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

The present invention relates to cellulose esters having low hydroxyl content for use in optical applications, such as liquid crystal display (LCD) films. Films made with low hydroxyl levels and a given ratio of non-acetyl ester to hydroxyl level have been found to have low intrinsic birefringence. Therefore, these films can be cast, molded, or otherwise oriented without an appreciable birefringence or optical distortion (i.e. retardation). Such features make these films useful in polarizer, protective, and compensator films as well as molded optical parts, such as lenses. Furthermore, it has also been found that resins of the present invention can also be made to have “+C plate” behavior either by melt or solvent based processing, a characteristic which is not typical of cellulose esters. Such +C behavior allows films to be produced having unique compensatory behavior. Other embodiments of the invention relate to methods melt casting films while minimizing birefringence formation. Another embodiment of the invention is directed to films made from the cellulose esters described herein further comprising a plasticizer.

Cellulose ester compositions having low birefringence and films made therefrom comprising a plasticizer

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

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

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 obtain a cellulose ester film having excellent dimensional stability and physical properties of strength free from precipitation of plasticizer by incorporating a specific compound into a phosphric ester-based plasticizer- containing cellulose ester film. CONSTITUTION:A dope containing 3-50wt.% based on plasticizer of a compound shown by the formula (n is 3-6, preferably 3 or 4; R is alkyl or alkenyl which may contain substituent group, preferably >=4C; benzene ring may contain substituent group except COOR) obtained by esterifying (A) a cellulose ester (e.g. cellulose acetate) with (D) a carboxylic acid (anhydride) in the presence of (B) a solvent (preferably a mixture of methylene chloride and another solvent), (C) a phosphoric ester-based plasticizer (preferably triphenyl phosphate) and an alcohol is cast on a substrate and then the solvent is evaporated to give a cellulose ester film having excellent dimensional stability and physical properties of strength.

Cellulose ester film and production thereof

PURPOSE:To obtain a cellulose ester film improved in flame retardancy, dimensional stability, volatilization resistance, migration resistance and mechanical strengths by casting a dope comprising a cellulose ester, a specified plasticizer and a solvent on a support to form a film. CONSTITUTION:A plasticizer comprising a compound of the formula (wherein R1, R2, R4 and R5 are each a hydrocarbyl such as alkyl or aryl; R3 is alkylene; and (n) is 1-10) is optionally mixed with another plasticizer such as triphenyl phosphate or biphenyl diphenyl phosphate to obtain a plasticizer component (B). 18-35wt.% mixture of a cellulose ester (A) with 5-20wt.%, based on component A, component B is dissolved in a solvent containing 75-87wt.% methylene chloride to obtain a dope. This dope is cast on a support at a surface temperature of 10 deg.C or below to form the title film of a thickness of 10-500mum.

Cellulose ester film and its production

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

Nishiura Yosuke

Papers

Prevention of deterioration of cellulose acetate film

Retardation rise agent for film of cellulose lower fatty acid ester

Cellulose ester film and production thereof

Cellulose ester film and its production

Va mode liquid crystal display device