Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Radiation-sensitive composition or product
Reexamination Certificate
2000-05-30
2001-09-11
Goodrow, John (Department: 1753)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Radiation-sensitive composition or product
C430S058650, C430S059400, C430S064000
Reexamination Certificate
active
06287737
ABSTRACT:
Disclosed in U.S. Pat. No. 5,874,193, the disclosure of which is totally incorporated herein by reference, are photoconductive imaging members, with a hole blocking layer comprised of a crosslinked polymer derived from crosslinking a alkoxysilyl-functionalized polymer bearing an electron transporting moiety. In U.S. Pat. No. 5,871,877, the disclosure of which is totally incorporated herein by reference, are illustrated multilayered imaging members with a solvent resistant hole blocking layer comprised of a crosslinked electron transport polymer derived from crosslinking a thermally crosslinkable alkoxysilyl, acyloxysilyl or halosilyl-functionalized electron transport polymer with an alkoxysilyl, acyloxysilyl or halosilyl compound, such as alkyltrialkoxysilane, alkyltrihalosilane, alkylacyloxysilane, aminoalkyltrialkoxysilane, and the like; illustrated in U.S. Pat. No. 5,482,811, the disclosure of which is totally incorporated herein by reference, are imaging members with photogenerating pigments of, for example, Type V hydroxygallium phthalocyanine. Advantages of the imaging members of the present invention with respect to U.S. Pat. No. 5,871,877 include, for example, a more rapid crosslinking rate, for example, in embodiments less than about one minute, and water can be added to accelerate the crosslinking reaction. Decreased crosslinking or curing times of, for example, 1 minute is particularly important for web-coating of photoreceptor belts as the coating operation is continuous and usually does not tolerate undue delay in the fabrication of the blocking layer. The hole blocking layer of the present invention also enables the resulting photoreceptor to exhibit excellent electrical properties such as high low residual potential voltage and stable cyclic characteristics in various environmental conditions.
Illustrated in U.S. Pat. No. 5,493,016, the disclosure of which is totally incorporated herein by reference, are imaging members comprised of a supporting substrate, a photogenerating layer of hydroxygallium phthalocyanine, a charge transport layer, a perylene photogenerating layer, which is preferably a mixture of bisbenzimidazo(2,1-a-1′,2′-b)anthra(2,1,9-def:6,5,10-d′e′f′)diisoquino-line-6,11-dione and bisbenzimidazo(2,1-a:2′,1′-a)anthra(2,1,9-def:6,5,10-d′e′f′)diisoquinoline-10, 21-dione, reference U.S. Pat. No. 4,587,189, the disclosure of which is totally incorporated herein by reference; and as a top layer a second charge transport layer.
Also, in U.S. Pat. No. 5,473,064, the disclosure of which is totally incorporated herein by reference, there is illustrated a process for the preparation of hydroxygallium phthalocyanine Type V, essentially free of chlorine, whereby a pigment precursor Type I chlorogallium phthalocyanine is prepared by the reaction of gallium chloride in a solvent, such as N-methylpyrrolidone, present in an amount of from about 10 parts to about 100 parts, and preferably about 19 parts with 1,3-diiminoisoindolene in an amount of from about 1 part to about 10 parts, and preferably about 4 parts of DI
3
, for each part of gallium chloride that is reacted; hydrolyzing said pigment precursor chlorogallium phthalocyanine Type I by standard methods, for example acid pasting, whereby the pigment precursor is dissolved in concentrated sulfuric acid and then reprecipitated in a solvent, such as water, or a dilute ammonia solution, for example from about 10 to about 15 percent; and subsequently treating the resulting hydrolyzed pigment hydroxygallium phthalocyanine Type I with a solvent, such as N,N-dimethylformamide, present in an amount of from about 1 volume part to about 50 volume parts and preferably about 15 volume parts for each weight part of pigment hydroxygallium phthalocyanine that is used by, for example, ball milling the Type I hydroxygallium phthalocyanine pigment in the presence of spherical glass beads, approximately 1 millimeter to 5 millimeters in diameter, at room temperature, about 25° C., for a period of from about 12 hours to about 1 week, and preferably about 24 hours.
Also, illustrated in U.S. Pat. No. 5,645,965, the disclosure of which is totally incorporated herein by reference, are symmetrical perylene photoconductive members.
The appropriate components and processes of the above patents may be selected for the present invention in embodiments thereof.
BACKGROUND OF THE INVENTION
This invention is generally directed to imaging members, and more specifically, the present invention is directed to multilayered photoconductive imaging members with a hole blocking layer comprised of a crosslinked polysiloxane derived from crosslinking a trialkoxysilyl-functionalized hydroxyalkyl acrylate or trialkoxysilyl-functionalized hydroxyalkyl acrylate with an aminoalkylalkoxysilane, such as gammaaminoalkyltrialkyloxysilane, and wherein the presence of a hydroxyalkyl moiety enables the addition of water to the coating solution without substantially causing phase separation, and wherein the curing or crosslinking of the hole blocking layer can be accelerated. The hole blocking layer is preferably in contact with a supporting substrate and is preferably situated between the supporting substrate and the photogenerating layer preferably comprised of the photogenerating pigments of U.S. Pat. No. 5,482,811, the disclosure of which is totally incorporated herein by reference, especially Type V hydroxygallium phthalocyanine. The imaging members of the present invention in embodiments exhibit excellent cyclic/environmental stability, and substantially no adverse changes in their performance over extended time periods, and also the imaging members can comprise a solvent resistant hole blocking layer enabling the coating of a subsequent photogenerating layer thereon without structural damages, and which blocking layer can be easily coated on the supporting substrate by various coating techniques of such as, for example, dip or slot-coating. The aforementioned photoresponsive, or photoconductive imaging members can be negatively charged when the photogenerating layer is situated between the hole transport layer and the hole blocking layer deposited on the substrate.
Processes of imaging, especially xerographic imaging and printing, including digital, are also encompassed by the present invention. More specifically, the layered photoconductive imaging members of the present invention can be selected for a number of different known imaging and printing processes including, for example, electrophotographic imaging processes, especially xerographic imaging and printing processes wherein charged latent images are rendered visible with toner compositions of an appropriate charge polarity. The imaging members as indicated herein are in embodiments sensitive in the wavelength region of, for example, from about 500 to about 900 nanometers, and in particular from about 650 to about 850 nanometers, thus diode lasers can be selected as the light source. Moreover, the imaging members of this invention are preferably useful in color xerographic applications.
PRIOR ART
Layered photoresponsive imaging members have been described in numerous U.S. patents, such as U.S. Pat. No. 4,265,990, the disclosure of which is totally incorporated herein by reference, wherein there is illustrated an imaging member comprised of a photogenerating layer, and an aryl amine hole transport layer. Examples of photogenerating layer components include trigonal selenium, metal phthalocyanines, vanadyl phthalocyanines, and metal free phthalocyanines. Additionally, there is described in U.S. Pat. No. 3,121,006 a composite xerographic photoconductive member comprised of finely divided particles of a photoconductive inorganic compound dispersed in an electrically insulating organic resin binder. The binder materials disclosed in the '006 patent comprise a material which is incapable of transporting for any significant distance injected charge carriers generated by the photoconductive particles.
The use of perylene pigments as photoconduct
Carmichael Kathleen M.
Chambers John S.
Hsiao Cheng-Kuo
Liu Ping
Ong Beng S.
Goodrow John
Palazzo E. O.
Xerox Corporation
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