Nitto-denko Corporation

Takeharu Kitagawa

Shusaku Goto

Takashi Kamijo

Minoru Miyatake

Tomohiro Mori

Takuya Nakazono

Atsushi Yasui

Masayuki Satake

Yuusuke Toyama

Tomoyuki Kimura

Kentaro Yoshida

Nao Murakami

Hiroyuki Yoshimi

Takaaki Ishii

Akinori Izaki

Hiroaki Sawada

Kentarou Takeda

Satoru Kunikata

Nobuyuki Haida

Yuki Kida

Takashi Shimizu

Hideki Ishida

Toshiyuki Iida

Daisuke Hayashi

Masakuni Fujita

Toshitsugu Hosokawa

Kenichi Okada

Junichi Nagase

Hiroaki Mizushima

Hirofumi Katami

Taiki Shimokuri

Yusuke Toyama

Toshitaka Takahashi

Takeshi Saitou

Tadashi Kojima

Takuya Mori

Yousuke Makihata

Hiroshi Sumimura

Kunihiro Inui

Muniridin Yasen

Shuusaku Nakano

Shinsuke Akizuki

Arata Fujihara

Toshimasa Sugimura

Hitoshi Kitagishi

Ryohei Sawazaki

Daigoro Nakagawa

Yuji Miyaki

Takeshi Nishibe

There is provided a polarizing plate with a retardation layer that can achieve an image display apparatus having excellent durability and excellent weatherability, and having an excellent hue. A polarizing plate with a retardation layer according to an embodiment of the present invention includes in this order: a polarizing plate including a protective layer and a polarizer; a retardation layer; and a pressure-sensitive adhesive layer. The protective layer has a light transmittance at a wavelength of 380 nm of 10% or less. The polarizing plate has a light transmittance at a wavelength of 380 nm of 5% or less. The pressure-sensitive adhesive layer has a light transmittance at a wavelength of 405 nm of 5% or less. The polarizing plate with a retardation layer has a light transmittance at a wavelength of 405 nm of 3% or less.

Polarizing plate with retardation layer and image display device

Provided are a separator-attached adhesive layer structure which comprises a separator having moderate light peelability with respect to an adhesive layer and exhibits excellent processability and durability, and a production method therefor. The production method comprises: a first step of forming a layer of an adhesive composition containing a (meth)acryl-based polymer, a peroxide and a phenolic antioxidant, on a release treatment surface of a separator subjected to a release treatment; and a second step of, after completion of the first step, heating the adhesive composition to cause cross-linking therein so as to be formed as an adhesive layer.

Separator-attached adhesive layer structure and production method therefor, separator-attached adhesive layer and polarizing film combination structure and production method therefor, and image display device

As a result of a reduction in thickness of an IPS liquid crystal display panel, curl has started to occur in a structure where an optical film such as a polarizer or a retardation film is laminated to the IPS liquid crystal display panel. The present invention is directed to thinning a polarizer which is easily expandable and contractable, and thinning a retardation film located between the polarizer and an IPS liquid crystal display panel to enable the polarizer to come closer to the IPS liquid crystal display panel than ever before to thereby prevent curl of the IPS liquid crystal display panel.

Continuous optical film laminate, roll of continuous optical film laminate and IPS liquid crystal display device

A method of producing a roll of an optical film laminate strip includes the steps of: forming an optical film laminate which includes an optical film having a continuous web of polarizing film, and a resin film bonded to the optical film; creating a reference mark to extend across the optical film laminate in a width direction thereof; performing a defect inspection for detecting a defect existing in the optical film, and, when a defect is detected, recording a position of the defect in the form of a laminate widthwise position and a laminate lengthwise position as measured from the reference mark; cutting the optical film laminate along a direction parallel to the length direction to form a plurality of continuous webs of laminate strips; based on the widthwise position of the defect detected by the defect inspection, determining which of the cut laminate strips has the defect, and, with respect to a specific laminate strip which is determined to have the defect, storing information about the defect together with identification information for identifying the specific laminate strip; and winding each of the laminate strips into a roll.

Method of producing roll of laminate strip with polarizing film

A polarizing plate including an optical functional film and a polarizing film (polarizer), the polarizing plate being thin and excellent in durability of the polarizing film. The polarizing plate includes an optical functional film, a pressure-sensitive adhesive layer, a polarizing film, and a protective film in the stated order, in which: the polarizing film has a thickness of 15 &#x3bc;m or less; the pressure-sensitive adhesive layer has a thickness of 15 &#x3bc;m or less; the optical functional film has a moisture permeability of 200 g/m/24 h or less; and the protective film has a moisture permeability of 1,000 g/m/24 h or less.

Polarizing plate comprising an optical functional film and a protective film having a specified moisture permeability

An aqueous dispersion-type pressure-sensitive adhesive composition for an optical film includes a emulsion particles of a core-shell structure, wherein the emulsion particles include a (meth)acryl-based copolymer (A) having a glass transition temperature of &#x2212;55&#xb0; C. to 0&#xb0; C. and a (meth)acryl-based copolymer (B) having a glass transition temperature of 0&#xb0; C. to 180&#xb0; C., in a single emulsion particle, one of the copolymers (A) and (B) forms a core layer, and another forms a shell layer, at least one of the copolymers (A) and (B) contains a carboxyl group-containing monomer, a difference of the glass transition temperatures between the copolymers (A) and (B) is 50&#xb0; C. or more, and a ratio (A)/(B) (by weight) is in the range of 50/50 to 90/10.

Pressure-sensitive adhesive composition for optical film, pressure-sensitive adhesive layer for optical film, pressure-sensitive adhesive optical film, and image display device

A pressure-sensitive adhesive layer-attached polarizing film of the invention includes: a polarizing film; and a pressure-sensitive adhesive layer provided on the polarizing film, wherein the polarizing film includes a polarizer and a transparent protective film provided on only one side of the polarizer, the pressure-sensitive adhesive layer is provided on a side of the polarizer where the transparent protective film is absent, and the pressure-sensitive adhesive layer is made of a pressure-sensitive adhesive composition containing a (meth)acryl-based polymer (A) and an alkali metal salt (B). The pressure-sensitive adhesive layer-attached polarizing film has a pressure-sensitive adhesive layer with an antistatic function and satisfactory durability and whose optical properties are less likely to be degraded.

Pressure-sensitive adhesive layer-attached polarizing film and image display

A method of producing a thin polarizing film having an excellent polarization degree includes, forming a polyvinyl alcohol-based resin layer on a thermoplastic resin substrate to prepare a laminate, subjecting the laminate to underwater stretching in an aqueous solution of boric acid and stretching the laminate while drying the laminate after the underwater stretching.

Method of producing thin polarizing film involving in-air stretching, underwater stretching, and stretching while drying

There is provided a polarizing plate with a retardation layer being extremely thin and having excellent durability. A polarizing plate with a retardation layer includes a polarizer; a protective layer bonded onto one side of the polarizer through intermediation of a first adhesive layer; and a retardation layer bonded onto another side of the polarizer through intermediation of a second adhesive layer. The polarizer has a thickness of from 2 &#x3bc;m to 12 &#x3bc;m, a boric acid content of 18 wt % or more, an iodine content of 2.1 wt % or more, a single layer transmittance of 44.2% or more, a polarization degree of 98% or more, and an orientation function of 0.35 or more. The retardation layer has a thickness of 50 &#x3bc;m or less and a birefringence &#x394;nxy of 0.0025 or more. The first and second adhesive layer each has a thickness of 2 &#x3bc;m or less.

Polarizing plate with phase-difference layer and image display device

There is provided a thin polarizing plate with a retardation layer excellent in reworkability. A polarizing plate with a retardation layer according to the present invention includes: a polarizing plate including a polarizer and a protective layer on at least one side of the polarizer; a retardation layer; a first adhesive layer configured to bond the polarizing plate and the retardation layer; and a second adhesive layer arranged as an outermost layer on an opposite side of the retardation layer to the polarizing plate. An average linear expansion coefficient of the second adhesive layer when an ambient temperature is changed from &#x2212;150&#xb0; C. to 20&#xb0; C. is 38.0(&#xd7;10/&#xb0; C.) or more, and is larger than an average linear expansion coefficient of the first adhesive layer when an ambient temperature is changed from &#x2212;150&#xb0; C. to 20&#xb0; C.

Polarizing plate with a retardation layer and image display apparatus

A liquid crystal panel which is capable of significantly reducing a thickness thereof as compared to conventional liquid crystal panels, and, when used in a liquid crystal display device using a liquid crystal cell such as an IPS-type liquid crystal cell, reducing oblique light leakage in a black state of the liquid crystal display device to enhance contrast.

Liquid crystal panel and polarizing laminate for use in the liquid crystal panel

A polarizing plate of the present invention includes: a first adhesion layer, a transparent protective layer, a second adhesion layer, and a polarizing film in the stated order, wherein: the first adhesion layer has a thickness of 10 &#x3bc;m or more; the transparent protective layer has a thickness of 30 &#x3bc;m or less; the transparent protective layer has a moisture permeability of 200 g/m/24 hr or less; the second adhesion layer has a bulk water absorption ratio of 10 wt % or less; the polarizing film has a thickness of 10 &#x3bc;m or less; and the polarizing film has a boric acid content of 18 wt % or less with respect to a weight of the polarizing film.

Polarizing plate and optical laminate

Provided a polarizing film which comprising a substrate and a PVA-based resin, wherein it has good adhesion between the substrate and the PVA-based resin to allow the PVA-based resin to become less likely to be peeled off from the substrate during stretching and/or conveyance, and exhibits excellent appearance, wherein the polarizing film is obtained by providing a layer of a PVA-based resin on a substrate and stretching the substrate and the PVA-based resin layer together. The PVA-based resin contains a modified PVA, wherein the modified PVA exists in an amount allowing a modification rate with respect to the entire PVA-based resin to be in a range of 0.04 mol % to 1.4 mol %.

Polarizing film obtained by acetoacetyl-modified PVA-based resin having specified modification rate

A method of producing an optical panel assembly including the polarizing film in a continuous manner by laminating a polarizing film to a surface of a rectangular-shaped optical panel, is disclosed. The polarizing film is formed by performing a step of subjecting a laminate including a continuous web of a thermoplastic resin substrate and a PVA type resin layer formed on the substrate, to a 2-stage stretching consisting of a preliminary in-air stretching and an in-boric-acid-solution stretching, to reduce a thickness of the PVA type resin layer to 10 &#x3bc;m or less, and a step of causing a dichroic material to be absorbed in the PVA type resin layer.

Method and apparatus for continuously producing optical panel assemblies

A method for manufacturing a thin high-performance polarizing film includes coating a polyvinyl alcohol type resin on a resin substrate having a thickness of at least 20 &#x3bc;m and then drying the resin to thereby form a polyvinyl alcohol type resin layer, immersing thus produced polyvinyl alcohol type resin layer in a dyeing solution including a dichroic material to thereby have the dichroic material impregnated in the polyvinyl alcohol type resin layer, stretching the polyvinyl alcohol type resin layer having the dichroic material impregnated therein together with the resin substrate in a boric acid solution such that a total stretching ratio of 5.0 or more of the original length is achieved.

Thin high-performance polarizing film and method for manufacturing the same

Growing community of inventors

Ibaraki, Japan

Takeharu Kitagawa