Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Radiation-sensitive composition or product
Utility Patent
1999-11-04
2001-01-02
Rodee, Christopher D. (Department: 1753)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Radiation-sensitive composition or product
C430S058050, C430S133000, C430S970000, C430S056000
Utility Patent
active
06168893
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an electrophotographic photoconductor and a method for its production. More specifically, the invention relates to an electrophotographic photoconductor for use in a printer, a copier, or a facsimile of the electrophotographic type having a photosensitive layer containing an organic material on a conductive substrate; and a method for producing the electrophotographic photoconductor.
2. Description of the Related Art
An electrophotographic photoconductor is required to have the function of retaining a surface charge in the dark, the function of accepting light to generate a charge, and the function of accepting light to transport a charge. The electrophotographic photoconductors are classified into a single-layered photoconductor with a photosensitive layer which, as a single layer, has all of these functions, and a laminated photoconductor with a photosensitive layer which is a double-layered structure comprising a layer mainly dedicated to charge generation, and a layer contributing to retention of a surface charge in the dark, and to charge transport when accepting light.
To form an image by electrophotography using such an electrophotographic photoconductor, the Carlson process, for example, is used. Image formation by this process is performed by charging by corona discharge to the photoconductor in the dark; formation of an electrostatic image, such as characters or graphics of a document, on the surface of the charged photoconductor; development of the resulting electrostatic image with toner; and transfer, followed by fixation, of the developed toner image onto a support such as paper. The photoconductor after transfer of the toner image is reused after static elimination, removal of the remaining toner, and optical static elimination.
Photosensitive materials so far used in the electrophotographic photoconductors include inorganic photoconductive substances, such as selenium, selenium alloy, zinc oxide, or cadmium sulfide, dispersed in resin binders; organic photoconductive substances, such as poly-N-vinylcarbazole, 9,10-anthracenediolpolyester, hydrazone, stilbene, butadiene, benzidine, phthalocyanine, or bis-azo compounds, dispersed in resin binders; and those photoconductive substances deposited by vacuum evaporation or sublimation.
It is publicly known to add various additives to the photosensitive layer, as desired, thereby improving the electrophotographic characteristics. As examples of phosphorus compound additives, phosphite compounds have been known publicly. Such compounds are disclosed in German Patent Publication No. 3625766.
As described above, various studies have been done on how to improve stability of electrophotographic photoconductors by addition of additives. However, these studies have not been fully successful.
Under these circumstances, it is an object of the present invention to provide an electrophotographic photoconductor improved in stability by using an additive hitherto unknown for addition to electrophotographic photoconductors, and a method for producing the electrophotographic photoconductor in which the stability of a coating liquid for formation of a photosensitive layer has been improved.
SUMMARY OF THE INVENTION
The present inventors conducted extensive studies in an attempt to solve the problems with the prior art. They found, in an electrophotographic photoconductor having a photosensitive layer containing a charge transport material on a conductive substrate, that when an aryloxydiarylphosphine compound was incorporated into the photosensitive layer, the electrophotographic characteristics became markedly stable. Based on this finding, they accomplished an electrophotographic photoconductor according to the present invention.
The inventors also found, in a method for producing an electrophotographic photoconductor including the step of applying a coating liquid containing a charge transport material onto a conductive substrate to form a photosensitive layer, that when an aryloxydiarylphosphine compound was incorporated into the coating liquid, the stability of the coating liquid was markedly improved. Based on this finding, they accomplished a method according to the present invention.
In the first aspect of the present invention, there is provided an electrophotographic photoconductor having a photosensitive layer on a conductive substrate, the photosensitive layer comprising a layer containing a charge transport material and an aryloxydiarylphosphine compound.
Here, the content of the aryloxydiarylphosphine compound may be 0.005 to 20 parts by weight per the 100 parts by weight of the charge transport material and a resin binder in the layer containing the charge transport material and the aryloxydiarylphosphine compound. More preferably, the content of the aryloxydiarylphosphine compound is 0.01 to 10 parts by weight per the 100 parts by weight of the charge transport material and a resin binder in the layer containing the charge transport material and the aryloxydiarylphosphine compound.
The aryloxydiarylphosphine compound may be 2,4-di-tert-butylphenoxydiphenylphosphine or 2,6-di-tert-butylphenoxydiphenylphosphine.
In another aspect of the present invention, there is provided a method for producing an electrophotographic photoconductor, including the step of applying a coating liquid containing a charge transport material onto a conductive substrate to form a photosensitive layer, the method further comprising incorporating an aryloxydiarylphosphine compound into the coating liquid.
The above and other objects, effects, features and advantages of the present invention will become more apparent from the following description of the embodiments thereof taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 3917546 (1975-11-01), Vogl
patent: 4741981 (1988-05-01), Hashimoto et al.
patent: 5945243 (1999-08-01), Nakamura et al.
patent: 3625766 (1987-02-01), None
patent: 9-059193 (1997-03-01), None
“P/O Ligand Systems: Synthesis, Reactivity, and Structure of Tertiary o-Phosphanylphenol Derivatives” Heinicke et al. Chem. Ber, 1996, 129, pp. 1547-1560.
Kina Hideki
Nakamura Yoichi
Ootani Akira
Suzuki Shinjirou
Frank Robert J.
Fuji Electric Imaging Device Co. Ltd.
Rodee Christopher D.
Venable
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