Light sensitive copying material containing a diazonium salt polycondensation product in a fish glue binder

Abstract From the Canadian patent

This invention relates to an improvement in a tight-sensitive copying material the copying layer of which comprises a water-soluble curable binder and a diazonium salt polycondensation product of recurring units of the general types (A-N2X) and (B) which are linked to one another by intermediate members which have two bonds and are derived from a carbonyl compound capable of undergoing a condensation reaction wherein A is the radical of a compound which contains at least two isocyclic or heterocyclic aromatic rings and is able to undergo a condensation reaction, at least at one point in the molecule with formalde-, hyde in an acid medium B is the radical of a compound which is free of …