JP2020064295A5 - - Google Patents

Claims (10)

A polarizing film having a thickness of 8 μm or less, a single transmittance of 44.5% or more, and a degree of polarization of 99.0% or more, and the polarized light, which is composed of a polyvinyl alcohol-based resin film containing a dichroic substance. A polarizing plate containing a protective layer on at least one side of the film, and a retardation layer having Re (550) of 100 nm to 190 nm and Re (450) / Re (550) of 0.8 or more and less than 1 . a method for producing a retardation layer-attached polarizing plate to have a,
A polyvinyl alcohol-based resin layer containing iodide or sodium chloride and a polyvinyl alcohol-based resin is formed on one side of a long thermoplastic resin base material to form a laminated body, and the laminated body is assisted in the air. It includes obtaining the polarizing film by performing a stretching treatment, a dyeing treatment, an underwater stretching treatment, and a drying shrinkage treatment of shrinking by 2% or more in the width direction by heating while transporting in the longitudinal direction in this order.
The angle formed by the slow axis of the retardation layer and the absorption axis of the polarizing film is 40 ° to 50 °.
A method for manufacturing a polarizing plate with a retardation layer. The method for producing a polarizing plate with a retardation layer according to claim 1 , wherein the protective layer is made of a triacetyl cellulose-based resin film. The method for manufacturing a polarizing plate with a retardation layer according to claim 1 or 2 , wherein the retardation layer is made of a polycarbonate resin film. The polarizing plate with a retardation layer according to any one of claims 1 to 3 , wherein the difference between the maximum value and the minimum value of the single transmittance in the region of 50 cm ² of the polarizing film is 0.2% or less. Manufacturing method . The invention according to any one of claims 1 to 4 , wherein the polarizing film has a width of 1000 mm or more, and the difference between the maximum value and the minimum value of the single transmittance at a position along the width direction is 0.3% or less. A method for manufacturing a polarizing plate with a retardation layer. The method for manufacturing a polarizing plate with a retardation layer according to any one of claims 1 to 5 , wherein the polarizing film has a single transmittance of 45.0% or less and a degree of polarization of 99.9% or less. The retardation layer-attached polarizing plate, a retardation layer-attached polarizing plate further have a different retardation layer on the outer side of the retardation layer,
Including providing the other retardation layer on the outside of the retardation layer.
The method for manufacturing a polarizing plate with a retardation layer according to any one of claims 1 to 6 , wherein the refractive index characteristic of the other retardation layer indicates a relationship of nz> nz = ny. The polarizing plate with a retardation layer is a polarizing plate with a retardation layer having a conductive layer or an isotropic substrate with a conductive layer on the outside of the retardation layer.
The method for manufacturing a polarizing plate with a retardation layer according to any one of claims 1 to 7, further comprising providing the conductive layer or an isotropic substrate with the conductive layer on the outside of the retardation layer. The polarizing plate with a retardation layer is long and has a long shape.
A long polarizing film having an absorption axis in the long direction and a long retardation layer which is a diagonally stretched film having a slow axis in a direction forming an angle of 40 ° to 50 ° with respect to the long direction. Including laminating with roll-to-roll ,
The method for manufacturing a polarizing plate with a retardation layer according to any one of claims 1 to 8 . The method for manufacturing a polarizing plate with a retardation layer according to claim 9 , which comprises winding the long-shaped polarizing plate with a retardation layer in a roll shape.