Film with UV-barrier properties
US6815482B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 2001 |
| Grant date | Nov 9, 2004 |
| Priority date | — |
| Expiry date | May 10, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L23/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention is directed to a thin packaging film made out of a thermoplastic material with anti-UV properties, characterized in that its composition further comprises a combination of at least one organic compound with at least one inorganic UV-absorbent compound, for improved barrier against UV rays, and improved transparency. Preferably, the organic compound is a benzotriazole, and the inorganic compound is micronized zinc oxide. More preferably, the material for the film further comprises a binder compound, for example a benzophenone, in order to improve the compatibility between the organic component and the base-resin. Preferably, the film thickness is below 80 &mgr;m, more preferably below 35 &mgr;m.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.