| abstract |
Photopolymerizable compositions comprise (1) 40 to 80% by weight of unsaturated acrylurethane resin prepared by reacting a diisocyanate monomer with polyhydric alcohols, and then reacting said reaction product with a polymerizable acrylate ester or methacrylate ester having a hydroxyl group, (2) 60 to 20% by weight of a polymer which is compatible with said unsaturated acrylurethane resin and is soluble in dilute aqueous alkali solutions or alcohols, and (3) a photo-sensitizer which is capable of hardening said unsaturated acrylurethane resin under irradiation of actinic rays. |