Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Radiation-sensitive composition or product
Patent
1993-10-13
1996-05-28
Lesmes, George F.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Radiation-sensitive composition or product
430 96, 528202, G03G 1502, G03G 500, C08G 6414
Patent
active
055210414
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a novel polycarbonate, a method of preparing the polycarbonate and an electrophotographic photoreceptor produced by using the polycarbonate. More specifically, the present invention relates to an electrophotographic photoreceptor which maintains outstanding mechanical strength, such as high surface hardness, and excellent electrophotographic properties for a long period and is useful in various application fields of electrophotography.
BACKGROUND ART
Polycarbonates have been used as materials in various fields, and as their application fields have become wider, there has arisen a demand for the development of polycarbonates having improved properties.
The electrophotographic photoreceptors that have recently been proposed and used include (1) layered-type organic electrophotographic photoreceptors, the photosensitive layers of which contain at least two layers, namely a charge generation layer for generating charge by exposure and a charge transport layer for transporting the charge, and (2) single-layer-type electrophotographic photoreceptors, the photosensitive layers of which are single layers where charge generating materials and charge transporting materials are dispersed in resins. As the resins contained in the charge transport layer of the layered-type electrophotographic photoreceptors and in the photosensitive layer of the single-layer-type electrophotographic photoreceptors, polycarbonate resins prepared from bisphenol-A have been widely used.
Since polycarbonate resins prepared from bisphenol-A have good compatibility with charge transporting materials, photoreceptors whose photosensitive layer contains such polycarbonate resins are characterized by their good electrical properties and their relatively high mechanical strength.
However, the photoreceptors produced by using the polycarbonate resins prepared from bisphenol-A have been found to involve some problems, including the following problems (1) and (2).
(1) In the production of such photoreceptors, their photosensitive layers are formed by applying a coating liquid dissolved in a solvent, and some solvents make the coating liquid get cloudy (to gel) or make the photosensitive layer crystallize easily. This causes quality defects of developed images since photo-induced discharge hardly occurs on the crystallized regions, leaving residual charges which cause an undesirable electric potential on the regions.
(2) In the case of general negatively-charged-type electrophotographic photoreceptors, their photosensitive layer formed by using the polycarbonate resins derived from bisphenol-A tends to be peeled off from their base layer due to poor adhesion to the base layer, or is worn or scored for lack of surface hardness, thereby shortening plate wear life. Herein, the base layer generally indicates the charge generation layer of layered-type photoreceptors, or the electroconductive substrate of single-layer-type photoreceptors.
DISCLOSURE OF INVENTION
An object of the present invention is to solve the problems involved in the conventional electrophotographic photoreceptors produced by using the polycarbonate resins derived from bisphenol-A and to provide a practically advantageous electrophotographic photoreceptor which can be produced without the clouding (gelatin) of the coating liquid and maintains excellent mechanical strength, such as good plate wear, and good electrophotographic properties for a long period.
Another object of the present invention is to provide a novel and functionally excellent polycarbonate of a novel structure and a method of preparing the same which is a suitable component for the photosensitive layer of the above-described electrophotographic photoreceptor and is also useful as an EL (electroluminescent) material.
The inventors studied to solve the problems, and they consequently found that an electrophotographic photoreceptor, the photosensitive layer of which contained a polycarbonate structurally characterized by its fluorine-containing end groups, could over
REFERENCES:
patent: Re27682 (1973-06-01), Schnell et al.
patent: 3036040 (1962-05-01), Lee et al.
patent: 5213924 (1993-05-01), Sakamoto
English Translation of European Patent 4,103,530 Fennhoff et al. Aug. 13, 1992.
Miyamoto Hideyuki
Morishita Hironobu
Nagao Tomohiro
Sakamoto Shuji
Codd Bernard P.
Idemitsu Kosan Co. Ltd.
Lesmes George F.
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