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Milled and polar solvent extracted liquid developer
| Details |
Inventors: Tamai, Yasuo; Miyatuka, Hajime;
Assignee: Rank Xerox Ltd. (London, EN)
Primary Examiner: Martin, Jr.; Roland E.
Assistant Examiner:
Attorney, Agent or Firm:
A liquid developer composition is given whereby a mixture of pigment and resin is milled and washed prior to being dispersed in the carrier liquid. |
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DETAILED DESCRIPTION What is claimed is: 1.
A liquid developer composition which is free from impurities comprising pigment, resin, and an electrically insulating carrier liquid wherein the pigment and resin are treated with a polar solvent having a specific dielectric constant of at least about 12 to remove impurities therefrom after milling the same for from about 2 to about 150 hours.
2.
A process for preparing liquid developer capable of developing electrostatic latent images comprising milling a mixture of pigment and resin for from about 2 to about 150 hours, treating the milled mixture with a polar solvent having a specific dielectric constant of at least about 12 to remove impurities present therein, and dispersing the insoluble components of the milled mixture into an electrically insulating carrier liquid to form the liquid developer.
3.
The process according to claim 1 wherein the solvent is an alcohol.
4.
The process according to claim 1 wherein the solvent is a ketone.
5.
The process according to claim 1 wherein the solvent is selected from the group consisting of methanol, ethanol, butanol, propanol, acetone, methyl ethyl ketone, diethyl ketone, and mixtures thereof.
Description:
This invention relates to imaging systems, and more particularly, to improved developer materials.
The formation and development of images on the surface of photoconductive materials by electrostatic means is well known.
The basic electrostatographic process, as taught by Carlson in U.
S.
Pat.
No.
2,297,691, involves placing a uniform electrostatic charge on a photoconductive insulating layer, exposing the layer to a light and shadow image to dissipate the charge on the areas of the layer exposed to the light, and developing the remaining electrostatic latent image by depositing on the image a finely divided electroscopic marking material sometimes called "toner".
Toner will normally be attracted to those areas of the layer which retain a charge, thereby forming a toner image corresponding to the electrostatic latent image
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