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1. (WO2008051650) ARTICLES FLUORESCENTS EN POLYCARBONATE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

What is claimed is:

1. An article comprising at least one fluorescent film layer, the film layer comprising a polymeric matrix comprising polycarbonate; and a blend of fluorescent dyes comprising at least one benzoxanthene dye and at least one benzothiazine dye, wherein the article has selected fluorescent coloration.

2. The article of claim 1 wherein the selected fluorescent coloration of the article is fluorescent yellow-green.

3. The article of claim 1 or 2 wherein the selected fluorescent coloration is fluorescent yellow-green having "x" and "y" chromaticity coordinates bounded by the following coordinates: (x=0.387, y=0.610), (x=0.460, y=0.540), (x=0.421 , y=0.486), and (x=0.368, y=0.539).

4. The article of any one of claims 1 to 3 wherein the at least one film layer has a plurality of retroreflective elements disposed on a surface thereof.

5. The article of any one of claims 1 to 4 further comprising a second layer, the second layer having a plurality of retroreflective elements on a surface thereof.

6. The article of claim 4 wherein the retroreflective elements are microprismatic elements.

7. The article of claim 4 wherein the retroreflective elements are arranged to provide an encapsulated lens retroreflective construction.

8. The article of claim 4 wherein the retroreflective elements are arranged to provide an enclosed lens construction.

9. The article of claim 5 wherein the retroreflective elements are microprismatic elements.

10. The article of claim 5 wherein the retroreflective elements are arranged to provide an encapsulated lens retroreflective construction.

1 1 . The article of claim 5 wherein the retroreflective elements are arranged to provide an enclosed lens construction.

12. The article of claim 4 wherein the article is signage suitable for outdoor use.

13. The article of any one of claims 1 to 12 further comprising a cap layer polymeric film overlying the fluorescent film layer, the cap layer comprising an acrylic resin, a polyarylate resin, or combinations thereof.

14. The article of any one of claims 1 to 13 wherein the benzoxanthene dye is present in an amount of about 0.01 to about 1 .5% by weight of the polymer matrix.

15. The article of any one of claims 1 to 14 wherein the benzothiazine dye is present in an amount of about 0.01 to about 1 .5% by weight of the polymer matrix.

16. A fluorescent yellow-green retroreflective article comprising at least one film layer, the film layer comprising:
a polymer matrix comprising polycarbonate; and
a fluorescent dye blend comprising at least one benzoxanthene dye and at least one benzothiazine dye.

17. The article of claim 16 wherein the at least one film layer has a plurality of retroreflective elements disposed on a surface thereof.

18. The article of claim 16 or 17 wherein the benzoxanthene dye is present in an amount of about 0.01 to about 1.5% by weight of the polymer matrix.

19. The article of any one of claims 16 to 18 wherein the benzothiazine dye is present in an amount of about 0.01 to about 1.5% by weight of the polymer matrix.

20. An article exhibiting durable color and/or fluorescent properties comprising:
a polymeric matrix comprising polycarbonate;
a blend of fluorescent dyes comprising at least one benzoxanthene dye and at least one benzothiazine dye dispersed within the polymeric matrix;
wherein the article exhibits enhanced retention of color and/or fluorescence upon exposure to weathering without the addition of hindered amine light stabilizers or UV absorbers to the polymeric matrix.