Fluorescent polymeric articles having screening layer formed from U.V. light absorbing polymer
First Claim
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1. An article comprising;
- (a) a fluorescent polymeric layer comprising a fluorescent dye; and
(b) an ultraviolet light screening layer comprising a polymeric resin, said polymeric resin comprising at least one polymer, or a mixture thereof, selected from the group consisting of;
(i) polymers having a polymeric backbone comprising the following repeating moiety A;
wherein R is a non-interfering substitutent and P is the remainder of the polymer; and
whereby the polymers are able to absorb ultraviolet light; and
(ii) polymers having a polymeric backbone comprising the following repeating moiety B;
wherein R is a non-interfering substituent and P is the remainder of the polymer;
said moiety B being transformable to said moiety A by photo-Fries rearrangement, whereby said polymer comprising moiety B can be transformed to an ultraviolet light absorbing polymer comprising moiety A.
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Abstract
A fluorescent article is disclosed in which a U.V. light screening layer comprising a polymer having in its backbone repeating units of a U.V. light absorbing moiety, or a moiety capable of being transformed by Photo-Fries rearrangement into a U.V. light absorbing moiety, is disposed in operative screening relation to a layer containing a fluorescent colorant. The U.V. light screening layer affords surprisingly improved fluorescence protection as compared to prior U.V. light screening layers having only U.V. light absorbing additives.
91 Citations
64 Claims
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1. An article comprising;
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(a) a fluorescent polymeric layer comprising a fluorescent dye; and
(b) an ultraviolet light screening layer comprising a polymeric resin, said polymeric resin comprising at least one polymer, or a mixture thereof, selected from the group consisting of;
(i) polymers having a polymeric backbone comprising the following repeating moiety A;
wherein R is a non-interfering substitutent and P is the remainder of the polymer; and
whereby the polymers are able to absorb ultraviolet light; and
(ii) polymers having a polymeric backbone comprising the following repeating moiety B;
wherein R is a non-interfering substituent and P is the remainder of the polymer;
said moiety B being transformable to said moiety A by photo-Fries rearrangement, whereby said polymer comprising moiety B can be transformed to an ultraviolet light absorbing polymer comprising moiety A.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
wherein each R1 is independently H or C1-C12 alkyl, p is 0-3, each R2 is independently a divalent organic radical;
m is about 2-200; and
n is about 30-150.
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9. The article of claim 1 in the form of a retroreflective sheeting material.
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10. The article of claim 1 wherein the fluorescent layer further comprises a non-fluorescent colorant.
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11. The article of claim 1 wherein the fluorescent dye is selected from the group consisting of perylene dyes, perylene ester dyes, perylene imide dyes, thioxanthone dyes, thioindigoid dyes, thioxanthene dyes, benzoxanthene dyes, benzothiazine dyes, naphthalimide dyes, coumarin dyes, and mixtures thereof.
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12. The article of claim 11 wherein the fluorescent dye comprises a thioxanthene dye.
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13. The article of claim 12 wherein the thioxanthene dye comprises Solvent Yellow 98.
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14. The article of claim 11 wherein the fluorescent dye comprises a perylene imide or perylene ester dye.
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15. The article of claim 14 wherein the fluorescent dye comprises any one or more of Lumogen F Yellow 083, Lumogen F Orange 240, and Lumogen F Red 300.
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16. The article of claim 11 wherein the fluorescent dye comprises a benzoxanthene dye.
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17. The article of claim 11 wherein the fluorescent dye comprises a benzothiazine dye.
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18. The article of claim 1 wherein the fluorescent layer comprises a polymeric resin selected from the group consisting of polycarbonate, poly(ethylene terephthalate), poly(cyclohexanedimethanol-co-ethylene terephthalate), poly(cyclohexanedimethanol terephthalate), polyarylate, copolyestercarbonate block copolymers containing arylate and carbonate blocks, polyurethanes, polystyrenes, acrylic polymers, polyvinyl chloride, and blends thereof.
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19. The article of claim 18 wherein the fluorescent layer comprises polyarylate.
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20. The article of claim 19 wherein the polyarylate has a polymeric backbone comprising one or both of the following repeating structures:
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21. The article of claim 1 in the form of a fluorescent retroreflective sheeting material comprising:
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a fluorescent layer comprising said polymeric matrix comprising a polyarylate and a fluorescent dye admixed therein; and
a plurality of retroreflective elements.
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22. The article of claim 18 wherein the fluorescent layer comprises a polymeric resin selected from the group consisting of poly(ethylene terephthalate), poly(cyclohexanedimethanol-co-ethylene terephthalate), and mixtures thereof.
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23. The article of claim 19 wherein the fluorescent layer comprises a blend of polyarylate and at least one additional resin selected from the group consisting of polycarbonate, poly(ethylene terephthalate), poly(cyclohexanedimethanol terephthalate), and poly (cyclohexanedimethanol-co-ethylene terephthalate).
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24. The article of claim 23 wherein the fluorescent layer comprises a blend of polyarylate and polycarbonate.
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25. The article of claim 23 wherein the fluorescent layer comprises a blend of polyarylate and poly(ethylene terephthalate).
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26. The article of claim 1 wherein the fluorescent layer comprises one or more additives selected from the group consisting of U.V. absorbing additives and hindered amine light stabilizing additives, wherein said one or more additives is present as an admixture with the polymeric resin in said layer.
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27. The article of claim 1 further comprising a plurality of retroreflective elements selected from the group consisting of microprismatic cube comers and glass microspheres.
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28. The article of claim 27 wherein said retroreflective elements are microprismatic cube corners.
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29. The article of claim 28 wherein said cube comers are formed on a surface of said fluorescent layer.
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30. The article of claim 28 comprising a third polymeric layer, said fluorescent layer being disposed between said screening layer and said third polymeric layer, said cube corners being disposed on the surface of said third polymeric layer opposite said fluorescent layer.
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31. The article of claim 30 comprising a fourth layer disposed in laminar configuration over said screening layer.
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32. The article of claim 27 wherein the retroreflective elements are microspheres in an enclosed lens configuration.
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33. The article of claim 32 wherein said at least one polymer is a polyarylate.
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34. A retroreflective sheeting material comprising:
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(a) a fluorescent polymeric layer comprising a fluorescent dye; and
(b) an ultraviolet light screening layer comprising a polymeric resin, said polymeric resin comprising at least one polymer, or mixture thereof, selected from the group consisting of;
(i) polymers having a polymeric backbone comprising the following repeating moiety A;
wherein R is a non-interfering substitutent and P is the remainder of the polymer; and
whereby the polymers are able to absorb ultraviolet light; and
(ii) polymers having a polymeric backbone comprising the following repeating moiety B;
wherein R is a non-interfering substituent and P is the remainder of the polymer;
said moiety B being transformable to said moiety A by photo-Fries rearrangement in the presence of ultraviolet light, whereby said polymer comprising moiety B can be transformed to an ultraviolet light absorbing polymer comprising moiety A.- View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
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61. An article comprising
(a) a fluorescent polymeric layer comprising a fluorescent dye; - and
(b) an ultraviolet light screening layer comprising a polymeric resin, said polymeric resin comprising at least one polymer, or a mixture thereof, which either is, or is capable of undergoing rearrangement into a U.V. light absorbing polymer material. - View Dependent Claims (62, 63, 64)
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Specification