Photoconductive element based on mixed zinc oxides

Abstract

A photoconductive element giving prolonged service without appreciable deterioration of its properties as the imaging medium in an indirect electrophotograpic copier is obtained by the provision, on an electrically conductive support that preferably is electrically conductive paper coated with a thin layer of hydroxyethyl cellulose, of a photoconductive layer composed essentially of continuous tone zinc oxide and at least one other photoconductive zinc oxide dispersed in a binder consisting predominantly of an organic polymer having an acid number between 10 and 30, such as an acrylic resin or such resin with 1 to 15% of styrene-modified alkyd resin, at a weight ratio of between 5 and 3 parts of zinc oxide per part of binder. The content of continuous tone zinc oxide preferably is limited to a minor proportion amounting to between 6 and 30% of the total zinc oxide content.