Method for producing polarizer
AssigneeNitto Denko Corporation
InventorsHiroaki Sawada, Takeharu Kitagawa, Takashi Kamijo
Life of this patent
Estimating the term…
Abstract
A method for producing a polarizer (20) comprises the steps of: (A) stretching a polyvinyl alcohol-based resin layer (10) to obtain a stretched layer (14); (B) immersing the stretched layer (14) in a dyeing liquid (23) containing iodine to obtain a dyed layer (18) in which absorbance thereof determined from a tristimulus value Y is from 0.4 to 1.0 (transmittance T=40% to 10%); and (C) removing a part of iodine adsorbed in the dyed layer (18) so that the absorbance of the dyed layer (18) decreases by 0.03 to 0.7, provided that the absorbance of the dyed layer (18) is controlled so that it does not become less than 0.3.
Claims6
A polarizer comprising a stretched layer of polyvinyl alcohol-based resin including iodine adsorbed therein;
- wherein said layer of polyvinyl alcohol-based resin has a thickness of 0.4 to 7 μm and includes polymer chains oriented substantially in one direction, said polymer chain including a highly oriented crystallized portion, and said layer of polyvinyl alcohol-based resin surrounding the crystallized portion is amorphous;
- and
- wherein said iodine adsorbed in said layer of polyvinyl alcohol-based resin is present in said layer of polyvinyl alcohol-based resin in the form of polyiodine ion complex adsorbed to the crystallized portion of said layer of polyvinyl alcohol-based resin to provide the polarizer with a dichroic property, whereby the polarizer exhibits an absorbance of 0.359 to 0.380 and a polarization degree of 99.9% or higher, and the absorbance is determined based on a Y value of an XYZ colorimetric system as defined by JIS Z 8701.
A polarizer comprising a stretched layer of polyvinyl alcohol-based resin including iodine adsorbed therein;
- wherein said layer of polyvinyl alcohol-based resin has a thickness of 0.4 to 7 μm and includes polymer chains oriented substantially in one direction, said polymer chain including a highly oriented crystallized portion said layer of polyvinyl alcohol-based resin surrounding the crystallized portion is amorphous;
- and
- wherein said iodine adsorbed in said layer of polyvinyl alcohol-based resin is present in said layer of polyvinyl alcohol-based resin in the form of polyiodine ion complex adsorbed to the crystallized portion of said layer of polyvinyl alcohol-based resin to provide the polarizer with a dichroic property, whereby the polarizer exhibits an absorbance of 0.377 or less and a polarization degree of 99.95% or higher, and the absorbance is determined based on a Y value of an XYZ colorimetric system as defined by JIS Z 8701.
Dependencies are inferred from the claim text.