Printing plate compositions

Claim 1

A PHOTOSENSITIVE COMPOSITION CONSISTING ESSENTIALLY OF (1) A HEAT FUSIBLE PHENOLIC RESIN, (2) FROM ABOUT 0.2 TO 3 PARTS PER PART PHENOLIC RESIN OF AN ETHYLENE OXIDE POLYMER HAVING AN AVERAGE MOLECULAR WEIGHT FROM ABOUT 50,000 TO ABOUT 10,000,000, (3) FROM ABOUT 0.08 TO ABOUT 0.2 PART PER PHENOLIC RESIN OF A PHOTOSENSITIZING AGENT WHICH WHEN ACTED UPON BY LIGHT ENERGY AT AMBIENT TEMPERATURES YIELDS FREE RADICALS CAPABLE OF REACTION WITH THE RESINOUS COMPONENTS OF THE COMPOSITION WHEREIN SAID PHOTOSENSITIVE COMPOSITION BECOMES MORE OLEOPHILIC ON EXPOSURE TO LIGHT, (4) FROM ABOUT 1 TO ABOUT 50 WEIGHT PERCENT BASED UPON THE WEIGHT OF THE PHENOLIC RESIN OF A NON-OXISIZING, PHOTO-INSENSITIVE, BASIC COMPOUND WHICH EXHIBITS A PH GREATER THAN 7, AND (5) AN AMOUNT UP TO ABOUT 0.4 PART PER PART PHENOLIC RESIN OF A PLYHYDRIC AROMATIC COMPOUND CONTAINING FROM 6 TO 12 CARBON ATOMS AND FROM 2 TO 4 AROMATIC HYDROXYL GROUPS SO DISPOSED THAT SAID PLYHYDRIC AROMATIC COMPOUND CONTAINS AT LEAST 2 REACTIVE AROMATIC HYDROGEN ATOMS.