Hoechst Aktiengesellschaft

Peter Riedel

Engelbert Pliefke

Juergen Lingnau

Klaus-Peter Schoen

Klaus Schmitt

Printing forms or metallized images can be prepared electrophotographically by a process comprising the electrostatic chargeup, imagewise exposure and tonering of a photoconductor layer applied to an electroconductive base material, followed by fixing of the tonered image areas, removal of the photoconductive layer in the non-image areas by decoating and, where appropriate, etching of the bared base material surface. A recording material is used that comprises a photoconductive layer containing at least one organic n-conducting pigment in a concentration between 10 and 50 percent by weight and an organic p-conducting photoconductor in a concentration of 0 to 20 percent by weight, based on the layer weight, together with a binder which is soluble or dispersible in aqueous-alkaline solution. The decoating is carried out with an aqueous-alkaline decoater solution, which preferably contains alkali metal hydroxides and/or phosphates. The decoating is preferably carried out at an elevated temperature, for example, between about 30.degree. to 60.degree. C.

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Huenfelden, Germany

Peter Riedel