Patent ID: 8318888

Claim:
Two-photon active cross-linked polyurethane compositions derived from the polymerization of (i) a difunctional isocyanato monomer, (ii) a trifunctional isocyanato monomer, or (iii) mixtures thereof; and a polyhydroxy tris(diarylamino-9,9-dialkylfluorenyl)-1,3,5-triazine with the following structure: wherein R is a linear or branched alkyl group, —C m H 2m+1 , where m is from 1 to 6, or an alkylether group, —(CH 2 CH 2 O) p Me, where p is from 1 to 5, wherein the R′—(OH) x groups are attached to the phenyl rings of the triarylamine moiety either in a para or a meta position, R′ is a linear or branched alkyl group, and wherein X is from 1 to 3.