Process of preparing photoconductive layers for electrophotography

Claim 1

A PROCESS OF PRODUCING AN ELECTROPHOTOGRAPHIC PLATE WHICH COMPRISES MIXING TOGETHER IN A BALL MILL ZINC OXIDE, AN AQUEOUS DISPERSION OF A HEAT-HARDENABLE MELAMINE-FORMALDEHYDE FILM-FORMING RESINOUS BINDING AGENT IN AN AMOUNT BETWEEN 0.3 AND 2 PARTS OF THE RESIN PER PART OF THE ZINC OXIDE, TOGETHER WITH A WATERPROOFING SUBSTANCE OF THE GROUP CONSISTING OF (I) AN AQUEOUS EMULSION OF PARAFFIN WAX IN AN AMOUNT BETWEEN 2 AND 12 PERCENT BY WEIGHT OF THE RESINOUS BINDING AGENT BASED ON THE PARAFFIN WAX CONTENT OF THE EMULSION, AND (II) ZIRCONIUM OXYCHLORIDE IN AN AMOUNT BETWEEN 0.1 AND 1 PERCENT BY WEIGHT OF THE RESINOUS BINDING AGENT, AND SUBSEQUENTLY APPLYING THE SAID AQUEOUS DISPERSION TO A CONDUCTIVE SUPPORT IN SUCH AMOUNT THAT THE PHOTOCONDUCTING LAYER DEPOSITED THEREFROM CONTAINS BETWEEN 5 AND 60 GRAMS OF ZINC OXIDE PER SQUARE METER, AND SUBSEQUENTLY DRYING THE SAID COATED CONDUCTIVE SUPPORT.