| abstract |
The invention relates to a thermoplastic fluorescent pigment obtained by the condensation of a diisocyanate prepolymer and an aliphatic diamine, a cycloaliphatic diamine or a mixture of a diamine and a polyol in the presence of a fluorescent dye, wherein the prepolymer is obtained by the reaction of an aromatic sulfonamide with an excess of aliphatic, cycloaliphatic and/or or aromatic diisocyanate, and wherein the molar excess of diisocyanate in the prepolymer equals the molar amount of the aliphatic diamine, the cycloaliphatic diamine or the mixture of a diamine and polyol present in the condensation suspension. |