PHOTOCURABLE COMPOSITION COMPRISING MALEIC ANHYDRIDE ADDUCT OF POLYBUTADIENE OR BUTADIENE COPOLYMERS

摘要

An aqueous-developable article is made from a photoprepolymer made by reacting a maleated polyalkadienyl homo- or copolymer (e. g., polybutadiene) with an olefinically unsaturated compound capable of opening anhydride rings (e. g., hydroxyethyl methacrylate) with simultaneous chain extension using a polyalkadienyl polyol, followed by hydrolysis and neutralization with Li-, Na-, or K- containing base. When formulated with unsaturated monomers and photoinitiators, the photoprepolymer is particularly useful in making photopolymer-based flexographic printing plates.