Electrophotographic photoreceptor, process for production thereof, and image-forming apparatus using same
US6136485A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1998 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | Nov 9, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G5/142
- WIPO fieldOptics
- WIPO sectorInstruments
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 a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.