Patent ID: 7091257

Claim:
A colored oligomer for providing color to a coating on a communications element, said colored oligomer comprising the reaction product of: (a) an isocyanate end-capped oligomer; and (b) a radiation-curable monomer having both (i) a reactive functionality which is reactive with isocyanate and (ii) ethylenic unsaturation, wherein said colored oligomer is end-capped with radiation-curable groups by covalent linkages formed by reacting said reactive functionality (i) of said radiation-curable monomer (b) with an isocyanate moiety of said isocyanate end-capped oligomer (a), and said isocyanate end-capped oligomer (a) is the reaction product of: (c) at least one polyfunctional compound having at least two isocyanate reactive groups: and (d) at least one polyisocyanate, said polyfunctional compound (c) comprising at least one dye having at least two isocyanate reactive functionalities, wherein said dye is an anthraquinone dye, and said anthraquinone dye has the formula or said anthraquinone dye is selected from the group consisting of 1,5-bis((3-hydroxy-2,2-dimethylpropyl)amino)-9,10-anthracenedione; 2,2′-((9,10-dihydro-9,10-dioxo-1,5-anthracenediyl)bis(thio))bis-benzoic acid, 2-hydroxyethyl ester; and 1,5-bis((2,2-dimethyl-3-hydroxypropyl)amino)-4,8-bis((4-methylphenyl)thio) anthraquinone.