Nitto-denko Corporation

Yuuji Saiki

Masayuki Satake

Takashi Shouda

Seiichi Kusumoto

Yasushi Takahashi

Youichirou Sugino

Daisuke Ogomi

Hideyuki Usui

Takahisa Konishi

Senri Kondou

Muniridin Yasen

Seiji Umemoto

Minoru Miyatake

Hiroyuki Yoshimi

Shuuji Yano

Yuusuke Toyama

Ikuo Kawamoto

Kazuki Tsuchimoto

Hiroaki Mizushima

Hisashi Mihara

Masatoshi Tomonaga

Hiroe Maeda

Takuya Matsunaga

Atsushi Kitagawa

Yasuo Fujimura

Chiaki Harada

Takemichi Yoshida

Naoyuki Nitta

An iodine-based polarizer includes a polyvinyl alcohol-based film; and iodine adsorbed and oriented in the polyvinyl alcohol-based film, the iodine-based polarizer having be undergone a treatment with a treatment bath containing at least one reducing agent, the iodine-based polarizer containing an oxidized form of the reducing agent, wherein the total content of the reducing agent and the oxidized form is from 0.06&#xd7;10mol/g to 1.6&#xd7;10mol/g. The iodine-based polarizer has a sufficiently high level of transmittance, degree of polarization, and other optical properties and can suppress light leakage in short-wavelength.

Iodine-based polarizer, polarizing plate, optical film, and image display device

A method for producing a laminated optical film that allows three-dimensional images to be reproduced, which is preferably used in a large image display apparatus. One embodiment of the method includes laminating a polarizing plate and a &#x3bb;/4 plate and forming a &#x3bb;/2 layer partially on the &#x3bb;/4 plate. The polarizing plate and the &#x3bb;/4 plate are laminated such that an angle between an absorption axis of a polarizer of the polarizing plate and a slow axis of the &#x3bb;/4 plate is substantially 45&#xb0;, and the &#x3bb;/2 layer is formed such that an angle between the absorption axis of the polarizer and a slow axis of the &#x3bb;/2 layer is substantially 45&#xb0;.

Method of producing a laminated optical film

A pressure-sensitive adhesive and retardation layer-attached polarizing plate () comprises a retardation layer-attached polarizing plate () comprising a polarizing plate () that comprises an iodine-based polarizer () and a transparent protective film laminated on both sides of the polarizer and a method for manufacturing the pressure-sensitive adhesive and retardation layer attached polarizing plate ().

Pressure-sensitive adhesive and retardation layer-attached polarizing plate, method for manufacturing thereof, optical film, and image display

A polarizer of the invention comprises a polyvinyl alcohol-based film which is at least dyed with at least iodine and uniaxially stretched, having a single transmittance of 43% or more, a polarizing efficiency of 99.9% or more, and a dichroic ratio of 30 or more, wherein the dichroic ratio is calculated from a parallel transmittance (Tp) and a crossed transmittance (Tc) at a wavelength of 440 nm, and have good hue.

Polarizer, method for producing same, polarizing plate, optical film, and image display

A transparent protective film for polarizing plate being provided via an adhesive layer on at least one surface of a polarizer, wherein a ratio of constituent elements (oxygen ratio/carbon ratio) on the polarizer-adhering surface of the transparent protective film for polarizing plate, which is determined by X-ray photoelectron spectrometry, is larger than 0.75 has facilitate adhesion surface and no deformation without problems attributable to saponification.

Transparent protective film for polarizing plate, process for producing the same, polarizing plate, and optical film and liquid crystal display using polarizing plate

A polarizer used for an image display such as a liquid crystal display, a plasma display, and an electroluminescence display, and the polarizer suppresses coloring of transmitted light. The polarizer includes a polymer film having a difference of 10% or less between the maximum and the minimum of a first transmittance in a wavelength ranging from 400 nm to 700 nm.

Polarizer, polarizing plate, liquid crystal display, and image display, and a method for producing the polarizer

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 acrylic derived adhesive that is used for attachment of a polarizing plate having a difference of no more than 5% between an initial gel ratio and a gel ratio after the adhesive is heated at 80&#xb0; C. for 500 hours is efficiently used as adhesive for polarizing plate excellent in long-term preservation quality and for optical member.

Adhesive used for polarizing plate and optical member

A polarizer having good durability that is dyed by iodine, and is given boric acid processing, and moreover contains zinc without generating fault by deposit of boric acid or zinc, may be produced by a process of producing, comprising the steps of: conducting a dyeing processing by iodine to a non-stretched poly vinylalcohol film; conducting an uniaxial stretching processing and a boric acid processing; subsequently conducting a zinc impregnation processing; and furthermore, conducting an iodine ion impregnation processing.

Process of producing a polarizer, polarizer, polarizing plate, and visual display

A polarizing plate is provided with an optical compensation film and includes a polarizing plate, an adhesive layer A, an optical compensation film, and an adhesive layer B adhered to one another, wherein the polarizing plate comprises a polyvinyl alcohol polarizing film containing a dichroic substance, and wherein the elastic modulus of the adhesive layer A of the polarizing plate with an optical compensation film is not greater than 0.06 MPa. Furthermore, a liquid crystal display is provided in which the polarizing plate with an optical compensation film is furnished on at least one side of the liquid crystal cell. Thus, display irregularities can be improved.

Polarizing plate with optical compensation film and liquid crystal display

An optical member comprising an optical material or a laminated body of the optical materials in a shape a sheet or a film and an adhesive layer at least on one side thereof, wherein a repulsive force when deformed at 180&deg; in radius of 25 mm with 25 mm width shows 0.2 to 0.8 N, is used in a liquid crystal display. The optical member have a peeling strength may be decreased without decrease in adhesive strength of adhesive itself to enable easy formation of trigger for peeling.

Optical member and liquid crystal display device

A wide viewing angle polarizing plate capable of forming a liquid crystal display which causes less brightness unevenness by heat history, thereby exhibiting good visibility at a wide viewing angle, comprises a polarizing plate in which a transparent protective layer made of an compensating plate is provided on at least one surface of a polarizing film, one or both of a brightness enhanced plate and a retardation plate laminated on the polarizing plate via an adhesive layer, have a 1000% modulus at 90&deg; C. of at most 6 g/mm , thereby to form a laminate, and an adhesive layer disposed on one surface or on both surfaces of the outer surface of the laminate.

Growing community of inventors

Ibaraki, Japan

Yuuji Saiki