UV stabilized multi-layer structures with detectable UV protective layers and a method of detection
US5783307A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 1996 |
| Grant date | Jul 21, 1998 |
| Priority date | — |
| Expiry date | Nov 4, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31507
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.