Abstract: A polymer film that has an in-plane retardation Re(?) and a thickness-direction retardation Rth(?) satisfying formula (i) and (ii), and that further has a surface energy of at least one surface is from 50 mN/m to 80 mN/m: 0?Re(630)?10, and |Rth(630)|?25;??(i) and |Re(400)?Re(700)|?10, and |Rth(400)?Rth(700)|?35.??(ii) in the formulae, Re(?) and Rth(?) are measurement values at the wavelength of ? nm, and an optically-compensatory film, an optical material such as a polarizer and a liquid-crystal display device using the polymer film.

Abstract: A polymer film that has an in-plane retardation Re(?) and a thickness-direction retardation Rth(?) satisfying formula (i) and (ii), and that further has a surface energy of at least one surface is from 50 mN/m to 80 mN/m: 0?Re(630)?10, and |Rth(630)|?25; and??(i) |Re(400)?Re(700)|?10, and |Rth(400)?Rth(700)|?35.??(ii) in the formulae, Re(?) and Rth(?) are measurement values at the wavelength of ? nm, and an optically-compensatory film, an optical material such as a polarizer and a liquid-crystal display device using the polymer film.

Abstract: A cellulose acylate film containing a cellulose acylate, that has an aromatic group-containing acyl group and satisfies the formulae (I) and (II): 0.9?DSA?2.0??(I) 0.9?DS?2.0??(II) wherein DSA is a degree of substitution with the aromatic group-containing acyl group and DS is a total degree of substitution.

Abstract: A polymer film that has an in-plane retardation Re(?) and a thickness-direction retardation Rth(?) satisfying formula (i) and (ii), and that further has a surface energy of at least one surface is from 50 mN/m to 80 mN/m: 0?Re(630)?10, and |Rth(630)|?25;??(i) and |Re(400)?Re(700)|?10, and |Rth(400)?Rth(700)|?35.??(ii) in the formulae, Re(?) and Rth(?) are measurement values at the wavelength of ? nm, and an optically-compensatory film, an optical material such as a polarizer and a liquid-crystal display device using the polymer film.

Abstract: A cellulose acylate film includes a cellulose acylate; and a polyester diol having a hydroxyl group at each of the both terminals in an amount of 5 mass % or more based on the amount of the cellulose acylate.

Abstract: Provided is a cellulose ester film including a polycondensed ester which is obtained from a mixture containing an aromatic dicarboxylic acid, an aliphatic dicarboxylic acid, an aliphatic diol having an average carbon atom number of from 2.0 to 3.0 and a monocarboxylic acid, and both terminals of which are a monocarboxylic acid ester derivative.

Abstract: A cellulose-film modifier, having a compound represented by the following Formula (1): wherein R1 represents a hydrogen atom or an aliphatic or aromatic acyl group; R2, R3 and R4 each represent a hydrogen atom or an aliphatic or aromatic group; and at least one of R2, R3 and R4 represents an aliphatic group bonding via its secondary carbon; a cellulose composition, an optical cellulose film, a polarizing plate-protecting film, a polarizing plate, and a liquid crystal display device.

Abstract: A polymer film comprising at least one polymer as the main ingredient thereof, and at least one compound that satisfies relational formulae (1) and (2), in an amount of from 0.2 to 20% by mass of said at least polymer is disclosed. ?max indicates the maximum absorption wavelength (unit: nm) of the compound, ?1/2 (?max<?1/2) indicates the wavelength at which the absorption intensity at ?max is ½.

Abstract: An optical compensation sheet, which contains a cellulose acylate film that contains 1 to 20 parts by mass of a retardation controlling agent, to 100 parts by mass of a cellulose acylate, wherein the retardation controlling agent comprises at least two compounds different in Re/Rth ratios each other; and a liquid crystal display device, which contains the optical compensation sheet.

Abstract: A method for producing a cellulose acylate film, comprising casting a polymer solution that comprises a plasticizer having a number-average molecular weight of 200-10000 and a cellulose acylate to form a web; stretching the web having a residual solvent amount of 100-300% by mass in one direction at from ?30° C. to 30° C.; drying the stretched web to reduce the residual solvent amount from 6-120% by mass to less than 12% by mass while controlling the surface temperature of the web so as not to reach 200° C. or higher; and stretching the resulting film at 60-200° C. in a direction different form the stretching direction of the first stretching.

Abstract: Provided is a cellulose ester film including a polycondensed ester which is obtained from a mixture containing an aromatic dicarboxylic acid, an aliphatic dicarboxylic acid, an aliphatic diol having an average carbon atom number of from 2.0 to 3.0 and a monocarboxylic acid, and both terminals of which are a monocarboxylic acid ester derivative.

Abstract: Cellulose acylate grains having a heat quantity of crystalline fusion of at most 10 J/g. A film prepared by melt-casting the grains is free from the problem of yellowing when built in liquid-crystal display devices.

Abstract: An optical film includes a cellulose acylate that has a weight-average molecular weight of 300,000 or more; and a compound that is capable of decreasing a retardation in a thickness-direction and has a weight-average molecular weight of 1,000 or more.

Abstract: A cellulose-film modifier, having a compound represented by the following Formula (1): wherein R1 represents a hydrogen atom or an aliphatic or aromatic acyl group; R2, R3 and R4 each represent a hydrogen atom or an aliphatic or aromatic group; and at least one of R2, R3 and R4 represents an aliphatic group bonding via its secondary carbon; a cellulose composition, an optical cellulose film, a polarizing plate-protecting film, a polarizing plate, and a liquid crystal display device.

Abstract: A polymer film that has an in-plane retardation Re(?) and a thickness-direction retardation Rth(?) satisfying formula (i) and (ii), and that further has a surface energy of at least one surface is from 50 mN/m to 80 mN/m: (i) 0?Re(630)?10, and |Rth(630)|?25; and (ii) |Re(400)?Re(700)?10, and |Rth(400)?Rth(700)|?35. in the formulae, Re(?) and Rth(?) are measurement values at the wavelength of ? nm, and an optically-compensatory film, an optical material such as a polarizer and a liquid-crystal display device using the polymer film.

Abstract: An optical compensation sheet is provided and includes: a cellulose acylate film having optical anisotropy and meeting all of requirements represented by the following expressions (1) to (3); and an optically anisotropic layer having a slow axis orthogonal to a slow axis of the cellulose acylate film. 2.6?X+Y<3.0??Expression (1) 0?X?1.8??Expression (2) 1.0?Y<3.0??Expression (3) X represents a substitution degree of acetyl group and Y represents a total sum of substitution degrees of propionyl, butanoyl, pentanoyl and hexanoyl groups.

Abstract: An optical compensation sheet, which contains a cellulose acylate film that contains 1 to 20 parts by mass of a retardation controlling agent, to 100 parts by mass of a cellulose acylate, wherein the retardation controlling agent comprises at least two compounds different in Re/Rth ratios each other; and a liquid crystal display device, which contains the optical compensation sheet.

Abstract: An optical film includes a cellulose acylate, a polymer additive that decreases an optical anisotropy of the cellulose acylate, a compound that has a plasticizing effect, and a compound that changes a wavelength dispersion of an optical property of the cellulose acylate.

Abstract: A cellulose acylate film includes a cellulose acylate, a polymer obtained by polymerizing an ethylenically unsaturated monomer and an unreacted ethylenically unsaturated monomer in an amount of 1 mass % or less based on the cellulose acylate film.

Abstract: The present invention relates to a cellulose acylate film having a high modulus of elasticity and a high surface hardness. The cellulose acylate film of the present invention is characterized by containing 1 vol % to 99 vol % of a metal oxide having an average particle size of 1 nm to 400 nm. The metal oxide used here is preferably a metal oxide having a Mohs hardness of at least 7, and specific examples thereof include aluminum oxide and silicon dioxide. This metal oxide may be subjected to a surface treatment. Furthermore, a functional thin film such as a hardcoat layer may be formed on the cellulose acylate film containing the metal oxide.