External additive, method of manufacturing same and toner

An electrostatic charge image and external additive technology, applied in the direction of developer, electric recording process using charge pattern, electric recording process using charge pattern, etc., can solve problems such as inability to obtain quality, carrier particle adhesion, surface treatment layer damage, etc. , to achieve the effects of improving durability, improving electrification, and preventing scattering

Inactive Publication Date: 2009-05-06
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0031] Therefore, the current situation is that when the toner is used, the surface treatment layer of the titanium dioxide particles is damaged, and there are problems such as adhesion to the carrier particles, and the long-term running quality of the machine is affected by changes in the external climate environment, and sufficient quality cannot be obtained.

Method used

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  • External additive, method of manufacturing same and toner
  • External additive, method of manufacturing same and toner
  • External additive, method of manufacturing same and toner

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example -A

[0137] 40 g of commercially available trifluoropropyltrimethoxysilane (Dow Chemical Corporation Z-6333 CAS No 429-60-7) was dissolved in 200 g of ethanol solvent.

[0138] Then, commercially available (MT150 from Teika Co., Ltd.) with a water-soluble content of 0.31% was dispersed in toluene so that the solid content concentration was 37%, and the bead diameter was 0.5 mm. A bead mill (bead mill NVM-2 type manufactured by AIMEX Co.) was pulverized for about 2 hours to obtain particles with an average particle diameter of 0.047 μm (measured with NIKKISOmicro trackUPA-150), and weighed 630 g.

[0139] Further, the silane solution and the toluene solvent in which titanium dioxide was dispersed were mixed, and transferred to a 1 L four-necked flask installed in an oil bath. Use a stirrer at 60rpm to stir while shooting and heat up to 60°C, and react for 6 to 7 hours at the same time, then raise the temperature to 80°C. At this time, the amount of ethanol and toluene was collecte...

Synthetic example -B

[0142] Commercially available trifluoropropyltrimethoxysilane (Z-6333 from Toray Corporation) and methyltrimethoxysilane (Z-6366 from Toray Corporation) were dissolved in 200 g of methanol at an equivalent ratio of 40 g.

[0143] Then, commercially available (Teika Corporation MT150) titanium dioxide with a water-soluble content of 0.31% was dispersed in toluene so that the solid content concentration was 37%, and the bead diameter was 0.5 mm. A bead mill (bead mill NVM-2 type manufactured by AIMEX Co.) was pulverized for about 2 hours to obtain particles with an average particle diameter of 0.047 μm (measured with NIKKISOmicro trackUPA-150), and weighed 630 g.

[0144] Further, the silane solution and the toluene solvent in which titanium dioxide was dispersed were mixed, and transferred to a 1 L four-necked flask installed in an oil bath. Use a stirrer at 60rpm to stir while injecting the function temperature to 60°C, and react for 6 hours to 7 hours at the same time, then ...

Synthetic example -D

[0147] A mixture of commercially available trifluoropropyltrimethoxysilane (Z-6333 from Toray Corporation) and methyltrimethoxysilane (Z-6366 from Toray Corporation) dissolved in 190g of methanol solvent and 10g of water at an equal ratio of 40g middle. After the solution was left in a laboratory at 25°C for a day and night, a cloudy solution that was not observed in Synthesis Examples-A~C could be observed, and the surface treatment operation was performed in the same manner as Synthesis Examples-A~C.

[0148] When the gasification reaches 90% of the solvent amount relative to the prescribed amount, the set temperature is raised to 130°C to 140°C, and the temperature rise in the tank is confirmed. When the rise becomes slow, the pressure can be reduced. When the temperature in the tank exceeds 110°C, the decompression is stopped, and the calcining is performed for about 6 hours. At this time, a sample was sampled, and it was confirmed that the Rt peak due to the silylation r...

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Abstract

The invention provides a titanium dioxide external additive which is capable of being controlled stably, maintaining frictional charging amount, having less ambient variation, maintaining stable frictional charging performance, and which is free from abnormal images resulted from attachment of a toner to a photoreceptor that is generated while image developing and subjected to a surface modification treatment. The invention also provides an electrostatic charge images developing toner that is externally added with the external additive and an image forming method using the electrostatic charge images developing toner. The inventive external additive has the characteristic that particle surface of titanium dioxide having a water-soluble component of more than 0.2% is modified by the fluorosilane compound.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic latent image used in a developer for developing an electrostatic charge image such as electrophotography, electrostatic recording, and electrostatic printing, and an external additive used in the toner for developing an electrostatic charge image. A method for forming a toner image for latent image development. More specifically, the present invention relates to titanium dioxide coated with a specific surface treatment agent on the surface of particles, external additives that are beneficial to stable chargeability and image formation, and the use of The toner for developing an electrostatic charge image using the external additive and an image forming method. Background technique [0002] Regarding the developer used in electrophotography, electrostatic recording, electrostatic printing, etc., in the developing process, once it is attached to a latent image carrier such as a phot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G13/08
CPCG03G9/09708G03G9/09716C01P2004/64C09C1/3684G03G9/08755B82Y30/00G03G9/00C09K3/00
Inventor 利元正则中田正和植田英之
Owner RICOH KK
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