Electrophotosensitive copy-sheet

Claim 1

A FLEXIBLE PHOTOCONDUCTIVE COPY SHEET HAVING A THIN, UNIFORM PHOTOCONDUCTIVE LAYER COMPRISING ZINC OXIDE PARTICLES FIRMLY HELD TO A SMOOTH CONTINUOUS FLEXIBLE ALUMINUM LAYER BY A SUBSTANTIALLY WATER-INSOLUBLE INSULATIVE ORGANIC RESINOUS BINDER HAVING A LOW DEGREE OF WETTABILITY TOWARD SAID ZINC OXIDE PARTICLES IN SUCH A MANNER THAT THERE IS A LOWERMOST STRATUM OF ZINC OXIDE PARTICLES DIRECTLY CONTACTING SAID ALUMINUM LAYER AND SUBSTANTIALLY ALL ZINC OXIDE PARTICLES IN SAID PHOTOCONDUCTIVE LAYER ARE IN DIRECT CONTACT WITH ADJACENT ZINC OXIDE PARTICLES, SAID ALUMIMUM LAYER OVERLAYING AND BEING ATTACHED TO AN ELECTRICAL INSULATING, FLEXIBLE BACKING SHEET, THE AMOUNT OF SAID ZINC OXIDE PARTICLES IN SAID PHOTOCONDUCTIVE LAYER BEING SUCH THAT AN ELECTRICALLY CONDUCTIVE PATH IS CREATED BETWEEN THE OUTER SURFACE OF SAID PHOTOCONDUCTIVE LAYER AND SAID ALUMINUM LAYER UPON IRRADIATION OF SAID PHOTOCONDUCTIVE LAYER, AND SAID ALUMINUM LAYER BEING OF SUCH CLEANNESS AND SAID ZINC OXIDE PARTICLES BEING OF SUCH PHOTOCONDUCTIVE LAYERS HAVE A CONBINDED ALIMINUM AND PHOTOCONDUCTIVE LAYERS HAVE A CONDUCTIVELY OF AT LEAST ABOUT 10-7 MHO/CM. ON EXPOSURE TO LIGHT AND A CONDUCTIVELY IN THE DARK NOT GREATER THAN ABOUT ONE-TWENTH OF THE CONDUCTIVELY ON EXPOSURE TO LIGHT.