Patent ID: 8623499

Claim:
A roofing article, comprising: an essentially opaque substrate at least partially surmounted by at least one thin film having an average thickness in the range of from about 20 nm to about 500 nm, the at least one thin film comprising at least one population of nanoparticles residing in a matrix, the matrix having a first refractive index, the at least one population of nanoparticles having a second refractive index, at least one of the population of nanoparticles having at least one characteristic dimension in the range of from about 10 nm to about 500 nm, the at least one thin film transmitting at least about 5% of radiation having a wavelength of between about 300 nm and about 700 nm, and the at least one thin film reflecting at least about 20% of radiation having a wavelength of between about 700 nm and about 2500 nm.