Patent ID: 8486711

Claim:
A liquid, highly fluorescent compound comprising the reaction product of: at least one fluorophore-containing reactive polymer, said reactive polymer being prepared from monomers having no more than one 1,2-epoxide group per molecule, having a molecular weight in the range of 250 to 40,000 Da, and having from 1 to 8 active hydrogen atoms per molecule of reactive polymer, and optionally containing a polyamine unit of the formula NCH 2 CH 2 N; and at least one unsubstituted or substituted aryl isocyanate or an unsubstituted aliphatic or cycloaliphatic isocyanate, wherein said unsubstituted aliphatic or cycloaliphatic isocyanate is selected from the group consisting of 1,6-hexamethylene-diisocyanate, isophorone diisocyanate, 2,4- and 2,6-hexahydrotoluene-diisocyanate and isomeric mixtures thereof, 4,4′-, 2,2′- and 2,4′-dicyclohexylmethaneddiisocyanate and 1,3-tetramethylene xylene diisocyanate; at an isocyanate index of 100 or less, wherein the highly fluorescent compound emits fluorescence in the ultraviolet (UV), visible, or near infrared (IR) region wherein the reactive polymer is chosen from polyesters and polyether polyols.