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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, damage to the surface treatment layer, and adhesion of carrier particles , to achieve the effects of improving durability, preventing scattering, and improving electrification

Inactive Publication Date: 2012-01-04
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

[0138] 40 g of commercially available trifluoropropyltrimethoxysilane (Z-6333CAS No.429-60-7, manufactured by ダウケミカル company) was dissolved in 200 g of ethanol solvent.

[0139] Then, commercially available (Tika 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 diameter of the beads was 0.5mm. After pulverizing in a bead mill (bead mill NVM-2 type manufactured by AIMEX Co.) for about 2 hours to obtain particles with an average particle size of 0.047 μm (measured with NIKKISOmicro trackUPA-150), weigh 630 g.

[0140] Furthermore, the silane solution and the toluene solvent in which titanium dioxide was dispersed were mixed, and transferred to a 1 L four-necked flask set in an oil bath. Use a mixer to stir and shoot at 60 rpm to reach 60°C while reacting for 6 to 7 hours, and raise the temperature to 80°C. At this time, the amount of ethanol and toluene was collected from the ...

Synthetic example -B

[0143] Commercially available trifluoropropyltrimethoxysilane (Z-6333 from Toray) and methyltrimethoxysilane (Z-6366 from Toray) were dissolved in 200 g of methanol at an equivalent ratio of 40 g.

[0144] Then, commercially available (Tika 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 diameter of the beads was 0.5mm. After pulverizing in a bead mill (bead mill NVM-2 type manufactured by AIMEX Co.) for about 2 hours to obtain particles with an average particle size of 0.047 μm (measured with NIKKISOmicro trackUPA-150), weigh 630 g.

[0145] Furthermore, the silane solution and the toluene solvent in which titanium dioxide was dispersed were mixed, and transferred to a 1 L four-necked flask set in an oil bath. Use a mixer to stir and shoot at 60 rpm to reach 60°C while reacting for 6 to 7 hours, and raise the temperature to 80°C. At this time, the amount of ethanol and tol...

Synthetic example -D

[0148] Commercially available trifluoropropyltrimethoxysilane (Z-6333 from Toray) and methyltrimethoxysilane (Z-6366 from Toray) are dissolved in a mixture of 190g methanol solvent and 10g water in an equal ratio of 40g in. After the liquid was left in a laboratory at 25°C for a day and night, a cloudy liquid that could not be observed in Synthesis Examples-A to C was observed, and the surface treatment was performed in the same manner as in Synthesis Examples-A to C.

[0149] When the vaporization reaches 90% of the amount of solvent used in the prescription, the set temperature is raised to 130°C to 140°C to check the temperature rise in the tank. When the rise slows down, the pressure can be reduced. When the temperature in the tank exceeds 110°C, the pressure reduction is stopped, and the calcination is carried out for about 6 hours. At this time, the sample was sampled and it was confirmed that the Rt peak due to the silanization reaction disappeared. Regarding the judgmen...

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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 Patents(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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