Patent ID: 8618161

Claim:
A fluorescent polymeric material comprising a polymeric particle and at least one lipid-soluble rhodamine dye comprising the following core structure: wherein R 1 and R 8 are each, independently of one another, selected from the group consisting of hydrogen, (C1-C20) alkyl and halo, or one of R 1 or R 8 is part of an optionally substituted benzo group with R 2 or R 7 , respectively, and the other one of R 1 and R 8 is selected from hydrogen, (C1-C20) alkyl and halo; R 2 is selected from the group consisting of hydrogen, (C1-C20) alkyl and halo, or alternatively, R 2 is taken together with R 1 or R 2â€² to form part of an optionally substituted benzo group; R 2â€² is selected from the group consisting of hydrogen, (C1-C20) alkyl and halo, or alternatively, R 2â€² is taken together with R 2 to form part of an optionally substituted benzo group, or alternatively, R 2â€² is taken together with R 3â€² to form an optionally substituted 5- or 6-membered ring; R 3â€² is selected from the group consisting of hydrogen, and (C4-C20) alkyl, or alternatively R 3â€² is taken together with R 2â€² to form an optionally substituted 5- or 6-membered ring; R 3â€³ is selected from the group consisting of (C4-C20) alkyl, or alternatively R 3â€³ is taken together with R 4 to form an optionally substituted 5-membered ring; R 4 is selected from the group consisting of hydrogen, C1-C20) alkyl and halo, or alternatively R 4 is taken together with R 3â€³ to form an optionally substituted 5-membered ring; R 4â€² is selected from the group consisting of hydrogen, (C1-C20) alkyl and halo; R 5â€² is selected from the group consisting of hydrogen, C1-C20) alkyl and halo; R 5 is selected from the group consisting of hydrogen, C1-C20) alkyl and halo, or alternatively R 5 is taken together with R 6â€³ to form an optionally substituted 5-membered ring; R 6â€² is selected from the group consisting of (C4-C20) alkyl, or alternatively R 6 â€² is taken together with R 7â€² to form an optionally substituted 5-membered ring; R 6â€³ is selected from the group consisting of hydrogen, and (C4-C20) alkyl, or alternatively R 6â€³ is taken together with R 5 to form an optionally substituted 5-membered ring; R 7â€² is selected from the group consisting of hydrogen, (C1-C20) alkyl and halo, or alternatively, R 7â€² is taken together with R 6â€² to form an optionally substituted 5-membered ring, or alternatively, R 7â€² is taken together with R 7 to form part of an optionally substituted benzo group; R 7 is selected from the group consisting of hydrogen, (C1-C20) alkyl and halo, or alternatively, R 7 is taken together with R 7â€² or R 8 to form part of an optionally substituted benzo group; R 11 and R 15 are each hydrogen or are each F or Cl; R 12 , R 13 and R 14 are each hydrogen or are each F or Cl; wherein at least one of R 3â€² , R 3â€³ , R 6â€² and R 6â€³ is a (C4-C20) alkyl; and wherein the lipid-soluble rhodamine dye is incorporated into the polymeric particle non-covalently.