PET window film coated with a 6-micron layer containing 30% to 60% by weight infrared-absorbing nanoparticles retains heat while transmitting visible light.

PET window film coated with a 6-micron layer containing 30% to 60% by weight infrared-absorbing nanoparticles retains heat while transmitting visible light. CPFilms in Martinsville, Va., began producing IR-absorbing films three years ago for car windows in the Far East. It has since extended the technology to its Vista architectural window films with different levels of visible-light transmission. CPFilms' parent company, Solutia, has patents on IR-absorbing layers of lanthanum hexaboride, antimony-tin oxide, and indium-tin oxide. Use of these metals in nanoparticle form is CPFilms' development (U.S. Patent 6663950, 2003). Tel: (276) 627-3000 . www.cpfilms.com