Patent ID: 7786184

Claim:
An active energy ray curable resin composition for a sheet-shaped optical article comprising (A) a urethane acrylate compound obtained by reacting hexamethylene diisocyanate, an isocyanurate triisocyanate compound prepared by trimerizing hexamethylene diisocyanate, 2-hydroxypropyl acrylate and pentaerythritol triacrylate, (B) a di(meth)acrylate compound containing no urethane bond and containing two (meth)acryloyl groups in the molecule and (C) a radical photopolymerization initiator, and which is capable of providing a cured material having a dynamic elastic modulus at 25° C. of 950 MPa or less and a dynamic elastic modulus at 60° C. of 100 MPa or more, and in which strong acid is contained at a concentration of less than 100 ppm.