Production of photographic polymeric images by heat development

Claim 1

A PHOTOGRAPHIC ELEMENT FOR PRODUCING DIRECT POSITIVE POLYMERIC IMAGES BY EXPOSURE TO ACTINIC RADIATION AND HEAT DEVELOPMENT, CARRYING ON A SUITABLE SUPPORT IN THE FOLLOWING ORDER A FIRST LAYER COMPRISING A COLLOIDAL CARRIER AND IN CONTIGUOUS CONTACT WITH SAID FIRST LAYER A SURFACE LAYER COMPRISING A PHOTOGRAPHIC COLLOID CARRIER MATERIAL, A NORMALLY LIQUID TO SOLID ETHYLENICALLY UNSATURATED MONOMER CONTAINING THE GROUP CH2=C= WHICH IS DIRECTLY ATTACHED TO AN ELECTRONEGATIVE GROUP, ONE OF SAID LAYERS ONLY CONTAINING A THERMAL POLYMERIZATION INITIATOR SELECTED FROM THE GROUP CONSISTING OF ORGANIC PEROXIDES, ALKALI METAL PERSULFATES, ALKALI METAL PERBORATES, A,A''-AZODIISOBUTYRONITRILE, AZODICYCLOHEXYLCARBONITRILE AND A,A''-AZODIISOBUTYRATE, CAPABLE OF INITIATING AND EFFECTING THE POLYMERIZATION OF AN ETHYLENICALLY UNSATURATED MONOMER UPON HEATING, AND THE OTHER LAYER CONTAINING A LIGHT-SENSITIVE AROMATIC DIAZONIUM COMPOUND, THE PHOTODECOMPOSITION PRODUCTS OF WHICH PREVENT POLYMERIZATION OF THE MONOMER WHEN SUBJECTED TO HEAT IN THE PRESENCE OF THE THERMAL INITIATOR.