Spherical silica fine powder and toner external additive for electrostatic image development using spherical silica fine powder
A technology of electrostatic image development and external additives, which is applied in the direction of developer, silicon oxide, electrography, etc., can solve the problems of poor image condition and reduced transfer performance, and achieve the effect of excellent spacing effect and stable printing characteristics
Active Publication Date: 2016-08-24
DENKA CO LTD
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Problems solved by technology
Regarding the specific surface area of silica fine powder, use 200-500m 2 / g ultrafine powder, but it is confirmed that in the process of repeated image formation, the silica ultrafine powder is buried on the surface of the toner particles, and the fluidity, triboelectric charge, transfer performance, etc. of the toner are reduced cause bad image state
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Embodiment 1～13 comparative example 1～8
[0050] Spherical silica powder is produced by a device that is equipped with an LPG-oxygen mixed burner with a double-tube structure capable of forming an inner flame and an outer flame on the top of the combustion furnace, and directly connected to a collection line at the bottom. A two-fluid nozzle for slurry spraying is also provided at the central part of the above-mentioned burner, and the metal silicon powder (average particle diameter is 9.8 μm, Na ＋ Concentration: 0.2ppm, Cl － Concentration: 0.4ppm) and water to form a slurry. Oxygen is supplied from the surroundings. The formation of the flame is realized by setting dozens of fine holes at the outlet of the double tube burner and injecting the mixed gas of LPG and oxygen from the fine holes. The spherical silica fine powder sprayed from the two-fluid nozzle and passed through the flame is air-transported in the collection line under the action of the blower and collected by the bag filter. In addition, the adjustme...
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Abstract
To provide an external additive for toner that is excellent in spacer effect, does not cause poor image state even in repeated image formation, and is suitable for preparing a toner having stable printing characteristics. In addition, spherical silica fine powder suitable for addition in such toner external additives is provided. The spherical silica fine powder is characterized in that the average particle diameter measured by a laser diffraction scattering particle size distribution measuring instrument is 0.090 μm to 0.140 μm, and the content of particles with a particle diameter of 0.150 μm or more is 5.0% by mass or more and 25.0% by mass or less , the content of particles having a particle size of 0.300 μm or more is 1.0% by mass or less. Preferably, the content of particles with a particle diameter of 0.050 μm or less measured by a laser diffraction scattering particle size distribution measuring instrument is 0.5% by mass or less, and the content of particles with a particle diameter of more than 0.050 μm and 0.080 μm or less is 1.0% by mass or more 15.0% by mass or less.
Description
technical field [0001] The present invention relates to a fine spherical silica powder and an external additive for toner for developing an electrostatic image using the fine spherical silica powder. Background technique [0002] Conventionally, in toners for developing electrostatic images used in digital copiers and laser printers, surface-treated silica fine powders have been used as external toner additives in order to improve fluidity and stabilize charging characteristics. The characteristics required of the above-mentioned silica fine powder are high hydrophobicity in order to reduce the change in charge amount due to humidity, and low aggregation and high dispersion in order to uniformly coat the surface of the toner. Regarding the specific surface area of silica fine powder, use 200-500m 2 / g ultrafine powder, but it has been confirmed that in the process of repeated image formation, the silica ultrafine powder is buried on the surface of the toner particles, and...
Claims
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IPC IPC(8): C01B33/18G03G9/08
CPCC01P2004/32C01P2004/60G03G9/09725C09C1/30C01P2004/51C01P2004/62C01P2004/61C01P2006/80C01B33/181Y10T428/2982G03G9/0819
Inventor 佐佐木修治秀岛正章园田英明水本贵久
Owner DENKA CO LTD