Photosensitive compositions containing polyethylene oxide, a phenolic resin, a photosensitive compound and an oxidizing agent

Claim 1

A PLANOGRAPHIC PRINTING PLATE COMPRISING A SUPPORT BASE HAVING COATED THEREON A COMPOSITION CONSISTING ESSENTIALLY OF (1) AN ASSOCIATION PRODUCT OF A NORMALLY SOLID, WATER SOLUBLE ETHYLENE OXIDE POLYMER HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM 50,000 TO 10 MILLION, A PHENOLIC RESIN FORMED BY THE CONDENSATION OF A PHENOLIC COMPOUND AND AN ALDEHYDE, WHEREIN SAID ETHYLENE OXIDE POLYMER IS PRESENT IN AN AMOUNT FROM ABOUT 0.3 TO ABOUT 3 PARTS BY WEIGHT PER PART OF PHENOLIC RESIN, (2) FROM ABOUT 0.08 TO ABOUT 0.2 PART BY WEIGHT PER PART PHENOLIC OF AN ORGANIC, NON-OXIDIZING PHOTOSENSITIZING AGENT WHICH WHEN ACTED UPON BY LIGHT ENERGY AT AMBIENT TEMPERATURES YIELD FREE RADICAL CAPABLE OF REACTION WITH SAID ASSOCIATION PRODUCT AND (3) FROM ABOUT 0.005 TO ABOUT 0.05 PART BY WEIGHT PART PHENOLIC RESIN OF AN OXIDIZING AGENT SELECTED FROM THE GROUP CONSISTING OF AMMONIUM DICHROMATE, CHROMIC OXIDE, FERRIC CHLORIDE, FERRIC NITRATE CUPRIC SULFATE, AMMONIUM PERSULFATE, SODIUM DICHROMATE, POTASSIUM DICHROMATE, STANNIC CHLORIDE, MERCURIC ACETATE, AND CERIC NITRATE.