Photoconductor overcoat having radical polymerizable charge transport molecules containing two ethyl acrylate functional groups and urethane acrylate resins containing six radical polymerizable functional groups

Patent metadata

Field	Value
Publication number	US-9360822-B2
Application number	US-201314105436-A
Country	US
Kind code	B2
Filing date	Dec 13, 2013
Priority date	Dec 13, 2013
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

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 triphenylamine charge transport containing two ethyl acrylate functional groups and a urethane resin containing six radical polymerizable functional groups. The amount of the triphenylamine charge transport containing two ethyl acrylate functional groups in the curable composition is about 20 to about 80 percent by weight. The amount of the urethane resin containing six radical polymerizable functional groups in the curable composition is about 20 to about 80 percent by weight. This overcoat layer improves wear resistance of the organic photoconductor drum without negatively altering the electrophotographic properties, thus protecting the organic photoconductor drum from damage and ultimately providing a photoconductor with a longer useful life when compared to other organic photoconductors commercially available.

First claim

What is claimed is:

1. An overcoat layer for an organic photoconductor drum, comprising a curable composition including:
about 20 to about 80 percent by weight of a triphenylamine charge transport molecule containing two ethyl acrylate functional groups as shown below:

wherein R is selected from the group consisting of H and an alkyl group; and
about 20 to about 80 percent by weight of a urethane resin containing six radical polymerizable functional groups.

2. The overcoat layer of claim 1 , wherein the curable composition includes:
about 40 to about 60 percent by weight of a triphenylamine charge transport molecule containing two ethyl acrylate functional groups; and
about 40 to about 60 percent by weight of a urethane resin containing six radical polymerizable functional groups.

3. The overcoat layer of claim 1 , wherein R is a hydrogen atom.

4. The overcoat layer of claim 1 , wherein R is an alkyl group containing 1 to about 6 carbon atoms.

5. The overcoat layer of claim 1 , wherein the radical polymerizable functional group of the urethane resin containing six radical polymerizable functional groups is an acrylate group.

6. The overcoat layer of claim 1 , wherein the urethane resin of the urethane resin containing six radical polymerizable functional groups is an aliphatic urethane resin.

7. The overcoat layer of claim 1 , further comprising a non-radical polymerizable additive on the amount of about 0.1 to about 5 percent by weight of the curable composition.

8. The overcoat layer of claim 1 , wherein a cured curable composition has a thickness of about 0.1 μm to about 10 μm.

9. 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,
a protective overcoat layer formed as an outermost layer of the organic photoconductor drum, the protective overcoat layer being formed from a curable composition including:
about 20 to about 80 percent by weight of a triphenylamine charge transport molecule containing two ethyl acrylate functional groups as shown below:

wherein R is selected from the group consisting of H and an alkyl group; and
about 20 to about 80 percent by weight of a urethane resin containing six radical polymerizable functional groups.

10. The organic photoconductor drum of claim 9 , wherein the curable composition includes:
about 40 to about 60 percent by weight of a triphenylamine charge transport molecule containing two ethyl acrylate functional groups; and
about 40 to about 60 percent by weight of a urethane resin containing six radical polymerizable functional groups.

11. The overcoat layer of claim 9 , wherein R is a hydrogen atom.

12. The overcoat layer of claim 9 , wherein R is an alkyl group containing 1 to about 6 carbon atoms.

13. The organic photoconductor drum of claim 9 , wherein the radical polymerizable functional group of the urethane resin containing six radical polymerizable functional groups is an acrylate group.

14. The overcoat layer of claim 9 , wherein the urethane resin of the urethane resin containing six radical polymerizable functional groups is an aliphatic urethane resin.

15. The organic photoconductor drum of claim 9 , further comprising a non-radical polymerizable additive on the amount of about 0.1 to about 5 percent by weight of the curable composition.

16. The organic photoconductor drum of claim 9 , wherein the overcoat layer has a thickness of about 0.1 μm to about 10 μm.

Assignees

• Lexmark Int Inc

Inventors

• Black David Glenn
• Bellino Mark Thomas
• Hartman James Alan
• Luo Weimei
• Reeves Scott Daniel
• Thames Tanya Yvonne

Classifications

• G03G5/0575

  Other polycondensates comprising nitrogen atoms with or without oxygen atoms in the main chain · CPC title

• G03G15/751 Primary

  relating to drum (G03G15/757 takes precedence) · 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

• G03G5/1473

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

• G03G5/076

  having a photoconductive moiety in the polymer backbone · CPC title