# US 2023/0058033 A1 · Photoconductor overcoat consisting of nano metal oxide particles, urethane resin, crosslinkable siloxaines, acrylic copolymer and no transport materials

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- Number: US 2023/0058033 A1
- Document ID: US20230058033A1
- Status: Published application
- Kind: A1
- Application number: 17/871,560
- Filed: 2022-07-22
- Published: 2023-02-23
- Earliest claimed: 2021-08-11
- Assignees: Lexmark International, Inc.
- Applicants: Lexmark International, Inc.
- Inventors: MATTHEW RUSSELL SMITHER; WEIMEI LUO; LAURA LEE KIERSTEIN; MATTHEW DAVID HEID; MARK THOMAS BELLINO
- Web page: https://patentgrep.com/patent/US20230058033A1

## CPC

- G03G 5/14704: {comprising inorganic material}
- G03G 5/14734: {Polymers comprising at least one carboxyl radical, e.g. polyacrylic acid, polycrotonic acid, polymaleic acid; Derivatives thereof, e.g. their esters, salts, anhydrides, nitriles, amides}
- G03G 5/14773: {Polycondensates comprising silicon atoms in the main chain}
- G03G 5/14786: {Macromolecular compounds characterised by specific side-chain substituents or end groups}
- G03G 5/14791: {Macromolecular compounds characterised by their structure, e.g. block polymers, reticulated polymers, or by their chemical properties, e.g. by molecular weight or acidity}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An improved overcoat layer for an organic photoconductor drum of an electrophotographic image forming device is provided. The overcoat layer is prepared from a curable composition including a crosslinkable siloxane, an acrylic polymer with pigment affinic groups, nano metal oxide particles sized less than 400 nm in combination with a urethane acrylate resin having at least 6 functional groups. The outermost layer of an organic photoconductors is coated with the overcoat formulation of the present invention then cured. The resulting cured overcoated organic photoconductor has improved wear resistance and importantly does not negatively altering the electrophotographic properties of the organic photoconductor.

## Claims

### Claim 1

An overcoat layer for an organic photoconductor drum, comprising a curable composition including:
about 20 percent to about 95 percent by weight of a urethane acrylate resin having at least six radical polymerizable functional groups;
about 5 percent to about 30 percent by weight of an indium tin oxide particle sized less than 200 nm;
about 0.05 percent to about 3 percent by weight of a crosslinkable polyether modified acryl functional polymethylsiloxane;
about 0.05 percent to about 6 percent by weight of a structured acrylic polymer with pigment affinic groups; and
an organic solvent, wherein the overcoat does not include any charge transport materials.

### Claim 2 (depends on 1)

The overcoat layer of claim 1, wherein the amount of the crosslinkable polyether modified acryl functional polymethylsiloxane is about 0.1 to about 2 percent by weight of the curable composition.

### Claim 3 (depends on 1)

The overcoat layer of claim 1, wherein the amount of the structured acrylic polymer with pigment affinic group is about 0.1 percent to about 5 percent by weight of the curable composition.

### Claim 4 (depends on 1)

The overcoat layer of claim 1, wherein the urethane acrylate resin having at least six radical polymerizable functional groups is a hexa-functional aromatic urethane acrylate resin.

### Claim 5 (depends on 1)

The overcoat layer of claim 1, wherein the urethane acrylate resin having at least six radical polymerizable functional groups is a hexa-functional aliphatic urethane acrylate resin.

### Claim 6 (depends on 1)

The overcoat layer of claim 1, wherein the curable composition further includes a coating aid additive.

### Claim 7 (depends on 6)

The overcoat layer of claim 6, wherein the amount of the coating aid additive is about 0.1 to about 5 percent by weight of the curable composition.