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| Toner for developing electrostatic charge image and process for preparing the same |
| An object of the present invention is to provide a toner having a small-particle-size which has ... |
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| Piezo-active photoreceptor and system application |
| The deficiencies discussed above are overcome by the present invention. The charge retentive member ... |
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| Toner for use in developing electrostatic images |
| What we claim is: 1. In a method of electrophotography comprising developing an electrostatic ... |
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| Toner aggregation processes |
| What is claimed is: 1. A process for the preparation of toner compositions comprising: (i) forming ... |
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| Toner |
| The present invention has been created in order to solve the problems as described above, and the ... |
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| Toner with wax component for developing electrostatic image |
| An object of the present invention is to provide a toner for developing an electrostatic image ... |
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| Coloring fine particle and toner for developing electrostatic images using the same |
| The objects of the present invention are achieved by coloring fine particles, produced by heating ... |
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Electrographic toner containing resin-compatible quaternary ammonium compound
| Details |
Inventors: Lu, Chin H.;
Assignee: Xerox Corporation (Stamford, CT)
Primary Examiner: Welsh; John D.
Assistant Examiner:
Attorney, Agent or Firm: Palazzo; E. O.
Toners comprised of a resin and a quaternary ammonium compound of the formula ##STR1## in which at least two R radicals are hydrocarbon radicals having from about 8 to about 22 carbon atoms and each other R is a hydrogen or hydrocarbon radical having from 1 to about 8 carbon atoms, and A is an anion for example, sulfate, sulfonate, nitrate, borate, chlorate, and the halogens such as iodide, chloride, and bromide. Methods of their formation and use in various electrophotographic imaging systems is disclosed. The quaternary ammonium compound is generally present as a coating on a pigment that is used in the toner, such pigment being for example carbon black. Toners containing the above described quaternary ammonium compounds generally result in a toner containing a positive charge thus allowing development of negative images that may be formed on photoreceptors, especially organic photoreceptors. A developer composition comprising the above ingredients together with a carrier such as steel were found suitable for use in developing electrostatic latent images. |
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DETAILED DESCRIPTION What is claimed is: 1.
A developer composition comprised of a carrier, toner resin, and a pigment which is coated with from about 0.
1 to about 10 percent of a quaternary ammonium compound thereby causing the toner to become positively charged said quaternary ammonium compound being of the formula: ##STR3## in which at least two R radicals are hydrocarbon radicals having from about 8 to about 22 carbon atoms and each other R is selected from hydrogen and hydrocarbon radicals having from 1 to about 8 carbon atoms, and A is an anion selected from sulphate, sulphonate, nitrate, borate, chlorate, chloride, iodide, and bromide.
2.
A developer in accordance with claim 1 wherein the resin used is a styrene copolymer of n-butylmethacrylate, the pigment used is carbon black and the quaternary ammonium compound is dimethyl distearyl ammonium chloride.
3.
A developer in accordance with claim 1 wherein the resin is a copolymer of styrene/isobutyl methacrylate and the quaternary ammonium compound is dimethyl di(hydrogenated-tallow) ammonium chloride.
4.
A developer in accordance with claim 1 wherein the carrier is steel.
5.
A method of imaging comprising forming an electrostatic latent image, contacting the image with a developer composition comprised of a carrier a toner resin, and a pigment which is coated with from about 0.
1 to about 10 percent of a quaternary ammonium compound thereby causing the toner to become positively charged, said quaternary ammonium compound being of the formula: ##STR4## in which at least two R radicals are hydrocarbon radicals having from about 8 to about 22 carbon atoms and each other R is selected from hydrogen and hydrocarbon radicals having from 1 to about 8 carbon atoms, and A is an anion selected from sulphate, sulphonate, nitrate, borate, chlorate, chloride, iodide, and bromide, subsequently transferring the developed image to a paper substrate, and permanently forming the image thereon.
6.
A method in accordance with claim 5 wherein the resin is a copolymer of styrene-n-butylmethacrylate, the pigment is carbon black and the quaternary ammonium compound is dimethyl distearyl ammonium chloride
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Molecular Biology 
