CN106199809B - Laminated film and method for producing laminated film - Google Patents
Laminated film and method for producing laminated film Download PDFInfo
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- CN106199809B CN106199809B CN201610364033.3A CN201610364033A CN106199809B CN 106199809 B CN106199809 B CN 106199809B CN 201610364033 A CN201610364033 A CN 201610364033A CN 106199809 B CN106199809 B CN 106199809B
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Links
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Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B43/00—Operations specially adapted for layered products and not otherwise provided for, e.g. repairing; Apparatus therefor
- B32B43/006—Delaminating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B2038/0052—Other operations not otherwise provided for
- B32B2038/0088—Expanding, swelling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/42—Polarizing, birefringent, filtering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2329/00—Polyvinylalcohols, polyvinylethers, polyvinylaldehydes, polyvinylketones or polyvinylketals
- B32B2329/04—Polyvinylalcohol
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Polarising Elements (AREA)
- Laminated Bodies (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The present invention relates to a laminated film and a method for producing the laminated film. There is a problem that uneven dyeing occurs in the width direction due to wrinkles and slackness, and both ends in the width direction cannot be used for the polarizing plate. In addition, when wrinkles or slacks occur in the polarizing laminated film obtained after the dyeing step, there is a problem that the protective film cannot be attached and the polarizing plate cannot be stably manufactured. The solution of the present invention is a laminated film having a substantially unstretched polyvinyl alcohol resin layer on at least one surface of a long base film, wherein when the polyvinyl alcohol resin layer is equally divided into 9 regions in the width direction, the average film thickness D1e in the outermost region and the average film thickness D1c in the central region satisfy the following formula. D1 e-D1 c is less than or equal to-0.3 mu m.
Description
Technical Field
The present invention relates to a laminated film and a method for producing the laminated film.
Background
Conventional polarizers are produced by stretching and dyeing a base film (japanese: pristine フィルム) (usually, about 30 to 75 μm in thickness) of a polyvinyl alcohol resin, and the stretched film usually has a thickness of about 12 to 30 μm. When a green film of a polyvinyl alcohol resin having a thickness of 30 μm or less is used for the purpose of making a film thinner, there is a problem of productivity such that the film is easily broken when stretched.
Therefore, in order to cope with recent thinning of the polarizing plate, a method of coating an aqueous solution containing a polyvinyl alcohol resin on a base film has been proposed. In this embodiment, a polyvinyl alcohol resin layer is formed by applying an aqueous solution containing a polyvinyl alcohol resin to a base film, and after a laminated film is obtained, the laminated film is subjected to stretching and dyeing treatment, thereby imparting a polarizing function to the polyvinyl alcohol resin layer to obtain a polarizer layer (patent document 1).
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2009-098653
Disclosure of Invention
Problems to be solved by the invention
When the polarizing laminated film is obtained by coating an aqueous solution containing a polyvinyl alcohol resin, the polarizing laminated film can be generally produced by a roll-to-roll (roll) method using a long base film. In this method, since the method includes a plurality of steps such as a step of stretching the polyvinyl alcohol resin layer and a step of dyeing with iodine, a long film may be wound in a roll shape in each step.
In particular, when a stretched laminated film roll is obtained by winding a stretched laminated film into a roll after a stretching step and a stretched laminated film is obtained by unwinding (unwinding) the stretched laminated film roll in order to perform a dyeing step, wrinkles and slackening may occur at both ends in the width direction of a long film obtained by unwinding. Wrinkles and slackening occurring at both ends of a film obtained by winding the film into a roll form and then unwinding the film occur similarly in a laminated film, and there is a problem as follows: the wrinkles and slackening cause uneven dyeing in the width direction, and both ends in the width direction cannot be used for the polarizing plate. In addition, there are the following problems: when wrinkles or slacks occur in the polarizing laminated film obtained after the dyeing step, the protective film cannot be bonded, and the polarizing plate cannot be stably manufactured.
Means for solving the problems
The present invention includes the following aspects.
[1] A laminated film having a substantially unstretched polyvinyl alcohol resin layer on at least one surface of a long base film, wherein when the polyvinyl alcohol resin layer is equally divided into 9 regions in the width direction, the average film thickness D1e in the outermost region and the average film thickness D1c in the central region satisfy the following formula.
D1e－D1c≤－0.3μm
The average film thickness D1e in the outermost region is the average film thickness that is significantly different from the average film thickness D1c in the central region among the average film thicknesses in the outermost 2 regions.
[2] The laminated film according to item [1], wherein an average value of a thickness of the substantially unstretched polyvinyl alcohol resin layer in a width direction is 10 μm or less.
[3] A stretched laminate film comprising a stretched polyvinyl alcohol resin layer on at least one surface of a long base film, wherein when the stretched polyvinyl alcohol resin layer is divided into 9 regions in the width direction, the average film thickness D2e in the outermost region and the average film thickness D2c in the central region satisfy the following equation.
D2e－D2c≤0.25μm
The average film thickness D2e in the outermost region is the average film thickness that is significantly different from the average film thickness D2c in the central region among the average film thicknesses in the outermost 2 regions.
[4] The stretched laminate film according to item [3], wherein the average value of the thickness of the stretched polyvinyl alcohol resin layer in the width direction is 7 μm or less.
[5] The stretched laminate film according to item [3] or [4], wherein when the base film is equally divided into 9 regions in the width direction, the average film thickness D3e in the outermost region and the average film thickness D3c in the central region satisfy the following equation.
D3e－D3c≤1.0μm
The average film thickness D3e in the outermost region is the average film thickness that is significantly different from the average film thickness D3c in the central region among the average film thicknesses in the outermost 2 regions.
[6] The stretched laminate film according to any one of the items [3] to [5], wherein when the stretched laminate film is equally divided into 9 regions in the width direction, the average film thickness D4e in the outermost region and the average film thickness D4c in the central region satisfy the following expression.
D4e－D4c≤1.5μm
The average film thickness D4e in the outermost region is the average film thickness that is significantly different from the average film thickness D4c in the central region among the average film thicknesses in the outermost 2 regions.
[7] A polarizing laminated film comprising a long base film and a polarizer layer on at least one surface of the base film, wherein the average film thickness D5e in the outermost region and the average film thickness D5c in the central region satisfy the following equation when the polarizer layer is equally divided into 9 regions in the width direction.
D5e－D5c≤0.25μm
The average film thickness D5e in the outermost region is the average film thickness that is significantly different from the average film thickness D5c in the central region among the average film thicknesses in the outermost 2 regions.
[8] The polarizing laminate film according to item [7], wherein an average value of thicknesses of the polarizer layers in a width direction is 7 μm or less.
[9] The polarizing laminated film according to item [7] or [8], wherein when the substrate film is equally divided into 9 regions in the width direction, the average film thickness D6e in the outermost region and the average film thickness D6c in the central region satisfy the following formula.
D6e－D6c≤1.0μm
The average film thickness D6e in the outermost region is the average film thickness that is significantly different from the average film thickness D6c in the central region among the average film thicknesses in the outermost 2 regions.
[10] The polarizing laminated film according to any one of items [7] to [9], wherein when the polarizing laminated film is equally divided into 9 regions in the width direction, the average film thickness D7e in the outermost region and the average film thickness D7c in the central region satisfy the following equation.
D7e－D7c≤1.5μm
The average film thickness D7e in the outermost region is the average film thickness that is significantly different from the average film thickness D7c in the central region among the average film thicknesses in the outermost 2 regions.
[11] The polarizing laminate film according to any one of items [7] to [10], wherein a visibility correction (i.e., a degree of viewing sensitivity correction) individual transmittance ty measured at a position 25mm from an edge of the polarizer layer in the width direction and a visibility correction individual transmittance Tyc measured at the center of the polarizer layer in the width direction satisfy the following equation.
|Tye－Tyc|≤0.40％
The visibility correction cell transmittance ty measured at a position 25mm from the edge is the one of the 2 measured values which is greatly different from the visibility correction cell transmittance Tyc measured at the center.
[12] A method for producing a laminated film, comprising the steps of:
a step of applying an aqueous solution containing a polyvinyl alcohol resin to at least one surface of a long base film so that a central portion of the coating layer in a width direction is thicker than both end portions thereof to form a coating layer; and
and drying the coating layer to form a resin layer made of a polyvinyl alcohol resin.
[13] A method for producing a stretched laminate film, comprising: a step of uniaxially stretching the laminated film according to item [12] by more than 5 times to obtain a stretched laminated film.
[14] A method of manufacturing a roll of stretch laminate film, comprising: a step of winding the stretched laminate film according to the item [13] into a roll to obtain a stretched laminate film roll.
[15] A method for producing a polarizing laminated film, comprising: dyeing the stretched laminated film according to item [13] or the stretched laminated film obtained by unwinding the stretched laminated film roll according to item [14], to obtain a polarizing laminated film.
[16] A method for manufacturing a polarizing plate, comprising the steps of:
a bonding step of bonding a protective film to a surface of the polarizing laminated film according to item [15], the surface being opposite to the base film side, of the polarizer layer to obtain a multilayer film; and
and a peeling step of peeling the base film from the multilayer film.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, wrinkles and slacks are less likely to occur at both ends in the width direction of a long laminated film, and the area of a portion that cannot be a product can be reduced. In addition, a polarizing plate having uniform optical characteristics in the width direction can be obtained. In addition, since the protective film can be easily attached to the polarizing laminate film, the polarizing plate can be stably manufactured.
Drawings
Fig. 1 is a diagram illustrating a method for producing a laminated film according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view showing an example of a substrate film having a coating layer obtained by one embodiment of the present invention.
Fig. 3 is a schematic cross-sectional view showing an example of a laminated film obtained according to an embodiment of the present invention.
Fig. 4 is a schematic cross-sectional view showing an example of a stretched laminate film obtained according to an embodiment of the present invention.
Fig. 5 is a schematic cross-sectional view showing an example of a polarizing laminated film obtained by one embodiment of the present invention.
Fig. 6 is a schematic cross-sectional view showing the positions of the outermost region and the central region of the coating layer obtained in one embodiment of the present invention.
FIG. 7 is a schematic cross-sectional view of a stretched laminated film in the case where the stretched polyvinyl alcohol resin layer does not satisfy the requirements of the present invention.
Description of the reference numerals
1 film of substrate
2 coating layer
3 polyvinyl alcohol resin layer
4 stretched polyvinyl alcohol resin layer
5 polarizer layer
9 substrate film having coating layer
10 laminated film
11 stretch laminate film
12-polarization laminated film
30. 32, 34 decoiling part
42 surface activation means
44 coating means
46 drying means
48 coating means
50 means for drying
52 drive roller
31. 33, 35 winding part
100 outermost region
101 central region
Detailed Description
When the polarizer layer is obtained by coating an aqueous solution containing a polyvinyl alcohol resin, the polarizing laminated film can be generally produced by a method including the following steps.
(coating step) an aqueous solution containing a polyvinyl alcohol resin is applied to at least one surface of a long base film to obtain a coating layer.
(drying step) the coating layer is dried to form a polyvinyl alcohol resin layer (which may be simply referred to as a resin layer) and thereby obtain a laminated film.
(stretching step) the laminated film is stretched to obtain a stretched laminated film.
(dyeing step) the stretched laminated film is immersed in a dyeing solution containing iodine to obtain a polarizing laminated film.
The inventors have found that, in order to suppress wrinkles and slacks from occurring at both ends in the width direction of the polarizing laminated film, the following intermediate products may be produced in each step of producing a polarizing plate. The length of the intermediate product (the laminated film, the stretched laminated film, and the polarizing laminated film) of the present invention in the longitudinal direction may be 100m or more, or may be 500m or more. When the length of the film is 100m or more, the winding diameter is increased, and therefore, the wind-up is generally likely to occur (japanese: coil き まり), but the present invention can effectively prevent the wrinkles and slacks from occurring at both ends in the width direction. The length of the film is usually 10000m or less.
[ intermediate product: laminated film
In the laminate film having the polyvinyl alcohol resin layer on the long base film, when the polyvinyl alcohol resin layer is equally divided into 9 regions in the width direction, it is important that the average film thickness D1e in the outermost region and the average film thickness D1c in the central region satisfy the following formula (1-1), and more preferably satisfy the formula (1-2). D1 e-D1 c are preferably-0.4 μm or less, more preferably-1.5 μm or more, and still more preferably-1.3 μm or more. The average film thickness D1e in the outermost region is the average film thickness that is significantly different from the average film thickness D1c in the central region among the average film thicknesses in the outermost 2 regions.
D1e－D1c≤－0.3μm (1－1)
D1e－D1c≥－2.0μm (1－2)
When the laminate film has a polyvinyl alcohol resin layer on both surfaces of the base film, the polyvinyl alcohol resin layer disposed on at least one surface of the base film may satisfy formula (1-1), and preferably, any polyvinyl alcohol resin layer disposed on the surface of the base film satisfies formula (1-1).
It is considered that D1 e-D1 c in the film thickness distribution in the width direction of the polyvinyl alcohol resin layer show the uniformity of the film thickness distribution and the outline of the film thickness distribution in the width direction. The polyvinyl alcohol resin layer satisfies the expression (1-1), and the polyvinyl alcohol resin layer having a convex film thickness distribution in the width direction is disposed on the substrate film. By making the film thickness distribution in the width direction convex in this manner, it is considered that when the laminated film is wound in a roll shape while applying a tension in the winding direction (MD direction) to obtain a laminated film roll, the tension applied to the end in the width direction of the laminated film roll can be reduced as compared with the case where the film thickness distribution in the width direction is concave. As a result, the occurrence of the wind-up is less likely to occur at both widthwise ends of the laminated film roll, and the occurrence of wrinkles and slackening at both widthwise ends of the laminated film obtained by the wind-off can be suppressed.
Although wrinkles and slacks may occur in the central portion in the width direction of the laminated film obtained by unwinding the laminated film from the roll, the wrinkles and slacks in the central portion in the width direction can be eliminated by a stretching step which is a subsequent step. On the other hand, it is difficult to eliminate wrinkles and slacks generated at both ends in the width direction by the stretching step. The polyvinyl alcohol resin layer preferably satisfies the formula (1-2) in view of easily removing wrinkles and sagging in the center portion in the width direction.
Since the laminated film is a film before the stretching step and the dyeing step are performed, the polyvinyl alcohol resin layer is a substantially unstretched layer. The substantially unstretched state means that the stretching magnification in the stretching direction is 0.99 to 1.01 times.
In the present specification, the width direction refers to a direction perpendicular to the longitudinal direction of the long laminated film and parallel to the laminated film surface. When the laminated film is produced by a roll-to-roll method, the width direction coincides with a direction (TD direction) perpendicular to the conveyance direction (MD direction) of the laminated film and parallel to the laminated film surface. Of course, the longitudinal direction coincides with the MD direction. In addition, when the multilayer film of the present invention is subjected to a longitudinal stretching step to obtain a stretched multilayer film, and further subjected to a step including a dyeing step to obtain a polarizing multilayer film, the stretching direction is generally aligned with the longitudinal direction of the multilayer film, and the absorption axis direction of the polarizing multilayer film is aligned with the longitudinal direction of the multilayer film. The same applies to a polarizing plate obtained by laminating a transparent protective film on a polarizing laminate film and peeling off a base film, and also to a sheet-like body obtained by cutting the polarizing plate into a predetermined size.
For example, the laminated film of the present invention has a convex film thickness distribution in the width direction as shown in fig. 3.
[ intermediate product: stretching of laminated film
The stretched laminated film has a stretched polyvinyl alcohol resin layer on at least one surface of a long base film. The stretched laminated film is a film which can also be obtained by stretching the above laminated film. The stretching ratio of the polyvinyl alcohol resin layer may be, for example, 5 to 17 times, or 5 to 8 times. When the stretched polyvinyl alcohol resin layer is divided into 9 regions in the width direction, it is important that the average film thickness D2e in the outermost region and the average film thickness D2c in the central region satisfy the following formula (2-1), and more preferably satisfy the formula (2-2). D2 e-D2 c are preferably 0.20 μm or less, more preferably 0.15 μm or less, and further preferably-1.0 μm or more. The average film thickness D2e in the outermost region is an average film thickness that is significantly different from the average film thickness D2c in the central region among the average film thicknesses in the outermost 2 regions.
D2e－D2c≤0.25μm (2－1)
D2e－D2c≥－1.2μm (2－2)
When the stretched polyvinyl alcohol resin layers are provided on both surfaces of the base film, the polyvinyl alcohol resin layer disposed on at least one surface of the base film may satisfy formula (2-1), and preferably, any of the polyvinyl alcohol resin layers disposed on the surfaces of the base film satisfies formula (2-1).
When the stretched polyvinyl alcohol-based resin layer satisfies the formula (2-1), it is considered that, when the stretched laminated film is wound to form a stretched laminated film roll, the both ends in the width direction are less likely to be wound up for the same reason as the above-described laminated film, and the both ends in the width direction are inhibited from being wrinkled or loosened.
In view of more effectively suppressing the wind-up of the roll of the stretched laminated film, when the base film is equally divided into 9 regions in the width direction in the stretched laminated film, the average film thickness D3e in the outermost region and the average film thickness D3c in the central region preferably satisfy the following formula (3-1), and more preferably satisfy the formula (3-2). D3 e-D3 c are preferably 0.8 μm or less, and-0.8 μm or more. The average film thickness D3e in the outermost region is the average film thickness that is significantly different from the average film thickness D3c in the central region among the average film thicknesses in the outermost 2 regions.
D3e－D3c≤1.0μm (3－1)
D3e－D3c≥－1.0μm (3－2)
Preferably, the polyvinyl alcohol resin layer and the base film are integrally stretched. In this case, the film thickness distribution in the width direction of the base film may reflect the tendency of the film thickness distribution of the stretched polyvinyl alcohol resin layer. That is, not only the polyvinyl alcohol resin layer but also the film thickness distribution in the width direction of the base film may vary. Therefore, when the film thickness distribution in the width direction of the stretched polyvinyl alcohol resin layer does not satisfy the formula (2-1), for example, as shown in fig. 7, when the stretched polyvinyl alcohol resin layer has a concave film thickness distribution (D2 e-D2 c > 0.25 μm), the film thickness distribution in the width direction of the substrate film may be deformed into a concave shape by stretching (D3 e-D3 c > 1.0 μm). On the other hand, in the stretched laminated film of the present invention, the film thickness distribution in the width direction of the stretched polyvinyl alcohol resin layer satisfies the formula (2-1), and is nearly smooth, so that deformation of the base material film can be suppressed.
In addition, in the case where the stretched laminate film is equally divided into 9 regions in the width direction, the average film thickness D4e in the outermost region and the average film thickness D4c in the central region preferably satisfy the following formula (4-1), and more preferably satisfy the formula (4-2). D4 e-D4 c are preferably-1.0 μm or more, more preferably 0.0 μm or more, and may be 0.5 μm or more. The average film thickness D4e in the outermost region is the average film thickness that is significantly different from the average film thickness D4c in the central region among the average film thicknesses in the outermost 2 regions.
D4e－D4c≤1.5μm (4－1)
D4e－D4c≥－2.0μm(4－2)
The thickness of the stretched laminated film means the total thickness, and is the sum of the thickness of the base film and the thickness of the stretched resin layer in the stretched laminated film. When the substrate film has a polyvinyl alcohol resin layer on one surface thereof, the total thickness is the sum of the thickness of the substrate film and the thickness of the polyvinyl alcohol resin layer, and when the substrate film has polyvinyl alcohol resin layers on both surfaces thereof, the total thickness is the sum of the thickness of the substrate film and the thickness of the pair of polyvinyl alcohol resin layers. Therefore, when the polyvinyl alcohol resin layers are provided on both surfaces of the base film and the formula (4-1) is satisfied, wrinkles and slackening at both ends in the width direction can be more effectively suppressed in the stretched laminated film roll.
As described above, when the laminate film satisfies the formula (1-1), the cross-sectional shape in the width direction is convex. The value of the formula (2-1) is larger than the value of the formula (1-1), and this is considered to be because the end portion of the laminated film having a small film thickness is thickened by the inward bending (tack in) at the time of stretching, and the cross-sectional shape in the width direction changes from a convex shape to a planar shape.
For example, the stretched laminated film of the present invention has a film thickness distribution in the width direction as shown in fig. 4.
[ intermediate product: polarizing laminate film
The polarizing laminated film has a polarizer layer on at least one surface of a long base film. The polarizing laminated film is a film that can be obtained by subjecting the stretched laminated film to a step including a dyeing step. The polyvinyl alcohol resin layer becomes a polarizer layer by the process including the dyeing step. In general, the film thickness distribution in the width direction of each layer (polarizer layer, base film) of the polarizing laminated film reflects the film thickness distribution in the width direction of each layer of the stretched laminated film.
Therefore, when the polarizer layer is equally divided into 9 regions in the width direction as in the case of the stretched laminate film, it is important that the average film thickness D5e in the outermost region and the average film thickness D5c in the central region satisfy the following formula (5-1), and more preferably satisfy the formula (5-2). D5 e-D5 c are preferably 0.20 μm or less, more preferably 0.15 μm or less, still more preferably 0.1 μm or less, and furthermore preferably-0.15 μm or more, more preferably-0.1 μm or more. The average film thickness D5e in the outermost region is the average film thickness that is significantly different from the average film thickness D5c in the central region among the average film thicknesses in the outermost 2 regions.
D5e－D5c≤0.25μm (5－1)
D5e－D5c≥－0.2μm (5－2)
When the polarizing laminated film has polarizer layers on both surfaces of the base film, the polarizer layer disposed on at least one surface of the base film may satisfy formula (5-1), and preferably, any polarizer layer disposed on the surface of the base film satisfies formula (5-1).
When the polarizer layer satisfies the formula (5-1) in the width direction, it is considered that when the polarizing laminated film is wound to form a polarizing laminated film roll, both ends in the width direction are less likely to be wound up, and wrinkles and slacks at both ends in the width direction can be suppressed.
In view of more effectively suppressing the wind-up of the polarizing laminated film roll, when the substrate film is equally divided into 9 regions in the width direction in the polarizing laminated film, the average film thickness D6e in the outermost region and the average film thickness D6c in the central region preferably satisfy the following formula (6-1), and more preferably satisfy the formula (6-2). D6 e-D6 c are more preferably 0.9 μm or less, still more preferably-1.0 μm or more, still more preferably-0.8 μm or more. The average film thickness D6e in the outermost region is the average film thickness that is significantly different from the average film thickness D6c in the central region among the average film thicknesses in the outermost 2 regions.
D6e－D6c≤1.0μm (6－1)
D6e－D6c≥－1.5μm (6－2)
In addition, in the polarizing laminated film, when the polarizing laminated film is equally divided into 9 regions in the width direction, the average film thickness D7e in the outermost region and the average film thickness D7c in the central region preferably satisfy the following formula (7-1), and more preferably satisfy the formula (7-2). D7 e-D7 c are preferably 1.3 μm or less, more preferably-1.0 μm or more, and still more preferably 0 μm or more. The average film thickness D7e in the outermost region is the average film thickness that is significantly different from the average film thickness D7c in the central region among the average film thicknesses in the outermost 2 regions.
D7e－D7c≤1.5μm (7－1)
D7e－D7c≥－2.0μm (7－2)
The thickness of the polarizing laminated film is the total thickness, and is the sum of the thickness of the base film and the thickness of the polarizer layer in the polarizing laminated film. When a polarizer layer is provided on one side of the substrate film, the total thickness is the sum of the thickness of the substrate film and the thickness of the polarizer layer, and when polarizer layers are provided on both sides of the substrate film, the total thickness is the sum of the thickness of the substrate film and the thickness of the pair of polarizer layers. Therefore, when the base film has the polarizer layers on both surfaces thereof and satisfies the formula (7-1), wrinkles and slacks at both ends in the width direction can be more effectively suppressed in the polarizing laminated film roll.
In addition, from the viewpoint of obtaining a polarizing plate with more uniform polarizing performance, the visibility-correcting individual transmittance ty measured at a position 25mm from the edge in the width direction of the polarizer layer and the visibility-correcting individual transmittance Tyc measured at the center in the width direction preferably satisfy the following formula (8-1). The value of type-Tyc is preferably 0.3% or less, and more preferably 0.2% or less. The value of type-Tyc is usually 0.00% or more. The visibility-correcting cell transmittance ty measured at a position 25mm from the edge is the one of the 2 measured values which is significantly different from the visibility-correcting cell transmittance Tyc measured at the center.
|Tye－Tyc|≤0.40％ (8－1)
The visibility correction monomer transmittance (Ty) can be found by: the transmittance (T) in the MD direction of the polarizing laminated film was determined in the wavelength range of 380nm to 780nmMD) Transmittance (T) in the TD directionTD) Based on the followingThe monomer transmittance at each wavelength was calculated by the formula (9), and the resultant was subjected to visibility correction with a 2-degree field of view (C light source) according to JIS Z8701.
Monomer transmittance (%) ═ (T)MD+TTD)/2 (9)
For example, the polarizing laminated film of the present invention has a film thickness distribution in the width direction as shown in fig. 5.
Hereinafter, an embodiment of a method for producing a laminated film, a method for producing a polarizing laminated film, and a method for producing a polarizing plate according to the present invention will be described with reference to the drawings.
(method for producing laminated film)
Fig. 1 is a flowchart illustrating a method for manufacturing a laminated film according to an embodiment of the present invention.
(substrate film)
First, a long substrate film 1 is prepared. The base film 1 may be formed of a thermoplastic resin. Examples of the thermoplastic resin include polyolefin resins such as chain polyolefin resins and cyclic polyolefin resins (norbornene resins, etc.); polyester resins such as polyethylene terephthalate; (meth) acrylic resins; cellulose ester resins such as cellulose triacetate and cellulose diacetate; a polycarbonate-based resin; a polyvinyl alcohol resin; polyvinyl acetate resin, polyarylate resin; a polystyrene-based resin; a polyether sulfone-based resin; a polysulfone-based resin; a polyamide resin; a polyimide resin.
The substrate film may have a single-layer structure including 1 resin layer formed of 1 or 2 or more thermoplastic resins, or may have a multilayer structure in which a plurality of resin layers formed of 1 or 2 or more thermoplastic resins are stacked.
The substrate film may be a stretched product or an unstretched product. In the case of a stretched product, the stretching may be uniaxial stretching or biaxial stretching.
Examples of the chain polyolefin resin include homopolymers of chain olefins such as polyethylene resins and polypropylene resins, and copolymers of 2 or more kinds of chain olefins. A substrate film made of a chain polyolefin resin is preferable in terms of ease of stable stretching to a high magnification. Among them, the base film is more preferably formed of a polypropylene resin (such as a polypropylene resin which is a homopolymer of propylene, a copolymer mainly composed of propylene), a polyethylene resin (such as a polyethylene resin which is a homopolymer of ethylene, a copolymer mainly composed of ethylene), or the like.
Examples of the other monomer copolymerizable with propylene include ethylene and α -olefin, α -olefin is preferably α -olefin having 4 or more carbon atoms, more preferably α -olefin having 4 to 10 carbon atoms, and specific examples of α -olefin having 4 to 10 carbon atoms include linear monoolefins such as 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene and 1-decene, branched monoolefins such as 3-methyl-1-butene, 3-methyl-1-pentene and 4-methyl-1-pentene, copolymers of propylene and the other monomer copolymerizable therewith such as vinylcyclohexane may be random copolymers or block copolymers.
The content of the other monomer is, for example, 0.1 to 20% by weight, preferably 0.5 to 10% by weight, in the copolymer.
Among the above, as the polypropylene-based resin, a homopolymer of propylene, a propylene-ethylene random copolymer, a propylene-1-butene random copolymer or a propylene-ethylene-1-butene random copolymer can be preferably used.
The cyclic polyolefin resin is a general term for resins obtained by polymerizing a cyclic olefin as a polymerization unit, and includes ring-opening (co) polymers of cyclic olefins, addition polymers of cyclic olefins, copolymers of cyclic olefins with linear olefins such as ethylene and propylene (typically random copolymers), graft polymers obtained by modifying these with unsaturated carboxylic acids or derivatives thereof, and hydrogenated products thereof. Among these, norbornene-based resins using norbornene-based monomers such as norbornene and polycyclic norbornene-based monomers can be preferably used as the cyclic olefin.
The base film may be composed of 1 kind of cyclic polyolefin resin, a mixture of 2 or more kinds of cyclic polyolefin resins, or a copolymer of 2 or more kinds of cyclic polyolefin resins.
The polyester resin is a resin having an ester bond, and is generally a resin formed of a polycondensate of a polycarboxylic acid or a derivative thereof and a polyol. As the polycarboxylic acid or a derivative thereof, a dibasic dicarboxylic acid or a derivative thereof can be used, and examples thereof include terephthalic acid, isophthalic acid, dimethyl terephthalate, dimethyl naphthalenedicarboxylate, and the like. As the polyhydric alcohol, a dihydric diol can be used, and examples thereof include ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, cyclohexanedimethanol, and the like.
Specific examples of the polyester resin include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polypropylene terephthalate, polypropylene naphthalate, polycyclohexylenedimethylene terephthalate, polycyclohexylenedimethylene naphthalate, and polycyclohexylenedimethylene naphthalate. In the case of a polyester resin film such as polyethylene terephthalate, stretching may be performed in advance in order to increase the elastic modulus. The stretching may be uniaxial stretching or biaxial stretching.
The base film may be composed of 1 type of polyester resin, a mixture of 2 or more types of polyester resins, or a copolymer of 2 or more types of polyester resins.
Examples of the (meth) acrylic resin include poly (meth) acrylates such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymers, methyl methacrylate- (meth) acrylate copolymers, methyl methacrylate-acrylate- (meth) acrylic acid copolymers, methyl (meth) acrylate-styrene copolymers (MS resins and the like), and polymers having an alicyclic hydrocarbon group (for example, methyl methacrylate-cyclohexyl methacrylate copolymers, methyl methacrylate- (meth) acrylic acid norbornyl ester copolymers and the like). Poly (meth) acrylic acid C such as poly (methyl (meth) acrylate) can be preferably usedl－6Alkyl estersA methyl methacrylate resin containing methyl methacrylate as a main component (50 to 100% by weight, preferably 70 to 100% by weight) can be more preferably used.
The base film may be composed of 1 type of (meth) acrylic resin, a mixture of 2 or more types of (meth) acrylic resins, or a copolymer of 2 or more types of (meth) acrylic resins.
The cellulose ester resin is an ester of cellulose and a fatty acid. Specific examples of the cellulose ester resin include cellulose triacetate, cellulose diacetate, cellulose tripropionate, and cellulose dipropionate. Among these, cellulose triacetate (triacetyl cellulose) is particularly preferable.
The base film may be composed of 1 kind of cellulose ester resin, or may be composed of a mixture of 2 or more kinds of cellulose ester resins, or may be composed of a copolymer of 2 or more kinds of cellulose ester resins.
The polycarbonate resin contains a polymer in which monomer units are bonded to each other through a carbonate group. The polycarbonate-based resin may be a resin called modified polycarbonate in which a polymer skeleton is modified in order to reduce a photoelastic coefficient, a copolymerized polycarbonate in which wavelength dependence is improved, or the like.
The base film may be composed of 1 type of polycarbonate resin, a mixture of 2 or more types of polycarbonate resins, or a copolymer of 2 or more types of polycarbonate resins.
In the base film, any appropriate additive may be added in addition to the thermoplastic resin. Examples of such additives include ultraviolet absorbers, antioxidants, lubricants, plasticizers, mold release agents, coloring inhibitors, flame retardants, nucleating agents, antistatic agents, pigments, and colorants. The content of the thermoplastic resin in the base film is preferably 50 to 100% by weight, more preferably 50 to 99% by weight, still more preferably 60 to 98% by weight, and particularly preferably 70 to 97% by weight. When the content of the thermoplastic resin in the base film is less than 50% by weight, high transparency and the like inherent in the thermoplastic resin may not be sufficiently exhibited.
The thickness of the base film 1 can be suitably determined, and is usually preferably 1 to 500. mu.m, more preferably 1 to 300. mu.m, further preferably 5 to 200. mu.m, and most preferably 5 to 150. mu.m, from the viewpoint of workability such as strength and workability.
The width of the base film 1 may be appropriately determined, and may be 500mm or more, or 1000mm or more. The laminate film of the present invention can effectively suppress wrinkles and slacks at both ends in the width direction even when the width is 500mm or more. The length of the base film 1 may be longer than the width, and may be 100m or more, preferably 500m or more.
The tensile elastic modulus at 80 ℃ of the base film may be 140MPa or more, more preferably 180MPa or more, and still more preferably 200MPa or more, from the viewpoint of suppressing defects such as wrinkles or creases in the drying step and poor drying of the coating layer.
The tensile elastic modulus of the base film at 80 ℃ is usually 1000MPa or less, preferably 800MPa or less, and more preferably 600MPa or less. When the tensile elastic modulus of the base film at 80 ℃ exceeds 1000MPa, a large force is required in the stretching step, and the apparatus may become huge.
(pretreatment of substrate film)
In order to improve the adhesion to the polyvinyl alcohol resin layer, the surface of the base film 1 may be pretreated by a pretreatment means as necessary.
(surface activation)
For example, as shown in fig. 1 (a), the surface of the base film 1 supplied from the unwinding unit 30 may be activated by a surface activating means 42 such as corona discharge treatment, plasma treatment, or flame treatment.
(formation of undercoat layer)
In order to improve the adhesion to the polyvinyl alcohol resin layer, an undercoat layer may be formed on the surface of the base film 1, preferably on the surface subjected to the surface activation treatment, by an undercoat layer forming means.
For example, as shown in fig. 1 (b), the coating liquid for forming the undercoat layer is applied to the surface of the base film 1 supplied from the unwinding section 32 by the coating means 44, and then the coated layer is dried by the drying means 46 to obtain a base film having the undercoat layer, and then the base film 1 can be wound up by the winding section 33. The coating liquid for forming an undercoat layer may contain a resin component and a solvent. As the resin component, a thermoplastic resin excellent in transparency, thermal stability, stretchability, and the like can be preferably used, and examples thereof include (meth) acrylic resins, polyvinyl alcohol resins, and the like. As the solvent, a conventional organic solvent or an aqueous solvent such as water in which the resin component can be dissolved can be usually used.
In order to increase the strength of the undercoat layer, a crosslinking agent may be added to the coating liquid for forming the undercoat layer. The crosslinking agent may be appropriately selected from known crosslinking agents such as organic and inorganic crosslinking agents according to the type of the thermoplastic resin used. As the crosslinking agent, the crosslinking agent described in WO2013/146644 can be used. The solid content concentration of the undercoat layer coating liquid is preferably about 1 to 25 wt%.
The thickness of the primer layer is preferably 0.05 to 1 μm, and more preferably 0.1 to 0.4 μm.
The coating means 44 for applying the coating liquid for forming an undercoat layer to the base film 1 may be the same as or different from the coating means 48 for forming a polyvinyl alcohol resin layer, which will be described later.
(coating of polyvinyl alcohol resin solution)
After the pretreatment, for example, as shown in fig. 1 (c), a solution of a polyvinyl alcohol resin is applied to the surface of the base film 1 supplied from the unwinding part 34 by an application means 48, thereby forming a coating layer 2. The solution of the polyvinyl alcohol resin can be obtained by dissolving a powder of the polyvinyl alcohol resin in an aqueous solvent such as water.
Examples of the polyvinyl alcohol resin are polyvinyl alcohol resin and derivatives thereof. Examples of derivatives of polyvinyl alcohol resins are polyvinyl formal; polyvinyl acetal; polyvinyl alcohol resins obtained by modifying polyvinyl alcohol resins with olefins such as ethylene and propylene, unsaturated carboxylic acids such as acrylic acid, methacrylic acid, and crotonic acid, alkyl esters of unsaturated carboxylic acids, acrylamides, and the like.
The polyvinyl alcohol resin preferably has an average polymerization degree of 100 to 10000, more preferably 1000 to 10000. In particular, 1500 to 8000, and most preferably 2000 to 5000 are more preferable. The average polymerization degree is a value determined by a method defined in JIS K6726 (1994). When the average polymerization degree is less than 100, satisfactory optical characteristics are difficult to obtain. When the amount exceeds 10000, the solubility in water is poor, and the formation of a resin layer becomes difficult.
The polyvinyl alcohol resin is preferably a saponified product. The saponification degree is preferably 80.0 to 100.0 mol%, more preferably 90.0 to 99.5 mol%, and still more preferably 93.0 to 99.5 mol%. For example, a polyvinyl alcohol resin having a saponification degree of 98.0 to 99.5 mol% can be used.
When the saponification degree is less than 80.0 mol%, satisfactory optical characteristics are difficult to obtain. The saponification degree is a value representing the ratio of an acetate group contained in a polyvinyl acetate resin as a raw material of a polyvinyl alcohol resin to be converted into a hydroxyl group through a saponification step, and is defined by the following formula.
Degree of saponification (% by mole) × 100 × (number of hydroxyl groups)/(number of hydroxyl groups + number of acetate groups) ×
It can be determined by a method prescribed in JIS K6726 (1994).
The solid content concentration in the solution is preferably 5% by weight or more, more preferably 5 to 15% by weight, and still more preferably 5 to 10% by weight. When the amount is less than 5% by weight, the water content increases, and the drying efficiency deteriorates. When the amount exceeds 15% by weight, the viscosity tends to increase, and handling tends to become difficult.
The viscosity of the solution at the time of coating is preferably 500 to 10000cps, more preferably 1000 to 7000cps, and further preferably 1000 to 5000 cps. When the viscosity is less than 500cps, the film thickness tends to be difficult to control, and when the viscosity exceeds 10000cps, the liquid feeding tends to be difficult. The viscosity of the solution can be adjusted by heating or cooling the solution, in addition to the composition of the solution.
Examples of the aqueous solvent include water and alcohols such as methanol.
The solution may contain additives such as a plasticizer and a surfactant as needed. Examples of the plasticizer include polyhydric alcohols and condensates thereof, and examples thereof include glycerin, diglycerin, triglycerol, ethylene glycol, propylene glycol, and polyethylene glycol. The amount of the additive is preferably 20% by weight or less based on the weight of the polyvinyl alcohol resin.
Examples of the coating means 48 include roll coating methods such as wire bar coating method, reverse coating, and gravure coating; die coating; comma coating method; lip coating; spin coating; a blade coating method; screen coating; spray coating; an impregnation method; the method is suitably selected from known methods such as spraying. In the step of applying the polyvinyl alcohol resin solution, the solution is continuously applied while the base film 1 is conveyed in the longitudinal direction thereof. The longitudinal direction is not necessarily the horizontal direction. The coating is preferably performed on the upper surface of the substrate film 1.
The average film thickness (WET film thickness) of the solution of the polyvinyl alcohol resin to be coated can be, for example, 50 to 200 μm. The coating width of the solution may be the same as the total width of the substrate film 1 or may be narrower than the total width of the substrate film 1.
As shown in fig. 2(a), in the present invention, the coating layer 2 is formed by applying the polyvinyl alcohol resin solution so that the center portion in the width direction of the coating layer 2 is thicker than both end portions. Examples of such a coating method include the following methods: in the gravure coating method, a doctor blade (sector blade) having a curved blade edge is used to reduce the amount of the scraped solution in the center portion and increase the amount of the scraped solution in both end portions; a method in which the gap between a slit for discharging the coating liquid formed between the leading edge and the edge of the doctor blade and the liquid reservoir is made wider at the center and narrower at both ends in the die coating method; in the doctor blade coating method, a blade having a curved blade edge is used, and the gap between the substrate film and the blade edge is made wide at the center and narrow at both ends; in the comma coating method, a thin film is wound around both ends of a backing roll (backup roll), and the gap between the comma roll and the substrate film is made wider at the center and narrower at both ends.
In the coating layer 2 (the layer before drying to obtain the polyvinyl alcohol resin layer), it is preferable that the coating layer is applied so that the thickness measured at the center in the width direction is 2.5% or more, preferably 3.0% or more, greater than the thickness measured at a position 50mm from the edge in the width direction of the coating layer.
In general, it is sufficient to coat the coating layer to a thickness of about 5.0%. The film thickness measured at a position 50mm from the edge was the one having a large difference from the film thickness measured at the center among the 2 measured values.
The polyvinyl alcohol resin layer 3 satisfying the above formula (1-1) can be formed by applying the polyvinyl alcohol resin solution as described above to obtain the coating layer 2 and drying the coating layer 2.
(drying Process)
Next, while the substrate film 1 coated with the solution is conveyed in the longitudinal direction thereof, the coated solution is dried by the drying means 50, and as shown in fig. 3 (a), the laminated film 10 of the present invention having the polyvinyl alcohol resin layer 3 on the substrate film 1 is obtained.
In the drying step, the conveyance direction of the substrate film 1 is preferably a horizontal direction, and the substrate film 1 may be conveyed in a direction inclined at about 45 ° to the horizontal direction.
Examples of the drying means 50 include a suspension dryer that supplies hot air from both sides of the base film to support and dry the base film 1 in the air in a non-contact manner, an infrared dryer that irradiates infrared rays onto the base film 1 conveyed in the air, and a microwave dryer.
The drying temperature, for example, the temperature of the resin layer during drying or the temperature of hot air during supply of hot air to the base film 1, may be set to, for example, 50 to 200 ℃, preferably 60 to 150 ℃, and more preferably 80 ℃ or higher. When the solution contains water, the temperature is preferably 80 ℃ or higher. The drying time, i.e., the time for the transfer film to travel in the drying means, may be set to 2 to 20 minutes. In the drying step, the solution is preferably applied to the upper surface of the base film 1.
Through this drying step, as shown in fig. 3 (a), a laminated film 10 having the polyvinyl alcohol resin layer 3 on one surface of the base film 1 is formed. The average thickness of the polyvinyl alcohol resin layer 3 after drying is usually 20 μm or less, preferably 10 μm or less, from the viewpoint of imparting good polarizing performance and durability. The average thickness of the polyvinyl alcohol resin layer 3 is usually 2 μm or more.
Further, the pretreatment of the surface of the base film 1, the application of the solution, and the drying step are performed again as needed on the opposite surface of the base film, and as shown in fig. 3 (b), a laminated film 10 having the polyvinyl alcohol resin layers 3 on both surfaces of the base film 1 can be formed.
In addition, pretreatment and coating of a solution may be performed on both sides of the base film 1, and the coating layers provided on both sides of the base film 1 may be simultaneously dried.
In the above embodiment, the respective steps of pretreatment, formation of an undercoat layer, and formation of a resin layer (coating and drying) are performed in a batch manner, that is, a film roll is obtained after each step, and a film is obtained and processed by unwinding the roll in a subsequent step, but any 2 or more of the above steps may be continuously performed, that is, 2 or more steps may be continuously performed without winding up into a roll.
(method for producing stretched laminate film)
Next, the obtained laminated film 10 (which may have the polyvinyl alcohol resin layer 3 only on one side of the base film 1 or may have the polyvinyl alcohol resin layers 3 on both sides of the base film 1) is unwound from the roll and stretched to obtain a stretched laminated film of the present invention. The dyeing step may be performed before the stretching step, or the stretching step and the dyeing step may be performed simultaneously. Further, the stretching may be carried out in air or in water. The stretched laminate film is preferably wound into a roll to produce a roll of stretched laminate film. The storage period of the stretched laminate film roll is preferably 2 years or less, more preferably 1 year or less. When the transfer time of the roll from the stretching step to the next step is also referred to as a storage period, the storage period is usually 30 minutes or more. In order to prevent the occurrence of the curl (curl) and the deterioration of the surface state due to the movement of water, it is preferable to store the film by taking a moisture-proof measure such as covering the stretched laminate film roll with a retort resistant aluminum film (aluminum film).
By forming the film into a roll once after the completion of each step as described above, the loss when a failure occurs in any step or when the step is started up is smaller than when each step is continuously performed. The storage of the rolls other than the stretched laminate film roll is the same as described above.
The stretching may be performed using various known methods. For example, the longitudinal stretching may be performed by stretching the laminate film 10 in the longitudinal direction, the transverse stretching may be performed by stretching the laminate film 10 in the width direction, or the oblique stretching may be performed. Among them, it is preferable to perform longitudinal stretching (uniaxial stretching) while conveying the laminated film 10 in the longitudinal direction. The stretching magnification can be adjusted as appropriate according to the desired polarization characteristics, and for example, it can be set to 5 to 17 times, and can be set to 5 to 8 times.
The stretching may be performed in one stage, or may be performed in a plurality of stages.
In the stretching step, the base film is preferably stretched together with the stretching of the polyvinyl alcohol resin layer. That is, the stretching ratio of the polyvinyl alcohol resin layer is preferably substantially the same as the stretching ratio of the base film. The stretching ratios are substantially the same, and the difference between the stretching ratio of the polyvinyl alcohol resin layer and the stretching ratio of the base film is 0, and the difference is preferably 0.0. Preferably, the stretching direction of the polyvinyl alcohol resin layer is substantially the same as the stretching direction of the base film. The stretching directions are substantially the same, and the angle formed between the stretching direction of the polyvinyl alcohol resin layer and the stretching direction of the base film is less than 5 °, preferably less than 1 °.
The average thickness of the stretched polyvinyl alcohol resin layer in the width direction is preferably 10 μm or less, more preferably 7 μm or less, and still more preferably 5.5 μm or less. In addition, the average thickness of the stretched polyvinyl alcohol resin layer in the width direction is usually 1 μm or more, preferably 2 μm or more, from the viewpoint of imparting good durability.
(method for producing polarizing multilayer film)
In the dyeing step, various known methods such as dipping the laminated film or stretching the laminated film in a dyeing bath can be used. For example, a dichroic pigment may be used as the dye. Examples of the dichroic dye include iodine and organic dyes. In the dyeing, crosslinking treatment of polyvinyl alcohol in a resin tank may be performed. After dyeing, the laminated film is preferably washed with water and dried.
The average value of the thicknesses of the polarizer layers is preferably 10 μm or less, more preferably 7 μm or less, and still more preferably 5.5 μm or less. In addition, the average value of the thicknesses of the polarizer layers is usually 1 μm or more, and preferably 2 μm or more.
(method for producing polarizing plate)
Next, a method for manufacturing the polarizing plate will be described. First, a protective film is attached to the polarizer layer 5 of the polarizing laminated film 12 via an adhesive, to obtain a multilayer film. When the polarizer layers 5 are provided on both sides of the base film 1, a protective film is attached to each polarizer layer 5. Next, the base film 1 was peeled off from the multilayer film, and 2 polarizing plates were obtained in which the protective film was laminated to the polarizer layer 5 with an adhesive interposed therebetween. When the polarizing laminate film 12 has the polarizer layer 5 only on one side, 1 polarizing plate can be obtained.
In the present invention, since the polarizing laminate film is inhibited from being loosened and wrinkled at both ends in the width direction, the polarizing plate can be stably produced with a high yield when the protective film is bonded to the polarizer layer.
As the protective film 3, various known films can be used. For example, the substrate film 1 exemplified above can be used.
As the adhesive, various known adhesives can be used. For example, an active energy ray-curable adhesive such as an ultraviolet ray-curable epoxy resin can be used.
The obtained polarizing plate can be wound around a shaft and stored as a polarizing plate roll, if necessary. In the polarizing plate according to the present embodiment, the thickness of the end portions in the width direction of the polarizer layer 5 is not much larger than the thickness of the center portion in the width direction of the polarizer layer 5, and therefore, the same effect of preventing sag as described above can be exhibited even when the polarizing plate is stored in a rolled form. The polarizing plate can be obtained by unwinding the polarizing plate from a roll after storage as needed, and cut into a desired size. The obtained polarizing plate can be formed to be thin, can be suitably used as a polarizing material for a liquid crystal display element or the like, and can be mounted on a liquid crystal display device.
Examples
The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following examples. In the examples, unless otherwise specified, parts and% indicating the amount of use or content are based on weight.
[ measurement of film thickness of coating layer ]
The film thickness of the coating layer was measured at a position 50mm from the edge and at the center of the coating layer in the width direction thereof using a film thickness measuring instrument (SI-80T) manufactured by Keyence Corporation. The film thickness of the coating layer was measured at intervals of 7mm in the MD direction on line (in-line), and the average of the film thickness data of 10m was obtained.
[ other film thickness measurements ]
The film thickness was measured over the total width in the width direction using an interference type film thickness meter (F20) manufactured by filmetics corporation. The measurement was performed while moving the sample by the automatic stage so that the acquisition interval of the film thickness data became 2mm or less.
[ example 1]
< production of laminated film >
(1) Substrate film
An unstretched polypropylene (PP) film (melting point: 163 ℃ C.) having a thickness of 90 μm was prepared as a base film. The tensile modulus of elasticity of the substrate film at 80 ℃ was 205 MPa.
(2) Preparation of coating liquid
Polyvinyl alcohol resin powder ("Z-200" manufactured by Nippon synthetic chemical Co., Ltd., average degree of polymerization 1100 and average degree of saponification of 99.5 mol%) was dissolved in hot water at 95 ℃ to prepare a 3% by weight aqueous polyvinyl alcohol solution. To the obtained aqueous solution, 1 part by weight of a crosslinking agent ("Sumirez Resin (registered trademark) 650" manufactured by sumitomo chemical corporation) was mixed with 2 parts by weight of the polyvinyl alcohol Resin powder to obtain a coating liquid for forming an undercoat layer.
A coating liquid for forming a resin layer was prepared by dissolving polyvinyl alcohol resin powder (PVA 124 manufactured by ltd., average polymerization degree 2400, average saponification degree 98.0 to 99.0 mol%) in hot water at 95 ℃.
(3) Coating and drying
Single-sided laminate
While continuously conveying the substrate film, one surface thereof is subjected to corona discharge treatment. The coating liquid for forming an undercoat layer was continuously applied to the corona-discharge-treated surface of the base film by a microgravure coater, and dried at 60 ℃ for 3 minutes to form an undercoat layer having a thickness of 0.2 μm. Next, the coating liquid for forming a resin layer was continuously applied on the undercoat layer by a comma coating method while the base film was conveyed, to obtain a coating layer. By winding a polyethylene terephthalate film having a thickness of 20 μm around both ends of the backup roll, the gap between the comma roll and the base film was widened at the center and narrowed at both ends. By drying the coating layer in a drying oven at 80 ℃ for 10 minutes, a polyvinyl alcohol (PVA) -based resin layer having an average thickness of 9.7 μm in the width direction was formed on the undercoat layer.
In this case, the thickness distribution (WET film thickness) of the coating layer in the width direction was about 3.5% thicker at the center than at both ends (positions 50mm from the edges). In the film thickness distribution in the width direction of the resin layer, D1 e-D1 c was-0.54 μm.
Double-sided laminate
Further, the surface (second coated surface) of the substrate film opposite to the surface (first coated surface) on which the resin layer was formed was subjected to the same treatment as in the production of the single-sided laminate, to form a primer layer having a thickness of 0.2 μm and a polyvinyl alcohol resin layer having an average thickness in the width direction of 9.6 μm, thereby producing a double-sided laminate. Then, the laminated film (double-sided laminate) was wound into a roll shape to obtain a laminated film roll.
In this case, the thickness distribution (WET film thickness) of the coating layer on the second coated surface in the width direction was about 3.0% thicker in the center portion than in the both end portions (positions 50mm from the edges). In the film thickness distribution in the width direction of the resin layer, D1 e-D1 c were-0.40 μm.
< production of stretched laminated film >
(4) Stretching
A laminated film (double-sided laminate) obtained by unwinding the laminated film roll obtained in the above (3) was continuously conveyed, stretched to 2.5 times in the machine direction (MD direction) at a stretching temperature of 140 ℃ between nip rolls (nip rolls), and then stretched in the machine direction at a stretching temperature of 160 ℃ so that the total stretching ratio became 5.8 times, to produce a stretched laminated film. Further, the stretched laminated film is wound into a roll shape to obtain a stretched laminated film roll. When the laminated film was unwound, wrinkles and slacks were not observed at both widthwise ends of the laminated film, and slacks were observed at the widthwise center. However, wrinkles and slackness were not observed in both the end portions and the central portion in the width direction of the stretched laminate film.
The average thickness of the resin layer on the first coated side and the average thickness of the resin layer on the second coated side of the stretched laminated film in the width direction were 4.9 μm and 4.9 μm, respectively. In this case, in the film thickness distribution in the width direction of the stretched polyvinyl alcohol resin layer on the first coated side and the second coated side, D2 e-D2 c were 0.07 μm and 0.11 μm, respectively. When the base film was taken out by peeling off the 2 resin layers of the stretched laminate film, D3e to D3c were 0.73 μm in the film thickness distribution in the width direction of the base film. In the film thickness distribution of the total thickness in the width direction of the stretched laminate film, D4 e-D4 c was 1.48 μm.
< production of polarizing multilayer film >
(5) Dyeing and crosslinking
The stretched laminate film obtained in (4) above was unwound to obtain a stretched laminate film, the stretched laminate film was immersed in a 30 ℃ dyeing solution containing iodine and potassium iodide so that the residence time became about 150 seconds, the resin layer was dyed, and then the excess dyeing solution was rinsed with 10 ℃ pure water. Next, the stretched laminated film was immersed in a 76 ℃ crosslinking solution containing boric acid and potassium iodide so that the residence time became 600 seconds, and subjected to crosslinking treatment to obtain a polarizing laminated film. Then, the polarizing laminated film was washed with pure water at 10 ℃ for 4 seconds and dried at 80 ℃ for 300 seconds. Further, the polarizing laminated film is wound to produce a polarizing laminated film roll. When the stretched laminated film was unwound, neither of the both end portions nor the central portion was wrinkled or slacked.
The average thickness of the polarizer layer on the first coated surface and the average thickness of the polarizer layer on the second coated surface in the width direction in the polarizing laminated film were 5.8 μm and 5.8 μm, respectively. In this case, in the film thickness distribution in the width direction of the polarizer layers on the first coated surface and the second coated surface, D5 e-D5 c were-0.12 μm and-0.09 μm, respectively. When the 2 polarizer layers included in the polarizing multilayer film were peeled off to take out the base film, D6e to D6c were 0.91 μm in the film thickness distribution in the width direction of the base film. In the film thickness distribution of the total thickness of the polarizing laminated film in the width direction, D7 e-D7 c was 1.21 μm.
The polarizer layer on the second coated surface side was peeled off and removed to obtain a polarizing laminated film comprising 2 layers of the substrate/polarizer layer on the first coated surface side. Both ends and the central portion of the polarizing laminated film were cut out, respectively, to prepare samples.
The visibility-corrected monomer transmittance Ty of the sample having the polarizer layer on the first coating surface side was measured by a spectrophotometer with an integrating sphere (V7100, manufactured by japan spectrographic corporation). Incident light is made to enter from the polarizer layer side. In the polarizer layer on the first application surface side, the visibility-correcting element transmittance Ty of one of the two end portions Ty, which is different from the visibility-correcting element transmittance Tyc in the central portion by a large value, was 42.51%, and at this time, the polarization degree Py was 99.983%. Tyc in the center portion was 42.34%, and the polarization degree Py was 99.978%.
Ty was also measured similarly for the polarizer layer on the second coating surface side removed. In the polarizer layer on the second coating surface side, the visibility-correcting element transmittance Ty of Ty at both end portions, which is a large difference from the visibility-correcting element transmittance Tyc at the central portion, was 42.59%, and in this case, the polarization degree Py was 99.980%. The Tyc degree in the center part was 42.52%, and the polarization degree Py was 99.981%.
Therefore, the value of | Type-Tyc | is 0.17% in the polarizer layer on the first coated surface side and 0.07% in the polarizer layer on the second coated surface side.
< production of polarizing plate >
(6) Preparation of adhesive solution
Polyvinyl alcohol resin powder ("KL-318" manufactured by ltd., having an average polymerization degree of 1800, KURARAY co., ltd.) was dissolved in hot water at 95 ℃ to prepare a polyvinyl alcohol aqueous solution having a concentration of 3% by weight. To the obtained aqueous solution, 1 part by weight of a crosslinking agent ("Sumirez Resin (registered trademark) 650", manufactured by sumitomo chemical corporation) was mixed with 2 parts by weight of the polyvinyl alcohol Resin powder to prepare an adhesive solution.
A polarizing laminated film was obtained by unwinding the polarizing laminated film roll obtained in (5) above, the adhesive solution was applied to both polarizer layers, and then a protective film (a transparent protective film made of triacetyl cellulose (TAC) (Konica Minolta Products co., ltd. "KC 4 UY") having a thickness of 40 μm) obtained by saponification treatment was attached to each polarizer layer. The polarizer layer and a TAC film are pressed and connected through a pair of bonding rollers to obtain a bonding film sequentially provided with a TAC film, a polarizer layer, a bottom coating layer, a substrate film, a bottom coating layer, a polarizer layer and a TAC film. When the polarizing laminated film was unwound, neither of the both end portions nor the central portion was wrinkled or loosened.
Peeling was performed between the substrate film and the undercoat layer in the laminated film, and the laminated film was divided into 2 films of a film having TAC film/polarizer layer/undercoat layer/substrate film in this order and a film having undercoat layer/polarizer layer/TAC film in this order. Next, the base film was peeled off and removed, and a polarizing plate having a TAC film/polarizer layer/undercoat layer in this order was obtained. In the peeling step, defects such as film breakage do not occur.
[ example 2]
A single-sided laminate was produced in the same manner as in example 1, except that the base film was changed to a polyethylene terephthalate (PET) film having a thickness of 38 μm and no primer layer was formed on the base film. The polyvinyl alcohol resin layer had an average thickness of 9.5 μm in the width direction. In this case, the thickness distribution (WET film thickness) of the coating layer in the width direction was about 3.3% thicker in the central portion than in the both end portions (positions 50mm from the edges). In the film thickness distribution in the width direction of the resin layer, D1 e-D1 c were-0.32 μm.
The laminated film is wound to obtain a laminated film roll, and then unwound from the laminated film roll to obtain the laminated film. At this time, wrinkles and slacks were not observed at both ends in the width direction of the laminated film, and slacks were observed at the center in the width direction.
Comparative example 1
Single-sided laminate
In example 1, a single-sided laminate was produced in the same manner as described above except that the control of the film thickness distribution (WET film thickness) of the coating layer was not particularly performed. At this time, the film thickness of the coating layer becomes substantially flat in the width direction. The polyvinyl alcohol resin layer had an average thickness of 9.7 μm in the width direction.
In this case, in the film thickness distribution in the width direction of the resin layer, D1 e-D1 c were 0.68 μm.
Double-sided laminate
A resin layer was formed in the same manner as in example 1 except that the film thickness distribution (WET film thickness) of the coating layer was not particularly controlled with respect to the surface (second coated surface) of the base film opposite to the surface (first coated surface) on which the resin layer was formed, and a laminated film (double-sided laminated product) was produced. Then, the laminated film is wound to obtain a laminated film roll. In this case, the polyvinyl alcohol resin layer on the second coated surface had an average thickness of 9.8 μm in the width direction. In the film thickness distribution in the width direction of the resin layer, D1 e-D1 c were 0.64 μm.
A stretched laminated film was produced by stretching the laminated film in the same manner as in example 1. The stretched laminate film is then wound to obtain a stretched laminate film roll. When the laminated film was unwound, slack was observed only at both ends of the laminated film.
The average thickness of the resin layer on the first coated side and the average thickness of the resin layer on the second coated side of the stretched laminated film in the width direction were 4.8 μm and 4.8 μm, respectively. In this case, in the film thickness distribution in the width direction of the resin layer on the first coated surface and the second coated surface, D2 e-D2 c were 0.28 μm and 0.37 μm, respectively. When the 2 resin layers of the stretched laminate film were peeled off to take out the base film, D3 e-D3 c became 1.47 μm in the film thickness distribution in the width direction of the base film. In the film thickness distribution of the total thickness in the width direction of the stretched laminate film, D4 e-D4 c was 2.28 μm.
Next, in example 1, a polarizing laminate film was produced by the same operation as above, except that the residence time of the stretched laminate film in the dyeing solution was set to about 170 seconds, and the stretched laminate film was unwound from the stretched laminate film roll and subjected to the dyeing step and the crosslinking step. Then, the polarizing laminated film is wound to obtain a polarizing laminated film roll. When the stretched laminated film was unwound, slack was observed only at both ends of the stretched laminated film. The average thickness of the polarizer layer on the first coated surface and the average thickness of the polarizer layer on the second coated surface of the polarizing laminated film in the width direction were 5.9 μm and 5.9 μm, respectively.
In this case, in the film thickness distribution in the width direction of the polarizer layers on the first coated surface and the second coated surface, D5 e-D5 c were 0.27 μm and 0.28 μm, respectively. When the 2 polarizer layers included in the polarizing stretched laminate film were peeled off to take out the base film, D6e to D6c were 1.3 μm in the film thickness distribution in the width direction of the base film. In the film thickness distribution of the total thickness of the polarizing laminated film in the width direction, D7 e-D7 c was 2.11 μm.
The polarizer layer on the second coated surface side was peeled off and removed, and a polarizing laminated film comprising 2 layers of the substrate/polarizer layer on the first coated surface side was produced. Both end portions and the central portion of the polarizing laminated film were cut, respectively, to prepare samples.
Ty of the sample having the polarizer layer on the first coating surface side was measured in the same manner as in example 1.
Of the Ty of the polarizer layers on the first coated surface side, Ty having a larger difference from Tyc at the central portion was 41.52%, and the polarization degree Py was 99.997%. Tyc in the center portion was 41.10%, and the polarization degree Py was 99.998%.
Ty was also measured for the polarizer layer on the removed second coating surface side in the same manner as in example 1.
Of the Ty at the both end portions of the polarizer layer on the second coated surface side, Ty having a larger difference from Tyc at the central portion was 41.42%, and the polarization degree Py was 99.998%. Tyc in the center portion was 40.94%, and the polarization degree Py was 99.998%.
Therefore, the value of | Tye-Tyc | is 0.42% in the polarizer layer on the first coated surface side and 0.48% in the polarizer layer on the second coated surface side.
The polarizing laminated film was obtained by unwinding the polarizing laminated film roll, and as a result, slack was observed at both ends in the width direction. An adhesive solution was applied to 2 polarizer layers in a polarizing laminate film to bond a protective film, but the relaxed portion formed wrinkles and the protective film could not be bonded.
The results of examples 1 and 2 and comparative example 1 are shown in tables 1 to 3. Unless otherwise specified, the units of numerical values in the table are μm. As described above, in the present invention, in the stretching step and the dyeing step, the relaxation of both ends in the width direction is suppressed, the polarizing plate can be stably manufactured, and the optical characteristics in the width direction are uniform.
TABLE 1
TABLE 2
TABLE 3
Industrial applicability
According to the present invention, wrinkles and slacks are less likely to occur at both ends in the width direction of a long laminated film, and the area of a portion that cannot be a product can be reduced. In addition, a polarizing plate having uniform optical characteristics in the width direction can be obtained. In addition, the protective film can be easily attached to the polarizing laminate film, and the polarizing plate can be stably manufactured.
Claims (21)
1. A laminated film having a substantially unstretched polyvinyl alcohol resin layer on at least one surface of a long base film, wherein when the polyvinyl alcohol resin layer is equally divided into 9 regions in the width direction, the average film thickness D1e in the outermost region and the average film thickness D1c in the central region satisfy the following formula:
D1e－D1c≤－0.3μm
the average film thickness D1e in the outermost region is the average film thickness that is significantly different from the average film thickness D1c in the central region among the average film thicknesses in the outermost 2 regions.
2. The laminate film according to claim 1, wherein an average value of the thickness of the substantially unstretched polyvinyl alcohol resin layer in the width direction is 10 μm or less.
3. A stretched laminate film comprising a stretched polyvinyl alcohol resin layer on at least one surface of a long base film, wherein when the stretched polyvinyl alcohol resin layer is divided into 9 regions in the width direction, the average film thickness D2e in the outermost region and the average film thickness D2c in the central region satisfy the following formula:
D2e－D2c≤0.25μm
the average film thickness D2e in the outermost region is the average film thickness that is significantly different from the average film thickness D2c in the central region among the average film thicknesses in the outermost 2 regions.
4. The stretched laminate film according to claim 3, wherein the average thickness of the stretched polyvinyl alcohol resin layer in the width direction is 7 μm or less.
5. The stretched laminate film according to claim 3 or 4, wherein when the base film is divided into 9 regions in the width direction, the average film thickness D3e in the outermost region and the average film thickness D3c in the central region satisfy the following formula:
D3e－D3c≤1.0μm
the average film thickness D3e in the outermost region is the average film thickness that is significantly different from the average film thickness D3c in the central region among the average film thicknesses in the outermost 2 regions.
6. The stretched laminate film according to claim 3 or 4, wherein when the stretched laminate film is divided into 9 regions in the width direction, the average film thickness D4e in the outermost region and the average film thickness D4c in the central region satisfy the following formula:
D4e－D4c≤1.5μm
the average film thickness D4e in the outermost region is the average film thickness that is significantly different from the average film thickness D4c in the central region among the average film thicknesses in the outermost 2 regions.
7. The stretched laminate film according to claim 5, wherein when the stretched laminate film is divided into 9 regions in the width direction, the average film thickness D4e in the outermost region and the average film thickness D4c in the central region satisfy the following formula:
D4e－D4c≤1.5μm
the average film thickness D4e in the outermost region is the average film thickness that is significantly different from the average film thickness D4c in the central region among the average film thicknesses in the outermost 2 regions.
8. A polarizing laminated film having a polarizer layer on at least one surface of a long base film, wherein when the polarizer layer is equally divided into 9 regions in a width direction, an average film thickness D5e in an outermost region and an average film thickness D5c in a central region satisfy the following formula:
D5e－D5c≤0.25μm
the average film thickness D5e in the outermost region is the average film thickness that is significantly different from the average film thickness D5c in the central region among the average film thicknesses in the outermost 2 regions.
9. The polarizing laminate film according to claim 8, wherein the average value of the thickness of the polarizer layer in the width direction is 7 μm or less.
10. The polarizing laminate film according to claim 8 or 9, wherein when the substrate film is equally divided into 9 regions in the width direction, the average film thickness D6e in the outermost region and the average film thickness D6c in the central region satisfy the following formula:
D6e－D6c≤1.0μm
the average film thickness D6e in the outermost region is the average film thickness that is significantly different from the average film thickness D6c in the central region among the average film thicknesses in the outermost 2 regions.
11. The polarizing laminate film according to claim 8 or 9, wherein when the polarizing laminate film is equally divided into 9 regions in the width direction, the average film thickness D7e in the outermost region and the average film thickness D7c in the central region satisfy the following formula:
D7e－D7c≤1.5μm
the average film thickness D7e in the outermost region is the average film thickness that is significantly different from the average film thickness D7c in the central region among the average film thicknesses in the outermost 2 regions.
12. The polarizing laminate film according to claim 10, wherein when the polarizing laminate film is equally divided into 9 regions in the width direction, the average film thickness D7e in the outermost region and the average film thickness D7c in the central region satisfy the following formula:
D7e－D7c≤1.5μm
the average film thickness D7e in the outermost region is the average film thickness that is significantly different from the average film thickness D7c in the central region among the average film thicknesses in the outermost 2 regions.
13. The polarizing laminate film according to claim 8 or 9, wherein the visibility-correcting monomer transmittance ty measured at a position 25mm from the edge in the width direction of the polarizer layer and the visibility-correcting monomer transmittance Tyc measured at the center in the width direction of the polarizer layer satisfy the following formula:
|Tye－Tyc|≤0.40％
the visibility correction cell transmittance ty measured at a position 25mm from the edge is the one of the 2 measured values which is greatly different from the visibility correction cell transmittance Tyc measured at the center.
14. The polarizing laminate film according to claim 10, wherein the visibility-correcting monomer transmittance ty measured at a position 25mm from the edge in the width direction of the polarizer layer and the visibility-correcting monomer transmittance Tyc measured at the center in the width direction of the polarizer layer satisfy the following formula:
|Tye－Tyc|≤0.40％
the visibility correction cell transmittance ty measured at a position 25mm from the edge is the one of the 2 measured values which is greatly different from the visibility correction cell transmittance Tyc measured at the center.
15. The polarizing laminate film according to claim 11, wherein the visibility-correcting monomer transmittance ty measured at a position 25mm from the edge in the width direction of the polarizer layer and the visibility-correcting monomer transmittance Tyc measured at the center in the width direction of the polarizer layer satisfy the following formula:
|Tye－Tyc|≤0.40％
the visibility correction cell transmittance ty measured at a position 25mm from the edge is the one of the 2 measured values which is greatly different from the visibility correction cell transmittance Tyc measured at the center.
16. The polarizing laminate film according to claim 12, wherein the visibility-correcting monomer transmittance ty measured at a position 25mm from the edge in the width direction of the polarizer layer and the visibility-correcting monomer transmittance Tyc measured at the center in the width direction of the polarizer layer satisfy the following formula:
|Tye－Tyc|≤0.40％
the visibility correction cell transmittance ty measured at a position 25mm from the edge is the one of the 2 measured values which is greatly different from the visibility correction cell transmittance Tyc measured at the center.
17. A method for producing a laminated film, comprising the steps of:
a step of applying an aqueous solution containing a polyvinyl alcohol resin to at least one surface of a long base film so that a central portion of the coating layer in a width direction is thicker than both end portions thereof to form a coating layer; and
and drying the coating layer to form a resin layer made of a polyvinyl alcohol resin.
18. A method for producing a stretched laminate film, comprising: a step of uniaxially stretching the laminate film according to claim 17 to more than 5 times to obtain a stretched laminate film.
19. A method of manufacturing a roll of stretch laminate film, comprising: a step of winding the stretched laminate film according to claim 18 into a roll to obtain a roll of the stretched laminate film.
20. A method for producing a polarizing laminated film, comprising: a step of dyeing the stretched laminate film according to claim 18 or the stretched laminate film unwound from the stretched laminate film roll according to claim 19 to obtain a polarizing laminate film.
21. A method for manufacturing a polarizing plate, comprising the steps of:
a bonding step of bonding a protective film to a surface of the polarizer layer of the polarizing laminated film according to claim 20 on the side opposite to the substrate film side to obtain a multilayer film; and
and a peeling step of peeling the base film from the multilayer film.
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| JP6535799B1 (en) * | 2018-08-27 | 2019-06-26 | 日東電工株式会社 | Method for producing stretched resin film, method for producing polarizer, and device for producing stretched resin film |
| JP6535406B1 (en) * | 2018-08-27 | 2019-06-26 | 日東電工株式会社 | Method for producing stretched resin film, method for producing polarizer, method for measuring moisture content of stretched resin film, and device for producing stretched resin film |
| KR20200123743A (en) * | 2019-04-22 | 2020-10-30 | 스미또모 가가꾸 가부시키가이샤 | Inspection method, method for producing resin film roll and resin film roll |
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| JP2009098653A (en) | 2007-09-27 | 2009-05-07 | Nitto Denko Corp | Polarizing plate, optical film and image display device |
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