Claims
- 1. An improved two-component contamination free developer composition of: a toner having magnetite and a polyester resin comprised of the polymeric esterification product of a dicarboxylic acid or anhydride selected from the group consisting of fumaric and maleic, and a diol comprising a diphenol of the following formula ##STR3## wherein R, R' and R" are the same or different and each is selected from substituted or unsubstituted lower alkyl radicals; and carrier particles; said magnetite being about 15 to about 50 percent, and said polyester resin being about 50 to about 85 percent, by weight of the toner.
- 2. An improved developer composition in accordance with claim 1 wherein the magnetite is present in an amount of from about 20 percent by weight to about 50 percent by weight, and the polyester resin is present in an amount of from about 50 percent by weight to about 80 percent by weight.
- 3. A developer composition in accordance with claim 1 wherein the polyester is obtained from the reaction of 2,2-bis(4-hydroxyisopropoxy phenyl)propane and fumaric acid.
- 4. A developer composition in accordance with claim 1 further including additive particles.
- 5. A developer composition in accordance with claim 4 wherein the additive particles are selected from the group consisting of colloidal silicas, metal salts, and metal salts of a fatty acid.
- 6. A developer composition in accordance with claim 5 wherein the fatty acid metal salt is zinc stearate.
- 7. A developer composition in accordance with claim 5 wherein the colloidal silica additive particles are present in an amount of from about 0.2 percent by weight to about 0.8 percent by weight of the toner.
- 8. A developer composition in accordance with claim 5 wherein the metal salt fatty acid additive particles are present in an amount of from about 0.1 percent by weight to about 0.6 percent by weight of the toner.
- 9. A developer composition in accordance with claim 5 wherein the colloidal silica is present in an amount of 0.65 percent by weight, and the metal salt of fatty acid is present in an amount of 0.35 percent by weight of the toner.
- 10. A developer composition in accordance with claim 1 wherein the carrier particles contain a coating thereover.
- 11. A developer composition in accordance with claim 10 wherein the coating is selected from the group consisting of polymethylmethacrylates, and terpolymers of styrene, methacrylate, and a vinyl triethoxy silane.
- 12. A developer composition in accordance with claim 1 further including pigment particles in the toner.
- 13. A developer composition in accordance with claim 12 wherein the pigment particles are carbon black.
- 14. A developer composition in accordance with claim 12 wherein there is further included additive particles selected from the group consisting of colloidal silicas, metal salts, and metal salts of a fatty acid.
- 15. A developer composition in accordance with claim 14 wherein the fatty acid metal salt is zinc stearate.
- 16. A developer composition in accordance with claim 10 wherein the carrier core is steel.
BACKGROUND OF THE INVENTION
The present application is a continuation-in-part application of U.S. Ser. No. 566,754, filed on Dec. 27, 1983, entitled Improved Process for Preventing Deposition of Toner Particles in an Imaging Apparatus; which in turn was a continuation-in-part of U.S. Ser. No. 219,674, filed Dec. 24, 1980, entitled Contamination Free Toner and Process, which application has been abandoned. The disclosure of each of the aforementioned applications are totally incorporated herein by reference.
US Referenced Citations (5)
Foreign Referenced Citations (5)
Number |
Date |
Country |
33248 |
Aug 1981 |
EPX |
1373220 |
Nov 1974 |
GBX |
1570239 |
Jun 1980 |
GBX |
1578566 |
Nov 1980 |
GBX |
1602427 |
Nov 1981 |
GBX |
Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
566754 |
Dec 1983 |
|
Parent |
219674 |
Dec 1980 |
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