Liquid electrophotographic printing processes
A process which comprises the generation of an image on an imaging member, developing the image with a liquid developer, and transferring the image to a substrate, and which substrate is coated with an acrylic, a nylon, a vinyl polymer, a wax, or a paraffin component.
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Claims
1. A process which comprises the generation of an image on an imaging member, developing the image with a liquid developer, and transferring the image to a substrate, and which substrate is coated with an acrylic, a nylon, a vinyl polymer, a wax, or a paraffin component.
2. A process in accordance with claim 1 wherein image transfer is improved, and said transfer is from about 75 to about 99 percent.
3. A process in accordance with claim 1 wherein the coating is a wax, or a paraffin.
4. A process in accordance with claim 1 wherein the coating thickness is from about 1 micron to about 50 microns.
5. A process in accordance with claim 1 wherein the substrate is paper.
6. A process in accordance with claim 2 wherein image transfer is from about 80 to about 97 percent.
7. A process in accordance with claim 3 wherein image transfer is from about 90 to about 97 percent.
8. A process in accordance with claim 1 wherein the liquid developer is comprised of thermoplastic resin, colorant, charge control agent, nonpolar liquid, and a charge director.
9. A process in accordance with claim 1 wherein there is selected for development a positively charged liquid developer comprised of a nonpolar liquid, thermoplastic resin, a cyclodextrin charge control additive, colorant, and a charge director comprised of a nonpolar liquid soluble organic aluminum complex, or mixtures thereof of the formulas ##STR4## wherein R.sub.1 is selected from the group consisting of hydrogen and alkyl, and n represents the number of R substituents.
10. A process in accordance with claim 9 wherein the charge control additive is beta-cyclodextrin, and wherein R.sub.1 is methyl, ethyl, propyl, or butyl; and n is 0, 1, 2, 3, or 4; or wherein R.sub.1 is isopropyl, n-butyl, isobutyl, or tert-butyl; and n is 0, 1, 2, 3, or 4.
11. A process in accordance with claim 9 wherein the charge director aluminum complex is selected from the group consisting of hydroxy bis(3,5-di-tert-butyl salicylic) aluminate, hydroxy bis(3,5-di-tert-butyl salicylic) aluminate monohydrate, hydroxy bis(3,5-di-tert-butyl salicylic) aluminate dihydrate, hydroxy bis(3,5-di-tert-butyl salicylic) aluminate tri- or tetrahydrate, and mixtures thereof, wherein the thermoplastic resin is ethylene vinyl acetate, the charge control additive is beta-cyclodextrin, and the colorant is a pigment of carbon black.
12. A process in accordance with claim 9 wherein the colorant is a cyan pigment, a magenta pigment, a yellow pigment, a red pigment, a blue pigment, a green pigment, or mixtures thereof.
13. A process in accordance with claim 9 with a solids content of from about 1 to about 5 weight percent, and which solids are comprised of thermoplastic resin, pigment, and charge control additive, and wherein said pigment is present in an amount of from about 35 to about 50 weight percent based on the weight percent of toner solids; the resin is present in an amount of from about 50 to about 65 weight percent based on the weight percent of toner solids; and the cyclodextrin is present in an amount of from about 5 to about 10 weight percent based on the weight percent of toner solids.
14. A process in accordance with claim 9 wherein the liquid is an aliphatic hydrocarbon.
15. A process in accordance with claim 9 wherein said resin is ethylene vinyl acetate, the charge control additive is beta cyclodextrin, or N,N,N-trimethyl-N-2-hydroxypropyl ammonium chloride substituted beta cyclodextrin, and the charge director is hydroxy bis(3,5-di-tert-butyl salicylic) aluminate.
16. A process in accordance with claim 1 wherein the coating is applied to a substrate of paper within an imaging apparatus, between the time the paper is loaded into the apparatus, and the time the developed liquid toner image is transferred to the paper.
17. A process in accordance with claim 16 wherein the coating is applied from a reservoir of coating material by a coating roll, a coating bar, a coating knife, a saturated pad, or a foam.
18. A process in accordance with claim 16 wherein the coating is dried between the time it is applied and the time that transfer occurs.
19. A process in accordance with claim 18 wherein the drying is achieved by using warm air, or wherein the drying is achieved with microwave energy.
20. A process for improving the transfer of images from a photoconductive imaging member comprising developing the image with a liquid developer, and transferring the image to a substrate, and which substrate is coated with an acrylic, nylon, a vinyl polymer, a wax, or a paraffin, and wherein image transfer is from about 80 to about 98 percent.
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Type: Grant
Filed: Sep 22, 1997
Date of Patent: Sep 7, 1999
Assignee: Xerox Corporation (Stamford, CT)
Inventors: Edward B. Caruthers, Jr. (Rochester, NY), Constance J. Thornton (Ontario, NY), Paul W. Morehouse, Jr. (Webster, NY), Terry D. Seim (Webster, NY), Scott W. Wolff (Hilton, NY), Weizhong Zhao (Webster, NY), John Chinnici (Rochester, NY), Stewart W. Volkers (Ontario, NY), Shu Chang (Webster, NY)
Primary Examiner: Charles T. Jordan
Assistant Examiner: Meena Chelliah
Attorney: Eugene O. Palazzo
Application Number: 8/934,670
International Classification: G03G 1314;
