Organic photoconductor drum having an overcoat containing nano metal oxide particles and method to make the same

Patent metadata

Field	Value
Publication number	US-10691032-B2
Application number	US-201715802712-A
Country	US
Kind code	B2
Filing date	Nov 3, 2017
Priority date	Nov 3, 2017
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

An improved organic photoconductor drum having a protective overcoat layer and method to make the same is provided. The protective overcoat layer is prepared from a curable composition including nano metal oxide particles sized less than 400 nm in combination with an urethane acrylate resin having at least 6 functional groups.

First claim

What is claimed is:

1. An organic photoconductor drum comprising:
a support element;
a charge generation layer disposed over the support element;
a charge transport layer disposed over the charge generation layer; and
an overcoat layer formed as an outermost layer of the organic photoconductor drum, the protective overcoat layer being formed from a curable composition including:
about 70 percent to about 95 percent by weight of a urethane acrylate resin having at least six radical polymerizable functional groups; and
about 5 percent to about 30 percent by weight of a nano metal oxide particle sized less than 400 nm and selected from the group consisting of indium tin oxide, aluminum oxide, zirconium oxide, zinc oxide, indium oxide, lanthanum oxide and antimony tin oxide,
wherein the overcoat layer does not include charge transport materials.

2. The organic photoconductor drum of claim 1 , wherein the urethane acrylate resin having at least six radical polymerizable functional groups is a hexa-functional aromatic urethane acrylate resin having the following structure:

3. The organic photoconductor of claim 1 , wherein the urethane resin having at least six radical polymerizable functional groups is a hexa-functional aliphatic urethane acrylate resin having the following structure:

4. The organic photoconductor drum of claim 1 , wherein the overcoat layer is cured by an electron beam.

5. The organic photoconductor of claim 4 , wherein the cured overcoat layer has a thickness of about 0.1 μm to about 10 μm.

6. The organic photoconductor drum of claim 1 , wherein the nano metal oxide particle is indium tin oxide.

7. The organic photoconductor drum of claim 6 , wherein the indium tin oxide metal particle is sized less than 200 nm.

8. The organic photoconductor drum of claim 1 , wherein the curable composition further includes a monomer or oligomer having at most five radical polymerizable functional groups.

9. The organic photoconductor drum of claim 1 , wherein the curable composition further includes a coating aid additive at an amount equal to or less than about 10 percent by weight of the curable composition.

10. The organic photoconductor drum of claim 9 , wherein the amount of the coating aid additive is about 0.1 to about 5 percent by weight of the curable composition.

11. The organic photoconductor drum of claim 9 , wherein the coating aid additive is a surfactant.

Assignees

• Lexmark Int Inc

Inventors

• Luo Weimei
• Bellino Mark Thomas

Classifications

• G03G5/14704 Primary

  comprising inorganic material · CPC title

• G03G5/1473

  Polyvinylalcohol, polyallylalcohol; Derivatives thereof, e.g. polyvinylesters, polyvinylethers, polyvinylamines · CPC title

• G03G5/14791

  Macromolecular compounds characterised by their structure, e.g. block polymers, reticulated polymers, or by their chemical properties, e.g. by molecular weight or acidity · CPC title

• G03G5/0525 Primary

  Coating methods · CPC title

• G03G5/0592

  Macromolecular compounds characterised by their structure or by their chemical properties, e.g. block polymers, reticulated polymers, molecular weight, acidity · CPC title