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Browse Prior Art Database

HIGHLY LOADED CHARGE GENERATOR LAYERS FOR PHOTO- RECEPTORS

IP.com Disclosure Number: IPCOM000026105D
Original Publication Date: 1990-Apr-30
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 107K

Publishing Venue

Xerox Disclosure Journal

Abstract

The use of pigmenthinder combinations in charge generator layers (CGL) in various multilayered photoreceptor devices containing a charge generator layer and a charge transport layer (CTL) is well known. In some embodiments, it has been demonstrated that thin CGL layers highly loaded with photoconductive pigment are desirable, but the application techniques for forming coatings from pigment dispersions may constrain the ability to achieve smooth uniform layers. For example, in devices in which a CGL overlies a CTL, application of a thin CGL by spray coating has been shown to create irreducible background in points made on a Xerox 4045 printer.

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XEROX DISCLOSURE JOURNAL

HIGHLY LOADED CHARGE GEN- ERATOR LAYERS FOR PHOTO- RECEPTORS Int. C1. G03g 5/00 Richard H. Nealey

Proposed Classification
U.S. C1.430/134

The use of pigmenthinder combinations in charge generator layers (CGL) in various multilayered photoreceptor devices containing a charge generator layer and a charge transport layer (CTL) is well known. In some embodiments, it has been demonstrated that thin CGL layers highly loaded with photoconductive pigment are desirable, but the application techniques for forming coatings from pigment dispersions may constrain the ability to achieve smooth uniform layers. For example, in devices in which a CGL overlies a CTL, application of a thin CGL by spray coating has been shown to create irreducible background in points made on a Xerox 4045 printer.

A new process has been conceived in which a thin, highly loaded CGL coating is prepared by initially applying photoconductive pigment particles dispersed only in appropriate solvents and thereafter applying a layer containing photoconductive pigment particles dispersed in a film forming binder solution to create a thin CGL highly loaded with photoconductive pigment particles.

In a typical spray coating process for a device in which a CGL overlies a CTL, a CGL containing, for example, 1 percent solids content of 40 weight percent vanadyl phthalocyanine particles dispersed in 60 weight percent polyester dissolved in methylene chloride and 1,2-dichloroethane can be applied to the upper surface of a charge transporting layer (CTL) to achieve an optical density of 1.2 with four passes of the spray gun, i.e., each pass deposits an optical density of 0.3. Optical density can be easily correlated to coating thickness if the ratio of polymer bind...