Electrophotographic photoreceptor, process for production thereo

Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Radiation-sensitive composition or product

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430131, G03G 514

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061364851

ABSTRACT:
The object of the invention is to provide a highly characteristic and lesser defective image using an electrophotographic photoreceptor which can be produced with a better coating property and which is highly sensitive and hardly loses the electrostatic stability during repeated use. A water-soluble or water/alcohol-soluble polyvinyl acetal and an inorganic pigment are involved in an underlayer provided between a conductive support and a photoconductive layer. Particularly, it is favorable to use titanium oxide as the inorganic pigment, make the ratio of polyvinyl acetal/titanium oxide 1/9-9/1 by weight, make the underlayer 0.5-5 .mu.m in thickness, use the titanium oxide of which the surface is treated with alumina, use the titanium oxide of which the titanium oxide component is 95% by weight or lower and of which the surface is treated with alumina, use the polyvinyl acetal of which the sodium ion concentration is 40 ppm or lower, and use the photo-conductive layer which contains a vinyl chloride-vinyl acetate type copolymer. As for a dispersing medium for coating the underlayer, water/alcohol=1/9-7/3 (ratio by weight) is selected. The aforementioned photoreceptor is applied to an image-forming apparatus using an inversion development process.

REFERENCES:
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patent: 5804343 (1998-09-01), Umeda et al.
Database WPI, Section Ch, Week 8649, Derwent Publications Ltd., London, GB; Class A14, AN 86-322972 XP002099146 & JP 61 240247 A (Canon KK) Oct. 25, 1986.
Database WPI, Section Ch, Week 8822, Derwent Publications Ltd., London, GB; Class A89, AN 88-151080 XP002099147 & JP 63 091665 A (RICOH KK) Apr. 22, 1988.
Database WPI, Section Ch, Week 9039, Derwent Publications Ltd., London, GB; Class A89, AN 90-294355 XP002099148 & JP 02 207268 A (Fuji Xerox Co Ltd) Aug. 16, 1990.
Patent Abstracts of Japan, vol. 096, No. 010, Oct. 31 1996 & JP 08 166677 A (Mitsubishi Paper Mills Ltd) Jun. 25, 1996.

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