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Electronic photographic toner additive, toner, develpoer, imaging method and device

A technology for electrophotography and toner, which is applied in the fields of developer, electrography, chemical instruments and methods, etc., and can solve the problem of not finding an effective solution.

Inactive Publication Date: 2004-05-12
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, no effective solution to these needs has been found

Method used

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  • Electronic photographic toner additive, toner, develpoer, imaging method and device
  • Electronic photographic toner additive, toner, develpoer, imaging method and device
  • Electronic photographic toner additive, toner, develpoer, imaging method and device

Examples

Experimental program
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Effect test

preparation example Construction

[0259] The preparation method of the tape is not particularly limited, and includes, for example: a centrifugal forming method, in which a material is placed in a rotating cylindrical mold to form a tape; a spraying method, in which a liquid coating composition is sprayed to form a film; a dipping method, in which a cylindrical The model is immersed in the solution of the material and then taken out; the injection method, that is, injecting the material composition into the inner model or the outer model; and the method of placing the compound around the cylindrical model, and then undergoing vulcanization and polishing. Typically two or more of these methods are used in combination to form the tape. Other methods can also be used.

[0260] In order to prevent elongation of the elastic webbing, a less elongated rubber layer may be formed around the inner core resin layer, or an elongation preventing material may be incorporated into the inner core layer. Its preparation metho...

Embodiment 1

[0406] --Oxide particle 1--

[0407] The methyltrimethoxysilane refined by distillation is heated, followed by bubbling nitrogen gas into the heated methyltrimethoxysilane. Then methyltrimethoxysilane is introduced into the oxyhydrogen flame burner along with the flow of nitrogen gas, and burns and decomposes in the oxyhydrogen flame. The contents of methyltrimethoxysilane, oxygen, hydrogen and nitrogen are 1270 g / h, 2.9Nm 3 / hour, 2.1Nm 3 / hour and 0.58Nm 3 / Hour. The spherical silica fines formed were collected using a bag filter. A total of 1 kg of spherical silica fine powder was put into a 5-liter planetary mixer, and then 10 g of pure water was added to the spherical silica fine powder while stirring. After sealing the mixer, the mixture was stirred at 55°C for 14 hours. After cooling to room temperature, the stirred mixture was treated with 20 g of hexamethyldisilazane with stirring. After sealing the mixer, the mixture was further stirred for 24 hours. The reac...

Embodiment 2 to 7

[0444] Toners and developers were prepared in the same manner as in Example 1 except that oxide particles 2 to 7 were used instead of oxide particles 1, respectively, and their properties were measured, as shown in Table 2.

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PUM

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Abstract

An external additive for a toner for electrophotography which contains oxide fine particles which contain silicon, in which the oxide fine particles have a primary particle diameter of 30 nm to 300 nm in number average, a standard deviation sigma of a particle size distribution of the primary particle diameter satisfies a relation of: R / 4<=sigma<=R in which the R expresses the primary particle diameter, the oxide fine particles are substantially spherical having a circularity SF1 defined as equation (1) of 100 to 130 and a circularity SF2 defined as equation (2) of 100 to 125; SF1=(L<2> / A)x(pi / 4)x100 equation (1) SF2=(P<2> / A)x( 1 / 4 pi)x100 equation (2), in the equations, 'L' expresses the absolute maximum length of the oxide fine particles; 'A' expresses a projected area of the oxide fine particles; and 'P' expresses a maximum perimeter of the oxide fine particles.

Description

technical field [0001] The present invention relates to an additive used in electrophotographic toner, a toner for electrophotography, a developer for electrophotography, an image forming method, and an image forming apparatus. Background technique [0002] A general image forming method used in electrophotography or xerographic printing includes a developing step, a transferring step, and a fixing step. The developing step includes uniformly charging the photoconductive insulating layer, irradiating the insulating layer with radiation to discharge the exposed portion, thereby forming an electrostatic latent image (latent electrostatic image), and providing the electrostatic latent image with toner formed of charged particles, This makes the image appear. The transferring step includes transferring the developed image onto an image transfer member such as transfer paper. The fusing step involves fusing the image with heat and / or pressure, typically using a heated roller. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/00C09C1/04C09C1/30C09C3/12G03G9/097
CPCC01G9/00C09C1/3081G03G9/09716G03G9/09725C01P2004/64C09C1/043B82Y30/00C09C3/12C01P2004/62C09C1/3045
Inventor 杉浦英树望月贤梅村和彦中山慎也朝比奈安雄
Owner RICOH KK
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