UV stabilized multi-layer structures with detectable UV protective layers and a method of detection
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United States of America Patent
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Jul 21, 1998
Grant Date -
N/A
app pub date -
Nov 4, 1996
filing date -
Nov 4, 1996
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Abstract
A UV stabilized multi-layer structure which has an easily visible UV protective layer comprises a UV protective layer and an underlying polymeric layer. The polymeric layer is either a polyester or a polycarbonate. The UV protective layer, which is exposed to UV radiation and protects the polymeric layer, comprises a UV absorbing compound, an optical brightener present in an amount sufficient to cause visual illumination of the UV protective layer upon exposure to a light source and a polymeric base material of either a polyester, polycarbonate or acrylic. Upon exposure to a UV light or white light source the UV protective layer is visibly illuminated. A method of detecting the UV protective layer in the UV stabilized multi-layer structure is also provided.
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