# US 10,481,512 B2 · Photoconductor having protective overcoat layer with a charge transport molecule with four radical polymerizable hydrophilic functional groups containing an oxygen atom and method of making the same

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- Number: US 10,481,512 B2
- Document ID: US10481512B2
- Status: Granted
- Kind: B2
- Application number: 16/050,321
- Filed: 2018-07-31
- Published: 2018-11-22
- Granted: 2019-11-19
- Earliest claimed: 2013-12-31
- Assignees: Lexmark International, Inc.
- Applicants: Lexmark International, Inc.
- Inventors: David Glenn Black; Mark Thomas Bellino; Weimei Luo
- Web page: https://patentgrep.com/patent/US10481512B2

## CPC

- G03G 7/0006: {Cover layers for image-receiving members; Strippable coversheets}
- G03G 5/0525: {Coating methods}
- G03G 5/0607: {containing at least one non-six-membered ring}
- G03G 5/071: {obtained by reactions only involving carbon-to-carbon unsaturated bonds (G03G5/078 takes precedence)}
- G03G 5/14717: {obtained by reactions only involving carbon-to-carbon unsaturated bonds}
- 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 5/14786: {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 5/14795: {Macromolecular compounds characterised by their physical properties}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An improved organic photoconductor drum used in an electrophotographic image forming device and method to make the same is provided. The organic photoconductor drum contains a protective overcoat. The protective overcoat is prepared from a curable composition including a charge transport molecule containing four radical polymerizable hydrophilic functional groups containing an oxygen atom of the general structure shown below: where R1 and R2 contain a spacer group and a radical polymerizable hydrophilic functional group containing an oxygen atom, R3 and R4 are a non-radical polymerizable functional group, and R5 and R6 contain a spacer group and a radical polymerizable hydrophilic functional group containing an oxygen atom. The curable composition may also contain at least one curing agent. This organic photoconductor drum has excellent wear resistance without negatively altering the electrophotographic properties, thus protecting the organic photoconductor drum from damage and extending its service life.

## Claims

### Claim 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 disposed over the charge transport layer, wherein the overcoat layer includes a cured composition including a charge transport molecule as shown below:
wherein R1 and R2 contain a spacer group and a radical polymerizable hydrophilic functional group containing an oxygen atom, R3 and R4 are a non-radical polymerizable functional group, and R5 and R6 contain a spacer group and a radical polymerizable hydrophilic functional group containing an oxygen atom, and wherein the radical polymerizable hydrophilic functional group containing an oxygen atom of R1 and R2 is selected from the group consisting of acrylate group, methacrylate group, glycidyl ether group and epoxy group.

### Claim 2 (depends on 1)

The organic photoconductor drum of claim 1, wherein the radical polymerizable functional group containing an oxygen atom of R1 and R2 is an acrylate group.

### Claim 3 (depends on 1)

The organic photoconductor drum of claim 1, wherein R3 and R4 are hydrogen atoms.

### Claim 4 (depends on 1)

The organic photoconductor drum of claim 1, wherein the spacer group of R5 and R6 is an unbranched alkyl group containing between 1 and about 6 carbon atoms.

### Claim 5 (depends on 4)

The organic photoconductor drum of claim 4, wherein the unbranched alkyl group containing between 1 and 6 carbon atoms is an ethyl group.

### Claim 6

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 disposed over the charge transport layer, wherein the overcoat layer includes a cured composition including a charge transport molecule as shown below:
wherein R1 and R2 contain a spacer group and a radical polymerizable hydrophilic functional group containing an oxygen atom, R3 and R4 are a non-radical polymerizable functional group, and R5 and R6 contain a spacer group and a radical polymerizable hydrophilic functional group containing an oxygen atom, and wherein the radical polymerizable functional group containing an oxygen atom of R5 and R6 is selected from the group consisting of acrylate group, methacrylate group, glycidyl ether group and epoxy group.

### Claim 7 (depends on 6)

The organic photoconductor drum of claim 6, wherein the radical polymerizable functional group containing an oxygen atom of R5 and R6 is an acrylate group.