Visibly transparent broadband infrared mirror films having fluoropolymers and 7:1:1:7:1:1 layer thickness ratio

US11298918B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Timothy J. Hebrink · Scandia, US
• Mark B. O'Neill · New Brighton, US
• Stephen J. Kuncio · Saint Paul, US
• Edward J. Kivel · Stillwater, US
• Laurence R. Gilbert · Stillwater, US
• Tracey D. Sorensen · Woodbury, US
• Timothy J. Nevitt · Red Wing, US
• Stephen A. Johnson · Woodbury, US

Key dates

• Filing date: Sep 25, 2017
• Grant date: Apr 12, 2022
• Expiry date: Sep 28, 2038

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B32B2605/006
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Multilayer infrared (IR) reflecting films are provided. An optical repeating unit of the film include a plurality of optical polymeric layers arranged to reflect light by constructive and destructive interference. Optical layer A is a high refractive index polymeric layer, and optical layer B is a low refractive index isotropic polymeric layer containing fluoropolymers. The film has an average reflectance of about 50% to about 100% in a near infrared wavelength range of about 850 nm to about 1850 nm, and an average transmission of about 70% to about 90% in a visible light range.