Abstract: The polymer film comprises a carbonyl bond-containing polymer and a compound having ?h of equal to or higher than 11.0 and ?? of equal to or lower than 1.50, wherein the ?h is a value of hydrogen-bonding capacity calculated by Hoy method and the ?? is a value calculated by equation 1: ??=|x?13.3|??Equation 1 wherein, in equation 1, ? represents an interatomic distance in the polymer film between atoms most distant from each other among molecules in the compound, excluding a hydrogen atom, calculated by molecular dynamics calculation.

Abstract: A polarizing plate, which includes at least a polarizer layer including an iodine-dyed polyvinyl alcohol film, and the polarizing plate including a compound with a bond dissociation energy E1 of less than or equal to 90.0 kcal/mol, a peroxide radical forming energy E2 of less than or equal to 0.0 kcal/mol, and a polyiodide ion I5? forming ability in an iodide compound-containing solution of less than or equal to 1.0.

Abstract: Provided is a polarizer durable against high-temperature and high-humidity conditions, small in changes in the single plate transmittance, and a liquid crystal display device. A polarizer including a polyvinyl alcohol-based resin, a dichroic colorant, and a compound, etc. represented by the formula (1) below, the content of the compound represented by the formula (1) being 0.01 to 30 parts by mass relative to 100 parts by mass of the polyvinyl alcohol-based resin. In the formula (1) , each of R1 and R3 independently represents a hydrogen atom, C1-20 straight-chain alkyl group, C3-20 branched alkyl group, C3-20 cycloalkyl group, C2-20 alkenyl group or C6-20 aromatic group, and R5 represents a substituent.

Abstract: A cellulose acylate film, which includes a compound denoted by general formula (I) below, the equivalent U of which, calculated as a value obtained by dividing the molecular weight of the compound by the number of divalent linking groups denoted by —O—C(?O)—NH— contained per molecule, is less than or equal to 515, wherein, in general formula (I), each of L11 and L21 independently denotes an optionally substituted alkylene group; each of L12 and L22 independently denotes a single bond, any one of or any combination of —O—, —NR1—, —S— and —C(?O)—; R1 denotes a hydrogen atom or a substituent; each of n1 and n2 independently denotes an integer of 0 to 20, with at least either n1 or n2 being an integer of greater than or equal to 1.

Abstract: A polarizer protective film having a cellulose acylate film containing a cellulose acylate and a hindered amine compound in an amount of at least 0.01% by mass relative to the cellulose acylate, and, as laminated on the cellulose acylate film, an active energy ray-curable layer, wherein the hindered amine compound has a piperidine skeleton represented by the following formula (1): wherein X represents an alkyl or aryl group; Y represents a hydrogen atom or a substituent; R1 to R4 represent an alkyl group.

Abstract: Provide is a cellulose acylate film, of which the environmental humidity-dependent retardation change is small and which, when stuck to a polarizer and used in high-temperature and high-humidity environments, is effective for preventing the polarizing element from being deteriorated. A cellulose acylate film, which contains a hydrogen-bonding compound satisfying the following requirements (A) to (C), and at least one hydrophobizing agent selected from a polyalcohol ester-base hydrophobizing agent, a polycondensate ester-base hydrophobizing agent and a carbohydrate derivative-base hydrophobizing agent: (A) the compound has both a hydrogen-bonding donor part and a hydrogen-bonding acceptor part in one molecule, (B) the value computed by dividing the molecular weight of the compound by the total number of the hydrogen-bonding donor number and the hydrogen-bonding acceptor number in the compound is from 30 to 65, and (C) the total number of the aromatic ring structures in the compound is from 1 to 3.

Abstract: A film containing a cellulose acylate, a hindered amine compound at least 0.001% by mass relative to the cellulose acylate, and a plasticizer, satisfying: (i) the concentration C1 of the hindered amine compound 3 ?m from the first film surface is higher than the concentration C2 3 ?m from the second film surface; (ii) the concentration A of the plasticizer 3 ?m from the first film surface is lower than the concentration B 10 ?m from the first film surface; (iiia) the 15 acyl substitution degree a of the cellulose acylate 3 ?m from the first film surface is lower than the acyl substitution degree b 10 ?m from the first film surface; and (iiib) the 20 weight-average molecular weight Ma of the cellulose acylate 3 ?m from the first film surface is higher than the weight-average molecular weight Mb 10 ?m from the first film surface.

Abstract: A polarizing plate includes at least: a polarizer layer containing a polyvinyl alcohol-based film dyed with iodine; and one or more other layers except for the polarizer layer, in which the polarizer layer contains a compound which has polyiodide ion I5? reduction capability in iodide compound- and iodine-containing solutions, and at least one of the one or more other layers contain a compound which has polyiodide ion I5? formation capability in an iodide compound-containing solution.

Abstract: An optical film, containing a cellulose acylate, and at least one compound represented by any of formulas (I) to (III): wherein, in formulas (I) to (III), R1 and R2 each independently represent a halogen atom, an alkyl, cycloalkyl, alkenyl, aryl, hydroxy, hydroxyamino, amino, alkylamino, arylamino, alkoxy, aryloxy, alkylthio, or arylthio group (however, R1 and R2 do not represent an amino, alkylamino, or arylamino group at the same time); R3 to R6 each independently represent a hydrogen atom, an alkyl, cycloalkyl, alkenyl, aryl, acyl, alkyl- or aryl-sulfonyl, alkyl- or aryl-sulfinyl, carbamoyl, sulfamoyl, alkoxycarbonyl, or aryloxycarbonyl group; R7 represents an alkyl, cycloalkyl, alkenyl, aryl, alkylamino, arylamino, alkoxy, aryloxy, or heterocyclic group; R8 represents an alkyl, cycloalkyl, alkenyl, aryl, or heterocyclic group; and R1 to R8 each may be further substituted with a substituent; and a polarizing plate and a liquid crystal display.

Abstract: A cellulose acylate film, containing: at least two or more of chelating agents having different pKa values from one another, wherein the chelating agents comprise: a chelating agent A having at least one functional group whose acid dissociation constant pKa, measured at 25° C. in a mixed solvent having a mixing ratio of tetrahydrofuran 60 ml/water 40 ml, is 6 or less; and a chelating agent B having at least one functional group of a conjugate acid whose pKa, measured at the same condition, is 7 or more; and a cellulose acylate, and wherein the number of bright spots of the cellulose acylate film is equal to or less than 500/cm2; a polarizing plate protective film, a polarizing plate and a liquid crystal display using the same.

Abstract: A polarizing plate includes two protective films and a polarizer provided between the two protective films, and the polarizer has a thickness of 3 ?m to 18 ?m, at least one of the protective films has a thickness of 3 ?m to 40 ?m and contains at least one resin and a compound in an amount of 1 part by mass to 20 parts by mass based on 100 parts by mass of the resin, the compound having at least one hydrogen-donating group capable of forming a hydrogen bond and a ratio of molecular weight to number of aromatic rings of 300 or less, and the polarizing plate has a thickness of 15 ?m to 70 ?m.

Abstract: A protective film to a polarizer including a cellulose acylate and satisfying the following requirement (1) or (2): (1): The surface of the film has a pH of from 3.0 to 4.5. (2): The surface of the film has a pH of more than 4.5 and at most 6.0, and the film has a moisture permeability of at least 2800 g/m2·day.

Abstract: An optical film, has a film thickness of 15 ?m to 45 ?m, Rth (440 W, 30% RH) and “Rth (440 W, 30% RH)?Rth (440 W, 80% RH)” of the optical film satisfy Expression (1) ?20 nm?Rth (440 W, 30% RH)?5 nm and Expression (2) 0 nm?Rth (440 W, 30% RH)?RH (440 W, 80% RH)?18 nm, here, in Expressions (1) and (2), Rth (440 W, 30% RH) represents a retardation value in a film thickness direction at a wavelength of 440 nm measured at 25° C. and at a relative humidity of 30% and Rth (440 W, 80% RH) represents a retardation value in the film thickness direction at a wavelength of 440 nm measured at 25° C. and at a relative humidity of 80%; a polarizer and liquid crystal display device.

Abstract: A cellulose acylate film containing a cellulose acylate and a sugar ester compound having from 1 to 12 pyranose structures or furanose structures in which at least one hydroxyl group is esterified, the film satisfying 40 nm?Re(550)?60 nm and 100 nm?Rth(550)?140 nm, and having a dimensional change of ?0.5 to 0.5% and an internal haze of at most 0.1%.

Abstract: There is provided a cellulose acylate film, containing a hindered amin-based compound, wherein the hindered amine-based compound is contained in an amount of 0.001% by mass to 5% by mass based on cellulose acylate, a minimum value of Knoop hardness is 170 N/mm2 to 220 N/mm2, and the Knoop hardness is measured several times by a Knoop indenter, the Knoop indenter is rotated by a given angle in each measurement, and a rotation axis of the Knoop indenter is orthogonal to an upper surface of the cellulose acylate film.

Abstract: Provided is a polymer film containing at least one of a compound represented by formula (1) of hydrates, solvates, or salts thereof. Y is a methine group or nitrogen atom. Qa, Qb, and Qc are a single bond or a divalent linking group. Ra, Rb, and Rc, are hydrogen atom, alkyl group, alkenyl group, alkynyl group, aryl group, cyano group, halogen group, or heterocyclic group. X2 is a single bond or a divalent linking group. X1 is a single bond or a predetermined divalent linking group.

Abstract: Provide is a cellulose acylate film, of which the environmental humidity-dependent retardation change is small and which, when stuck to a polarizer and used in high-temperature and high-humidity environments, is effective for preventing the polarizing element from being deteriorated. A cellulose acylate film, which contains a hydrogen-bonding compound satisfying the following requirements (A) to (C), and at least one hydrophobizing agent selected from a polyalcohol ester-base hydrophobizing agent, a polycondensate ester-base hydrophobizing agent and a carbohydrate derivative-base hydrophobizing agent: (A) the compound has both a hydrogen-bonding donor part and a hydrogen-bonding acceptor part in one molecule, (B) the value computed by dividing the molecular weight of the compound by the total number of the hydrogen-bonding donor number and the hydrogen-bonding acceptor number in the compound is from 30 to 65, and (C) the total number of the aromatic ring structures in the compound is from 1 to 3.

Abstract: Provide is a cellulose acylate film, of which the environmental humidity-dependent retardation change is small and which, when stuck to a polarizer and used in high-temperature and high-humidity environments, is effective for preventing the polarizing element from being deteriorated. A cellulose acylate film, which contains a hydrogen-bonding compound satisfying the following requirements (A) to (C), and at least one hydrophobizing agent selected from a polyalcohol ester-base hydrophobizing agent, a polycondensate ester-base hydrophobizing agent and a carbohydrate derivative-base hydrophobizing agent: (A) the compound has both a hydrogen-bonding donor part and a hydrogen-bonding acceptor part in one molecule, (B) the value computed by dividing the molecular weight of the compound by the total number of the hydrogen-bonding donor number and the hydrogen-bonding acceptor number in the compound is from 30 to 65, and (C) the total number of the aromatic ring structures in the compound is from 1 to 3.

Abstract: Provided is a polymer film containing at least one of a compound represented by formula (1) of hydrates, solvates, or salts thereof. Y is a methine group or nitrogen atom. Qa, Qb, and Qc are a single bond or a divalent linking group. Ra, Rb, and Rc, are hydrogen atom, alkyl group, alkenyl group, alkynyl group, aryl group, cyano group, halogen group, or heterocyclic group. X2 is a single bond or a divalent linking group. X1 is a single bond or a predetermined divalent linking group. R1 and R2 are a hydrogen atom, alkyl group, alkenyl group, alkynyl group, aryl group, or heterocyclic group.

Abstract: A protective film of polarizer comprising an organic acid that has a solubility in water at 25° C. of at most 0.1% by mass and has an acid dissociation constant in a mixed solvent of tetrahydrofuran/water=6/4 by volume at 25° C. of from 2 to 7 can improve polarizer durability.