PROBLEM TO BE SOLVED: To provide an optical film obtained by a melt casting method using the raw material polymer of cellulose ester without using a halogen-containing solvent imposing a high environmental load, hardly discolored, minimized in dispersion in retardation and hardly generating blurring failure, and to provide a polarizing plate and a liquid crystal display device using the film SOLUTION: In this optical film of 20 to 200 μm in film thickness manufactured by the melt casting method from a raw material obtained by mixing at least the cellulose ester and a plasticizer, a single screw extruder or a multi-screw extruder and a T die are used for extrusion film forming, the residence time to the discharge out of the T die in a film of the raw material from its loading into the single screw extruder or the multi-screw extruder is ≤5 minutes, and the breakdown index of the optical film obtained is ≤06% COPYRIGHT: (C)2006,JPO&NCIPI

Optical film, polarizing plate, and liquid crystal display device

Provided is a transparent support including a light-transmitting particle having an average particle diameter of 6 to 20 μm, wherein the transparent support has a thickness of from 20 to 200 μm, the light-transmitting particle is contained in a ratio of 0.5 to 20 mass % based on entire solid content in the transparent support, and the transparent support has an arithmetic average roughness (Ra) of 0.05 μm or less.

Transparent support, optical film, polarizing plate and image display device

PROBLEM TO BE SOLVED: To provide an optical film which has high retardation developing properties and is excellent in bleed-out resistance and further, to provide a polarizing plate and a liquid crystal display device having high durability using the optical film.SOLUTION: There is provided an optical film containing a cellulose ester and a compound represented by the following general formula (1). (Where, Rand Rrepresents a hydrogen atom or a substituent, Rand Rrepresent a hydrogen atom or a substituent having a negative Hammett substituent constant σp, Land Lrepresents a divalent linking group, A represents an aromatic group having a valence of 1 to 9 or a heteroaromatic group having a valence of 1 to 9, m represents an integer of 0 to 8, n represents an integer of 0 to 8, and r represents an integer of 1 to 4.)

Optical film, and polarizing plate and liquid crystal display device using the same

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.

Cellulose ester film, retardation film, polarizing plate and liquid crystal display device

A method for producing an optical film comprising leading a melt of a composition containing a thermoplastic resin to pass between a first nip-pressing surface and a second nip-pressing surface of a nip-pressing unit whereby the melt is continuously nippressed therebetween to form a film, wherein the nip-pressing unit applies a pressure of from 20 to 500 MPa to the melt, and the first nip-pressing surface moves at a higher speed than the second nip-pressing surface.

Method for producing optical film, optical film, polarizer, optical compensatory film, antireflection film and liquid crystal display device

PURPOSE:To prevent a cellulose acetate film used for, eg a silver halide photographic material or a protective film for a polarizing plate from being deteriorated to keep its excellent storage stability even under wet heat conditions and difficult colorability CONSTITUTION:The title process comprises adding a basic compound of the general formula: (Ba)m-X wherein X is a single bond or a bi- or tri-valent organic residue, Ba is amino, aryl, aryloxy or a nitrogen-containing heterocyclic ring, and m is 2 or 3, and a peroxide decomposing agent to a cellulose acetate film or the adjoing layer of a cellulose acetate film prepared by forming an adjoining layer on a cellulose acetate film

Prevention of deterioration of cellulose acetate film

PURPOSE:To prevent the degradation of a cellulose acetate film used in a silver halide photosensitive material or for protecting a polarizing plate and thus provide the film excellent in storage stability even under wet-heat conditions. CONSTITUTION:A cellulose acetate film optionally having a covering layer is protected from degradation by incorporating an amine compd. having a pKa (a negative logarithm of acid dissociation constant) of at least 4 or a substantially nonvolatile amine compd. having a mol.wt. per basic group of 200 or lower into the film or the covering layer.

Method for preventing degradation of cellulose acetate film

PROBLEM TO BE SOLVED: To increase the Rth retardation value of the film of cellulose lower fatty acid ester SOLUTION: A compound that bears at least two aromatic rings and has a molecular structure causing no steric hindrance to the constellation of the two aromatic rings is used as a Rth retardation value rising agent for the film of cellulose lower fatty acid ester COPYRIGHT: (C)2006,JPO&NCIPI

Retardation rise agent for film of cellulose lower fatty acid ester

PURPOSE:To produce a cellulose ester film stable even under severe conditions by using triphenyl phosphate having an acidic impurity content lower than a specified value as the plasticizer of the film. CONSTITUTION:Triphenyl phosphate having an acidic impurity content lower than 0.50mol% (based on the phosphate) is used as the plasticizer for producing the film. The obtd. film is suitable for a carrier of a silver halide photographic material, a protective film of a polarizing plate, etc., hardly under goes any decrease in viscosity, i.e., a decrease in the degree of polymn., even under such severe conditions as in a tightly sealed metal case or at high temp. and humidity, and hence is excellent in weatherability, resistances to wet heat and dark wet heat, and storage stability.

Production of cellulose ester film

PROBLEM TO BE SOLVED: To provide a liquid crystal display device in which a cellulose ester film with an excellent property as a supporting body is used as an optical compensator sheet. SOLUTION: In the liquid crystal display device having the optical compensator sheets bonded to upper and lower sides of a VA mode liquid crystal cell, polarizing films disposed on upper and lower sides of the optical compensator sheets, and protective films disposed on upper and lower sides of the polarizing films, the optical compensator sheets are composed of a film of a lower aliphatic acid ester of cellulose having a protective function of the polarizing film, the film of the lower aliphatic acid ester of cellulose includes a compound having at least two aromatic rings of 0.3-20 pts.wt. based on the lower aliphatic acid ester of cellulose of 100 pts.wt., and a retardation value of the film of the lower aliphatic acid ester of cellulose in the thickness direction at a wavelength of 550 nm is 100-400 nm. COPYRIGHT: (C)2010,JPO&INPIT

Murayama Masahiko

Papers

Prevention of deterioration of cellulose acetate film

Method for preventing degradation of cellulose acetate film

Retardation rise agent for film of cellulose lower fatty acid ester

Production of cellulose ester film

Va mode liquid crystal display device