# US 10,479,872 B2 · Antifogging film > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,479,872 B2 - Document ID: US10479872B2 - Status: Granted - Kind: B2 - Application number: 15/919,724 - Filed: 2018-03-13 - Published: 2018-07-19 - Granted: 2019-11-19 - Earliest claimed: 2015-09-14 - Assignees: FUJIFILM Corporation - Applicants: FUJIFILM Corporation - Inventors: Yui Matsuura; Syougo Katano; Toshiya Mita; Akihiro Ikeyama - Web page: https://patentgrep.com/patent/US10479872B2 ## CPC - C08J 5/18: Manufacture of films or sheets - C08B 3/16: Preparation of mixed organic cellulose esters {, e.g. cellulose aceto-formate or cellulose aceto-propionate} - C08B 3/24: Hydrolysis or ripening - C08L 1/10: Esters of organic acids {, i.e. acylates} - C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) - C09K 3/18: for application to surfaces to minimize adherence of ice, mist or water thereto (rendering particulate materials free flowing, in general, e.g. making them hydrophobic B01J2/30); Thawing or antifreeze materials for application to surfaces (used in liquids for heat-transfer, heat-exchange or heat-storage or for the production of heat or cold other than by combustion, e.g. radiator liquids, C09K5/00) - C08J 2301/10: Esters of organic acids - C08L 2203/16: used for films - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - C08B: POLYSACCHARIDES; DERIVATIVES THEREOF (polysaccharides containing less than six saccharide radicals attached to each other by glycosidic linkages C07H; fermentation or enzyme-using processes C12P19/00; sugar industry C13; production of cellulose D21) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE ## Abstract An antifogging film includes a film base and a saponified layer. The film base is formed of cellulose triacetate as cellulose acylate. The saponified layer is provided on a first base surface of the film base and serves as a first film surface of the antifogging film. The saponified layer contains saponified cellulose triacetate. The antifogging film is configured such that the first film surface has a contact angle of 20° or less 15 seconds after dropping of pure water thereto. In a case where the amount of acyl groups of the first film surface is X and the amount of acyl groups of a second base surface is Y, an acyl group ratio obtained by X/Y is 0.7 or less. ## Claims ### Claim 1 An antifogging film comprising: a film base which is formed of cellulose acylate; and a saponified layer which is provided on one base surface of the film base, serves as one film surface, and contains saponified cellulose acylate, wherein a contact angle 15 seconds after dropping of pure water to the one film surface is 20° or less, and in a case where an amount of acyl groups of the one film surface is X and an amount of acyl groups of the other base surface of the film base is Y, an acyl group ratio obtained by X/Y is 0.7 or less. ### Claim 2 (depends on 1) The antifogging film according to claim 1, wherein the amount of acyl groups X and the amount of acyl groups Y are obtained as acyl group spectrum intensities obtained by an attenuated total reflection measurement method of Fourier transform infrared spectroscopy. ### Claim 3 (depends on 1) The antifogging film according to claim 1, wherein the contact angle is obtained by dropping the pure water to the one film surface after adjusting humidity of the saponified layer in an atmosphere at a temperature in a range of 23° C. or higher and 28° C. or lower and a relative humidity in a range of 55% or more and 65% or less. ### Claim 4 (depends on 1) The antifogging film according to claim 1, wherein a mass of a plasticizer having a molecular weight of less than 500 in the film base is at most 4% with respect to a mass of cellulose acylate. ### Claim 5 (depends on 1) The antifogging film according to claim 1, wherein the film base includes an ester oligomer having a repeating unit including an ester bond of dicarboxylic acid and diol and having a molecular weight in a range of 500 or more and 10,000 or less, as a plasticizer. ### Claim 6 (depends on 5) The antifogging film according to claim 5, wherein the dicarboxylic acid is an aliphatic dicarboxylic acid having 2 to 10 carbon atoms, and the diol is an aliphatic diol having 2 to 10 carbon atoms. ### Claim 7 (depends on 1) The antifogging film according to claim 1, wherein a thickness of the saponified layer is in a range of 1 μm or more and 6 μm or less. ### Claim 8 (depends on 1) The antifogging film according to claim 1, wherein an amount of C═O groups of acyl groups in a depth range of 2 μm from the one film surface is 70% or less with respect to an amount of C═O groups of acyl groups in the other base surface of the film base. ### Claim 9 (depends on 1) The antifogging film according to claim 1, wherein the saponified layer is a layer formed by subjecting a cellulose acylate film to a saponification treatment, and the film base is a remaining portion of the cellulose acylate film excluding the saponified layer.