an improved planographic printing plate comprised of a metal substrate , a sealing layer , an interlayer formed from a monomer or polymer of an organic compound having at least one cationic , quaternary substituted ammonium group , and a photosensitive layer on the surface of the interlayer . the printing plates are water developable and characterized by cleaner non - imaging areas during printing operations . the method of preparing such planographic printing plates is also described and illustrated .