Toner coagulant processes

a technology of coagulant and toner, applied in the field of xerographic systems, can solve the problems of substantial paper curling, adversely affecting the charging behavior of toners, and the charge level may be too low for proper toner developmen

Inactive Publication Date: 2002-12-12
XEROX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In process color where toner coverage is high, the relatively thick toner plastic covering on the paper can inhibit the paper from reabsorbing the moisture, and cause substantial paper curling.
However, higher pigment loadings, for example, of about 10 to about 20 percent by weight of toner may adversely affect the charging behavior of toners.
For example, the charge levels may be too low for proper toner development or the charge distributions may be too wide and toners of wrong charge polarity may be present.
Furthermore, higher pigment loading may also result in the sensitivity of charging behavior to charges in environmental conditions such as temperature and humidity.
Similarly, the aforementioned disadvantages, for example poo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation examples

TONER PREPARATION EXAMPLES

Example I

[0087] Preparation of Cyan Toner With Aluminum Sulfate Treatment:

[0088] 236.5 Grams of the above prepared latex emulsion (latex A) and 150 grams of an aqueous cyan pigment dispersion containing 49.8 grams of blue pigment PB 15.3 having a solids loading of 35.5 percent were simultaneously added to 540 milliliters of water at room temperature, about 25.degree. C., while being mixed at a shear speed of 5,000 rpm by means of a polytron. To this mixture were added 26 grams of a polyaluminum chloride (PAC) solution containing 2.6 grams of 10 percent solids and 23.4 grams of 0.2 molar nitric acid, over a period of 2 minutes, and blended at speed of 5,000 rpm for a period of 2 minutes. The resulting mixture, which had a pH of 2.7, was then transferred to a 2 liter reaction vessel and heated at a temperature of 58.degree. C. for 60 minutes resulting in aggregates of a size of 5.5 microns and a GSD of 1.21. To the resulting toner aggregates were added 108.2 ...

example ii

[0089] Preparation of Yellow Toner:

[0090] 236.5 Grams of the above prepared latex emulsion (latex A) and 150 grams of an aqueous cyan pigment dispersion containing 119.2 grams of yellow pigment PY 74 having a solids loading of 14.8 percent were simultaneously added to 480 milliliters of water at room temperature while being mixed at a shear speed of 5,000 rpm by means of a polytron. To this mixture were added 26 grams of a polyaluminum chloride (PAC) solution containing 2.6 grams of 10 percent solids and 23.4 grams of 0.2 molar nitric acid, over a period of 2 minutes, and blended at speed of 5,000 rpm for a period of 2 minutes. The resulting mixture, which had a pH of 2.5, was then transferred to a 2 liter reaction vessel and heated at a temperature of 58.degree. C. for 60 minutes resulting in aggregates of a size of 5.3 microns and a GSD of 1.20. To the resulting toner aggregates were added 108.2 grams of the above prepared latex (latex A) followed by stirring for an additional 30 ...

example iii

[0091] Preparation of Cyan Toner:

[0092] 236.5 Grams of the above prepared latex emulsion (latex A) and 150 grams of an aqueous cyan pigment dispersion containing 49.8 grams of blue pigment PB 15.3 having a solids loading of 35.5 percent were simultaneously added to 520 milliliters of water at room temperature while being mixed at a shear speed of 5,000 rpm by means of a polytron. To this mixture were added 26 grams of polyaluminum chloride (PAC) solution containing 2.6 grams of 10 percent solids and 23.4 grams of 0.2 molar nitric acid, over a period of 2 minutes, followed by blending at a speed of 5,000 rpm for a period of 2 minutes. The resulting mixture with a pH of 2.7 was then transferred to a 2 liter reaction vessel and heated at a temperature of 58.degree. C. for 60 minutes resulting in aggregates of a size of 5.4 microns and a GSD of 1.20. To the resulting toner aggregates were added 108.2 grams of the above prepared latex (latex A) followed by stirring for an additional 30 m...

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Abstract

A toner process including, for example, mixing a latex with a colorant wherein the latex contains resin and an ionic surfactant, and the colorant contains a surfactant and a colorant; adding a polyaluminum chloride; affecting aggregation by heating; adding a chelating component and a base wherein the base increases the pH of the formed aggregates; heating the resulting mixture to accomplish coalescence; and isolating the toner.

Description

[0001] In copending application U.S. Ser. No. 922,437, filed Sep. 2, 1997, the disclosure of which is totally incorporated herein by reference, there is illustrated, for example, a process for the preparation of toner comprising[0002] (i) aggregating with a metal complex or metal ion a colorant dispersion with a latex emulsion and optional additives to form aggregates;[0003] (ii) coalescing or fusing the aggregates; and optionally[0004] (iii) isolating, washing, and drying the toner.[0005] In U.S. Pat. No. 6,132,924, the disclosure of which is totally incorporated herein by reference, there is illustrated a process for the preparation of toner comprising mixing a colorant, a latex, and two coagulants, followed by aggregation and coalescence and wherein one of the coagulants may be polyaluminum chloride.[0006] In U.S. Ser. No. 09 / 551,465, the disclosure of which is totally incorporated herein by reference, there is illustrated a process for the preparation of toner comprising mixing ...

Claims

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Application Information

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IPC IPC(8): G03G9/08G03G9/097
CPCG03G9/09708G03G9/0804
Inventor JIANG, LUHU, NAN-XINGPATEL, RAJ D.MYCHAJLOWSKIJ, WALTERHOPPER, MICHAEL A.
Owner XEROX CORP
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