go FILING sensitive and heat and lithographic plate coated with said composition composition.

sensitive to IR radiation and to heat of the positive type comprising a polymeric binder and a solubility inhibitor capable of insoluble the heat-sensitive composition in alkaline developing bath as long as the composition has not been exposed to heat or radiation composition IR and solubilize the composition in said developer bath after exposure to heat or IR radiation, wherein said solubility inhibitor is a polymer or hydroxylated acrylic copolymer, characterized in that some hydroxyl groups of said polymer or copolymer have been esterified with a carboxylic acid or a reactive derivative thereof.