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Making Electrophotographic Plates

IP.com Disclosure Number: IPCOM000075304D
Original Publication Date: 1971-Aug-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Kanazawa, KK: AUTHOR [+3]

Abstract

This is a process for preparing electrophotographic plates, wherein the photoconductive element is a layer of realgar. The layer is substantially polycrystalline As(4)S(4) in the high temperature beta crystalline phase and is stable indefinitely at room temperature.

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Making Electrophotographic Plates

This is a process for preparing electrophotographic plates, wherein the photoconductive element is a layer of realgar. The layer is substantially polycrystalline As(4)S(4) in the high temperature beta crystalline phase and is stable indefinitely at room temperature.

Realgar is prepared by heating pure arsenic metal and sulphur together, under vacuum, in a sealed rotating tube. The resulting As(4)S(4) is purified by vacuum sublimation and by zone refining in an inert atmosphere. This is the beta phase realgar normally stable above 267 degrees C.

The material is then evaporated under vacuum at a temperature of 275 degrees C. The vapor is condensed on a substrate maintained at 140 degrees
C. Evaporation time is 40 minutes.

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