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Purified polyester resins for toner performance improvement

A technology of polyester resin and colorant, applied in the field of developer, can solve the problems of colorant reduction, poor fluidity of colorant, pollution, etc.

Inactive Publication Date: 2010-12-29
XEROX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventors also believe that problems such as poor colorant flow and clogging may be related to the tendency of contaminants to plasticize the colorant particles and thereby lower the Tg (glass transition temperature) of the colorant
In addition, the presence of low molecular weight acid monomers and oligomers is believed to lead to easier moisture uptake, which affects the variable charging performance as a function of ambient humidity levels

Method used

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  • Purified polyester resins for toner performance improvement
  • Purified polyester resins for toner performance improvement
  • Purified polyester resins for toner performance improvement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] Inject 300 g of methyl ethyl ketone (MEK) into a 500 ml beaker. While stirring the MEK solution at 256 rpm, slowly add 200 g of resin A (polycondensation product of terephthalic acid and a 1:1 mixture of ethoxylated bisphenol A and propoxylated bisphenol A), and then Stirring was continued until a clear solution was obtained. This solution was then slowly added to 750 g of methanol in a 2 L beaker under mechanical stirring at 350 rpm. After the above second addition, the resulting mixture was stirred for an additional 2 hours, then the resulting precipitate of the purified resin was collected by filtration to remove excess solvent and further dried at 40°C under vacuum.

Embodiment 2-4

[0117]Resin Examples 2-4 were prepared in exactly the same manner as in Resin Example 1, except that Resin B, Resin C, and Resin D were used in Resin Examples 2-4 instead of Resin A of Resin Example 1, respectively. Resin B consisted of the polycondensation product of propoxylated bisphenol A and fumaric acid (see formula II above). Resin C is a cross-linked version of Resin B as described in US Patent No. 5,227,460, which is incorporated herein by reference in its entirety. Resin D consisted of the polycondensation product of terephthalic acid and a 1:1 mixture of ethoxylated bisphenol A and propoxylated bisphenol A in combination with a small amount of trimellitic acid as a branching agent.

Embodiment 2

[0133] A mixture of 71 parts of purified resin B prepared according to resin example 2, 24 parts of purified resin C prepared according to resin example 3, and 5 parts of carbon black was premixed by drum tumbling for 20 minutes. This mixture was then melt-kneaded using a twin-screw extruder. The extrudate was then micronized to a median volume target of 7.6 microns by adding 0.3% by weight of small particle silica grinding aid, and then classified to remove fines to a median volume target of 8.3 microns. Surface additive blending of virgin color with small particles, hydrophobically treated fumed silica and titanium dioxide, and zinc stearate as described in Example 9 of U.S. Patent No. 6,365,316, which is incorporated by reference The full text is incorporated into this article. As a final step, the colorant is sieved to remove large particles.

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PUM

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Abstract

The invention discloses a purified polyester resin for toner performance improvement. A toner that includes at least one polyester resin wherein the amount of free polyvalent acid monomer in the polyester resin is less than 4 mg / gram, and wherein the percentage of the at least one polyester resin with a Mw less than 1500 is less than about 10%.

Description

technical field [0001] The disclosure of the present application relates to a colorant and a developer containing the same for forming and displaying images, and in particular, to a colorant formed with a purified polyester resin. The disclosure of the present application also relates to methods of producing and using such colorants and developers. Background technique [0002] In the electrophotographic printing method, a photoreceptor comprising a photoconductive insulating layer on a conductive layer is imaged by uniformly electrostatically charging the surface of the conductive layer. An electrostatic latent image is formed on non-irradiated areas by exposing the photoreceptors to an activating electromagnetic radiation, such as light, which selectively dissipates charge in illuminated areas of the photoconductive insulating layer. The toner particles are attracted from the carrier particles to the latent image to form a latent toner image. The toner image is then tran...

Claims

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Application Information

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IPC IPC(8): G03G9/087G03G9/08
CPCG03G9/08755G03G9/0815G03G9/08795
Inventor J·帕拉克T·L·林肯小W·H·霍伦鲍夫童玉华B·H·威廉森
Owner XEROX CORP
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