Lexmark International, Inc.

Tanya Yvonne Thames

Weimei Luo

Mark Thomas Bellino

Scott Daniel Reeves

James Alan Hartman

David Glenn Black

Dat Quoc Nguyen

Ronald Harold Levin

Brian David Munson

Douglas Harris

Gerald Hugh Ciecior

Michael George Sloan

Weimel Luo

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.

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

An overcoat layer and method to make an overcoated photoconductor drum of an electrophotographic image forming device using irradiation such as with electron beam (EB) or ultraviolet (UV) light is provided. The photoconductor drum is then cured using EB dose of between 10 and 100 kiloGrays (kGy), preferably between 20 and 40 kGys or UV irradiation with an exposure of between 0.1 and 2 J/cm. The unique overcoat layer of the present invention is formed having a biphasic morphology comprised of a highly cured crosslinked phase and a second phase enriched in uncured material. The desired amount of uncured uncrosslinked material found in the second phase of the biphasic structure, is between 2-70 wt % range, with particularly good combination of long-life and electrical performance when present at the 5-50 wt % level, and the best performance at the 15-40 wt % level. The biphasic morphology of the overcoat layer using the method of the present invention gives rise to the good wear rates while allowing rapid transport of the electrical charge and thus fast discharge properties of the photoconductor drum.

Overcoat formulation for long-life electrophotographic photoconductors and method for making the same

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

An electrophotographic photoconductor system for use in an electrophotographic device and method of using the same. The electrophotoconductor system comprises an electroconductive support, a charge generation layer disposed on the electroconductive support, and a charge transport layer disposed on the charge generation layer. The charge generation layer includes a photosensitive material comprising titanyl phthalocyanine, and at least one oligomeric phenylene additive. The electrophotographic photoconductor system is capable of absorbing light having a wavelength of about 350 nm to about 850 nm.

Photoconductor system for electrophotographic device

Embodiments of a photoconductor for use in a printer or printer cartridge comprise an electrically conductive substrate, a charge generation layer disposed over the electrically conductive substrate, and a charge transport layer disposed over the charge generation layer, wherein the charge transport layer comprises charge transport molecules with octyl/decyl glycidyl ether (OGE) or dodecyl/tetradecyl glycidyl ether (DGE), or combinations thereof, added to improve resistance to crazing, cracking and crystallization in the change transport layer.

Control of crazing, cracking or crystallization of a charge transport layer in a photoconductor

The present disclosure relates to incorporation of boron nitride in the charge transport layer of a photoconductor. The boron nitride may have an aspect ratio of greater than 1.0, a D50 mean particle size of less than about 10.0 &#x3bc;m and be present at about 5.0% (wt) or less in the charge transport layer. The cartridge may also include toner particles wherein the toner particles have a size range of about 1-25 &#x3bc;m and an average degree of circularity of about 0.90-1.0. The photoconductor containing boron nitride when used in an electrophotographic printer may then provide acceptable dark decay and/or photoinduced decay (PID) curves relative to photoconductors that do not contain boron nitride along with improved resistance to toner filming.

Photoconductor formulation containing boron nitride

A charge transport composition is provided including a cyclo-aliphatic ether compound. One purpose of the cyclo-aliphatic ether compound is to improve the resistance to crazing, crystallization and etching of the charge transport layer. The charge transport composition may be coated along with a charge generation composition onto a conductive substrate to form a photoconductor. The charge transport composition may therefore be employed in a photoconductor located in a printer or a printer cartridge.

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Aurora, CO, United States of America

Tanya Yvonne Thames