Browse Prior Art Database

DYE TREATMENT OF PHOTOCONDUCTIVE PIGMENTS

IP.com Disclosure Number: IPCOM000023709D
Original Publication Date: 1978-Dec-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 391K

Publishing Venue

Xerox Disclosure Journal

Abstract

This concept relates to an improved process for forming the photoreceptors of the type disclosed in U.S. Patent 3,787,208 (R,N, Jones). This type of photoreceptor employs small particle diameter ( 300 Angstrom units) CdS Sei-pigment uniformly dispersed in a somewhat larger par-icte diameter (about 5 microns) polyester matrix, Using the proper particle size distribution for each in a non-solventvehicle results in pigment chaining by filling the matrix interstices upon fusing, Low volume percent pigment loadings (about 10 percent) are used, The small pigment par-icle size and corresponding high surface to mass ratio (20m /gm) result in the pigment surface being critically important in the photo-receptor performance level,

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

DYE TREATMENT OF PHOTOCONDUCTIVE Proposed Classification

________

                                    U.S. CL 96/L5
R,M, Ferguson mt. CL G03g 5/04
D.C. VonHoene

This concept relates to an improved process for forming the
photoreceptors of the type disclosed in U.S. Patent 3,787,208
(R,N, Jones). This type of photoreceptor employs small
particle diameter ( 300 Angstrom units) CdS Sei~ pigment
uniformly dispersed in a somewhat larger par~icte diameter
(about 5 microns) polyester matrix, Using the proper particle
size distribution for each in a non~solventvehicle results in
pigment chaining by filling the matrix interstices upon
fusing, Low volume percent pigment loadings (about 10
percent) are used, The small pigment par~icle size and
corresponding high surface to mass ratio (20m /gm) result in
the pigment surface being critically important in the photo~-
receptor performance level,

It has been experimentally verified that the small particle
CdSxSe,x, like other II~VI compounds (e.g., ZnO), chemisorbs
ambient species, principally oxygen. The principal effect is
surface band bending and interparticle barriers to transport,
There is also evidence that these surface sites effect photo~
generation through recombination, Since the pigment surface
is so important, altering its properties can dramatically
alter the photoreceptor properties.

Such a surface alternation is proposed by treating the
CdSxSeix pigments with a photosensitive dye, The coating
procedure is as follows: (1) The pigment (about 5 grams) is
premilled with approximately 5 mg of dye in the vehicle,
cyclohexanol, (2) Su...