica fine particles, as determined by X-ray photoelectron spectroscopy (ESCA), of at least 50.0 area %, and not more than 75.0 area %.

Description

Technical field [0001] The present invention relates to toners used in, for example, electrophotographic methods, electrostatic recording methods, and magnetic recording methods. Background technique [0002] In monochrome copiers and laser beam printers (hereinafter also referred to as "LBP"), one-component developing systems using magnetic toners have been widely used, mainly because of the advantages of cost and simple equipment configuration. Various researches on both the toner and its own devices are currently in progress, which aim to achieve even higher image quality in such monochrome copiers and LBPs. In order to improve the image quality of monochromatic copiers and LBP, approaches taken from the viewpoint of toner include small particle size of toner particles, sharpening of particle size distribution, and increased circularity. [0003] When the toner has a smaller particle size, the resolution increases, and a high-definition image can be obtained. When the toner ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/087
CPCG03G9/0827G03G9/09725G03G9/08757G03G9/0821
Inventor 野村祥太郎长谷川雄介松井崇广子就一铃村祯崇大森淳彦
Owner CANON KK
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