Hoechst Aktiengesellschaft

Dietmar Koenneke

Andreas Elsaesser

Klaus Joerg

Hans W Frass

Rudolf Neubauer

Ernst-August Hackmann

A radiation-sensitive recording material, in particular for producing planographic printing plates, is disclosed. The material is composed of a layer support and a positive-working, radiation-sensitive layer having a rough surface containing at least one 1,2-quinonediazide as a radiation-sensitive compound, a polycondensate or polymer as a binder insoluble in water and soluble or swellable in aqueous-alkaline solutions, a dye and a filler. At a layer weight of 3 g/m.sup.2 or less, the radiation-sensitive layer comprises a silicic acid product having a mean grain size in the range from 3 to 5 .mu.m with an exclusion limit of 15 .mu.m as a filler in such a quantity that it exhibits a Bekk smoothness in the range from 20 to 100 seconds (determined according to DIN 53 107, Method A). The layer additionally comprises a surfactant having polysiloxane units. The recording material shows good copying properties and technical printing properties, such as an advantageous evacuation time, screen evenness, low susceptibility to air occlusions, good resolving power and a good coating structure. The invention also relates to a process for producing a planographic printing plated, using the recording material according to the invention.

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Taunusstein, Germany

Dietmar Koenneke