CURABLE LIQUID RESIN COMPOSITION

摘要

To provide a photocurable resin composition capable of producing a cured product having excellent heat resistance, showing an extremely small amount of deformation, and useful as an optical part. A photocurable resin optical part forming composition, comprising: (A) 20-60 wt % of a urethane (meth)acrylate oligomer obtained by reacting a polyol, a polyisocyanate, and a hydroxyl group-containing (meth)acrylate, the polyol having a branched structure, including a hydroxyl group at each branched chain terminal, and having a value obtained by dividing the molecular weight of the polyol by the number of hydroxyl groups at the branched chain terminals of 100-2,000; (B) 30-70 wt % of a polymerizable monofunctional compound; and (C) 0.01-10 wt % of a radical photoinitiator.