Aqueous processible photosensitive compositions containing core shell microgels

摘要

The present invention concerns an aqueous processible solid photosensitive composition for relief printing plates comprising (a) an addition photopolymerizable ethylenically unsaturated monomer; (b) a photoinitiator or photoinitiating system activated by actinic light; and (c) a core shell microgel binder; wherein the core shell microgel binder has two domains, a core having less than 10% crosslinking and an aqueous processible non-crosslinked outer shell consisting of an acid-modified copolymer, and further wherein the monomer partitions in the shell of the microgel and the shell is grafted to the core using at least 0.1% of a grafting agent. The invention also concerns a photosensitive element containing this composition.