Nitto-denko Corporation

Yusuke Motegi

Atsushi Kishi

Tomonori Ueno

Satoshi Mita

Jingfan Xu

Minoru Miyatake

Kentaro Ikeshima

Yasutaka Ishihara

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

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

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

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 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

Growing community of inventors

Ibaraki, Japan

Yusuke Motegi