Konica Minolta Opto, Inc.

Konica Minolta, Inc.

Konical Minolta Advanced Layers, Inc.

Shigeki Oka

Kunio Shimizu

Takashi Takebe

Koji Tasaka

Ayako Inagaki

Takashi Murakami

Shigeto Ohmori

Hirokazu Sato

Akira Sato

Masaru Iwagaki

Nobuo Kubo

Noriki Tachibana

Takahiro Takagi

Kazuhiro Miyazawa

Hirokazu Koyama

Yuki Kaneko

Takashi Sera

Kentaro Yano

A polarizing plate protective film forming a polarizing plate by sandwiching a polarizer with two of the polarizing plate protective films, wherein at least one of the two polarizing plate protective films exhibits Ro defined by Expression (I) of 0 to 10 mm and Rt defined by Expression (II) of &#x2212;20 to 20 mm, and also at least one of the polarizing plate protective films has a hard coat layer: Expression (I): Ro=(nx&#x2212;ny)&#xd7;d; Expression (II): Rt={(nx+ny)/2&#x2212;nz}&#xd7;d; wherein nx is a refractive index in a delayed phase axis direction in a plane of the polarizing plate protective film, ny is a refractive index in a direction at right angles to the delayed phase axis in the plane, nz is a refractive index in a film thickness direction, and d is a film thickness (nm).

Polarizing plate protective film, polarizing plate, and liquid crystal display

A vertical alignment mode liquid crystal display comprising: a liquid crystal cell; a first polarizer; a second polarizer; a first optical film arranged between the first polarizer and the liquid crystal cell; and a second optical film arranged between the liquid crystal cell and the second optical film, wherein the first and the second optical films each are a resin film having an optically biaxial property, the first and the second optical films meet: Formula (1) Ro&#x3e;Ro; Formula (2) Rth&#x3c;Rth; Formula (3) DSP&#x3c;DSP; and Formula (4) DSP&#x3c;DSP, wherein Roand Rorepresent in-plane retardation values of the first and the second optical films, respectively, Rthand Rthrepresent retardation values in the thickness direction of the first and the second optical films, respectively, and DSP, DSP, DSPand DSPrepresent wavelength dispersion properties of Ro, Ro; Rthand Rth, respectively.

Vertical alignment mode liquid crystal display

The purpose of the present invention is to provide: a retardation film which uses a low-substituted cellulose ester and has improved retardation after saponification and improved wet heat stability of internal haze; a polarizing plate which uses the retardation film; and a liquid crystal display device. An optical film of the present invention contains a cellulose ester and a compound represented by general formula (1), and is characterized in that the compound has an average degree of substitution within the range of 3.0-6.0 and contains a component having a degree of substitution of 4 or less in an amount of 30-80% by mass (inclusive). (In the formula, R-Reach represents a substituted or unsubstituted alkylcarbonyl group or a substituted or unsubstituted allylcarbonyl group, and R-Rmay be the same as or different from one another.) 

Retardation film, polarizing plate using same, and liquid crystal display device

A cellulose ester film containing a polyester represented by Formula (1) or (2), wherein an in-plane retardation value (Ro) is 0 to 5 nm and a retardation value in a thickness direction (Rt) is &#x2212;20 to 10 nm, Ro and Rt being measured at 23&#xb0; C. and 55% RH:B-(G-A-)G-B&#x2003;&#x2003;Formula (1)

Cellulose ester film, polarizing plate for in-plane-switching mode display and in-plane-switching mode display using the cellulose ester film

A polarizer protective film containing a cellulose acylate having a total acyl substitution degree of from 2.2 to less than 2.5 and a polymer prepared by polymerizing an acrylate ester or a methacrylate ester.

Polarizer protective film, polarizing plate and VA mode liquid crystal display

Disclosed is a polarizing plate protective film having high dimensional stability against moisture. Also disclosed are a polarizing plate using such a polarizing plate protective film, and a liquid crystal display. Specifically disclosed is a polarizing plate protective film which is characterized by containing a cellulose ester and a polymer X which is obtained by copolymerizing at least a styrene derivative monomer Xa having no hydroxyl group and an ethylenically unsaturated monomer Xb having a hydroxyl group or a carboxyl group, and has a weight average molecular weight of 500-100,000.

A manufacturing method of an optical film provided with a convexoconcave structure, comprises the steps of: coating a resin solution including a first resin solved by a solvent onto an endless or roll-like mold provided with a convexoconcave structure, and forming a resin solution layer on the mold; laminating a film substrate onto the resin solution layer to make a laminated film before the solvent in the resin solution layer is completely dried, the film substrate including a second resin, which is capable of absorbing the solvent or is soluble by the solvent; and peeling the laminated film from the mold before the solvent in the laminated film is completely dried.

Method for manufacturing an optical film having a convexoconcave structure

An object of the present invention is to provide a polarizing plate protective film exhibiting a reduced variation value retardation, which is highly stable against polarizing plate degradation, polarizing plate dimension, and polarizing plate curl. Disclosed is a cellulose ester film possessing cellulose ester, polymer X having a weight average molecular weight of 2000-30000 prepared by copolymerizing ethylenic unsaturated monomer Xa containing no aromatic ring and hydrophilic group within a molecule and ethylenic unsaturated monomer Xb containing no aromatic ring but a hydrophilic group within a molecule, and polymer Y having a weight average molecular weight of 500-3000 prepared by polymerizing ethylenic unsaturated monomer Ya containing no aromatic ring.

Cellulose ester film, polarizing plate and liquid crystal display

An IPS (In Plane Switching) mode type liquid crystal display apparatus having polarizing plates on both sides of a liquid crystal cell, wherein the polarizing plate protective film used between a liquid crystal cell and polarizer on a backlight light-source side is a cellulose ester film having a thickness of 20-50 &#x3bc;m and a retardation value of 0 nm&#x2266;Ro&#x2266;2 nm and &#x2212;5 nm&#x2266;Rt&#x2266;5 nm, and this cellulose ester film is characterized by temperature variation &#x394;Rt(t) lying in the range 0 nm&#x2266;&#x394;Rt(t)&#x2266;7 nm and humidity variation &#x394;Rt(h) lying in the range 0 nm&#x2266;&#x394;Rt(h)&#x2266;20 nm.

Liquid crystal display apparatus

A polarizing plate includes two transparent supports A and B; and a polarizer sandwiched between the two transparent supports A and B; wherein (i) the transparent support A is a stretched cellulose ester film (a) which contains a non-phosphoric acid ester plasticizer and substantially does not contain a phosphoric acid ester plasticizer, and wherein (ii) the transparent support B is a stretched cellulose ester film (b) which has a retardation value Rof from 0 nm to 10 nm and a retardation value Rof from &#x2212;30 nm to 20 nm, and the retardation value Rand the retardation value Rare defined by the following formulas (I) and (II):=()&#xd7;&#x2003;&#x2003;Formula (I):={()/2&#x2212;&#x2003;&#x2003;Formula (II):

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Tokyo, Japan

Shigeki Oka