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
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[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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