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CHARGE GENERATOR LAYER COMPOSITION FOR PHOTORECEPTOR

IP.com Disclosure Number: IPCOM000026128D
Original Publication Date: 1990-Jun-30
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 178K

Publishing Venue

Xerox Disclosure Journal

Abstract

Polyvinylcarbazole has been used as the binder for trigonal selenium particles in photoreceptor charge generator layers. Polyvinylcarbazole in a tetrahydrofuran and toluene mixture forms good dispersions with trigonal selenium particles and can be applied by roll coating or extrusion dies to produce devices with stable electrical properties. However, these generator layers are preferably employed with an interface adhesive layer in order to obtain the desired adhesion to the underlying blocking layer and ground plane. In conventional photoreceptors containing these materials, maximum adhesion values of the final device are about 25 g/cm at the generator/adhesive layer interface. Better adhesion at the generator layer/blocking layer interface is considered important for flexible belt photoreceptor welded seam integrity in automatic copier, duplicator and printing machines using small diameter rollers, e.g. 19mm, and blade cleaning.

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XEROX DISCLOSURE JOURNAL

CHARGE GENERATOR LAYER Proposed Classification COMPOSITION FOR U.S. C1.430/096 PHOTORECEPTOR Int. C1. G03g 15/05
S. Robinette

M. Allen
A. Lynch

Polyvinylcarbazole has been used as the binder for trigonal selenium particles in photoreceptor charge generator layers. Polyvinylcarbazole in a tetrahydrofuran and toluene mixture forms good dispersions with trigonal selenium particles and can be applied by roll coating or extrusion dies to produce devices with stable electrical properties. However, these generator layers are preferably employed with an interface adhesive layer in order to obtain the desired adhesion to the underlying blocking layer and ground plane. In conventional photoreceptors containing these materials, maximum adhesion values of the final device are about 25 g/cm at the generator/adhesive layer interface. Better adhesion at the generator layer/blocking layer interface is considered important for flexible belt photoreceptor welded seam integrity in automatic copier, duplicator and printing machines using small diameter rollers, e.g. 19mm, and blade cleaning.

Early attempts to use phenoxy resins as a generator layer binder encountered several problems. For example, dispersions formulated with cellosolve acetate presented a safety hazard, had poor shelf life, exhibited a viscosity that was too low to coat well, and had an unpleasant odor which may have been due to H2Se or an organic selenide. These phenoxy generator binder devices, however had excellent adhesion and no interface adhesive layer was required.

A new charge generator layer has been formulated to improve adhesion of the layer to adjacent layers in electrophotographic imaging members. Improved adhesion enhances resistance to photoreceptor delamination during blade cleaning, cycling over small diameter stripper rollers, and the like. It has also been discovered that blends of three polymers produce excellent dispersions, have good coatability, produce films with electrical properties equivalent to commercial photoreceptors and which have generator layer/interfacial layer adhesion values so high that the devices cannot be delaminated to allow lnstron testing. The electrophotographic imaging member photoreceptor containing this new charge generator layer comprises a supporting substrate having an electrically conductive surface, a charge generation layer and a charge transport layer, the charge generation layer comprising a homogeneous dispersion of photoconductive particles of trigonal selenium dispersed in a film forming polymer blend of polycarbonate, polyvinylchloride- polyvinylacetate copolymer and a polymer selected from the group consisting of phenoxy resin, styrene butadiene copolymer and mixtures thereof. The polyvinylchloride-polyvinylacetate copolymer can be a terpolymer of polyvinylchloride-polyvinylacetate-polyvinylalcohol.

XEROX DISCLOSURE JOURNAL - Vol. 15, No. 3 May/June 1990 179

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