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Electrophotographic toner

A technology of electrophotography and toner, applied in the direction of developer, electrographic recording, instruments, etc., can solve the problems of not considering the oozing effect, not being able to realize, and not enough offset field.

Inactive Publication Date: 2004-11-03
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, proper exudation of the various waxes from the resin is not considered, and no offset domain is sufficient and cannot be achieved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0045] The organic toner of the present invention is described with reference to Examples and Comparative Examples.

[0046] (Preparation Example of Organic Toner)

[0047] After uniformly mixing the following components in a universal mixer, heat, melt and knead them using a twin-screw extruder, and cool them down:

[0048] - Polyester resins (terephthalic acid, fumaric acid or trimellitic anhydride used together with propylene oxide of bisphenol A): 100 parts by weight;

[0049] -copper phthalocyanine (pigment blue 15): 5 parts by weight;

[0050] - charge control agent (zinc salicylate compound): 2.0 parts by weight; and

[0051] - wax mixture.

[0052] After the kneaded product thus obtained is coarsely pulverized in a cutter pulverizer, it is finely pulverized with an ultrasonic jet pulverizer, and fine powder of 5 μm or less is removed by a classifier to obtain a classified organic toner. The particle size distribution ranged from 5-16 μm with an average particle siz...

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Abstract

In the toner comprising at least a colorant, a releasing agent and a binder resin, the releasing agent being a mixture of carnauba wax and non-paraffin wax, the binder resin contains a polyester resin having an acid value of 7 to 20 mg KOH / g. An electrophotographic negatively charged full color toner having good fixing property, glossiness, transparency, and releasability without coating a fixing oil to a fixing apparatus.

Description

[0001] This non-provisional application claims priority under 35 U.S.C. §119(a) to Patent Application No. 2003-080855 filed in Japan on March 24, 2003, which is incorporated by reference in its entirety. field of invention [0002] The present invention relates to an electrophotographic organic toner, and more particularly to an organic toner used in full-color electrophotography for image formation using so-called electrophotography equipment such as xerographic copiers or laser beam printers. Background of the invention [0003] In hard copy technology using electrophotography, in recent years, black organic toner used in black-and-white printing is required to have a low Fusing temperature and wide fusing area. [0004] In addition, hard copy technology has rapidly developed to full-color applications, especially the market for full-color products is growing. In color images produced using full-color electrophotography, all colors are generally reproduced by using organ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/087G03G9/09
CPCG03G9/08704G03G9/08782G03G9/08795G03G9/08797G03G9/08755
Inventor 久保雅彦
Owner SHARP KK