Imaging element and method for making a printing plate according to the silver salt diffusion transfer process

摘要

The present invention provides an imaging element comprising (i) a paper support coated at both sides with a hydrophobic polymer layer, (ii) contiguous to a said hydrophobic polymer layer an antistatic layer containing as an essential component a latex of polythiophene with conjugated polymer backbone together with a polymeric polyanion compound and (iii) in the order given on said support a photosensitive layer comprising a silver halide emulsion and in waterpermeable contact therewith an image-receiving layer comprising physical development nuclei, characterized in that a cover layer containing a hydrophilic colloid binder is contiguous to said antistatic layer. According to the present invention there is further provided a method for making a lithographic printing plate comprising the steps of image-wise exposing an imaging element as defined above and subsequently developing a thus obtained imaging element by an alkaline processing liquid in the presence of developing agent(s) and silver halide solvent(s).