UV stabilized multi-layer structures with detectable UV protecti

Details UV stabilized multi-layer structures with detectable UV protecti UV stabilized multi-layer structures with detectable UV protecti

1996-11-04

1998-07-21

Hoke, Veronica P.

Stock material or miscellaneous articles

Composite

Of polycarbonate

2503361, 250372, 2504611, 359350, 359361, B32B 2736, G01J 142, G01J 100, G01N 2164, F21V 906, G02B 520

Patent

active

057833079

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.

REFERENCES:
patent: 4238384 (1980-12-01), Blumberg et al.
patent: 4446262 (1984-05-01), Okumura et al.
patent: 4861630 (1989-08-01), Mihalich
patent: 5264539 (1993-11-01), Shepherd
patent: 5270116 (1993-12-01), Melancon et al.
patent: 5387458 (1995-02-01), Pavelka et al.
patent: 5445872 (1995-08-01), Suhadolnik et al.
patent: 5605761 (1997-02-01), Barns et al.
Helv. Chim Acta, 63, 413-19 (1980).

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