Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Radiation-sensitive composition or product
Patent
1995-04-14
1996-10-29
Goodrow, John
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Radiation-sensitive composition or product
430 96, G03G 505
Patent
active
055695663
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a photoreceptor for electrophotography, and more specifically, to a photoreceptor for electrophotography having a photoconductive layer containing a particular polycarbonate resin.
BACKGROUND ART
Now, electrophotographic arts are widely applied to copying machines and various printers owing to their high speed and high quality of picture.
Hitherto, as a photoreceptor for electrophotography in the electrophotographic arts, inorganic photoconductive materials including selenium, selenium/tellurium alloys, selenium/arsenic alloys, cadmium sulfide, etc., have been mainly used.
However, recently, from the standpoints of toxicity, safety, price, productivity, etc, photoreceptors for electrophtography used organic photoconductive materials have been developed.
When the organic photoconductive material is a low molecular substance, usually a coating film is formed by blending it with a binder resin. The binder resin for use includes various thermoplastic resins and thermosetting resins including vinyl polymers such as polymethylmethacrylate, polystyrene, polyvinyl chloride, etc., and copolymers thereof, polycarbonate, polyester, polysulfone, phenoxy resin, epoxy resin, silicone resin, etc. Among these various resins, polycarbonate resins are frequently used as the binder resin since they have comparatively excellent characteristics.
As examples using polycarbonate resins as a binder resin, for example, there are disclosed polycarbonate resin being derived from bisphenol Z in JP-A 59-71057, polycarbonate resin being derived from bisphenol A in JP-A 63-170647, polycarbonate resin being derived from dimethylbisphenol A in JP-A 63-148263, and polycarbonate resin being derived from bisphenol AP in JP-A 4-44048, which are used as a binder resin.
However, although some photoreceptors for electrophotography obtained by using these known organic photoconductive materials and various binder resins are equivalent to those used inorganic photoconductive materials in sensitivity, etc., they are still insufficient in a quality of picture, etc., and have a problem of generation of minute black spots (pin holes), etc.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a photoreceptor for electrophotography in which no minute black spots generate.
The present inventors have made extensive study to improve the above-mentioned drawbacks in a photoreceptor for electrophotography. As a result, a considerable proportion of chlorine was detected in the portion in which minute black spots generated.
It is considered that the chlorine has its origin in the contamination of phosgene or chlorine-containing organic solvents during synthesis of polycarbonate.
Since free chlorine of about 2 to 10 ppm is detected in conventional polycarbonates, the present inventors thought that there was some causality between free chlorine and minute black spots and found that a photoreceptor for photography able to remarkably inhibit generation of minute black spots could be obtained by using a particular polycarbonate resin as a binder resin. The present invention has been accomplished on the basis of above finding.
That is, the present invention provides a photoreceptor for electrophotography which comprises a conductive substrate and a photoconductive layer on the conductive substrate, a polycarbonate resin containing free chlorine of 2 ppm or below being contained in the photoconductive layer.
Moreover, the present invention provides a photoreceptor for electrophotography which comprises a conductive substrate and a charge generation layer and a charge transport layer on the conductive substrate, a polycarbonate resin containing free chlorine of 2 ppm or below being contained in the charge transport layer.
The present invention will be described in detail below.
The photoreceptor for electrophotography in the present invention has a photoconductive layer being composed of a charge generation material, a charge transport material, and a binder resin, if necessary, further h
REFERENCES:
patent: 4315063 (1982-02-01), Fukuda et al.
patent: 5139908 (1992-08-01), Akasaki et al.
Patent Abstract of Japan vol. 18 No. 600 (P-1826), 15 Nov., 1994 & JP-A-06 222582 (Fuji Xerox) 12 Aug. 1994.
Kanayama Satoshi
Ogawa Noriyoshi
Tajima Jun
Goodrow John
Mitsubishi Gas Chemical Company Inc.
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