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Toner, developer, toner storage container, processing box, and image forming device

A toner and toner material technology, applied in the field of toner, can solve the problems of uneven frictional electrification of toner, polluted paper, excessive wax, etc., achieve excellent fluidity and replenishment, and have both durability Thermal preservation and low-temperature fixing properties

Active Publication Date: 2013-07-10
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, if the dispersed particle diameter of the domain particles is too large, the proportion of the wax existing near the surface of the toner particles will increase relatively, which may show cohesiveness and deteriorate the fluidity, or the wax may become weaker during long-term use. Move to the carrier or photoreceptor to cause filming, so that good image quality cannot be obtained
On the other hand, if the dispersed particle size of the domain particles is too small, the wax may be excessively finely dispersed and sufficient mold release properties may not be obtained.
[0005] In the above-mentioned kneading and pulverization method, since it is difficult to control the dispersed particle size of the domain particles of the wax, and the wax tends to exist on the fractured surface, various problems such as the following may arise: the amount of wax exposed on the surface of the toner increases. , poor fluidity or film formation, etc.
In addition, there are also problems that the toner obtained by the kneading and pulverization method generally has a wide particle size distribution, which causes unevenness in the triboelectric chargeability of the toner, and not only easily causes blurring (kaburi) and the like, but also causes problems in production. In terms of efficiency, it is difficult to obtain a small particle size toner with a volume average particle size of 2 μm to 8 μm, which cannot meet the requirements of high image quality.
but currently there is no way to
[0013] In addition, the toner described in Patent Document 6 uses a wax with a low melt viscosity to ensure paper releasability, but there is a problem that when a wax with a low melt viscosity is generally used, the wax volatilizes during fixing to generate volatile organic compounds, or polluted paper

Method used

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  • Toner, developer, toner storage container, processing box, and image forming device
  • Toner, developer, toner storage container, processing box, and image forming device
  • Toner, developer, toner storage container, processing box, and image forming device

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0205] The toner material liquid containing the toner material can be prepared by making a compound having an active hydrogen group, a polymer capable of reacting with a compound containing an active hydrogen group, a colorant, a wax, etc. in a solvent (oil medium). , wax dispersant, charge control agent, unmodified polyester resin and other toner materials are dissolved or dispersed. Alternatively, the oil phase may be obtained by preparing a dispersion obtained by dividing a part of these materials and dispersing them separately, and finally combining them together.

[0206] The emulsification or dispersion of the toner material liquid in the aqueous medium can be performed by emulsifying or dispersing the toner material liquid containing the toner material in the aqueous medium. Furthermore, when emulsifying or dispersing the toner material, the compound having an active hydrogen group and the polymer capable of reacting with the compound containing an active hydrogen group...

Embodiment 1

[0464] ——Preparation of Wax Dispersion 1——

[0465] Add [unmodified polyester 1] 378 mass parts, wax A (microcrystalline wax BeSquare 180 white, manufactured by TOYO ADL company, 67 ℃ of fusing points in the reaction vessel that stirring rod and thermometer are installed; 1.2%) 110 parts by mass, 66 parts by mass of the wax dispersant, and 947 parts by mass of ethyl acetate were heated to 80° C. with stirring, kept at 80° C. for 5 hours, and then cooled to 30° C. over 1 hour. Then, the wax was finely dispersed using a bead mill so that the median particle size finally measured with a laser diffraction / scattering particle size distribution analyzer manufactured by Horiba was 0.5 μm, and this was used as [wax dispersion 1].

[0466] ——Preparation of oil phase——

[0467] 500 parts by mass of the above masterbatch and 1,012 parts by mass of ethyl acetate were added to 2,493 parts by mass of [wax dispersion 1], and mixed for 1 hour to obtain a raw material solution.

[0468] 1,32...

Embodiment 2

[0486] In the removal of the organic solvent in Example 1, except that the aging conditions were changed from 12 hours at 55°C to 2 hours at 55°C, the same procedure as in Example 1 was carried out to produce the product of Example 2. toner.

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Abstract

The invention provides a toner, a developer, a toner storage container, a processing box, and an image forming device. The toner keeps small grain size with narrow distribution and excellent mobility. When the toner is fixation, the dirt on the back of the print paper is reduced. Moreover, little film formation is happened, and the selectivity of the paper amide fixation is excellent, with excellent mobility, replenishment, and transfer print efficiency and with low temperature fixation and heat-resisting property, thereby obtaining the image having high definition. The toner is obtained by emulsifying or dispersing toner material in a water-system medium and then carrying out pelleting. The toner contains a hydrocarbon-system wax and bonding resin. The mass of the hydrocarbon-system wax is reduced below 10% at the temperature of 165 DEG C. Moreover, the viscosity Eta of the toner measured by a rheometer and the wax seepage W amid fixation satisfy the following formula (1): 40>= Eta*(W-0.18)>=13.

Description

technical field [0001] The present invention relates to a toner suitable for use in electrophotography, electrostatic recording, a developer having the toner, a toner storage container and a process cartridge, and an image forming apparatus using the toner method, electrostatic printing method, etc. Background technique [0002] Image formation by electrophotography is generally carried out through a series of processes, that is, forming an electrostatic charge image on a photoreceptor (electrostatic charge image carrier), developing the electrostatic charge image with a developer, and forming a visible image (toner image), and then transfer the visible image to a recording medium such as paper, and fix it on the transfer medium by heat, pressure, or solvent gas, thereby forming a fixed image (see Patent Document 1) . [0003] As the above-mentioned developers, there are known one-component developers using a magnetic toner or a non-magnetic toner alone, and two-component ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/087G03G9/08G03G15/08G03G21/18G03G15/00
Inventor 斯波正名长友庸泰本多隆浩霜田直人千叶龙太
Owner RICOH KK