Photoreceptor outer layer and methods of making the same
View Patent ↗The presently disclosed embodiments relate generally to layers that are useful in imaging apparatus members and components, for use in electrophotographic, including digital, apparatuses. Embodiments pertain to an improved electrophotographic imaging member comprising a very thin outer layer on the imaging member surface, where the outer layer comprises healing materials that act as a barrier against moisture and/or surface contaminants. The improved imaging member exhibits improved xerographic performance, such as reduced wear and deletions in high humidity conditions. Embodiments also pertain to methods for making the improved electrophotographic imaging member.
1. A delivery system for delivering a healing material comprising:
a holder for holding an amount of a healing material; and
a delivery member for delivering the healing material from the holder onto a photoconductive member; wherein the delivery member comprises:
a substrate; and
an elastic outer layer having a thickness of from about 0.5 nanometer to about 10 microns disposed on the substrate, wherein a surface of the elastic outer layer has a pattern comprising an array of periodically ordered indentations or protrusions on the surface of the elastic outer layer, wherein the amount of the healing material is controlled by the pattern on the elastic outer layer, and further wherein the elastic outer layer of the delivery member is in continuous contact with the photoconductive member during a printing process.
2. The delivery system of claim 1 , wherein the elastic outer layer of the delivery member comprises an elastic material selected from the group consisting of polysiloxane, polyurethane, polyester, fluoro-silicone, and mixtures thereof.
3. The delivery system of claim 1 , wherein the indentations or protrusions have a regular shape selected from the group consisting of circles, rods, ovals, squares, triangles, polygons, and mixtures thereof.
4. The delivery system of claim 1 , wherein each of the indentations or protrusions has a perimeter of from about 5 nanometers to about 200 microns.
5. The delivery system of claim 1 , wherein each of the indentations has a depth of from about 0.5 nanometers to about 10 microns, and wherein each of the protrusions has a height of from about 0.5 nanometers to about 10 microns.
6. The delivery system of claim 1 , wherein the array of indentations or protrusions are regularly positioned over the surface of the elastic outer layer.
7. The delivery system of claim 1 , wherein the indentations or protrusions have a two-dimensional periodicity from hexagonal arrays, tetragonal arrays, quasi-crystal arrays, and linear arrays, and mixtures thereof.
8. The delivery system of claim 1 , wherein the array of indentations or protrusions have a center-to-center distance of from about 5 nanometers to about 500 microns.
9. The delivery system of claim 1 , wherein the substrate of the delivery member comprises a material selected from the group consisting of a metal, a polymer, a glass, a ceramic, and wood.
10. The delivery system of claim 1 , wherein the substrate of the delivery member is in a cylinder, a drum, or a belt configuration.
11. The delivery member of claim 1 , wherein the healing material comprises a lubricant material.
12. The delivery member of claim 11 , wherein the lubricant material is selected from the group consisting of paraffin, alkyl alkoxy-silanes, organic monomers with catalytic particles or microcapsules, organic polymers with catalytic particles, microcapsules, and mixtures thereof.