Nitto-Denko Corporation

Nippon Shokubai Co., Ltd.

Hiroaki Mizushima

Tadayuki Kameyama

Morimasa Wada

Satoru Yamamoto

Youichirou Sugino

Naoki Tomoguchi

Minoru Miyatake

Kenji Shimizu

Megumi Katou

Ken Aoki

Takeharu Kitagawa

Hiroyuki Yoshimi

Yuusuke Toyama

Takaaki Ishii

Daisuke Ogomi

Yuuji Saiki

Mizue Nagata

Mie Nakata

Toshimasa Sugimura

Takemichi Yoshida

Muniriding Yasen

Yoshimi Oota

Naoyuki Nitta

Yoichiro Sugino

An iodine polarizing film includes a polymer film and iodine adsorbed and oriented on the polymer film, wherein an iodine content of the polarizing film is within the range of 1.9 to 3% by weight per 2.85 mm, a single transmittance of the polarizing film is within the range of 43 to 45%, and a ratio (A2/A1) of a crossed absorbance A2 at a wavelength of 610 nm to a crossed absorbance Al at a wavelength of 480 nm is 1.16 or less.

Iodine polarizing film, method of producing the same, and polarizing plate comprising the same

An end face of a sheet member is cut while rotating a cutting member having a rotation axis extending along a vertical direction of the end face of the sheet member and a cutting blade projecting to a side of the end face of the sheet member around the rotation axis. The cutting member is moved relatively to the sheet member along a longitudinal direction of the end face to be cut. The part separated from a virtual line parallel to the sheet face and passing the rotation center in a cutting region formed by the rotating cutting blade is made to contact the end face of the sheet member.

Cutting method and manufacturing method of sheet member, sheet member, optical element, and image display device

A polarizer that can be used for forming a liquid crystal display or an electroluminescent display with less display irregularities and excellent display characteristics is provided. The polarizer contains a dichroic material in a matrix, and its in-plane retardation at a measurement wavelength providing no absorption is in a range of 950 to 1350 nm. The measurement wavelength is preferably a wavelength that the dichroic material provides no absorption, and it is 1000 nm, for example.

Polarizer, optical film using the same, and image display device using the same

A polarizing plate of the present invention includes a stretched laminate that is a laminate including a base material layer and a hydrophilic polymer layer and has undergone a stretching process, and at least a dichroic substance is adsorbed to the hydrophilic polymer layer. The polarizing plate of the present invention can be prevented from curling even when the polarizer is reduced in thickness.

Polarizing plate, optical film and image display

A polarizing plate of the present invention includes a polyvinyl alcohol-based polarizer; and transparent protective films provided on both sides of the polarizer with an adhesive layer interposed between the polarizer and each transparent protective film, wherein the transparent protective film on one side comprises a lactone ring structure-containing (meth)acrylic resin and has an in-plane retardation of less than 40 nm and a thickness direction retardation of less than 80 nm, and the transparent protective film on the other side is a retardation plate that comprises a cellulose ester and satisfies the relation: nx&#x3e;ny&#x3e;nz, wherein nx is a refractive index in an X-axis direction where the in-plane refractive index is maximum, ny is a refractive index in a Y-axis direction perpendicular to the X-axis, and nz is a refractive index in a Z-axis direction corresponding to the thickness direction. The polarizing plate can satisfy durability and display uniformity (unevenness).

Polarizing plate, manufacturing method thereof, optical film and image display

The combination optical film of the invention comprises a plurality of optical films in which at least one end face of the optical films are butted against one another, wherein the butted end faces substantially match one another in shape, the butted end faces each have a portion non-vertical to the front and back surfaces of the optical films, and the end faces are butted against one another so as not to form a continuous gap in the normal direction of the optical films from the front to back surfaces. The combination optical film can prevent light leakage without degrading appearance.

Combination optical film, laminated combination optical film and image display

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

This invention provides a method for manufacturing a combination-type optical film comprising a plurality of optical films each having at least one end face at which the optical films are opposed to one another, comprising the steps of:

Method for manufacturing combination-type optical film, apparatus for the method, combination-type optical film and image display device

The present invention provides a method for manufacturing a polarizing film, by which, even when a wide raw film is used, it is possible to obtain a polarizing film that achieves excellent optical characteristics as well as uniformity in in-plane optical characteristics. The method includes the steps of dyeing a polymer film; stretching the dyed film; and drying the film that has undergone the dyeing and stretching steps while conveying the film with rolls. In the drying step, at least two rolls are used as the rolls and the film is dried under a condition that a ratio (R/W) of a distance (R) between the adjacent rolls to an initial width (W) of the polymer film is not less than 0.5 and not more than 4.0.

Method for manufacturing polarizing film, polarizing film obtained by the method, and image display apparatus using the polarizing film

A method for producing a polarizing film, including: a dyeing step and a stretching step, a plurality of films being dipped into at least one processing liquid without contacting each other.

Method for producing polarizing film, polarizing film, and image display using the polarizing film

A polarizing film is provided that prevents display unevenness and can form a liquid crystal display and an electroluminescence display that exhibit excellent display characteristics. The polarizing film is produced in the following manner. That is, a hydrophilic polymer film is conveyed by means of a guide roll so as to be impregnated in an aqueous solvent in a swelling bath and is allowed to swell. In this swelling step, at least a first guide roll is arranged in the swelling bath, and when the polymer film is impregnated in and allowed to travel in the aqueous solvent, the polymer film is brought into contact with the first guide roll within a time up to when swelling reaches a saturation state. Further, the polymer film is dyed using a dichroic substance and stretched.

Method for manufacturing polarizing film and polarizing film and optical film manufactured by using the method

An adhesive for polarizing plate used in order to provide a transparent protective film on at least one surface of a polarizer, comprising a crosslinking agent in the range of more than 30 parts by weight and 46 parts by weight or less relative to 100 parts by weight of a polyvinyl alcohol-based resin having an acetoacetyl group, is excellent in water resistance.

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

An adhesive of the invention for polarizing plates used for forming an adhesive layer in a polarizing plate in which a polarizer and a transparent protective film is are adhering with each other via the adhesive layer, wherein the adhesive for polarizing plates is an aqueous solution containing a polyvinyl alcohol-based resin having an acetoacetyl group and a crosslinking agent, and the aqueous solution has a pH of 4.3 or less. The adhesive of the invention for polarizing plates is good in durability and long in pot life.

A method for producing a polarizing plate of the invention comprises bonding a transparent protective film (A) and another transparent protective film (B) to one side of a polarizer and to another side of the polarizer, respectively, with an adhesive, wherein the polarizer has a moisture content of 15 to 30% by weight, the transparent protective film (A) is made of the same quality material as the transparent protective film (B), the transparent protective film (A) is thicker than the transparent protective film (B), and the transparent protective film (A) has a moisture content higher than that of the transparent protective film (B). The polarizing plate obtained by the production method can suppress curling.

Growing community of inventors

Ibaraki, Japan

Hiroaki Mizushima