# US 11,298,918 B2 ยท Visibly transparent broadband infrared mirror films having fluoropolymers and 7:1:1:7:1:1 layer thickness ratio > Agents: this data is available as JSON from the patentgrep API and MCP server โ€” see https://patentgrep.com/llms.txt - Number: US 11,298,918 B2 - Document ID: US11298918B2 - Status: Granted - Kind: B2 - Application number: 16/335,189 - Filed: 2017-09-25 - Published: 2019-12-05 - Granted: 2022-04-12 - Earliest claimed: 2016-09-30 - Assignees: 3M Innovative Properties Company - Applicants: 3M Innovative Properties Company - Inventors: Timothy J. Hebrink; Mark B. O'Neill; Stephen J. Kuncio; Edward J. Kivel; Laurence R. Gilbert; Tracey D. Sorensen; Timothy J. Nevitt; Stephen A. Johnson - Web page: https://patentgrep.com/patent/US11298918B2 ## CPC - B32B 17/06: comprising glass as the main or only constituent of a layer, next to another layer of a specific {material} - B32B 7/02: Physical, chemical or physicochemical properties - B32B 7/04: Interconnection of layers - B32B 7/12: using interposed adhesives or interposed materials with bonding properties - B32B 27/06: as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)} - B32B 27/08: of synthetic resin - B32B 27/20: using fillers, pigments, thixotroping agents - B32B 27/285: {comprising polyethers} - B32B 27/304: {comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF} - B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} - B32B 27/322: {comprising halogenated polyolefins, e.g. PTFE} - B32B 27/325: {comprising polycycloolefins} - B32B 27/36: comprising polyesters - G02B 5/0841: {comprising organic materials, e.g. polymers} - G02B 5/281: {designed for the infrared light} - G02B 5/282: {reflecting for infrared and transparent for visible light, e.g. heat reflectors, laser protection} - B32B 2250/05: 5 or more layers - B32B 2250/24: All layers being polymeric - B32B 2250/42: Alternating layers, e.g. ABAB(C), AABBAABB(C) - B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer - B32B 2255/26: Polymeric coating - B32B 2255/28: Multiple coating on one surface - B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers - B32B 2307/206: Insulating - B32B 2307/402: Coloured - B32B 2307/412: Transparent - B32B 2307/416: Reflective - B32B 2307/418: Refractive - B32B 2307/42: Polarizing, birefringent, filtering - B32B 2307/708: Isotropic - B32B 2307/732: Dimensional properties - B32B 2419/00: Buildings or parts thereof - B32B 2605/006: Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## 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. ## Claims ### Claim 1 A multilayer infrared (IR) reflecting film comprising: an optical repeating unit comprising a plurality of polymeric layers arranged to reflect light by constructive and destructive interference, the plurality of optical polymeric layers including optical layers A and B, the optical layer A being a high refractive index polymeric layer, and the optical layer B being a low refractive index isotropic polymeric layer comprising one or more fluoropolymers comprising tetrafluoroethylene (TFE) and hexafluoropropylene (HFP), wherein the plurality of polymeric layers of the optical repeating unit are arranged in an order ABABAB with the thickness ratio of about 7:1:1:7:1:1, wherein the film has an average reflectance from about 82% to about 100% in an entire near infrared wavelength range of about 850 nm to about 1850 nm, wherein the film has an average transmission from about 70% to about 90% in a visible light range, and wherein the optical layer A absorbs less than 1% light in an ultraviolet (UV) wavelength range of about 350 nm to about 400 nm. ### Claim 2 (depends on 1) The film of claim 1, wherein the optical layer B comprises about 30 mol % to about 80 mol % of tetrafluoroethylene (TFE), and about 20 mol % to about 70 mol % of hexafluoropropylene (HFP). ### Claim 3 (depends on 1) The film of claim 1, wherein the optical layer B comprises about 30 mol % to about 75 mol % of tetrafluoroethylene (TFE), 5 mol % to about 30 mol % of hexafluoropropylene (HFP), less than about 55 mol % of vinylidene fluoride (VDF), and less than about 15 mol % of perfluoropropylvinyl ether (PPVE). ### Claim 4 (depends on 1) The film of claim 1, wherein the optical layer B comprises about 35 mol % to about 80 mol % of tetrafluoroethylene (TFE), about 5 mol % to about 50 mol % of hexafluoropropylene (HFP), and less than about 15 mol % of perfluoropropylvinyl ether (PPVE). ### Claim 5 (depends on 1) The film of claim 1, wherein the optical layer A comprises polyester. ### Claim 6 (depends on 1) The film of claim 1, wherein the optical layer A comprises polyethylene terephthalate (PET). ### Claim 7 (depends on 1) The film of claim 1, wherein the optical layer A comprises polymethylmethacrylate (PMMA). ### Claim 8 (depends on 1) The film of claim 1, wherein an in-plane refractive index of the optical layer A is about 0.26 to about 0.32 greater than an in-plane refractive index of the optical layer B. ### Claim 9 (depends on 1) The film of claim 1, wherein the polymeric layer B has an in-plane refractive index in a range of about 1.34 to about 1.40. ### Claim 10 (depends on 1) The film of claim 1, wherein the polymeric layer A has an in-plane refractive index in a range of about 1.62 to about 1.68. ### Claim 11 (depends on 1) The film of claim 1, wherein the film has CIE (L*, a*, b*) color coordinates with โˆ’5.0