Patent ID: 7981987

Claim:
A process for preparing olefinically unsaturated aromatic urethanes, the process comprising the step of A) reacting one or more aromatic polyisocyanates with B) one or more isocyanate-reactive compounds having at least one radiation-curable olefinically unsaturated double bond, C) one or more isocyanate-reactive compounds which contain no radiation-curable olefinically unsaturated double bonds, D) optionally one or more nanoparticulate fillers and E) optionall y one or more stabilizers, wherein the olefinically unsaturated aromatic urethanes have a refractive index at λ=532 nm of ≧1.5, and wherein the one or more isocyanate-reactive compounds in C) are selected from the group consisting of 9-(2-hydroxyethyl)-9H-carbazole, hydroxymethylnaphthalene, N-(2-hydroxyethyl)phthalimide, 2-phenylethanol,(p-chloro)phenylethanol, 2-(p-chlorophenyl)ethanol, triphenylmethanol, naphthalenethiomethanol, and mixtures thereof.