| abstract |
A cured product having excellent releasability, mold reproducibility, adhesion, high refractive index, little curling, and little deformation of a lens shape when subjected to force or temperature change, and a resin composition from which the cured product is obtained Offer things. A polyfunctional (meth) acrylate (a-1) having at least two (meth) acryloyl groups and active hydrogen in the molecule is reacted with an organic polyisocyanate (a-2). It is a reaction product of a functional urethane (meth) acrylate (A), a diol compound (b-1) having a molecular weight of 1000 or less, an aromatic organic polyisocyanate (b-2), and a hydroxyl group-containing (meth) acrylate (b-3). A resin composition comprising urethane (meth) acrylate (B), o-phenylphenol poly (n = 1 to 3) ethoxy acrylate (C) and a photopolymerization initiator (D). |