Lexmark International, Inc.

International Business Machines Corporation

Ronald Harold Levin

Scott Thomas Mosier

Weimei Luo

David Glenn Black

Dat Quoc Nguyen

Gregory Walter Haggquist

Jennifer Kaye Neely

Laura Lee Kierstein

James Alan Hartman

Catherine Mailhe Randolph

Tanya Yvonne Thames

Garry Dale Hinch

Franklin Dilworth Zartman

Mark Thomas Bellino

Rudolph Wayne Hrobsky

Vincent Wen-Hwa Ting

Howard W Anderson

Robert Max Lopez, Jr

Kasturei Rangan Srinivasan

Sterritt R Fuller, Jr

Sterritt Ray Fuller, Jr

Weimei Luo Gheleta

Bradford Lee Taylor

A photoreceptor comprising a spectral marker and an electrophotographic printer using the same wherein the presence of the spectral marker is detected by the spectral marker detector, which enables photoreceptor authentication and thickness determinations, thereby permitting adjustment and optimization of component operating parameters within the electrophotographic printer.

Electrophotographic photoreceptor having a spectral marker and electrophotographic printer using the same

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

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.

A method for recycling photoconductors is disclosed. In this method, the charge transport layer is selectively removed from the photoconductor without adversely affecting the electrical properties of the charge generating layer. The recycled drum may then be recoated with a new charge transport layer and reused in an electrophotographic process. In this method, the photoconductor to be recycled is placed in a specifically selected solvent, such as a dibasic ester, and is subjected to ultrasonic energy, preferably for a period not to exceed about 15 minutes.

Selective removal of photoreceptor coatings by ultrasonification

Charge transport layers comprise a charge transport compound and binder including styrene-acrylic resin. Dual layer photoconductors comprise a substrate, a charge transport layer as described, and a charge generation layer.

Dual layer photoconductors with charge transport layer including styrene-acrylic resin

Charge transport layers comprise a hydrazone charge transport compound, Savinyl&reg; yellow and an antioxidant. Dual layer photoconductors comprise the charge transport layer in combination with a substrate and a charge generation layer.

Charge transport layers comprising hydrazones and photoconductors including the same

Azine derivatives or their combinations with hindered phenol antioxidant in the charge transport layer containing one or more triarylamines or a combination of one triarylamine and one hydrazone improve light fatigue of a photoreceptor, which results in stabilized print quality. The robust performance against light damage allows the shutter in a cartridge to be removed and the requirement for special protection procedure during inspection and handling to be simplified.

Electrophotographic photoconductor containing fluorenyl-azine derivatives and triarylamine in transport layer

Charge generation layers for photoconductors comprise a charge generation compound and at least one titanate which improves at least one electrical characteristic of a photoconductor in which the charge generation layer is included. Photoconductors comprise the charge generation layer in combination with a substrate and a charge transport layer.

Charge generation layers comprising at least one titanate and photoconductors including the same

Charge generation layers comprise a charge generation compound and a binder which comprises polyvinylbutyral and phenolic resol. Dual layer photoconductors comprise the charge generation layer in combination with a substrate and a charge transport layer, in which the charge generation layer comprises a charge generation compound and a binder which comprises polyvinylbutyral and phenolic resol. Dual layer photoconductors comprise the charge generation layer in combination with a substrate and a charge transport layer, in which the charge generation layer comprises a charge generation compound and a binder which comprises polyvinylbutyral and a resin selected from the group consisting of phenol novolac and polyhydroxystyrene.

Charge generation layers comprising binder blends and photoconductors including the same

A process for the preparation of triarylamines, wherein the process comprises reacting a diarylamine and a haloaromatic compound in a reaction medium comprising a phase-transfer catalyst and an aromatic solvent.

Preparation of triarylamines

A photoconductor for use in electrophotographic reproduction devices is disclosed. The photoconductor provides simultaneous improvement in both photoreceptor sensitivity and fatigue, while also providing higher charge voltage, lower residual voltage and lower dark decay. The photoconductor of the present invention includes simple quinone additives in either the charge generation layer, the charge transport layer, or both layers. Quinone additives are preferably selected from o-quinone, duroquinone, diphenoquinone, naphthaquinone, and mixtures of those materials, with duroquinone and the mixture E+Z 3, 3'-di-t-butyl-5, 5'-dimethyl diphenoquinones being preferred.

Electrophotographic photoconductor containing simple quinones to improve

Charge generation layers comprise a type I polymorph of titanyl phthalocyanine prepared by pre-milling a type IV polymorph in a media mill. Dual layer photoconductors comprise the charge generation layer in combination with a substrate and a charge transport layer.

Methods for making a charge generating layers comprising type I

Methods of making a charge generation layer comprise premixing a charge generation compound, a charge transport compound and solvent to form a premix essentially free of polymeric binder, mixing the premix with at least one polymeric binder to form a dispersion, and coating the dispersion on a substrate. Photoconductors comprising a substrate, a charge transport layer and a charge generation layer formed by such a method exhibit improved electrical sensitivity.

Methods of making charge generation layers containing charge transport

Photoconductors comprise a substrate, a charge transport layer and a charge generation layer, wherein the charge transport layer comprises binder and a first charge transport compound and the charge generation layer comprises binder, a charge generation compound and a second charge transport compound. The first and second charge transport compounds may be the same or different. In a first embodiment, the second charge transport compound is effective as a dopant in the charge generation layer and the weight ratio of the charge generation compound to the second charge transport compound in the charge generation layer is not less than about 1:3. In a second embodiment, the charge generation layer is formed on the substrate and the charge transport layer is formed on the charge generation layer. In a third embodiment, the charge generation layer comprises at least about 15 weight percent, based on the weight of the charge generation layer, of the charge generation compound.

Dual layer photoconductors with charge generation layer containing

Photoconductors comprise a substrate, a charge transport layer, and a charge generation layer. The charge transport layer comprises binder and a charge transport compound comprising at least one of a hydrazone, aromatic amine, or substituted aromatic amine, and the charge generation layer comprises binder, a phthalocyanine charge generating compound and a hindered hydroxylated aromatic compound. The hindered hydroxylated aromatic compound reduces electrical fatigue upon cycling without adversely effecting the electrical performance of the photoconductors.

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Boulder, CO, United States of America

Ronald Harold Levin