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Fluorescent polymeric articles having screening layer formed from U.V. light absorbing polymer

A polymer, ultraviolet light technology, applied in synthetic resin layered products, equipment for electrical recording process using charge patterns, layered products, etc., can solve the problem of not considering interaction, etc.

Inactive Publication Date: 2004-02-04
AVERY DENNISON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One can randomly select any UV absorber that blocks most of the UV light below 400 nm wavelength (see, for example, Japanese Patent Laid-Open No. 2-16042, Application No. 63-165914 (Koshiji et al.) and U.S. Patent No. 5,387,458 ( Pavelka et al.)) did not take into account the potential interaction between the UV absorber in the shielding layer and the fluorescent dye present in the colored layer

Method used

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  • Fluorescent polymeric articles having screening layer formed from U.V. light absorbing polymer
  • Fluorescent polymeric articles having screening layer formed from U.V. light absorbing polymer
  • Fluorescent polymeric articles having screening layer formed from U.V. light absorbing polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0072] The UV light shielding layer used in each of the following examples was an extruded 2 mil polyarylate film. However, it should be understood that the UV light shielding layer may be any transparent film containing a polyarylate or a polymer having a similar molecular structure to the polyarylate, and blends thereof such as polyarylate / polycarbonate co- blends, polyarylate / PET blends, polyarylate / PETG blends, and polymers (and blends thereof) containing the UV absorbing moieties A and / or B defined above. The fluorescent film formula in each embodiment is to use C.W.Brabender Plasti-Corder Prep-Mixer (made by C.W.Brabender Instruments, Inc.of Hackensack, NJ manufacture), by the melt mixing of polymer resin and additive, then use The heated Carver press converts to about 4-6 mil films. The mixing temperature used is in the range of about 230-300°C, depending on the resin. The Brabender speed was 100 rpm and the mixing time used was in the range of about 3-6 minutes. The...

Embodiment l

[0075] This example demonstrates the ability of a polyarylate barrier layer to protect the fluorescence and color durability of a fluorescent polycarbonate layer, with and without UV light protection additives and fluorescent dyes. The polycarbonate resin particles used were Calibre-302 from Dow Chemical Company blended with 0.25% by weight of HALS (Tinuvin 622 from Ciba). In samples 1.2a, 1.2b and 1.4a, 1.4b, the polycarbonate layer also contained 0.3% by weight of Tinuvin 234 (Ciba) UV absorber. The fluorochromes used were Huron Yellow D-417 and Lumofast Yellow 3G (LF-3G), both obtained from Day-Glo Color Corporation, Cleveland, Ohio. In these examples, D-417 and LF-3G were used in the polycarbonate layer at 0.08 and 0.8% by weight, respectively. The polyarylate films used in the barrier layer are commercially available as extruded films sold under the trade designation "Ardel" by Westlake Plastics Company, Lenni, Pennsylvania. The accelerated weathering results are shown ...

Embodiment 2

[0082]This example demonstrates that a polyarylate shield is made from PETG and contains dyes "Hostasol Yellow 3G" (HY-3G) from Clariant, "Lumogen Yellow 083" (LY-083) from BASF, and "Lumogen Yellow 083" (LY-083) from Day - The ability of the fluorescent layer of any of Glo's "Lumofast Yellow 3G" (LF-3G) to impart improved durability of fluorescent properties. The PETG resin used was "Eastar GN-071" from Eastman Chemical, Kingsport, Tennessee. In samples 2.1a, 2.1b the fluorescent layer was a blend of PETG with 0.45% by weight of Hostasol Yellow 3G. In samples 2.2a, 2.2b, the fluorescent layer was a blend of PETG with 0.8 wt% Lumofast Yellow 3G. In samples 2.3a, 2.3b, the fluorescent layer was a blend of PETG with 0.25 wt% Lumogen Yellow083. No photostabilizers or UV absorbing additives were incorporated into the PETG / fluorescent layer. The weathering results are shown in Table 2.

[0083] Table 2

[0084] protected with a polyarylate ("PAL") shield

[0085] ...

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Abstract

A flurorescent 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 fluoresence protection as compared to prior U.V. light screening layers having only U.V. light absorbing additives.

Description

technical field [0001] The present invention generally relates to fluorescent multilayer polymeric articles having a UV light shielding layer to protect the fluorescent color stability of the fluorescent layer. More particularly, the present invention relates to articles, preferably comprising a plurality of reflective units, in which the fluorescent polymer layer is protected by a polymeric UV light shielding layer made of a UV light absorbing polymer or capable of being rearranged into Polymer Preparation of UV Absorbing Polymers. Background technique [0002] Reflective sheets are widely used in traffic and road safety signs. Such flakes are typically provided as polymeric monolayer or multilayer flake materials with thousands of reflective elements, such as microprismatic cube prisms or glass beads, which reflect incident light. It is well known to incorporate one or more fluorescent dyes into reflective flakes to enhance the visibility of articles such as pavement mar...

Claims

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Application Information

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IPC IPC(8): B32B27/08B32B27/18B32B27/28C08L51/08C08L53/00C08L67/02C08L67/03C08L69/00G09F13/20
CPCB32B27/08C08L53/00B32B27/28C08L67/03C08L69/00G09F13/20C08L51/08C08L67/02C08L69/005B32B27/18C08L2666/18C08F263/02
Inventor G·-X·韦D·J·布尼K·A·多库斯
Owner AVERY DENNISON CORP
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