# US 9,435,923 B2 · Infrared shielding film > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,435,923 B2 - Document ID: US9435923B2 - Status: Granted - Kind: B2 - Application number: 14/118,722 - Filed: 2012-05-17 - Published: 2015-05-14 - Granted: 2016-09-06 - Earliest claimed: 2011-05-20 - Assignees: Konica Minolta, Inc. - Applicants: Junichi Kohno; Takahiko Nojima - Inventors: Junichi Kohno; Takahiko Nojima - Web page: https://patentgrep.com/patent/US9435923B2 ## CPC - G02B 5/26: Reflecting filters (G02B5/28 takes precedence) - G02B 1/04: made of organic materials, e.g. plastics (G02B1/08 takes precedence) - G02B 5/206: {comprising particles embedded in a solid matrix} - G02B 5/208: {for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation} - Y10T 428/24942: including components having same physical characteristic in differing degree - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract An infrared shielding film has at least one unit on a substrate, the unit having a low refractive index layer that contains first metal oxide particles and a first binder and a high refractive index layer that is arranged adjacent to the low refractive index layer, contains second metal oxide particles and a second binder, and has a higher refractive index than the low refractive index layer, in which at least one layer of the low refractive index layer and the high refractive index layer contains, as a binder, at least one of the following (a) to (c): (a) a carboxyvinyl polymer that contains a monomer component, which contains a carboxylic acid, in an amount of 20 to 75% by mass of the entire composition, (b) a copolymer having pH dependency of viscosity, and (c) a modified polyvinyl alcohol. ## Claims ### Claim 1 An infrared shielding film comprising on a substrate at least one unit having: a low refractive index layer that contains first metal oxide particles and a first binder; and a high refractive index layer that is adjacent to the low refractive index layer, contains second metal oxide particles and a second binder, and has a higher refractive index than the low refractive index layer, wherein at least one layer of the low refractive index layer and the high refractive index layer contains, as a binder, at least one of the following (a) to (c): (a) a carboxyvinyl polymer that contains a monomer component, which contains a carboxylic acid, in an amount of 20 to 75% by mass of an entire composition of the carboxyvinyl polymer; (b) a copolymer having pH dependency of viscosity; and (c) a modified polyvinyl alcohol which is a copolymer obtained by copolymerization of (1) a polyvinyl alcohol having an average polymerization degree of 200 to 2400 and (2) at least one type of polymerizable vinyl monomer selected from the group consisting of an unsaturated carboxylic acid, a salt of the unsaturated carboxylic acid, and an ester of the unsaturated carboxylic acid. ### Claim 2 (depends on 1) The infrared shielding film according to claim 1, wherein the at least one layer of the low refractive index layer and the high refractive index layer contains (c) the modified polyvinyl alcohol. ### Claim 3 (depends on 2) The infrared shielding film according to claim 2, wherein (1) the polyvinyl alcohol having the average polymerization degree of 200 to 2400 and (2) the at least one type of polymerizable vinyl are copolymerized at mass ratio of 0.5:9.5 to 9.5:0.5. ### Claim 4 (depends on 3) The infrared shielding film according to claim 3, wherein the polymerizable vinyl monomer is at least one type of monomer selected from the group consisting of acrylic acid, methacrylic acid, fumaric acid, maleic acid, itaconic acid, and a salt thereof, and an unsaturated carboxylic acid ester represented by the following formula (I): CH2═C(R1)—COOR2 (I) wherein R1 represents a hydrogen atom or a methyl group and R2 represents an alkyl group with 1 to 4 carbon atoms. ### Claim 5 (depends on 4) The infrared shielding film according to claim 4, wherein the polymerizable vinyl monomer is a mixture of acrylic acid or a salt thereof and methyl methacrylate, and the mass ratio of acrylic acid or a salt thereof to methyl methacrylate is 3:7 to 0.5:9.5 (acrylic acid or a salt thereof:methyl methacrylate). ### Claim 6 (depends on 2) The infrared shielding film according to claim 2, wherein a content of the modified polyvinyl alcohol is 5 to 45% by mass with respect to the total binder amount of a layer containing the modified polyvinyl alcohol. ### Claim 7 (depends on 1) The infrared shielding film according to claim 1, wherein the at least one layer of the low refractive index layer and the high refractive index layer contains (a) the carboxyvinyl polymer that contains a monomer component, which contains a carboxylic acid, in an amount of 20 to 75% by mass of the entire composition. ### Claim 8 (depends on 7) The infrared shielding film according to claim 7, wherein a content of the carboxyvinyl polymer is 0.2 to 5.0% by mass with respect to the total binder amount of a layer containing the carboxyvinyl polymer. ### Claim 9 (depends on 1) The infrared shielding film according to claim 1, wherein the at least one layer of the low refractive index layer and the high refractive index layer contains (b) the copolymer having pH dependency of viscosity. ### Claim 10 (depends on 9) The infrared shielding film according to claim 9, wherein the copolymer having pH dependency of viscosity is a copolymer consisting of at least a monomer having vinyl amide and a monomer having vinyl carboxylic acid. ### Claim 11 (depends on 10) The infrared shielding film according to claim 10, wherein the vinyl amide is at least one monomer selected from vinyl pyrrolidone, vinyl caprolactam, N-vinyl formamide, N-vinyl acetamide, N-vinyl-N-methylacetamide, and a mixture thereof. ### Claim 12 (depends on 10) The infrared shielding film according to claim 10, wherein the vinyl carboxylic acid is at least one monomer selected from (metha)acrylic acid, crotonic acid, itaconic acid, maleic acid, and a mixture thereof. ### Claim 13 (depends on 9) The infrared shielding film according to claim 9, wherein the copolymer having pH dependency of viscosity is a copolymer which is polymerized using a cross linking agent having at least two polymerizable free radical groups in the molecule. ### Claim 14 (depends on 13) The infrared shielding film according to claim 13, wherein the cross linking agent is at least one compound selected from pentaerythritol triallyl ether, pentaerythritol triacrylate, pentaerythritol tetraacrylate, and methylene bisacrylamide. ### Claim 15 (depends on 9) The infrared shielding film according to claim 9, wherein a content of the copolymer having pH dependency of viscosity is 0.2 to 4.0% by mass with respect to the total binder amount of a layer containing the copolymer. ### Claim 16 (depends on 1) The infrared shielding film according to claim 1, wherein the low refractive index layer has pores. ### Claim 17 (depends on 1) The infrared shielding film according to claim 1, wherein (c) the modified polyvinyl alcohol is at least one of non-ion modified polyvinyl alcohol and anion modified polyvinyl alcohol. ### Claim 18 (depends on 1) The infrared shielding film according to claim 1, wherein a transmittance of the visible light is 50% or more and a reflectance is 50% or more at a wavelength of 900 to 1,400 nm. ### Claim 19 An infrared shielding film comprising on a substrate at least one unit having: a low refractive index layer that contains first metal oxide particles and a first binder; and a high refractive index layer that is adjacent to the low refractive index layer, contains second metal oxide particles and a second binder, and has a higher refractive index than the low refractive index layer, in which at least one layer of the low refractive index layer and the high refractive index layer contains, as a binder, at least one of ethylene modified polyvinyl alcohol, a carboxylic acid modified polyvinyl alcohol, diacetone modified polyvinyl alcohol, and thiol modified polyvinyl alcohol.