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US 8,559,105 B2Granted
Polarizing plate, optical film and image display
AssigneeNitto Denko Corporation
InventorsHiroyuki Yoshimi, Hiroaki Mizushima, Toshimasa Sugimura, Minoru Miyatake, Takeharu Kitagawa
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Abstract
A polarizing plate of the present invention includes a stretched laminate that is a laminate including a base material layer and a hydrophilic polymer layer and has undergone a stretching process, and at least a dichroic substance is adsorbed to the hydrophilic polymer layer. The polarizing plate of the present invention can be prevented from curling even when the polarizer is reduced in thickness.
Claims15
A polarizing plate, comprising:
- a laminate comprising
- a base material layer formed of a thermoplastic resin, and
- a hydrophilic polymer layer,
- wherein the laminate has undergone a stretching process, and
- at least a dichroic substance is adsorbed to the hydrophilic polymer layer,
- wherein the hydrophilic polymer layer of the stretched laminate has a thickness of 2 μm to 10 μm,
- wherein the base material layer of the stretched laminate has a thickness of 5 μm to 100 μm and has a water-vapor permeability of 120 g/m2/24 h or less, and
- wherein the hydrophilic polymer layer of the stretched laminate functions as a polarizer and the base material layer is used as a transparent protective film for the polarizer.
5 more elements
A method for manufacturing a polarizing plate, comprising:
- a step comprising applying a hydrophilic polymer-containing solution to a base material layer form of a thermoplastic resin and then drying the hydrophilic polymer-containing solution to form a hydrophilic polymer layer on the base material layer, so that a laminate comprising the base material layer and the hydrophilic polymer layer is obtained;
- a stretching step comprising stretching the laminate to form a stretched laminate;
- and
- a dyeing step comprising adsorbing a dichroic substance to the hydrophilic polymer layer of the laminate or the stretched laminate, wherein
- the stretching in stretching step is performed so that the hydrophilic polymer layer of the stretched laminate has a thickness of 2 μm to 10 μm, and
- the base material layer of the stretched laminate has a thickness of 5 μm to 100 μm and has a water-vapor permeability of 120 g/m2/24 h or less.
3 more elements
A method for manufacturing a polarizing plate, comprising:
- a step comprising co-extruding a base material layer-forming material and a hydrophilic polymer layer-forming material to form a laminate comprising a base material layer formed of a thermoplastic resin and a hydrophilic polymer layer;
- a stretching step comprising stretching the laminate to form a stretched laminate;
- and
- a dyeing step comprising adsorbing a dichroic substance to the hydrophilic polymer layer of the laminate or the stretched laminate, wherein
- the stretching in stretching step is performed so that the hydrophilic polymer layer of the stretched laminate has a thickness of 2 μm to 10 μm, and
- the base material layer of the stretched laminate has a thickness of 5 μm to 100 μm and has a water-vapor permeability of 120 g/m2/24 h or less.
3 more elements
Dependencies are inferred from the claim text.