Patent ID: 8580573

Claim:
A process for marking one of a fluid, a fluid blend or a solid composition, the process comprising adding to the one of a fluid, a fluid blend or a solid 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, wherein said reactive polymer is chosen from polyesters and polyether polyols, 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′-dicyclohexylmethanediisocyanate and 1,3-tetramethylene xylene diisocyanate; at an isocyanate index of about 100 or less, wherein the reaction product emits fluorescence in the ultraviolet (UV), visible, or near infrared (IR) region.