JP2018028696A5 - - Google Patents

Claims (11)

A polarizing plate in which first and second transparent protective films are bonded to both surfaces of a polarizer via an adhesive layer formed by irradiating an active energy ray-curable adhesive with active energy rays. ,
At least the first transparent protective film is a plasticizer unevenly distributed cellulose ester film comprising a plasticizer and a cellulose ester, and wherein the plasticizer is unevenly distributed on one surface,
The polarizing plate characterized in that the plasticizer is unevenly distributed in the plasticizer unevenly-distributed cellulose ester film, and the surface side where the plasticizer is unevenly distributed is bonded via the adhesive layer. The plasticizer unevenly distributed cellulose ester film has a thickness of 1 μm or more, and
In the plasticizer unevenly distributed cellulose ester film, the proportion (a) of the plasticizer in the range from the surface side where the plasticizer is unevenly distributed to the thickness of 5 nm is plastic in the range from the surface side where the plasticizer is not unevenly distributed to 5 nm. The polarizing plate according to claim 1, wherein the polarizing plate is larger than the ratio (b) of the agent. The polarizing plate according to claim 2, wherein the plasticizer contained in the plasticizer unevenly distributed cellulose ester film contains a phosphorus plasticizer.   The polarizing plate according to claim 3, wherein the proportion (a) of the phosphorus plasticizer based on phosphorus atoms in the phosphorus plasticizer is 0.5 to 3 atomic%.   The plasticizer unevenly distributed cellulose ester film has nx> ny> nz (where the in-plane refractive index has the maximum X-axis direction, the direction perpendicular to the X-axis has the Y-axis, and the thickness direction has the Z-axis, The polarizing plate according to any one of claims 1 to 4, wherein the polarizing plate satisfies a relationship of nx, ny, and nz in the axial refractive index. The second transparent protective film, a polarizing plate according to any one of claims 1 to 5, wherein the moisture permeability is not more than 120g / m 2 / ^24h.   The polarizing plate according to claim 1, wherein the second transparent protective film contains a (meth) acrylic resin, a cyclic polyolefin resin, or a polyester resin.   The polarizing plate according to claim 1, wherein the active energy ray curable adhesive is a radical curable active energy ray curable adhesive containing a radical polymerizable compound. The polarizing plate according to any one of claims 1 to 8, wherein the plasticizer unevenly distributed cellulose ester film has no plasticizer on the surface side where the plasticizer is not unevenly distributed. An optical film in which at least one polarizing plate according to claim 1 is laminated. An image display device, wherein a used optical film of the polarizing plate or claim 10, wherein according to any one of claims 1 to 9.