Electrophotographic toner

An electrophotographic and toner technology, applied in electrographics, optics, instruments, etc., can solve the problems of image quality stability, suppress the change of image quality concentration without touching, and be appropriate without any disclosure or description, and achieve stable charging. Excellent performance, widened fixing temperature range, and the effect of preventing low temperature excursions

Inactive Publication Date: 2006-08-16
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0029] In addition, in JP-A-2004-4207, there is no disclosure or description of the appropriateness of external additives for relative charge control, and it does not touch at all on the stability of image quality and the suppression of changes in image quality density due to environmental changes, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] ・Polyester resin (acid value: 21mgKOH / g)

[0103] Aromatic alcohol components: PO-BPA and EP-BPA

[0104] Acid component: 87.5% by weight of fumaric acid and mellitic anhydride

[0105] · C.I. Pigment Blue 15:1 5% by weight

[0106] ·Non-polar paraffin (DSP peak 78°C, Mw8.32×10 2 6% by weight

[0107] ・Electrification control agent (volume average particle diameter produced in the above production example is 2 μm)

[0108] 1.5% by weight

[0109] Mw of the above-mentioned nonpolar paraffin is known to represent a weight average molecular weight.

[0110] The above constituent materials were premixed with a Henschel mixer, and then melted and stirred in a biaxial extrusion mixer. The kneaded mixture was coarsely pulverized by a cutter, finely pulverized by a jet mill, and then classified by an air classifier to obtain a toner having an average particle diameter of 6.5 μm. Then, 1.0 parts by weight of silica...

Embodiment 2

[0112] Except that the acid value of the polyester resin was changed to 5 mgKOH / g as shown in Table 1, a toner was produced in the same manner as in Example 1.

Embodiment 3

[0114] Except that the acid value of the polyester resin was changed to 28 mgKOH / g as shown in Table 1, the procedure was the same as in Example 1 to prepare a toner.

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PUM

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Abstract

Provided is a toner not undergoing the effect of change of temperature and humidity, with high charging stability and having good fixing property and releasability. This is an electrophotographic toner containing at least a binder resin, a colorant, a charge controller and a wax in which the binder resin comprises a polyester resin having an aromatic alcohol ingredient, the charge controller comprises an organic bentonite and the wax comprises a non-polar paraffin wax.

Description

technical field [0001] The present invention relates to a toner for electrophotography. More specifically, it relates to a toner for electrophotography used as a developer in so-called electrophotographic image forming apparatuses such as electrostatic copiers and laser beam printers. Background technique [0002] Image formation in an electrophotographic image forming apparatus is performed in steps of charging, exposure, development, transfer, and fixing. First, in the charging step, the surface of a photoreceptor serving as an image carrier for forming an electrostatic latent image is uniformly charged. In the exposure step, an electrostatic latent image is formed on the surface of the charged photoreceptor by irradiating light corresponding to image information to the surface of the charged photoreceptor. In the developing step, for example, black toner is selectively attached to the formed electrostatic latent image, and a visible image (toner image) formed of the ton...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/097G03G9/087G03G9/08
Inventor 户泉朋子赤泽良彰小川哲铃木正郎松本启男恩田裕户泉洁石田稔尚泽井正幸木田耕史西川砌久保雅彦
Owner SHARP KK
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