Photosolubilizable compositions containing novolac phenolic resin

摘要

Radiation-sensitive elements, e.g. printing plates, comprising a substrate having coated thereon a photosolubilizable composition comprising an alkali-soluble phenolic resin and an onium salt. The onium salt imparts a solvent resistance to the phenolic resin which is removed upon exposure to radiation thereby providing a solubility differential between exposed and unexposed areas of the composition.