JP2014115405A5 - Polarizing laminate film, method of manufacturing polarizing plate, polarizing laminate film - Google Patents

Claims (8)

What is claimed is: 1. A method of producing a light-polarizing laminated film comprising a substrate film and two polarizer layers respectively formed on both sides of the substrate film,
Forming a first polyvinyl alcohol-based resin layer on one surface of the base film, and forming a second polyvinyl alcohol-based resin layer on the other surface to obtain a laminated film;
A stretching step of stretching the laminated film;
The first polyvinyl alcohol resin layer and the second polyvinyl alcohol resin layer of the laminated film after the stretching are brought into contact with a dyeing solution containing a dichroic dye and dyed with the dichroic dye to obtain two polarized lights And d) forming a child layer;
In the staining step, when the time for which the first polyvinyl alcohol resin layer is in contact with the staining solution is T1, and the time for the second polyvinyl alcohol resin layer is in contact with the staining solution is T2, the following formula:
Contact time difference ratio (%) = (T1−T2) / {(T1 + T2) / 2} × 100
The manufacturing method of a light-polarizing laminated film in which the ratio of the contact time difference calculated from the absolute value exceeds 4%.   The manufacturing method of the light-polarizing laminated film of Claim 1 whose ratio of the difference of the said contact time is 4.5% or more in absolute value. The dyeing step transports the laminated film in the dyeing solution while bringing the first polyvinyl alcohol resin layer and / or the second polyvinyl alcohol resin layer into contact with a guide roll.
Adjusting the time for which the first polyvinyl alcohol resin layer and the second polyvinyl alcohol resin layer are in contact with the guide roll, and the time T1 for the first polyvinyl alcohol resin layer to be in contact with the dyeing solution; The light-polarizing laminated film according to claim 1 or 2, wherein the second polyvinyl alcohol-based resin layer is adjusted for the time T2 of contacting the dyeing solution so that the ratio of the contact time difference becomes a desired numerical range. Production method.   The manufacturing method of the light-polarizing laminated film as described in any one of Claims 1-3 which has a bonding process of bonding a protective film on the surface of at least one said polarizer layer after the said dyeing process.   The manufacturing method of the light-polarizing laminated film of Claim 4 which bonds a protective film on the surface of the said two polarizer layers in the said bonding process. A method for producing a polarizing plate comprising a polarizer layer and a protective film,
The polarizing plate obtained by the manufacturing method according to claim 4 or 5 is used to peel off the laminate of the polarizer layer and the protective film in the polarizing laminate film from the base film to obtain a polarizing plate. The manufacturing method of a polarizing plate which has a peeling process to obtain. A substrate film, and two polarizer layers formed on both sides of the substrate film,
The light-polarizing laminated film in which the difference of the average value of the visibility correction single-piece | unit transmittance | permeability displayed by said 2 polarizer layers in% exceeds 0.3 point.   The light-polarizing laminated film according to claim 7, wherein the difference between the average values of the luminous transmittance correction single transmittances displayed in% units is 0.45 points or more.