Abstract: A method of producing a laminate according to an embodiment of the present invention includes applying an application liquid containing a polyvinyl alcohol-based resin to one side of a resin substrate, followed by drying of the application liquid to form a polyvinyl alcohol-based resin layer. The method includes: passing the application liquid before the application through a depth-type filter having a filtration accuracy of from 50 ?m to 100 ?m; and fluctuating a pressure applied to the application liquid supplied to the depth-type filter to remove air bubbles in the filter.

Abstract: A method of producing a laminate according to an embodiment of the present invention includes applying an application liquid containing a polyvinyl alcohol-based resin to one side of a resin substrate, followed by drying of the application liquid to form a polyvinyl alcohol-based resin layer. The method includes: passing the application liquid before the application through a depth-type filter having a filtration accuracy of from 50 ?m to 100 ?m; and fluctuating a pressure applied to the application liquid supplied to the depth-type filter to remove air bubbles in the filter.

Abstract: 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 films each comprise a lactone ring structure-containing (meth)acrylic resin, each one of the transparent protective films has a thickness T1 (?m) of 10 to 35 ?m, and the polarizer has a thickness T2 (?m) which satisfies that the ratio (T2/T1) of T2 to the thickness T1 of each one of the transparent protective films falls within the range of 0.8 to 1.8. The polarizing plate is designed to be thin and can satisfy durability.

Abstract: An end face of a polarization plate cut by laser becomes a substantially flat surface having only sloping micro waviness because of having been melted once to be solidified. Since the surface has few stress-concentrated parts that may cause microcracks, this prevents microcracks from easily being produced.

Abstract: A method for manufacturing a pressure-sensitive adhesive layer for use on an optical film, the method includes a filtration step including filtering a pressure-sensitive adhesive coating liquid under a differential pressure of more than 0 kPa and not more than 150 kPa using a depth type filter having a filtration accuracy of 1 to 20 ?m. The pressure-sensitive adhesive coating liquid contains an aqueous dispersion-type pressure-sensitive adhesive; and an application and drying step including applying the filtered pressure-sensitive adhesive coating liquid and then drying the coating liquid.

Abstract: Provided are a polarizer protective film containing a (meth)acrylic resin as a main component and being excellent in adhesion with a polarizer, a polarizing plate including the polarizer protective film and a polarizer which are unlikely to peel off from each other, and an image display apparatus of high quality using the polarizing plate. The polarizer protective film of the present invention includes a coating layer containing a (meth)acrylic resin (B) as a main component on at least one surface of a film containing a (meth)acrylic resin (A) as a main component.

Abstract: 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.

Abstract: An end face of a polarization plate 10 cut by laser according to the present invention becomes a substantially flat surface having only sloping micro waviness 16 because of having been melted once to be solidified. Since the surface has few stress-concentrated part that may cause microcracks, this prevents microcracks from easily being produced.

Abstract: Provided are an optical film which has high heat resistance, high transparency, and high mechanical strength, and has a sufficient retardation compensation function with a reverse wavelength dispersion characteristics, and a polarizing plate having such an optical film and a polarizer. Further, an image display apparatus of high quality using such a polarizing plate is provided. The optical film of the present invention includes a (meth)acrylic resin having a lactone ring as a main component, in which an in-plane retardation Re(450) at a wavelength of 450 nm/an in-plane retardation Re(600) at a wavelength of 600 nm is less than 1.0.

Abstract: 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.

Abstract: 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 films each comprise a lactone ring structure-containing (meth)acrylic resin, each one of the transparent protective films has a thickness T1 (?m) of 10 to 35 ?m, and the polarizer has a thickness T2 (?m) which satisfies that the ratio (T2/T1) of T2 to the thickness T1 of each one of the transparent protective films falls within the range of 0.8 to 1.8. The polarizing plate is designed to be thin and can satisfy durability.

Abstract: A method for manufacturing a polarizing plate in which a transparent protective film is provided on at least one surface of a polarizer with an adhesive layer interposed therebetween, wherein an adhesive is coated on a surface of the transparent protective film on which the adhesive layer is formed or/and a surface of the polarizer on which the adhesive layer is formed to form the adhesive layers, and thereafter, an aqueous liquid is caused to be present on an adhering surface when the transparent protective film and the polarizer are continuously adhered to each other with the adhesive layer interposed therebetween. A polarizing plate having uniform polarization characteristics, and excellent in durability is obtained by the method.

Abstract: 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.

Abstract: Provided are a polarizer protective film containing a (meth)acrylic resin as a main component and being excellent in adhesion with a polarizer, a polarizing plate including the polarizer protective film and a polarizer which are unlikely to peel off from each other, and an image display apparatus of high quality using the polarizing plate. The polarizer protective film of the present invention includes a coating layer containing a (meth) acrylic resin (B) as a main component on at least one surface of a film containing a (meth)acrylic resin (A) as a main component.

Abstract: Provided is a polarizer protective film, which has high heat resistance, high transparency, high optical characteristics, and high mechanical strength, and is excellent in adhesion with respect to a polarizer. Further, provided are a polarizing plate using the polarizer protective film and a polarizer, which has high adhesion with respect to the polarizer protective film and the polarizer and is excellent in optical characteristics, and in particular, excellent in transmittance as viewing angle characteristics, and an image display apparatus of high quality using the polarizing plate. The polarizer protective film of the present invention includes a cellulose-based resin layer having a thickness of 0.3 to 3 ?m on at least one surface of a transparent resin layer containing a (meth)acrylic resin having a lactone ring structure.

Abstract: Provided are: a polarizer protective film having excellent optical properties and mechanical strength, with the productivity and reworking property enhanced; a polarizing plate with less defects in an outer appearance, using a polarizer formed of the polarizer protective film and a polyvinyl alcohol-based resin; and an image display apparatus of high quality using the polarizing plate. The polarizer protective film of the present invention includes as a main component a (meth)acrylic resin, which is stretched by longitudinal stretching and/or lateral stretching.

Abstract: 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.

Abstract: The present invention is to provide: a polarizer protective film having an excellent UV absorbing ability, excellent heat resistance, and excellent optical transparency; a polarizing plate having less defects in an outer appearance using the polarizer protective film and a polarizer; and an image display apparatus of high quality using the polarizing plate. The polarizer protective film of the present invention includes as a main component a (meth) acrylic resin and a UV absorber, in which: a light transmittance at 380 nm of the polarizer protective film is 30% or less when the film has a thickness of 80 ?m; a difference between a Tg of the polarizer protective film and a Tg of the same film as the polarizer protective film except that it does not contain the UV absorber is within 3° C.; and YI at a thickness of 80 ?m is 1.3 or less.

Abstract: Provided are a polarizing plate which has no defects of unevenness and is excellent in optical characteristics as well as in external appearance, and an image display apparatus of high quality using such a polarizing plate. The polarizing plate of the present invention includes a polarizer and a protective layer (A) placed on at least one surface of the polarizer, in which the protective layer (A) is a (meth)acrylic resin layer having a thickness of 1 to 50 ?m with a surface hardness of B or more in terms of a pencil hardness, and an adhesive layer having a thickness of 50 to 150 nm is placed between the polarizer and the protective layer (A).

Abstract: Provided are an optical film which has high heat resistance, high transparency, and high mechanical strength, and has a sufficient retardation compensation function with a reverse wavelength dispersion characteristics, and a polarizing plate having such an optical film and a polarizer. Further, an image display apparatus of high quality using such a polarizing plate is provided. The optical film of the present invention includes a (meth) acrylic resin having a lactone ring as a main component, in which an in-plane retardation Re(450) at a wavelength of 450 nm/an in-plane retardation Re (600) at a wavelength of 600 nm is less than 1.0.