Photoconductive and radioconductive compositions and elements containing tetragonal lead monoxide
US4013464A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 3, 1975 |
| Grant date | Mar 22, 1977 |
| Priority date | — |
| Expiry date | Dec 3, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G5/0521
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photoconductive and radioconductive insulating compositions of desirably low dark conductivity and improved resistance to fatigue include tetragonal lead oxide, a binder of polyvinylacetate, polyvinylformal and/or polyvinylbutyral and a small effective amount of an anhydride capable of inhibiting dark conductivity in the composition, particularly under repeated use. Preferred anhydrides are phthalic and maleic anhydrides in an amount of less than about 4 percent of the weight of lead oxide in the composition. Such compositions can be carried on an electrically conductive support to provide elements that are useful for electrophotographic and electroradiographic imaging.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.