Photocrosslinkable compositions and presensitised litho plates.

摘要

A water-coateble water-developable photocrosslinkable composition suitable for use in presensitised lithographic printing plates comprises: (1) a non-light-sensitive water-soluble addition polymer containing ethylenically unsaturated groups, (2) a latex copolymer which renders a dried layer of the composition less water-soluble than a layer of (1) alone, and (3) a photoinitiator system. The photoinitiator may be wholly or in part dissolved in the aqueous medium loaded into the latex or chemically bonded to the latex.