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POSITIVE CHARGING VANADYL PHTHALOCYANINE SENSITIZED PHOTORECEPTOR WITH ENHANCED SENSITIVITY AND CYCLING STABILITY

IP.com Disclosure Number: IPCOM000025690D
Original Publication Date: 1987-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 118K

Publishing Venue

Xerox Disclosure Journal

Abstract

Multi le layered electrophotographic imaging members are well known in the art. 8ne specific example of a multiple layered photoreceptor comprises an aluminum ground plane, a transport layer comprising diamine charge transport molecules dispersed in a polycarbonate binder, a charge generation layer comprising vanadyl phthalocyanine particles dispersed in a polyester binder and a protective overcoating comprising vacuum deposited arsenic selenium alloy. This photoreceptor exhibits cycle up in initial charge acceptance, cycle up in rested charge acceptance after cycling, and a change in the photo-induced-discharge-curve shape as a function of cycling. It has been found that the replacement of the polyester resin in the charge generation layer with a polystyrene resin such as Monsanto Lustrex HF777 provides electrophotographic imaging members with substantially increased sensitivity and cycling stability. The charge transport layer and charge generation layer may be formed by spray deposition.

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XEROX DISCLOSURE JOURNAL

POSITIVE CHARGING VANADYL Proposed Classification PHTHALOCYANINE SENSITIZED US. C1.430/60 PHOTORECEPTOR WITH ENHANCED
SENSITIVITY AND CYCLING STABILITY
Clifford H. Grifiths
Joseph Mammino
Paul J. Brach
Donald S. Sypula
Andrew R. Melnyk
Dennis A. Abramsohn

Int. C1. G03g 15/04

Multi le layered electrophotographic imaging members are well known in the art. 8ne specific example of a multiple layered photoreceptor comprises an aluminum ground plane, a transport layer comprising diamine charge transport molecules dispersed in a polycarbonate binder, a charge generation layer comprising vanadyl phthalocyanine particles dispersed in a polyester binder and a protective overcoating comprising vacuum deposited arsenic selenium alloy. This photoreceptor exhibits cycle up in initial charge acceptance, cycle up in rested charge acceptance after cycling, and a change in the photo-induced-discharge-curve shape as a function of cycling. It has been found that the replacement of the polyester resin in the charge generation layer with a polystyrene resin such as Monsanto Lustrex HF777 provides electrophotographic imaging members with substantially increased sensitivity and cycling stability. The charge transport layer and charge generation layer may be formed by spray deposition.

The electrical characteristics of p hotorece p tors comprising polystyrene eneration layers were tested with vanadyl phthalocyanine loading ranges from 10 percent to 35 percent by weight and generation layer thicknesses in the range of 0.75 micrometer to 1.5 micrometers. The generation layer was coated onto a 15 micrometers thick transport layer comprising 35 percent by weight N,N'-diphenyl-N,N'-bis(3-me thy 1 phenyl)-( 1.1'- bi p henyl)-4,4'-diami ne dispersed in Merlon 39 polycarbonate resin. Both the generation layer and transport layer were spray coated from a 1.25 percent solution in a 60/4U mixture of methylene chloride/l,2-dichloroethane. A thin protective arsenic selenium alloy layer was vacuum deposited onto the generation layer. It was found that initial sensitivity was con...