Wednesday, December 19, 2007

US Patent 7309517 - Silica/Zirconia nanoparticles for durable optical film

In order to improve the scratch resistance of brightness enhancing films this patent from 3M teaches the use of silica or zirconia nanoparticles in the film. Claim 1 reads:

1. A durable optical film comprising: a polymerized optical film structure having a microstructured surface and a plurality of substantially fully condensed surface modified colloidal nanoparticles of silica, zirconia, or mixtures thereof.