Browse Prior Art Database

OVERCOATINGS FOR PHOTORECEPTORS

IP.com Disclosure Number: IPCOM000026454D
Original Publication Date: 1992-Feb-29
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 109K

Publishing Venue

Xerox Disclosure Journal

Abstract

The life of multilayered photoreceptors can be extended by protective overcoatings. For multilayered photoreceptors utilizing a hole generating layer and a hole transporting layer containing hole transport molecules, an overcoating preferably should have sufficient hole conductivity to avoid residual charge build-up and at the same time have a very low top surface concentration of charge transport molecules for increased print deletion protection and cracking resistance.

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XEROX DISCLOSURE JOURNAL

OVERCOATINGS FOR PHOTO- Proposed Classification RECEPTORS U.S. C1.430/066 Susan Robinette
Anita P. Lynch
Anthony M. Horgan

Int. C1. G03g 15/04

The life of multilayered photoreceptors can be extended by protective overcoatings. For multilayered photoreceptors utilizing a hole generating layer and a hole transporting layer containing hole transport molecules, an overcoating preferably should have sufficient hole conductivity to avoid residual charge build-up and at the same time have a very low top surface concentration of charge transport molecules for increased print deletion protection and cracking resistance.

It has been found that arylamine charge transport molecules will form a charge transfer complex with polymers such as Ardel* polyarylate and DureP polyarylate. These charge transfer complexes exhibit hole conductivity. Generally, the solvent employed to assist in applying an overcoating of ArdeP polyarylate or Duel@ polyarylate should not adversely affect the underlying charge transport layer. Mere application of an ArdelQ polyarylate overcoating free of arylamine charge transport molecules over a charge transport layer comprising a resin binder and an arylamine charge transport molecule can result in the diffusion of arylamine charge transport molecules from the charge transport layer into the overcoating layer to form charge transfer complexes with the Ardel@ polyarylate.

In one test, a multilayered photoreceptor comprising a supporting layer, an electrically conductive layer, a charge blocking layer, an adhesive layer, a hole generating layer, and a charge transport layer comprising about 50 percent by weight polycarbonate resin and about 50 percent by weight N,N'-diphenyl- N,N'-bis(3''-methylphenyl)-(l,l'-biphenyl)-4,4'-di...