A light-sensitive mixt. comprises (a) a diazonium salt polycondensation prod. and (b) a non-light-sensitive polymeric binder with pendant COOH gps. which is soluble or at least swellable in aq. alkaline soln., and which is a reaction prod. of an intramolecular anhydride (I) of an organic polycarboxylic acid (Ia) with an OH gp. contg. polymer (II) which contains no further functional gps. which are reactive w.r.t. acid anhydrides. The binder also contains pendant urethane gp. contg. substits. formed by reaction of organic isocyanates (III) with OH gps. in the polymer. 
LICHTEMPFINDLICHES GEMISCH AUF BASIS EINES DIAZONIUMSALZ-POLYKONDENSATIONSPRODUKTS UND DARAUS HERGESTELLTES LICHTEMPFINDLICHES AUFZEICHNUNGSMATERIAL.