Nitto-denko Corporation

Tomonori Ueno

Atsushi Kishi

Satoshi Mita

Yusuke Motegi

Jingfan Xu

Hiroki Kuramoto

Kentaro Ikeshima

Shinya Hiraoka

Hiromi Ikeshima

Minoru Miyatake

Kentarou Takeda

Takami Hikita

Yasutaka Ishihara

Emi Miyai

Toshiki Omine

Ayami Nakato

A surface-protective film attached polarizing film is disclosed which includes a polarizing film (A) having a thickness of 100 &#x3bc;m or less, and a surface-protective film (B) provided on at least one surface of the polarizing film (A), wherein the polarizing film (A) comprises a polarizer, and a protective film provided on at least one surface of the polarizer, the polarizer comprises a polyvinyl alcohol-based resin and has a thickness of 10 &#x3bc;m or less, the polarizing film (A) has a width W, the surface-protective film (B) has a width W, a difference between the widths Wand W(W&#x2212;W) is 3 mm or more, and a peel strength of the surface-protective film (B) to the polarizing film (A) is 0.2 N/25-mm or less. The surface-protective film-attached polarizing film allows to be restrained the polarizing film from being broken, when the surface-protective film is peeled from the polarizing film.

Surface-protective film-attached polarizing film, and method for producing polarizing film

A polarizing film provided on the viewing side in an image display device of the present invention, wherein the polarizing film has a polarizer and a first transparent resin layer on the viewing side of the polarizer. The polarizer contains a polyvinyl alcohol-based resin, has a thickness of 10 &#x3bc;m or less, and has, on the side of the first transparent resin layer, a compatible layer which is compatible with the first transparent resin layer and which corresponds to a thickness of 2 to 10% of the thickness of the polarizer. This polarizing film can make it possible to inhibit color phase changes when displaying black, even when a thin-type polarizer is being used.

Polarizing film and image display device

The present invention pertains to a one-side-protected polarizing film having a protective film or films on only one surface of a polarizer, wherein: the polarizer contains a polyvinyl alcohol-based resin, and is designed to have a single-body transmittance T and a polarization degree P representing optical properties satisfying the condition of the following formula: P&#x3e;&#x2212;(10&#x2212;1)&#xd7;100 (provided that T&#x3c;42.3) or P&#x2265;99.9 (provided that T&#x2265;42.3), and the polarizer and a transparent resin layer have a thickness X (&#x3bc;m) and a thickness Y (&#x3bc;m), respectively, satisfying X&#x2264;12, Y&#x2264;15, and 0.15&#x2264;(Y/X)&#x2264;3. Even when the thin-type polarizer has prescribed optical properties, this one-side-protected polarizing film is capable of suppressing the occurrence of through cracks, nano-slit-induced defects and curling.

One-side-protected polarizing film, pressure-sensitive-adhesive-layer-attached polarizing film, image display device, and method for continuously producing same

The present invention is a one-side-protected polarizing film having a polarizer and a protective film provided on only one surface of the polarizer, wherein the polarizer contains a polyvinyl alcohol-based resin, has a thickness of 10 &#x3bc;m or less, and is configured so that optical properties represented by a single-body transmittance T and a polarization degree P satisfy the following relationship: P&#x3e;&#x2212;(10&#x2212;1)&#xd7;100 (provided that T&#x3c;42.3) or P&#x2265;99.9 (provided that T&#x2265;42.3), a transparent layer is provided on another surface of the polarizer, and a dynamic friction coefficient of the surface on which the protective film is provided is 0.2 or less. In this one-side-protected polarizing film, it is possible to resist the occurrence of through cracks and nano-slits even when the polarizer has specific optical properties and a thickness of 10 &#x3bc;m or less.

A polarizing film is disclosed including a polarizer having a thickness of 10 &#x3bc;m or less, and a transparent resin layer on at least one surface of the polarizer,

Polarizing film, pressure-sensitive-adhesive-layer-attached polarizing film, method for producing polarizing film, and image display device

A polarizer according to the patent invention is configured to contain boric acid and a polyvinyl alcohol-based resin, to have a thickness of 10 &#x3bc;m or less, and to have an optical property satisfying the condition represented by the expression: P&#x3e;&#x2212;(10&#x2212;1)&#xd7;100 (when T&#x3c;42.3) or P&#x2265;99.9 (when T&#x2265;42.3), wherein T represents the single-body transmittance and P represents the polarization degree. In addition, a boric acid content (a) measured from one side of the polarizer, the one side to be provided with the pressure-sensitive adhesive layer, is less than a boric acid content (b) measured from the other side. The polarizer according to the patent invention can reduce defects due to through cracks and nano-slits even when the polarizer has predetermined optical properties and a thickness of 10 &#x3bc;m or less.

Polarizer, one-side-protected polarizing film, pressure-sensitive-adhesive-layer-attached polarizing film, image display device, and method for continuously producing same

There is provided an optical laminate capable of toeing suitably applied even to an organic EL display apparatus that is extremely thin and is bendable or foldable. An optical laminate according to an embodiment of the present invention is used for an organic electroluminescence display apparatus. The optical laminate includes in this order: a surface protective layer; a polarizer; and an optical compensation layer. The surface protective layer is flexible, has a function of substituting for a cover glass for an organic electroluminescence display apparatus, and functions as a protective layer for the polarizer.

Optical laminated body and organic electroluminescence display device using same

The present invention pertains to a polarizing film having a transparent resin layer on at least one side of a polarizer containing a polyvinyl alcohol-based resin, wherein the transparent resin layer has a thickness of 0.2 &#x3bc;m or more and is formed from a layer-forming material containing a polyvinyl alcohol-based resin having a saponification degree of 96 mol % or more, and wherein the combined total content of sodium acetate and potassium acetate contained in the transparent resin layer is less than 1 wt %. This polarizing film has crack-resistant properties, and can minimize degradation of the optical characteristics in a heating and humidifying test.

Polarizing film, pressure-sensitive-adhesive-layer-attached polarizing film, and image display device and method for continuously producing same

The present invention pertains to a polarizing film having a transparent layer on at least one surface of a polarizer, wherein: the polarizer contains a polyvinyl alcohol-based resin and has a thickness of 15 &#x3bc;m or less; the transparent layer-side of the polarizer has a compatible layer thereon having compatibility with the transparent layer; and the thickness A of the polarizer and the thickness B of the compatible layer satisfy the general formula (100&#xd7;B/A)&#x2265;1. This polarizing film has crack resistance and suppresses changes in the dimensions of the polarizer.

Polarizing film, pressure-sensitive-adhesive-layer-attached polarizing film, and image display device

The present invention pertains to a one-side-protected polarizing film having a transparent protective film on only one surface of a polarizer, wherein: the polarizer contains a polyvinyl alcohol-based resin, has a thickness of 10 &#x3bc;m or less, and is designed to have a single-body transmittance T and a polarization degree P representing optical properties satisfying the condition of the following formula: P&#x3e;&#x2212;(10&#x2212;1)&#xd7;100 (provided that T&#x3c;42.3) or P&#x2265;99.9 (provided that T&#x2265;42.3); and the other surface of the polarizer has a transparent layer having a compressive elastic modulus at 80&#xb0; C. of 0.1 GPa or more. Even when the polarizer has prescribed optical properties and the thickness is 10 &#x3bc;m or less, this one-side-protected polarizing film is capable of suppressing the occurrence of through cracks and nano-slits.

A method for producing a polarizing film includes (1) preparing a laminate (a) which includes a carrier film and a polarizer with a thickness of 10 &#x3bc;m or less formed on one surface of the carrier film and contains a polyvinyl alcohol-based resin; (2) peeling off the carrier film from the laminate (a); and (3) applying a liquid material to a side of the laminate (a) from which the carrier film has been peeled off and then solidifying or curing the liquid material to form a transparent resin layer with a thickness of 0.2 &#x3bc;m or more, wherein the liquid material contains a resin component or a curable component capable of forming a resin layer. This production method enables the achievement of a polarizing film which is able to have satisfactory durability in a heated environment even in cases where a thin polarizer is used therefor.

Method for producing polarizing film

A one-side-protected polarizing film having a transparent protective film on only one surface of a polarizer, wherein: the polarizer contains a polyvinyl alcohol-based resin, has a thickness of 10 &#x3bc;m or less, and is designed to have a single-body transmittance T and a polarization degree P representing optical properties satisfying the condition of the following formula: P&#x3e;&#x2212;(10&#x2212;1)&#xd7;100 (provided that T&#x3c;42.3) or P&#x2265;99.9 (provided that T&#x2265;42.3); and the other surface of the polarizer has a transparent layer thereon satisfying formula 1 (F&#x2265;3) and formula 2 (C&#x2265;e), given that the thickness thereof is F (&#x3bc;m) and the compressive elastic modulus thereof at 80&#xb0; C. is C (GPa). Even when the polarizer has prescribed optical properties and the thickness is 10 &#x3bc;m or less, this one-side-protected polarizing film is capable of suppressing through cracks and nano-slits.

The present invention pertains to a one-side-protected polarizing film having a transparent protective film on only one surface of a polarizer, wherein: the polarizer contains a polyvinyl alcohol-based resin, has a thickness of 10 &#x3bc;m or less, and is designed to have a single-body transmittance T and a polarization degree P representing optical properties satisfying the condition of the following formula: P&#x3e;&#x2212;(10&#x2212;1)&#xd7;100 (provided that T&#x3c;42.3) or P&#x2265;99.9 (provided that T&#x2265;42.3); and the other surface of the polarizer has a transparent resin layer having a thickness of 0.2 &#x3bc;m or more and formed from a layer-forming material including a polyvinyl alcohol-based resin. Even when the polarizer has prescribed optical properties and the thickness is 10 &#x3bc;m or less, this one-side-protected polarizing film is capable of suppressing the occurrence of through cracks and nano-slits.

One-sided-protected polarizing film, pressure-sensitive-adhesive-layer-attached polarizing film, image display device, and method for continuously producing same

Provided is a hard coat film, including: a transparent film; and a hard coat layer formed on the transparent film, in which: the surface free energy of the hard coat layer is equal to or more than a certain value; the hard coat film has a mixed region in which a component of the transparent film and a component of the hard coat layer are mixed; the refractive index of the mixed region continuously changes toward the thickness direction of the hard coat film; and a refractive index change gradient falls within a certain range.

Hard coat film, polarizing plate, and image display apparatus

There is provided an anti-reflection film that has an excellent reflection characteristic (low reflectivity) in a wide spectrum and has an excellent reflection hue that is close to neutral, and a method by which such anti-reflection film can be produced with high productivity and at a low cost. An anti-reflection film according to the present invention includes: a substrate; and a medium-refractive index layer, a high-refractive index layer, and a low-refractive index layer in the stated order from a substrate side. A refractive index nof the substrate, a refractive index nof the medium-refractive index layer, and a refractive index nof the high-refractive index layer satisfy the following expression (1): where the refractive index nof the substrate, the refractive index nof the medium-refractive index layer, and the refractive index nof the high-refractive index layer have a relationship of n&#x3e;n&#x3e;n.

Growing community of inventors

Ibaraki, Japan

Tomonori Ueno