PHOTOPOLYMERIZABLE BLOCK COPOLYMER COMPOSITION

摘要

An elastomeric composition for making a printing plate comprising (A) a tapered di-block copolymer of a vinyl aromatic hydrocarbon and a diene hydrocarbon; (B) an ethylenically unsaturated photopolymerizable crosslinking agent; and (C) an effective amount of an addition polymerization initiator activatable by actinic radiation. A method for forming a solvent soluble elastomeric printing relief having a Shore A hardness of 42 or less is also described.