Nitto-denko Corporation

Kazuki Tsuchimoto

Youichirou Sugino

Seiichi Kusumoto

Tomoaki Masuda

Seiji Kondo

Eiji Hamamoto

Akihiro Nishida

Senri Kondou

Seiji Kondou

Hisashi Mihara

Takashi Shouda

Yutaka Fujita

Hiroyuki Yoshimi

Kuniaki Ishibashi

Yuuji Saiki

Shinichi Sasaki

Morimasa Wada

Yasuo Fujimura

Chiaki Harada

Makoto Komatsubara

Ryouji Kinoshita

Tomoyuki Senoo

Takafumi Ooura

Kentarou Ikeshima

Mie Oota

Ryuuichi Inoue

The present invention pertains to a method of fabricating a polarizing film by uniaxially stretching a resin film such as a polyvinyl alcohol-based film in a fabrication process including a swelling step and a dyeing step following the swelling step, comprising the steps of immersing a resin film in bath liquids in at least two or more swelling baths in sequence in the above-mentioned swelling step, wherein at least a bath temperature of a swelling bath located at a Nth position from the front-stage side is set at a temperature which is higher than a bath temperature of a swelling bath located at a (N+M)th position by 3&#xb0; C. or more (both N and M are specified positive integers).

Process for producing polarizing film, polarizing film, polarizing plate, optical film, and image display

A birefringent film with excellent uniformity in in-plane retardation, retardation in the thickness direction, and alignment axis is provided. The birefringent film is produced in such a manner that, in the step of stretching a polymer film, the polymer film is stretched in a width direction while being shrunk in a longitudinal direction, and assuming that lengths in the width direction and the longitudinal direction of the polymer film before being stretched are 1, a change ratio (STD) of the length in the width direction of the polymer film resulting from the stretching and a change ratio (SMD) of the length in the longitudinal direction of the polymer film resulting from the shrinking satisfy the following formula (1).(1/)&#x3c;1&#x2003;&#x2003;(1)

Method for producing birefringent film, optical film and image display device using the same

The method of cleaning a coated sheet according to the present invention is characterized in that dry wind is brown along the traveling direction of a film onto the surface of a coating layer wherein the solid content and the viscosity of the coating solution are within specified ranges. By this method, the thickness precision of the coating film can be improved in its large area, and the evenness of its in-plane optically functional property can be made even therein. The speed of the dry wind, the temperature of the wind, and the thickness of the dried coating film are preferably within specified ranges. In particular, the coated sheet is very useful as an optical material having good properties in an optically functional layer which is frequently used as a large-area coated sheet, an optical device having such an optically functional layer, an optically compensating layer, or an optically compensating plate. The coated sheet is particularly effective for an image display on which they are mounted.

Process for producing coated sheet, optically functional layer, optically compensating plate, optical device and image display

A method for producing a multilayer laminated film comprising: laminating a resin film having a moisture percentage of 10% by weight to 60% by weight with a first transparent film and a second transparent film each having a moisture percentage of 0.5% by weight to 5% by weight to be bonded to both sides of the resin film through an adhesive or pressure-sensitive adhesive layer interposed therebetween; wherein the laminating comprising steps of: passing the resin film and the first transparent film between a pair of a first metal roll and a first elastic roll in such a manner that the first transparent film is placed on the first metal roll side so that they are bonded to each other under pressure to form a laminated film; and then, using the laminated film without winding up it and passing the laminated film and the second transparent film between a pair of a second metal roll and a second elastic roll in such a manner that the second transparent film is placed on the second metal roll side so that they are bonded to each other under pressure to form a multilayer laminated film. The method can prevent bubbles from being formed between the resin film and the transparent film.

Method for producing multilayer laminated film

A method for manufacturing a coated sheet that forms a coated layer having a uniform film thickness by a coating liquid even when a substrate has a large area. A method for manufacturing a coated sheet to form a coated layer by a process including a process () for coating a coating liquid including a resin material and a solvent on a substrate, and a drying process () for drying a coated liquid, wherein a drying speed of a coated liquid in the drying process () is set 0.3 [g/m&#xb7;s] or less.

Method for manufacturing coated sheet, optical functional layer, optical element, and image display device

A method for manufacturing a coated sheet that may form a coated layer having a uniform film thickness by a coating liquid even when a substrate has a large area is provided. A method for manufacturing a coated sheet to form a coated layer by a process including a process () for coating a coating liquid including a resin material and a solvent on a substrate, and a drying process () for drying a coated liquid, wherein a drying is performed under drying wind flow having an average wind speed of 10 m/s or less until a viscosity of the coated liquid in the drying process () reaches at least 50 [mPa&#xb7;s] at drying temperatures.

A method for manufacturing a coated sheet that may form a coated layer having a uniform film thickness by a coating liquid even when a substrate has a large area. A method for manufacturing a coated sheet to form a coated layer by a process including a process (1) for coating a coating liquid including a resin material and a solvent on a substrate, and a drying process (2) for drying a coated liquid, wherein a value L obtained in drying process (2) satisfies a following relationship; (where: T: total period of drying process [sec]; &#x3c3;: surface tension of coated liquid [mN/m]; h: thickness of coated liquid [m]; and &#x3b7;: viscosity of coated liquid [mPa&#xb7;sec]).

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 polarizing film may be manufactured without using adhesives by a method in which a protective film (B) is laminated onto at least one face of a polarizer (A), then adhered by thermocompression bonding. Thus problems on manufacturing method of a polarizing film possibly caused by use of adhesives will not be generated.

Manufacturing method of polarizing film, polarizing film, optical film, and visual display

A polarizing film comprising a polarizer (A) and a protection film (B) prepared on at least one face of the polarizer (A), wherein the protection film (B) is adhered to the polarizer (A) without using adhesives, is induced problems by use of adhesives.

Polarizing film, optical film and liquid crystal display using polarizing film

A polarizing plate produced according to the present invention includes a polarizing film and a protective layer bonded to a surface of the polarizing film, where the protective layer has no irregularities like record grooves caused by stretching of the polarizing film, so that the polarizing plate with an improved appearance provides clear images even when reflected light is applied. Such a polarizing plate is produced by laminating a protective layer on at least one surface of a polarizer while limiting moisture content of the polarizer to a range from 5% to 30%. A value for the moisture content is obtained by a calculation based on an equation of moisture content (%)=[(A&#x2212;B)/B]&#xd7;100, when A denotes weight of the polarizer before bonding and B denotes weight of the polarizer after being kept in a dryer of 120&#xb0; C. for seven hours.

Method of producing polarizing plate, and liquid crystal display comprising the polarizing plate

A polarizing plate having excellent moisture durability and a liquid crystal display using the same are disclosed. The polarizing plate is produced by covering all surfaces and sides of a polarizer with low moisture-permeable layers having moisture permeability of 310 g/m&#xb7;24 h or less. The rate of change in dimension of the polarizer in the uniaxially stretched direction is &#xb1;0.1% or less after left at a temperature of 60&#xb0; C. and humidity of 95% for 100 hours.

Polarizing plate having polarizer sides covered with low moisture permeable layers with permeability different than protective films covering the polarizer surfaces

An oriented film of polyvinyl alcohol derived film with reduced stretch irregularity and uniform orientation in a wide range of a stretching ratio is obtained by a manufacturing method for an oriented film, comprising the steps of: contacting a non-stretched film, comprising polyvinyl alcohols or derivatives thereof, with moisture percentage adjusted to no more than 10%, to at least one heating roll currently driven and heating the film at no less than 70&#xb0; C.; subsequently giving a tension and stretching using a peripheral velocity difference between the heating roll concerned and a stretch roll in a position ahead of said heating roll in a running direction of the film.

Manufacturing method for oriented film, polarizing film, polarizing plate, and visual display

The present invention provides a polarizing film having a high polarization degree and high transmittance, a process for producing the polarizing film, and a polarizing plate using the polarizing film, and an optical member. In the process for producing the polarizing film, a polyvinyl alcohol-based film is dry-stretched uniaxially, relaxed in an aqueous solution containing iodine or a dichroic dyestuff, and further stretched in an aqueous solution containing a PVA crosslinking agent. It is preferable that the polyvinyl alcohol-based film has a dry-stretch ratio of at least 2, the film after relaxation has a stretch ratio of at least 1.02, and the total stretch ratio is at most 6.5. It is also preferable that the relaxation rate is at most 10% of the dry-stretch ratio.

Growing community of inventors

Ibaraki, Japan

Kazuki Tsuchimoto