Abstract: A method for producing a retardation film comprising the steps of: co-extruding or simultaneously casting a thermoplastic resin A and a thermoplastic resin B to obtain a laminated film comprising a layer of the thermoplastic resin A and a layer of the thermoplastic resin B; and uniaxially stretching the laminated film at least twice to cross a molecular orientation axis in the layer of the thermoplastic resin A and a molecular orientation axis in the layer of the thermoplastic resin B each other at almost right angles.

Abstract: A method for producing a retardation film comprising the steps of: (a) uniaxially stretching an original film for producing retardation film in one direction at either a temperature T1 or T2; and then (b) uniaxially stretching the film stretched in the step (a) in a direction perpendicular to the above-mentioned direction of stretching at a temperature T2 or T1 different from the above-mentioned temperature, in which the original film for producing retardation film has a characteristic that a phase of linearly polarized light entering vertically into the film plane and having an oscillating surface of an electric vector in an X-Z plane against linearly polarized light entering vertically into the film plane and having an oscillating surface of an electric vector in a Y-Z plane lags by uniaxially stretching in the direction of the X axis at a temperature T1, and leads by uniaxially stretching in the direction of the X axis at a temperature T2 different from the above-mentioned temperature T1, in which the X ax

Abstract: An organic EL display device including a substrate, a transparent electrode, a luminescent layer, and a metal electrode layer in this order from a light emission side, a circularly polarizing plate disposed on the light emission side of the substrate, the circularly polarizing plate including a polarizing film and phase difference films that stacked on each other. The phase difference film includes a resin composition (A) containing polystyrene-based polymer having a syndiotactic structure and polyarylene ether, a ratio of the polystyrene-based polymer having the syndiotactic structure with respect to the polyarylene ether in the resin composition (A) is 65:35 to 55:45, being a weight ratio of (the polystyrene-based polymer having the syndiotactic structure) with respect to (the polyarylene ether), the phase difference film satisfies a relation Re450<Re550<Re650, and an Nz coefficient of the phase difference film at a wavelength of 550 nm is ?0.25 to ?0.05.

Abstract: A phase difference plate is manufactured by a method including a step of forming a multilayer body by co-extruding or co-casting a resin A having a positive intrinsic birefringence value and a resin B having a negative intrinsic birefringence value, the multilayer body including a layer “a” containing the resin A and a layer “b” containing the resin B; a step of stretching the multilayer body at a temperature T1 in one direction; and a step of subsequently stretching the multilayer body at temperature T2 lower than the temperature T1 in a direction that is approximately orthogonal to the previous stretching direction. The resulting phase difference plate has specific in-plane retardation Rea of the layer “a”, retardation Rta in the thickness direction thereof, in-plane retardation Reb of the layer “b”, and retardation Rtb in the thickness direction thereof.

Abstract: A method for producing a retardation film comprising the steps of: co-extruding or simultaneously casting a thermoplastic resin A and a thermoplastic resin B to obtain a laminated film comprising a layer of the thermoplastic resin A and a layer of the thermoplastic resin B; and uniaxially stretching the laminated film at least twice to cross a molecular orientation axis in the layer of the thermoplastic resin A and a molecular orientation axis in the layer of the thermoplastic resin B each other at almost right angles.

Abstract: An organic EL display device including a substrate, a transparent electrode, a luminescent layer, and a metal electrode layer in this order from a light emission side, a circularly polarizing plate disposed on the light emission side of the substrate, the circularly polarizing plate including a polarizing film and phase difference films that stacked on each other. The phase difference film includes a resin composition (A) containing polystyrene-based polymer having a syndiotactic structure and polyarylene ether, a ratio of the polystyrene-based polymer having the syndiotactic structure with respect to the polyarylene ether in the resin composition (A) is 65:35 to 55:45, being a weight ratio of (the polystyrene-based polymer having the syndiotactic structure) with respect to (the polyarylene ether), the phase difference film satisfies a relation Re450<Re550<Re650, and an Nz coefficient of the phase difference film at a wavelength of 550 nm is ?0.25 to ?0.05.

Abstract: A phase difference film layered body is obtained by stretching a film before stretching, the film before stretching including: a P1 layer formed of a resin p1 containing polyphenylene ether having a positive intrinsic birefringence value and a polystyrene-based polymer having a negative intrinsic birefringence value and having a syndiotactic structure; and a P2 layer disposed in contact with the P1 layer and formed of a resin p2 containing an acrylic resin or an alicyclic structure-containing polymer. In the resin p1, the weight ratio of (the content of the polyphenylene ether)/(the content of the polystyrene-based polymer) is 35/65 to 45/55. A method for producing the phase difference film layered body and a method for producing a phase difference film using the phase difference film layered body are also provided.

Abstract: An organic EL display device including a substrate, a transparent electrode, a luminescent layer, and a metal electrode layer in this order from a light emission side, a circularly polarizing plate disposed on the light emission side of the substrate, the circularly polarizing plate including a polarizing film and phase difference films that stacked on each other. The phase difference film includes a resin composition (A) containing polystyrene-based polymer having a syndiotactic structure and polyarylene ether, a ratio of the polystyrene-based polymer having the syndiotactic structure with respect to the polyarylene ether in the resin composition (A) is 65:35 to 55:45, being a weight ratio of (the polystyrene-based polymer having the syndiotactic structure) with respect to (the polyarylene ether), the phase difference film satisfies a relation Re450<Re550<Re650, and an Nz coefficient of the phase difference film at a wavelength of 550 nm is ?0.25 to ?0.05.

Abstract: By provision of an A layer consisting of a resin having a positive intrinsic birefringence value; a B layer consisting of a resin containing a styrene polymer and having a negative intrinsic birefringence value; and a C layer consisting of a resin containing a polymer having an alicyclic structure, in this order; a phase difference film wherein, when the C layer is removed, retardation Re at an incident angle of 0° and retardation R40 at an incident angle of 40° satisfy a relationship of 0.92?R40/Re?1.08 is realized.

Abstract: A resin composition including a polyphenylene ether (A) and a copolymer (B) containing a repeating unit derived from a styrene compound and a repeating unit derived from maleic acid anhydride, wherein an amount of the repeating unit derived from maleic acid anhydride in the copolymer (B) is equal to or larger than 5% by weight and equal to or smaller than 20% by weight, and an amount of the polyphenylene ether (A) is equal to or more than 25 parts by weight and equal to or less than 35 parts by weight with respect to 100 parts by weight of the repeating unit derived from the styrene compound.

Abstract: An optical film includes: a layer A formed of a resin composition P1 containing a resin x1 having a positive intrinsic birefringence value and a resin y1 having a negative intrinsic birefringence value; and a layer B formed of a resin composition P2 containing a resin x2 having a positive intrinsic birefringence value and a resin y2 having a negative intrinsic birefringence value. In the optical film, retardations R450, R550, and R650 at an incident angle of 0° satisfy the relationship of R450<R550<R650, and retardation Re at an incident angle of 0° and retardation R40 at an incident angle of 40°. satisfy the relationship of 0.92?R40/Re?1.08. Also provided is a liquid crystal display device including the optical film.

Abstract: A step of forming a layered body including a resin layer (a) containing a resin A having positive intrinsic birefringence and a resin layer (b) containing a resin B having negative intrinsic birefringence, the resin layer (b) being provided on one side of the resin layer (a); a first stretching step of stretching the layered body in one direction at a temperature T1; and a second stretching step of, after the first stretching step, stretching the layered body in another direction that is approximately orthogonal to the previous stretching direction at a temperature T2 which is lower than the temperature T1 to obtain a phase difference plate are performed.

Abstract: The present invention is a lengthy-shaped polarizing plate comprising a linearly-polarized light separation element, a linear light polarizing film and a protection film in this order, wherein said linearly-polarized light separation element includes a layer composed of a resin A whose inherent birefringence value is negative and has a linearly-polarized light transmission axis in a crosswise direction.

Abstract: A retardation film composed of a laminated film which comprises a layer A composed of a material having a positive intrinsic birefringence and a layer B composed of a material having a negative intrinsic birefringence; the retardation film has a stretching temperature T? which causes delaying of a phase after the stretching to a phase before the stretching and a stretching temperature T? which causes hastening of a phase after the stretching to a phase before the stretching, in cases of uniaxially stretching in a direction of an X axis by draw ratio of 1.25, in which the phase is of linearly polarized light ?X in relation to linearly polarized light ?Y, the X axis is an uniaxially stretching direction; and the retardation film satisfies 0.92 ?R40/Re ?1.08, wherein Re (nm) and R40 (nm) are retardation values of light having a wavelength of 550 nm.

Abstract: A phase difference plate is manufactured by a method including a step of forming a multilayer body by co-extruding or co-casting a resin A having a positive intrinsic birefringence value and a resin B having a negative intrinsic birefringence value, the multilayer body including a layer “a” containing the resin A and a layer “b” containing the resin B; a step of stretching the multilayer body at a temperature T1 in one direction; and a step of subsequently stretching the multilayer body at temperature T2 lower than the temperature T1 in a direction that is approximately orthogonal to the previous stretching direction. The resulting phase difference plate has specific in-plane retardation Rea of the layer “a”, retardation Rta in the thickness direction thereof, in-plane retardation Reb of the layer “b”, and retardation Rtb in the thickness direction thereof.

Abstract: Provided are a polarization plate which has a high mechanical strength, which does not impair a visibility even under a high temperature and high humidity, which is excellent in flexibility and abrasion resistance, and which reduces a visible disturbance such as color unevenness due to a size change, as well as a liquid crystal display device using the polarization plate. A film composed of a plurality of layers composed mainly of thermoplastic resins is used as a first protection film used for a visible side of the polarization plate, and at least one surface layer of this first protection film is composed mainly of an acrylic resin. Furthermore, a second protection film having a specific property is disposed at a side of a liquid crystal cell.

Abstract: An optical film includes: a layer A formed of a resin composition P1 containing a resin x1 having a positive intrinsic birefringence value and a resin y1 having a negative intrinsic birefringence value; and a layer B formed of a resin composition P2 containing a resin x2 having a positive intrinsic birefringence value and a resin y2 having a negative intrinsic birefringence value. In the optical film, retardations R450, R550, and R650 at an incident angle of 0° satisfy the relationship of R450<R550<R650, and retardation Re at an incident angle of 0° and retardation R40 at an incident angle of 40°. satisfy the relationship of 0.92?R40/Re?1.08. Also provided is a liquid crystal display device including the optical film.

Abstract: A reflection preventing layered product is provided by laminating a high refractive index layer and a low refractive index layer, which has a refractive index lower than that of the high refractive index layer, in that order on a transparent plastic film, directly or through another layer. The low refractive index layer has a surface resistance of 1.0×1010 ohm/square inch or less, a total light remittance of 94% or more, and a refractive index of 1.25-1.37. An optical member provided with the reflection preventing layered product is also provided. This optical member is preferably a polarizing plate with reflection preventing function used for a liquid crystal display. The reflection preventing layered product excels in transparency, mechanical strength, antistaticity, and reflection preventing characteristics.

Abstract: The present invention is a lengthy-shaped polarizing plate comprising a linearly-polarized light separation element, a linear light polarizing film and a protection film in this order, wherein said linearly-polarized light separation element includes a layer composed of a resin A whose inherent birefringence value is negative and has a linearly-polarized light transmission axis in a crosswise direction.

Abstract: Provided are a polarization plate which has a high mechanical strength, which does not impair a visibility even under a high temperature and high humidity, which is excellent in flexibility and abrasion resistance, and which reduces a visible disturbance such as color unevenness due to a size change, as well as a liquid crystal display device using the polarization plate. A film composed of a plurality of layers composed mainly of thermoplastic resins is used as a first protection film used for a visible side of the polarization plate, and at least one surface layer of this first protection film is composed mainly of an acrylic resin. Furthermore, a second protection film having a specific property is disposed at a side of a liquid crystal cell.