Nitto-denko Corporation

Hiroe Maeda

Shuuji Yano

Akihiro Nishida

Takezou Hatanaka

Takashi Kondou

Takuya Matsunaga

Takayuki Shigematsu

Yuuji Saiki

Hirotaka Matsuura

A polarizing plate of the present invention comprising a polarizer and a protective film provided on at least one surface thereof with an adhesive layer, wherein the protective film comprises (A) a thermoplastic resin having a substituted and/or non-substituted imide group in a side chain and (B) a thermoplastic resin having a substituted and/or non-substituted phenyl group, and nitrile group in a side chain, and the adhesive layer comprises a polyurethane adhesive containing a urethane polyol and an isocyanate crosslinking agent. The polarizing plate exhibits good resistance moisture.

Polarizing plate, adhesive for polarizing plate, optical film and image display device

A light-diffusing sheet includes a transparent film and a light-diffusing layer formed on at least one side of the transparent film. The transparent film contains a thermoplastic resin having a substituted and/or non-substituted imido group in a side chain, and a thermoplastic resin having a substituted and/or non-substituted phenyl group and nitrile group in a side chain, and the surface with the minute unevenness has an average height-depth spacing (Sm): Sm&#x2266;80 &#x3bc;m, a center-line average surface roughness (Ra): Ra&#x2266;0.25 &#x3bc;m and a ten-point average surface roughness (Rz): Rz&#x2266;9Ra.

Light-diffusing sheet, optical element and image display

A light-diffusing sheet includes a transparent film and a light-diffusing layer formed on at least one side of the transparent film. The light-diffusing layer is composed of a resin coating layer having a rough surface. The transparent film contains a thermoplastic resin having a substituted and/or unsubstituted imide group at a side chain and a thermoplastic resin having a substituted and/or unsubstituted phenyl group and a nitrile group at a side chain.

Light-diffusing sheet, optical element and image viewing display

A light diffusing sheet of a structure in which a light diffusing layer is formed on at least one surface of a transparent film, the light diffusing layer including a resin coat layer having a minute unevenness shape and a low refractive index layer having a refractive index lower than that of the resin coat layer on the surface having a minute unevenness shape thereof, whereby the sheet can retain antiglare property, shows almost no white blurring to be recognized due to surface scattering, exhibits almost no birefringence, and is excellent in adherence and durability even when applied to a high definition LCD.

Light diffusing sheet, optical element and image display unit

An optical film in which a retardation film is laminated on one side of a polarizing plate, in which a transparent protective film is laminated on both sides of a polarizer, so that an absorbing axis of the polarizing plate and a slow axis of the retardation film may be perpendicular or may be parallel to each other, wherein a value Nz represented by Nz=(nx&#x2212;nz)/(nx&#x2212;ny) satisfies a range of 0.4 through 0.6, and an in-plane retardation Re=(nx&#x2212;ny)&#xd7;dis 200 through 350 nm, where, a direction of the retardation film in which an in-plane refractive index within the film surface concerned gives a maximum is defined as X-axis, a direction perpendicular to X axis is defined as Y-axis, a thickness direction of the film is defined as Z-axis, refractive indexes in axial direction are defined as nx, ny, nz, respectively, and a thickness of the film is defined as d(nm), and the transparent protective films comprise a thermoplastic saturated norbornene resin, may realize an easily viewable display with high contrast ratio in a wide range when applied to a display system and that may provide a retardation value stabilized under conditions of high temperature or high humidity.

Optical film and display system

An optical film in which a polarizing plate and a retardation film are laminated so that an absorbing axis of the polarizing plate and a slow axis of the retardation film may be perpendicular or may be parallel to each other, wherein a value Nz represented by Nz=(nx&#x2212;nz)/(nx&#x2212;ny) satisfies a range of 0.4 through 0.6, and an in-plane retardation Re=(nx&#x2212;ny)&#xd7;dis 200 through 350 nm, where, a direction of the retardation film in which an in-plane refractive index within the film surface concerned gives a maximum is defined as X-axis, a direction perpendicular to X axis is defined as Y-axis, a thickness direction of the film is defined as Z-axis, refractive indexes in axial direction are defined as nx, ny, nz, respectively, and a thickness of the film is defined as d(nm), may realize an easily viewable display with high contrast ratio in a wide range when applied to a display system, preferably used for a liquid crystal display operating in IPS mode.

A polarizing plate comprising a polarizer and a transparent protective film at least one surface of the polarizer via an adhesive layer, wherein an applied layer comprising a polymer having a hydroxyl group is formed on a surface of the transparent protective film that is adhered to the polarizer, and the adhesive layer is formed by an adhesive comprising an isocyanate adhesive, has no problem concerning saponification processing and has a good adhesive property between a polarizer and a transparent protective film.

Optical element, polarizing plate and method for manufacturing thereof, protective film for optical element, optical film using optical element, and visual display

An iodine-PVA polarizing element 30 &#x3bc;m thick is dried by heating at 50&#xb0; C. for 30 minutes to thereby obtain a polarizing element having a moisture content of 4.9% by weight. A pair of 100 &#x3bc;m-thick norbornene resin films (tradename 'ARTON' made by JSR Corporation) used as protective films are stuck to opposite surfaces of the obtained polarizing element through layers of PVA adhesive agents which are applied on the pair of nonbornene resin films respectively and dried, to form, a polarizer.

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Toyohashi, Japan

Hiroe Maeda