Method for producing polarizer
AssigneeNitto Denko Corporation
InventorsHiroaki Sawada, Takeharu Kitagawa, Takashi Kamijo
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Abstract
A method for producing a polarizer comprises the steps of: (A) stretching a polyvinyl alcohol-based resin layer to obtain a stretched layer; (B) immersing the stretched layer in a dyeing liquid containing iodine to obtain a dyed layer 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 so that the absorbance of the dyed layer decreases by 0.03 to 0.7, provided that the absorbance of the dyed layer is controlled so that it does not become less than 0.3.
Claims10
A method for producing a polarizer including a polyvinyl alcohol-based resin layer having a layer thickness of 0.6 μm to 5 μm, and containing iodine, the method comprising the steps of:
- (A) stretching a polyvinyl alcohol-based resin layer to obtain a stretched layer;
- (B) immersing the stretched layer in a dyeing liquid containing iodine to obtain a dyed layer 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 so that the absorbance of the dyed layer decreases by 0.03 to 0.7, provided that the absorbance of the dyed layer is controlled so that it does not become less than 0.3.
Dependencies are inferred from the claim text.