| abstract |
To provide a UV-curable resin composition useful for forming an optical member such as an optical lens, particularly a Fresnel lens of a micro-display type projection television. A radiation-curable resin optical member forming composition comprising (A) 5 to 70 wt% of a urethane (meth)acrylate having a structure shown by the following formula (1), and (B) 10 to 70 wt% of an ethylenically unsaturated group-containing compound other than the component (A). Formula (1) : [R1-O-CONH-R2-NHCO]n-R3 wherein R1 represents a (meth)acryloyl group or an alkyl group having 1 to 4 carbon atoms, R2 represents a divalent organic group having an aromatic ring, R3 represents an organic group having 2 to 20 carbon atoms and a valence of 2 to 6, and n represents an integer from 2 to 6; R1S may differ from each other on condition that 40 to 85 mol% of R1 is a (meth)acryloyl group and 15 to 60 mol% of R1 is an alkyl group having 1 to 4 carbon atoms. |