# US 10,871,597 B2 · Polarizing plate, image display device, and polarizing plate protective film > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,871,597 B2 - Document ID: US10871597B2 - Status: Granted - Kind: B2 - Application number: 16/038,639 - Filed: 2018-07-18 - Published: 2018-11-15 - Granted: 2020-12-22 - Earliest claimed: 2016-01-22 - Assignees: FUJIFILM Corporation - Applicants: FUJIFILM Corporation - Inventors: Naoki Sano; Nobutaka Fukagawa; Akio Tamura - Web page: https://patentgrep.com/patent/US10871597B2 ## CPC - G02B 1/14: Protective coatings, e.g. hard coatings - B32B 23/14: characterised by containing special compounding ingredients - C08B 3/06: Cellulose acetate {, e.g. mono-acetate, di-acetate or tri-acetate} - C08J 5/18: Manufacture of films or sheets - C08K 5/29: Compounds containing {one or more} carbon-to-nitrogen double bonds - C08K 5/3462: Six-membered rings - C08L 1/10: Esters of organic acids {, i.e. acylates} - G02B 5/30: Polarising elements (light-modulating devices with active elements G02F1/00) - G02B 5/3033: {in the form of a thin sheet or foil, e.g. Polaroid} - C08J 2301/12: Cellulose acetate - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - 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) - 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) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract Provided are a polarizing plate including a polarizer and a polarizing plate protective film laminated on the polarizer, in which the polarizing plate protective film contains at least one compound represented by any one of General Formulas (1) to (3) and cellulose acylate; an image display device using the polarizing plate; and a polarizing plate protective film used for the polarizing plate, and R7—N═C═N—R8 General Formula (3) in which R1 to R8 represent a specific substituent. ## Claims ### Claim 1 A polarizing plate comprising: a polarizer; and a polarizing plate protective film laminated on the polarizer, wherein the polarizing plate protective film contains at least one compound represented by any one of General Formulas (1) to (3), and cellulose acylate, in General Formula (1), R1 and R2 represent an alkyl group, a cycloalkyl group, an aryl group, an acyl group, an alkoxy group, an aryl carbonyl group, or a carbamoyl group, and R3 represents an alkyl group, a cycloalkyl group, or an aryl group, in General Formula (2), R4 and R5 represent an alkyl group, a cycloalkyl group, an aryl group, an acyl group, an alkoxy group, an aryl carbonyl group, or a carbamoyl group, and R6 represents an alkyl group, a cycloalkyl group, or an aryl group, and R7—N═C═N—R8 General Formula (3) in General Formula (3), R7 and R8 represent an alkyl group, a cycloalkyl group, or an aryl group, provided that in each of General Formulas (1) to (3), a carbon atom and a nitrogen atom which are shown to be linked to each other by a double bond are not ring-constituting atoms of a monocyclic ring. ### Claim 2 (depends on 1) The polarizing plate according to claim 1, wherein in the polarizing plate protective film, a content of the compound represented by any one of General Formulas (1) to (3) is a total of 0.1 to 50 parts by mass with respect to 100 parts by mass of a content of the cellulose acylate. ### Claim 3 (depends on 1) The polarizing plate according to claim 1, wherein at least one of R1, R2, or R3 of General Formula (1) is an aryl group, at least one of R4, R5, or R6 of General Formula (2) is an aryl group, and at least one of R7 or R8 of General Formula (3) is an aryl group. ### Claim 4 (depends on 3) The polarizing plate according to claim 3, wherein at least two of R1, R2, or R3 of General Formula (1) are aryl groups, at least two of R4, R5, or R6 of General Formula (2) are aryl groups, and R7 and R8 of General Formula (3) are aryl groups. ### Claim 5 (depends on 3) The polarizing plate according to claim 3, wherein the aryl group is a phenyl group. ### Claim 6 (depends on 1) The polarizing plate according to claim 1, wherein the compound represented by any one of General Formulas (1) to (3) has a molecular weight of 250 or more. ### Claim 7 (depends on 1) The polarizing plate according to claim 1, wherein the polarizing plate protective film contains at least one compound represented by General Formula (A), in General Formula (A), RA1 and RA3 represent a hydrogen atom, an alkyl group, a cycloalkyl group, an alkenyl group, or an aromatic group, and RA5 represents a hydrogen atom or a substituent. ### Claim 8 (depends on 1) The polarizing plate according to claim 1, wherein the polarizing plate protective film contains at least one compound represented by General Formula (I) or (II), (Xn1—Z—R1a)m1 General Formula (I) in General Formula (I), Z represents a benzene ring or a cyclohexane ring, X represents a group represented by General Formula (I-A-3), n1 is an integer of 2 to 6, Rla represents a substituent, and m1 is an integer of 0 to 4, in General Formula (I-A-3), RC7 to RC12 represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, an acyl group, an aryl carbonyl group, an alkoxy group, or an alkoxycarbonyl group, and * represents a bond, and in General Formula (II), X has the same meaning as X in General Formula (I), n21 and n22 are integers of 1 to 5, R21 and R22 represent substituents, and m21 and m22 are integers of 0 to 4. ### Claim 9 (depends on 1) An image display device comprising: the polarizing plate according to claim 1. ### Claim 10 A polarizing plate protective film comprising: at least one compound represented by any one of General Formulas (1) to (3); and cellulose acylate, in General Formula (1), R1 and R2 represent an alkyl group, a cycloalkyl group, an aryl group, an acyl group, an alkoxy group, an aryl carbonyl group, or a carbamoyl group, and R3 represents an alkyl group, a cycloalkyl group, or an aryl group, in General Formula (2), R4 and R5 represent an alkyl group, a cycloalkyl group, an aryl group, an acyl group, an alkoxy group, an aryl carbonyl group, or a carbamoyl group, and R6 represents an alkyl group, a cycloalkyl group, or an aryl group, and R7—N═C═N—R8 General Formula (3) in General Formula (3), R7 and R8 represent an alkyl group, a cycloalkyl group, or an aryl group, provided that in each of General Formulas (1) to (3), a carbon atom and a nitrogen atom which are shown to be linked to each other by a double bond are not ring-constituting atoms of a monocyclic ring.