Two component infrared reflecting film
AssigneeThe Dow Chemical Company
InventorsCharles B. Arends, Walter J. Schrenk, Ray A. Lewis, Ravi Ramanathan, John Wheatley
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Abstract
The present invention provides a two-component infrared reflecting film which reflects light in the infrared region of the spectrum while suppressing second, third and fourth order reflections in the visible spectrum. The film comprises alternating layers of first (A) and second (B) diverse polymeric materials having a six layer alternating repeat unit with relative optical thicknesses of about .778A.111B.111A.778B.111A.111B. The polymeric materials differ from each other in refractive index by at least about 0.03.
Claims33
A two component infrared reflecting film comprising alternating layers of first (A) and second (B) diverse polymeric materials, said first and second polymeric materials differing in refractive index by at least about 0.03, wherein said first and second polymeric materials have a six alternating layer repeating unit with relative optical thicknesses of about .778A.111B.111A.778B.111A.111B, wherein at least 50% of visible light of wavelengths of between about 380-770 nm incident on said film is transmitted and at least 50% of infrared light of wavelengths of between about 770-2000 nm is reflected.
A two component infrared reflecting film which reflects light in the infrared wavelength region of between about 770-2000 nm while suppressing second, third, and fourth order reflections in the visible wavelength region of between about 380-700 nm, said film comprising alternating layers of first (A) and second (B) diverse polymeric materials, said first and second polymeric materials differing in refractive index by at least about 0.03, wherein said first and second polymeric materials have a six alternating layer repeating unit with relative optical thicknesses of about .778A.111B.111A.778B.111A.111B.
A two component infrared reflecting film in which at least 50% of visible light between about 380-770 nm incident on said film is transmitted and at least 50% of infrared light of wavelengths between about 770-2000 nm is reflected, said film comprising alternating layers of first (A) and second (B) diverse polymeric materials differing in refractive index by at least about 0.03, wherein a first portion of said alternating layers comprises a six alternating layer repeating unit with relative optical thicknesses of about .778A.111B.111A.778B.111A.111B and reflects infrared light of a wavelength between about 1200-2000 nm;
- and wherein a second portion of said alternating layers having a repeating unit AB reflects infrared light of a wavelength between about 770-1200 nm.
Dependencies are inferred from the claim text.