CN111796354A - Optical laminate - Google Patents
Optical laminate Download PDFInfo
- Publication number
- CN111796354A CN111796354A CN202010243250.3A CN202010243250A CN111796354A CN 111796354 A CN111796354 A CN 111796354A CN 202010243250 A CN202010243250 A CN 202010243250A CN 111796354 A CN111796354 A CN 111796354A
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- Prior art keywords
- layer
- adhesive
- optical laminate
- retardation
- polarizing
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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
- G02B5/3016—Polarising elements involving passive liquid crystal elements
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Polarising Elements (AREA)
- Laminated Bodies (AREA)
Abstract
The invention provides an optical laminate which can inhibit the uniformity of the color tone of reflected light in a surface from deteriorating even when exposed to external light including ultraviolet rays. The optical laminate comprises a polarizing layer, a pressure-sensitive adhesive layer, and a 1 st retardation layer in this order. The 1 st retardation layer is a liquid crystal layer. The optical laminate has a glue-missing portion at an end portion in the plane direction thereof, and the glue-missing portion is formed such that, in a cross section passing through a portion where the 1 st retardation layer and the adhesive layer overlap in the lamination direction, a position of an innermost end of the end portion of the adhesive layer is located inward in a range of more than 0 μm and 10 μm or less with respect to a position of an outermost end of the end portion of the 1 st retardation layer.
Description
Technical Field
The present invention relates to an optical laminate.
Background
Polarizing layers, retardation layers, and the like are widely used as optical members constituting organic EL display devices and liquid crystal display devices using Organic Light Emitting Diodes (OLEDs). For example, patent document 1 describes: a composite polarizing plate obtained by laminating a polarizing plate and a retardation film coated with a liquid crystal compound is used in a liquid crystal display device.
Patent document 1 describes: by eliminating irregularities existing on the outer peripheral end face (cut face) when the composite polarizing plate is cut with a microtome or the like, it is possible to suppress defects such as peeling and lifting of the retardation film even under humid and hot conditions.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2008-9237
Disclosure of Invention
Problems to be solved by the invention
It was found that when a composite polarizing plate obtained by laminating a polarizing layer and a retardation film is exposed to external light including ultraviolet rays, the color tone of reflected light at the end of the composite polarizing plate changes, and the uniformity of the color tone of the reflected light in the plane deteriorates.
An object of the present invention is to provide an optical laminate that can suppress deterioration in uniformity of color tone of reflected light in a plane even when exposed to external light including ultraviolet rays.
Means for solving the problems
The present invention provides the following optical laminate.
[ 1] an optical laminate comprising a polarizing layer, a pressure-sensitive adhesive layer, and a 1 st retardation layer in this order, wherein the 1 st retardation layer is a liquid crystal layer,
the optical laminate has a glue-lacking portion at an end portion in a plane direction thereof,
the adhesive-missing part is formed such that, in a cross section passing through a portion where the 1 st retardation layer and the adhesive layer overlap in the lamination direction, a position of an innermost end of an end portion of the adhesive layer is located inward in a range of more than 0 μm and 10 μm or less with respect to a position of an outermost end of the end portion of the 1 st retardation layer.
[ 2 ] the optical laminate according to [ 1], wherein the optical laminate has a square shape or a square shape having a notch portion on at least one side,
the glue lacking part is formed on at least one side of the square.
[ 3 ] the optical laminate according to [ 2 ], wherein the square shape has a pair of long sides and a pair of short sides,
the absorption axis direction of the polarizing layer forms an angle of 45 ° ± 10 ° with respect to the long side,
the adhesive-lacking portion is formed on at least one of the pair of long sides and at least one of the pair of short sides.
[ 4 ] the optical laminate according to [ 2 ], wherein the square shape has a pair of long sides and a pair of short sides,
the absorption axis direction of the polarizing layer forms an angle of 0 ° ± 10 ° with respect to the long side,
the adhesive-lacking portion is formed on at least one of the pair of short sides.
[ 5 ] the optical laminate according to [ 2 ], wherein the square shape has a pair of long sides and a pair of short sides,
the absorption axis direction of the polarizing layer forms an angle of 0 ° ± 10 ° with respect to the short side,
the adhesive-lacking portion is formed on at least one of the pair of long sides.
An optical laminate according to any one of [ 1] to [ 5 ], wherein a position of an end of the adhesive layer on the 1 st retardation layer side of the lacking portion is located outside a position of an end of the surface of the polarizing layer in the plane direction.
An optical laminate according to any one of [ 1] to [ 6 ], wherein the polarizing layer has a protective layer on one or both surfaces thereof.
The optical laminate according to any one of [ 1] to [ 7 ], further comprising a 2 nd retardation layer on a side of the 1 st retardation layer opposite to the pressure-sensitive adhesive layer.
The optical laminate according to [ 9 ] or [ 8 ], wherein the 2 nd retardation layer is provided on the 1 st retardation layer via an adhesive layer.
The optical laminate according to any one of [ 1] to [ 9 ], wherein the pressure-sensitive adhesive layer contains an ultraviolet absorber.
The optical laminate according to any one of [ 1] to [ 10 ], which is a circularly polarizing plate.
Effects of the invention
According to the present invention, it is possible to provide an optical layered body that can suppress deterioration in uniformity of color tone of reflected light in a plane even when exposed to external light including ultraviolet rays.
Drawings
Fig. 1 is a cross-sectional view schematically showing an example of the optical laminate of the present invention.
Fig. 2 is a cross-sectional view schematically showing another example of the optical laminate of the present invention.
Fig. 3(a) and (b) are schematic views for explaining a method of manufacturing an adhesive layer according to an embodiment.
Description of the symbols
5 glue-lacking part, 11 optical laminated body, 12 optical laminated body, 21 st phase difference layer, 1 nd phase difference layer, 22 nd phase difference layer, 2 nd phase difference layer, 31 adhesive layer, 35 adhesive layer, 40 polarizing plate, 41 polarizing layer, 42 st protective layer, 1 st protective layer, 43 nd protective layer, 2 nd protective layer, 60 adhesive layer with stripping film, 61 adhesive layer, 62 stripping film, 65 cutting knife and 65a cutting edge part.
Detailed Description
Preferred embodiments of the optical laminate of the present invention will be described below with reference to the drawings. The scope of the present invention is not limited to the embodiments described herein, and various modifications can be made without departing from the spirit of the present invention.
Fig. 1 is a cross-sectional view schematically showing an example of an optical laminate according to the present embodiment. In the figure, W represents a plane direction. As shown in fig. 1, the optical laminate 11 of the present embodiment includes a polarizing plate 40, an adhesive layer 31, and a 1 st retardation layer 21 in this order. The polarizing plate 40 of the optical laminate 11 shown in fig. 1 includes a 1 st protective layer 42 (protective layer), a polarizing layer 41, and a 2 nd protective layer 43 (protective layer) in this order, and the adhesive layer 31 is provided on the 1 st protective layer 42 side of the optical laminate 11.
The polarizing layer 41 may be a polarizing layer in which a dichroic dye such as iodine is adsorbed and oriented on a polyvinyl alcohol resin film, and the PVA resin film is usually a stretched polyvinyl alcohol resin film. The polarizing layer 41 may be a polarizing layer in which a dichroic dye is aligned in a layer obtained by curing a liquid crystal compound. The 1 st protective layer 42 and the 2 nd protective layer 43 are layers for protecting the polarizing layer 41. The 1 st retardation layer 21 is a liquid crystal layer containing a liquid crystal compound. The liquid crystal layer may be a cured layer formed by polymerizing a polymerizable liquid crystal compound, for example. The optical laminate 11 may have an alignment layer for aligning the liquid crystal compound forming the 1 st retardation layer 21 on the side of the 1 st retardation layer 21 opposite to the adhesive layer 31.
The optical laminate 11 has the adhesive-lacking portion 5 at an end portion in the surface direction W. As shown in fig. 1, the missing portion 5 is formed such that, in a cross section passing through a portion where the 1 st retardation layer 21 and the adhesive layer 31 overlap in the lamination direction orthogonal to the plane direction W, the position of the innermost end of the end portion of the adhesive layer 31 is located inward in the range of the length of the distance L1 with respect to the position of the outermost end of the end portion of the 1 st retardation layer 21. In the present specification, the innermost end position of the end portion of the pressure-sensitive adhesive layer 31 refers to the innermost end position of the end portion of the pressure-sensitive adhesive layer 31 in the plane direction W, and the outermost end position of the end portion of the 1 st retardation layer 21 refers to the outermost end position of the end portion of the 1 st retardation layer 21 in the plane direction W.
The distance L1 of the glue-lacking portion 5 is greater than 0 μm, may be 0.2 μm or more, may be 0.5 μm or more, may be 2 μm or more, and is 10 μm or less, preferably 8 μm or less, may be 5 μm or less, and may be less than 5 μm.
The 1 st retardation layer 21 included in the optical laminate 11 is a liquid crystal layer containing a liquid crystal compound. It is presumed that the 1 st retardation layer 21 as such a liquid crystal layer is likely to be deteriorated since the liquid crystal compound is an organic compound when exposed to external light including ultraviolet rays during use of the optical laminate 11 or the like. It is considered that if the 1 st retardation layer 21 is deteriorated, the retardation characteristics inherently possessed by the 1 st retardation layer 21 are lost, and the color tone of the reflected light of the optical layered body 11 is changed. When the optical laminate 11 is applied to a display device or the like, the 1 st retardation layer 21 side is generally the display device side, and the polarizing plate 40 side is exposed to the outside, so that the polarizing plate 40 side of the 1 st retardation layer 21 is easily exposed to outside light including ultraviolet rays. In the present embodiment, the distance L1 of the glue-missing part 5 of the optical laminate 11 is set to 10 μm or less, thereby reducing the area not covered with the pressure-sensitive adhesive layer 31 as much as possible. This suppresses deterioration of the 1 st retardation layer 21 by external light, and it is presumed that deterioration in uniformity of color tone of reflected light in the plane can be suppressed even when the optical layered body 11 is exposed to external light.
The distance L1 of the missing portion 5 can be calculated by measuring the profile of the cross section of the optical laminate 11 using a laser microscope and calculating the distance based on the position of the innermost end of the end portion of the pressure-sensitive adhesive layer 31 and the position of the outermost end of the end portion of the 1 st retardation layer 21 determined from the profile. When the outer shape of the optical laminate 11 has a linear side and the adhesive-lacking portion 5 is formed on the side, the cross section of the optical laminate 11 is a cross section obtained by cutting in a direction perpendicular to the side at the position of the side where the adhesive-lacking portion 5 is formed. When the outer shape of the optical laminate 11 has a curved portion and the missing portion 5 is formed in the curved portion, the cross section of the optical laminate 11 is a cross section taken along a direction perpendicular to a position P where the missing portion 5 is formed and passing through a tangent line in the plane direction of the optical laminate 11 at the position P where the missing portion 5 is formed.
The shape of the adhesive-lacking portion 5 of the optical layered body 11 is not particularly limited, and the end portion of the pressure-sensitive adhesive layer 31 may have a tapered shape as shown in fig. 1, may be parallel to the lamination direction orthogonal to the plane direction W, or may be formed in a zigzag shape, an uneven shape, a curved shape, or the like. As shown in fig. 1, the adhesive layer 31 of the absent part 5 preferably has a tapered shape, in which the position of the end of the 1 st retardation layer 21 side surface of the adhesive layer 31 is located on the outer side in the plane direction with respect to the position of the end of the polarizing plate 40 side surface. It is considered that, since the range of the surface of the 1 st retardation layer 21 exposed without providing the pressure-sensitive adhesive layer 31 can be reduced at the end of the 1 st retardation layer 21, when the optical laminate 11 is exposed to external light, deterioration in uniformity of color tone of reflected light in the plane can be easily suppressed.
The optical layered body 11 may have a square outer shape in the planar direction (in a plan view) or a square outer shape having a cutout portion on at least one side. In the present specification, the square shape means a rectangle or a square shape, and includes a shape in which at least 1 of 4 corners of the square shape is a circular arc.
The boundary between the 2 sides that are continuous across the arc portion is a position that bisects the contour length of the arc portion. The outline length of the circular arc portion is set to a length between end portions on the circular arc portion side of linear portions each of which is included in each of 2 sides continuous across the circular arc portion. The notch may be a concave shape recessed toward the facing side, and the concave shape may be U-shaped or V-shaped.
The notch portion may be formed on one side of the square shape, or may be formed on 2 or more sides. The notch portion may be provided in a region where at least 1 of a headphone, a speaker, a camera lens, an LED lamp, a proximity sensor, an illuminance sensor, a fingerprint authentication sensor, an operation button, and the like is provided, for example, in a smartphone or the like.
When the optical layered body 11 has a square shape, the adhesive-lacking portion 5 is preferably formed on at least one side of the square shape, may be formed on two or more sides, or may be formed on all four sides. The adhesive-lacking portion 5 may be formed continuously or discontinuously over the entire length of the side, or may be formed in a part of the side. When the cut portion 5 is continuously formed on the side, a region in which the cut portion 5 is continuously formed is preferably included in 50% or more of the entire length of the side, more preferably 70% or more, and even more preferably 90% or more of the entire length of the side. When the adhesive-lacking portion 5 is continuously formed over the above range, the change in the color tone of the reflected light tends to be conspicuous, but the distance L1 of the adhesive-lacking portion 5 is set to 10 μm or less in the optical layered body 11 as described above, so that the change in the color tone of the reflected light at the end portion can be suppressed. This makes it easy to suppress deterioration in uniformity of color tone of the reflected light in the plane even when the optical layered body 11 is exposed to external light.
The optical laminate 11 may have a hole portion penetrating the entire optical laminate 11 in the lamination direction. The hole may be circular, or may be polygonal such as elliptical, quadrangular, or hexagonal, or at least 1 corner of the polygonal shape may be a circular arc. The glue lacking portion 5 may be formed at a circumferential portion of the hole portion. The missing part formed in the hole may be formed in at least a part of the circumferential portion of the hole, or may be formed in the entire circumferential portion of the hole. For example, in a smartphone or the like, the hole may be provided in a region where a camera lens or the like is provided.
When the optical laminate 11 has a rectangular shape having a pair of long sides and a pair of short sides, and the absorption axis direction of the polarizing layer 41 forms an angle of 45 ° ± 10 ° with respect to the long sides, the adhesive-lacking portion 5 is preferably formed on at least one of the pair of long sides and at least one of the pair of short sides. In the present specification, the angle refers to an acute angle among angles formed between the absorption axis direction and the long side. The adhesive-lacking portion 5 may be formed on both of the pair of long sides, or may be formed on both of the pair of short sides. In some cases, the polarizing layer 41 of the optical laminate 11 expands and contracts in the absorption axis direction thereof with an environmental change such as a change in humidity, and in this case, the expansion and contraction stress of the polarizing layer 41 tends to concentrate on the sides located at both ends in the absorption axis direction. Therefore, in the optical laminate 11 in which the absorption axis direction and the long side are in a relationship of 45 ° ± 10 °, the stretching stress of the polarizing layer 41 concentrates on both the long side and the short side, and the color tone of the reflected light of the 1 st retardation layer 21 is likely to change. By providing the adhesive-lacking portion 5 on at least one of the pair of long sides and at least one of the pair of short sides as described above, even when the polarizing layer 41 of the optical laminate 11 expands and contracts, the expansion and contraction stress can be dispersed in a portion where the expansion and contraction stress of the polarizing layer 41 is likely to concentrate. It is considered that, even when the polarizing layer 41 expands and contracts, deterioration in uniformity of color tone of the in-plane reflected light can be effectively suppressed. The angle formed by the absorption axis direction of the polarizing layer 41 with respect to the long side may be 45 ° ± 5 °, 45 ° ± 2 °, or 45 °.
When the optical laminate 11 has a rectangular shape having a pair of long sides and a pair of short sides, and the absorption axis direction of the polarizing layer 41 forms an angle of 0 ° ± 10 ° with respect to the long sides, the adhesive-lacking portion 5 is preferably formed on at least one of the pair of short sides. In the present specification, the angle refers to an acute angle among angles formed between the absorption axis direction and the long side. The glue-lacking portion 5 may be formed on both of the pair of short sides. In the optical laminate 11 in which the absorption axis direction and the long side are in the relationship of 0 ° ± 10 °, it is considered that the stretching stress of the polarizing layer 41 is likely to concentrate on the short side and the color tone of the reflected light of the 1 st retardation layer 21 is likely to change for the above-described reason. Therefore, it is considered that, by providing the adhesive lacking portion 5 on at least one of the pair of short sides, even when the polarizing layer 41 expands or contracts, deterioration in uniformity of color tone of the reflected light in the plane can be effectively suppressed. The angle formed by the absorption axis direction of the polarizing layer 41 with respect to the long side may be 0 ° ± 5 °, 0 ° ± 2 °, or 0 °.
When the optical laminate 11 has a rectangular shape having a pair of long sides and a pair of short sides, and the absorption axis direction of the polarizing layer 41 forms an angle of 0 ° ± 10 ° with respect to the short sides, the adhesive-lacking portion 5 is preferably formed on at least one of the pair of long sides. In the present specification, the angle refers to an acute angle among angles formed by the absorption axis direction and the short side. The adhesive-lacking portion 5 may be formed on both of the pair of long sides. In the optical laminate 11 in which the absorption axis direction and the short side are in the relationship of 0 ° ± 10 °, it is considered that the stretching stress of the polarizing layer 41 is likely to concentrate on the long side and the color tone of the reflected light of the 1 st retardation layer 21 is likely to change for the above-described reason. Therefore, it is considered that, by providing the glue-lacking portion 5 on at least one of the pair of long sides, even when the polarizing layer 41 expands and contracts, deterioration in uniformity of color tone of the reflected light in the plane can be effectively suppressed. The angle formed by the absorption axis direction of the polarizing layer 41 with respect to the short side may be 0 ° ± 5 °, 0 ° ± 2 °, or 0 °.
The adhesive layer 31 preferably contains an ultraviolet absorber. By including an ultraviolet absorber in the region covered with the adhesive layer 31 in the 1 st retardation layer 21, deterioration of the 1 st retardation layer 21 by external light can be further suppressed. Therefore, when the optical layered body 11 is exposed to external light, the uniformity of the color tone of the reflected light in the plane can be further made difficult to deteriorate.
In the optical laminate 11 shown in fig. 1, the 1 st retardation layer 21 may be an a plate or a C plate. In the optical laminate 11 shown in fig. 1, the circularly polarizing plate can be produced by using the 1 st retardation layer 21 as an 1/4 wavelength plate.
The optical laminate 11 shown in fig. 1 can be produced, for example, by preparing the polarizing plate 40 and the 1 st retardation layer 21, applying or transferring an adhesive to at least one of the 1 st protective layer 42 side of the polarizing plate 40 and the 1 st retardation layer 21, and laminating the polarizing plate 40 and the 1 st retardation layer 21 via the adhesive layer. When the 1 st retardation layer 21 is a liquid crystal layer, the 1 st retardation layer 21 of the 1 st retardation layer with a substrate layer, in which the 1 st retardation layer 21 is formed on the 1 st substrate layer so as to be peelable, may be laminated with the polarizing plate 40 via an adhesive agent, and then the 1 st substrate layer may be peeled.
The method of forming the adhesive-lacking portion 5 of the optical layered body 11 is not particularly limited, and for example, the adhesive-lacking portion can be formed by adjusting the application range and transfer position of the adhesive layer for forming the adhesive layer 31. In the case of forming the pressure-sensitive adhesive layer 31 by transfer, a portion to be the absent portion 5 may be formed in advance in a pressure-sensitive adhesive layer formed on a release film or the like prepared for transfer use, and the pressure-sensitive adhesive layer having the portion to be the absent portion 5 may be transferred onto the polarizing plate 40 or the 1 st retardation layer 21.
In order to form the pressure-sensitive adhesive layer formed on the release film or the like as the portion to be the adhesive-lacking portion 5, for example, as shown in fig. 3(a) to (b), the pressure-sensitive adhesive layer 60 with the release film having the pressure-sensitive adhesive layer 61 formed on the release film 62 is prepared, and the pressure-sensitive adhesive layer 60 with the release film is cut by a single-blade cutter 65 from the pressure-sensitive adhesive layer 61 side. In the process of cutting the adhesive layer 60 with a release film as described above, the adhesive layer 61 may be pushed in a tapered shape by using the surface on the side where the blade is formed, out of the two surfaces of the single-blade cutting blade 65, to form an adhesive layer whose end portion becomes a tapered shape.
(modification example)
The optical film of the present embodiment may be modified as described below, or may be implemented by combining the structures and steps of the embodiment and the modified examples thereof.
(modification 1)
In the above-described embodiment, the optical laminate 11 including the polarizing plate 40 having the 1 st protective layer 42 and the 2 nd protective layer 43 on both surfaces of the polarizing layer 41 has been described, but the present invention is not limited thereto. The polarizing plate may include a polarizing layer 41 and one of a 1 st protective layer 42 and a 2 nd protective layer 43. The optical laminate 11 may not include the 1 st protective layer 42 and the 2 nd protective layer 43.
(modification 2)
When the optical laminate 11 shown in fig. 1 is a circularly polarizing plate, the circularly polarizing plate can be used for antireflection purposes of an organic electroluminescence (organic EL) display device, for example. In this case, the optical laminate 11 is used by being bonded to the visible side of the optical display element of the organic EL display device. Therefore, the optical laminate 11 may have an adhesive layer for an optical display element for bonding to an optical display element on the side of the 1 st retardation layer 21 opposite to the adhesive layer 31.
(modification 3)
In the above embodiment, the optical laminate 11 including the 1 st retardation layer 21 was described, but the present invention is not limited thereto, and for example, an optical laminate shown in fig. 2 may be used. Fig. 2 is a cross-sectional view schematically showing another example of the optical laminate of the present embodiment. Hereinafter, the same members as those described above are denoted by the same reference numerals, and the description thereof will be omitted. The optical laminate 12 shown in fig. 2 includes a polarizing plate 40, an adhesive layer 31, a 1 st retardation layer 21, an adhesive layer 35, and a 2 nd retardation layer 22 in this order. The adhesive layer 35 may be an adhesive layer formed using an adhesive or an adhesive layer formed using an adhesive. The 2 nd retardation layer 22 may be a retardation film, or may be a liquid crystal layer containing a liquid crystal compound such as a polymerizable liquid crystal compound. In the case where the 2 nd retardation layer 22 is a liquid crystal layer, the optical laminate 12 may have an alignment layer for aligning the liquid crystal compound forming the 2 nd retardation layer 22 on the side of the 2 nd retardation layer 22 opposite to the adhesive layer 35.
In the optical laminate 12, the circularly polarizing plate can be produced by, for example, setting the 1 st retardation layer 21 to be an 1/2 wavelength plate and the 2 nd retardation layer 22 to be a 1/4 wavelength plate; the 1 st retardation layer 21 was an 1/4-wavelength plate of reverse wavelength dispersion, and the 2 nd retardation layer 22 was a positive C plate; the 1 st retardation layer 21 was a positive C plate, and the 2 nd retardation layer 22 was an 1/4 wavelength plate having reverse wavelength dispersion. When the combination of the 1 st retardation layer 21 and the 2 nd retardation layer 22 is an 1/2 wavelength plate or a 1/4 wavelength plate, the slow axis direction of the 1/2 wavelength plate may be 70 ° to 80 ° and the slow axis direction of the 1/4 wavelength plate may be 10 ° to 20 ° with respect to the absorption axis direction of the polarizing layer 41. In the case where the combination of the 1 st retardation layer 21 and the 2 nd retardation layer 22 is the 1/4 wavelength plate and the positive C plate having the reverse wavelength dispersibility, the slow axis direction of the 1/4 wavelength plate may be set to 40 ° to 50 ° with respect to the absorption axis direction of the polarizing layer 41. When the optical laminate 12 as a circularly polarizing plate is used for antireflection of an organic EL display device, the optical laminate 12 shown in fig. 2 may have an adhesive layer for an optical display element on the side opposite to the adhesive layer 35 of the 2 nd retardation layer 22.
The optical laminate 12 shown in fig. 2 can be formed, for example, by preparing a retardation layer laminate in which the 1 st retardation layer 21 and the 2 nd retardation layer 22 are laminated via an adhesive layer 35, and a polarizing plate 40, applying or transferring an adhesive to at least one of the 1 st protective layer 42 side of the polarizing plate 40 and the 1 st retardation layer 21 side of the retardation layer laminate, and bonding the polarizing plate 40 and the retardation layer laminate via the adhesive. When both the 1 st retardation layer 21 and the 2 nd retardation layer 22 are liquid crystal layers, the optical laminate 12 can be obtained as follows, for example. First, a retardation layer laminate is obtained by laminating a 1 st retardation layer 21 of a 1 st retardation layer with a base layer, in which the 1 st retardation layer 21 is formed on a 1 st base layer so as to be peelable, and a 2 nd retardation layer 22 of a 2 nd retardation layer with a base layer, in which a 2 nd retardation layer 22 is formed on a 2 nd base layer so as to be peelable, via an adhesive layer. Then, the 1 st base material layer is peeled off from the retardation layer laminate, and the 1 st retardation layer 21 side and the 1 st protective layer 42 side of the polarizing plate 40 are laminated via an adhesive, and then the 2 nd base material layer is peeled off, whereby the optical laminate 12 shown in fig. 2 can be obtained.
The following describes in detail the matters common to the above-described embodiment and its modifications.
(polarizing layer)
The polarizing layer may be a polarizing layer in which a dichroic dye such as iodine is adsorbed and oriented in a polyvinyl alcohol resin film (hereinafter, may be referred to as a "PVA resin film"), or a polarizing layer in which a dichroic dye is oriented in a layer obtained by curing a liquid crystal compound.
The PVA resin film is formed using a polyvinyl alcohol resin. The polyvinyl alcohol resin is a resin containing 50 mass% or more of a constituent unit derived from vinyl alcohol. As the polyvinyl alcohol resin, a resin obtained by saponifying a polyvinyl acetate resin can be used. The saponification degree of the polyvinyl acetate resin can be determined in accordance with JIS K6727 (1994), and can be, for example, 80.0 to 100.0 mol%.
Examples of the polyvinyl acetate resin include polyvinyl acetate which is a homopolymer of vinyl acetate, and a copolymer of vinyl acetate and another monomer copolymerizable therewith. Examples of the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth) acrylamides having an ammonium group. In the present specification, "(meth) acrylic" means at least 1 selected from acrylic and methacrylic. The same applies to other terms to which "(methyl)" is attached.
An example of the PVA-based resin film may be an unstretched film obtained by forming a polyvinyl alcohol-based resin film, or a stretched film obtained by stretching the unstretched film. When the PVA-based resin film is a stretched film, the film is preferably a stretched film uniaxially stretched in the longitudinal direction, and is preferably a stretched film subjected to dry stretching. The PVA-based resin film is usually stretched at a stretch ratio of 1.1 to 8 times.
Examples of the dichroic dye adsorbed and aligned on the PVA-based resin film include iodine and organic dyes. Examples of organic dyes include Red BR (Red BR), Red LR (Red LR), Red R (Red R), pink LB (PinklB), ruby Red BL (Rubine BL), Red GS (Bordeaux GS), sky Blue LG (sky Blue LG), lemon Yellow, Blue BR (Blue BR), Blue 2R (Blue 2R), Tibetan Blue RY (Navy RY), green LG (Green LG), purple LB (Violet) LB, purple B Violet B, black H (Black H), black B (Black B), black GSP (Black GSP), Yellow 3G (Yellow super 3G), Yellow R (Yellow R), Orange LR (Orange LR), Orange GL 3R (Orange 3R), scarlet (scarlet), scarlet L ScarKG, Red GL (Red), Red brilliant L (Bright), brilliant Red GL BK, brilliant Red GL Blue BK, brilliant Blue GL (Red), brilliant Blue GL), brilliant Blue LG (Red GL), brilliant Blue LG (sky Blue LG), lemon Yellow LB (Violet LB), lemon Yellow B (Blue BR), Blue BR, Blue 2R (Blue G), brilliant white G, brilliant white GSP (Black GSP, brilliant white GL 3G, brilliant white, Direct sky blue, direct Fast orange S, Fast Black (Fast Black). The dichroic dye may be used alone in 1 kind, or may be used in combination in 2 or more kinds.
Examples of the polarizing layer in which the dichroic dye is aligned in the layer obtained by curing the liquid crystal compound include a polarizing layer using a cured layer obtained by aligning the dichroic dye in a polymerizable liquid crystal compound and polymerizing the polymerizable liquid crystal compound. Such a polarizing layer can be formed by applying a polarizing layer forming composition containing a liquid crystal compound and a dichroic dye onto a base film, and polymerizing and curing the liquid crystal compound while maintaining the liquid crystal state. The polarizing layer obtained as described above is in a state of being laminated on a base film, and the base film can be used as a protective layer of the polarizing layer as it is. Alternatively, a polarizing layer with a base film, which can be peeled off from the polarizing layer, may be laminated on the 1 st retardation layer via the pressure-sensitive adhesive layer 31, and then the base film may be peeled off.
The liquid crystal compound is preferably one having a property of exhibiting a liquid crystal state, and particularly one having a high-dimensional alignment such as a smectic phase, because it can exhibit high polarization performance.
In addition, it is also preferable that the liquid crystal compound has a polymerizable functional group. The dichroic dye is a dye that exhibits dichroism by being aligned together with a liquid crystal compound, and may have liquid crystallinity itself or may have a polymerizable functional group. Any compound in the composition for forming a polarizing layer containing a liquid crystal compound has a polymerizable functional group.
Examples of dichroic dyes that can be used in a polarizing layer using a liquid crystal compound include acridine dyes, oxazine dyes, cyanine dyes, naphthalene dyes, azo dyes, anthraquinone dyes, and the like, and among them, azo dyes are preferred. Examples of the azo dye include monoazo dye, disazo dye, trisazo dye, tetraazo dye, and stilbenylazo dye, and disazo dye and trisazo dye are more preferable. The dichroic dye may be used alone in 1 kind, or may be used in combination in 2 or more kinds.
The composition for forming a polarizing layer may contain a solvent, a polymerization initiator such as a photopolymerization initiator, a photosensitizer, a polymerization inhibitor, a dispersant, a leveling agent, a stabilizer, a surfactant, a crosslinking agent, a silane coupling agent, and the like. Known polymerizable liquid crystal compounds, dichroic dyes, solvents, polymerization initiators, photosensitizers, polymerization inhibitors, and the like contained in the composition for forming a polarizing layer can be used. The polymerizable liquid crystal compound may be the same compound as exemplified as the polymerizable liquid crystal compound used for obtaining the 1 st retardation layer and the 2 nd retardation layer described later.
The thickness of the polarizing layer 41 is usually 2 to 40 μm, and is preferably 30 μm or less, and more preferably 20 μm or less, from the viewpoint of making the polarizing layer thinner. The polarizing layer as a layer in which a dichroic dye is aligned in a liquid crystal compound may be formed to have a smaller thickness than a polarizing layer in which a dichroic dye such as iodine is adsorbed and aligned in a PVA-based resin film. The thickness of the polarizing layer using the liquid crystal compound may be, for example, 0.5 to 5 μm, preferably 1 to 4 μm.
The visibility-correcting monomer transmittance Ty of the polarizing layer 41 is preferably 40 to 47%, and more preferably 41 to 45%, in consideration of the balance with the visibility-correcting polarization degree Py. The visibility correction polarization degree Py is preferably 99.9% or more, and more preferably 99.95% or more. Ty and Py can be obtained by correcting the transmittance and the degree of polarization obtained by using an absorption photometer with an integrating sphere by visibility with a 2-degree field of view (C light source) according to JIS Z8701.
(polarizing plate)
The polarizing plate is a member in which protective layers (a 1 st protective layer and a 2 nd protective layer) are laminated on one or both surfaces of a polarizing layer via a known adhesive layer or adhesive layer. The thickness of the polarizing plate may be, for example, 2 μm or more and 300 μm or less, and may be 10 μm or more, and may be 150 μm or less, 120 μm or less, and 80 μm or less.
As the protective layer, for example, a film made of a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, water resistance, isotropy, stretchability, and the like is used. Specific examples of such thermoplastic resins include cellulose resins such as triacetyl cellulose; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; polyether sulfone resin; polysulfone resin; a polycarbonate resin; polyamide resins such as nylon and aromatic polyamide; a polyimide resin; polyolefin resins such as polyethylene, polypropylene, and ethylene/propylene copolymers; cyclic polyolefin resins having a ring system and a norbornene structure (also referred to as norbornene-based resins); a (meth) acrylic resin; a polyarylate resin; a polystyrene resin; a polyvinyl alcohol resin; and mixtures thereof. When protective layers are laminated on both surfaces of the polarizing layer, the resin compositions of the two protective layers may be the same or different. The film made of a thermoplastic resin may be subjected to a surface treatment (for example, corona treatment) to improve adhesion to the polarizing layer, or may be formed with a thin layer such as a primer layer (also referred to as an undercoat layer).
The protective layer may be, for example, a layer obtained by stretching the above thermoplastic resin, or may be an unstretched layer (hereinafter, sometimes referred to as "unstretched resin"). Examples of the stretching treatment include uniaxial stretching and biaxial stretching.
The thickness of the protective layer is preferably 3 μm or more, and more preferably 5 μm or more. The thickness of the protective layer is preferably 50 μm or less, and more preferably 30 μm or less. The upper limit value and the lower limit value may be arbitrarily combined. The thinner the thickness of the polarizing plate, the lower the rigidity, and the more easily the polarizing layer is affected by the stretching stress. Therefore, in an optical laminate having a polarizing plate with a protective layer having a small thickness, the polarizing plate is easily affected by the stretching stress of the polarizing layer at its end portion, and the uniformity of the color tone of the in-plane reflected light tends to be easily deteriorated by environmental changes such as humidity changes. Therefore, in such an optical laminate, it is considered that deterioration in uniformity of color tone of reflected light in the plane can be effectively suppressed even when environmental changes occur by setting the distance L1 of the amount of missing glue to 3 μm or more as described above.
The surface of the protective layer on the side opposite to the polarizing layer may have a surface treatment layer, and for example, may have a hard coat layer, an antireflection layer, an adhesion-preventing layer, an antiglare layer, a diffusion layer, or the like. The surface treatment layer may be another layer stacked on the protective layer, or may be a layer formed by surface-treating the surface of the protective layer.
(retardation layer 1)
The 1 st retardation layer is a liquid crystal layer containing a liquid crystal compound. The type of the liquid crystal compound forming the liquid crystal layer is not particularly limited, and a rod-like liquid crystal compound, a discotic liquid crystal compound, and a mixture thereof can be used. The liquid crystal layer can be formed by applying a liquid crystal layer-forming composition containing a liquid crystal compound, a solvent, and various additives used as needed onto the alignment layer to form a coating film, and curing (hardening) the coating film to form a liquid crystal layer as a cured layer of the liquid crystal compound. Alternatively, the liquid crystal layer may be formed by applying the composition for forming a liquid crystal layer to the 1 st base material layer to form a coating film and stretching the coating film together with the 1 st base material layer. The composition for forming a liquid crystal layer may further contain a polymerization initiator, a reactive additive, a leveling agent, a polymerization inhibitor, and the like in addition to the liquid crystal compound and the solvent.
Known liquid crystal compounds, solvents, polymerization initiators, reactive additives, leveling agents, polymerization inhibitors, and the like can be used as appropriate.
The 1 st base material layer on which the liquid crystal layer is formed is preferably a film made of a resin material. As the resin material, for example, a resin material excellent in transparency, mechanical strength, thermal stability, stretchability, and the like is used. Specific examples thereof include polyolefin resins such as polyethylene and polypropylene; cyclic polyolefin resins such as norbornene polymers; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; (meth) acrylic resins such as (meth) acrylic acid and polymethyl (meth) acrylate; cellulose ester resins such as triacetyl cellulose, diacetyl cellulose, and cellulose acetate propionate; vinyl alcohol resins such as polyvinyl alcohol and polyvinyl acetate; a polycarbonate-based resin; a polystyrene-based resin; a polyarylate-based resin; a polysulfone-based resin; a polyether sulfone-based resin; a polyamide resin; a polyimide-based resin; a polyether ketone resin; polyphenylene sulfide-based resin; a polyphenylene ether resin; and mixtures, copolymers, and the like thereof. Among these resins, any one of cyclic polyolefin resins, polyester resins, cellulose ester resins, and (meth) acrylic resins, or a mixture thereof is preferably used.
The 1 st base material layer may be a single layer or may have a multilayer structure of 2 or more layers. In the case of having a multilayer structure, the types of resins forming the respective layers may be the same as or different from each other. The thickness of the 1 st base material layer is not particularly limited, but is generally preferably 1 to 300 μm, more preferably 10 to 200 μm, and further preferably 30 to 120 μm in view of strength, handling properties, and the like.
The alignment layer has an alignment regulating force for aligning a liquid crystal compound such as a polymerizable liquid crystal compound contained in a liquid crystal layer formed thereon in a desired direction. Examples of the alignment layer include an alignment polymer layer formed using an alignment polymer, a photo-alignment polymer layer formed using a photo-alignment polymer, and a groove alignment layer having a concave-convex pattern or a plurality of grooves (grooves) on the surface of the layer. The thickness of the alignment layer is usually 10 to 500nm, preferably 10 to 200 nm.
(retardation layer 2)
The 2 nd retardation layer may be a retardation film or a liquid crystal layer. The retardation film may be any film exhibiting optical anisotropy, and examples thereof include a stretched film obtained by stretching a film made of polyvinyl alcohol, polycarbonate, polyester, polyarylate, polyimide, polyolefin, polycycloolefin, polystyrene, polysulfone, polyethersulfone, polyvinylidene fluoride/polymethyl methacrylate, acetyl cellulose, an ethylene-vinyl acetate copolymer saponified product, polyvinyl chloride, or the like by about 1.01 to 6 times.
When the 2 nd retardation layer is a liquid crystal layer, the same liquid crystal compound as that used for obtaining the 1 st retardation layer can be used, and the 2 nd retardation layer can be formed by the same method as that for forming the 1 st retardation layer.
(adhesive layer)
The adhesive layer is a layer formed using an adhesive. The pressure-sensitive adhesive used in the present specification is a material exhibiting adhesiveness by attaching itself to an adherend such as an optical film or a liquid crystal layer, and is a so-called pressure-sensitive adhesive. As the binder, conventionally known binders having excellent optical transparency can be used without particular limitation, and for example, binders having a base polymer such as an acrylic, urethane, silicone, or polyvinyl ether can be used. The thickness of the pressure-sensitive adhesive layer may be 3 μm or more, or 5 μm or more, or 35 μm or less, or 30 μm or less.
The pressure-sensitive adhesive layer may contain, in addition to the above-mentioned ultraviolet absorbers, additives such as antistatic agents using ionic compounds and the like, solvents, crosslinking catalysts, tackifying resins (tackifiers), plasticizers, softening agents, dyes, pigments, inorganic fillers, and the like.
(adhesive layer)
The adhesive layer may be formed using an adhesive layer, an adhesive layer formed using an adhesive, or a combination thereof, and is usually 1 layer, but may be 2 or more layers. When the adhesive layer includes 2 or more layers, the layers may be formed of the same material or different materials. The adhesive layer may be formed using the adhesive described above.
As the adhesive usable for the adhesive layer, for example, a conventionally known adhesive such as a water-based adhesive or an active energy ray-curable adhesive can be used without particular limitation. Examples of the aqueous adhesive include a polyvinyl alcohol resin aqueous solution and an aqueous two-part type urethane emulsion adhesive. The active energy ray-curable adhesive is an adhesive that is cured by irradiation with an active energy ray such as ultraviolet ray, and examples thereof include an adhesive containing a polymerizable compound and a photopolymerization initiator, an adhesive containing a photoreactive resin, and an adhesive containing a binder resin and a photoreactive crosslinking agent. Examples of the polymerizable compound include photopolymerizable monomers such as a photocurable epoxy monomer, a photocurable acrylic monomer, and a photocurable urethane monomer, and oligomers derived from these monomers. Examples of the photopolymerization initiator include initiators containing active species that generate neutral radicals, anionic radicals, cationic radicals, and the like by irradiation with active energy rays such as ultraviolet rays.
[ examples ]
The present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these examples. In examples and comparative examples, "%" and "parts" are mass% and parts by mass unless otherwise specified.
[ production of polarizing plate ]
As the 1 st protective layer, a triacetyl cellulose film having a thickness of 20 μm was prepared. As the 2 nd protective layer, a 29 μm thick norbornene resin film having a hard coat layer formed on one surface thereof was prepared. As the polarizing layer, a polarizing layer was prepared in which iodine as a dichroic dye was adsorbed and oriented on a PVA-based resin film. The thickness of the polarizing layer was 8 μm.
Further, 3 parts by weight of carboxyl-modified polyvinyl alcohol [ trade name "KL-318" obtained from Kuraray co., ltd.) was dissolved in 100 parts by weight of water, and 1.5 parts by weight of a polyamide epoxy additive [ trade name "Sumirez Resin (registered trademark) 650 (30)" obtained from tiangang chemical industries, ltd.) and an aqueous solution having a solid content concentration of 30% by weight ] was added as a water-soluble epoxy Resin to the aqueous solution to prepare an aqueous adhesive.
The 1 st protective layer was subjected to saponification treatment, and the surface of the 2 nd protective layer on the norbornene resin film side and both surfaces of the polarizing layer were subjected to corona treatment. A 1 st protective layer was attached to one surface of the polarizing layer via the water-based adhesive obtained in the above-described manner, and the opposite side (norbornene-based resin film side) of the 2 nd protective layer to the hard coat layer was attached to the other surface of the polarizing layer via the same water-based adhesive, followed by drying treatment to prepare a polarizing plate. The obtained polarizing plate was cut into a rectangular shape so that the absorption axis of the polarizing layer was 45 ° with respect to the longitudinal direction.
[ production of retardation layer 1]
(preparation of composition for Forming horizontal alignment layer)
The following components were mixed, and the resulting mixture was stirred at a temperature of 80 ℃ for 1 hour, thereby obtaining a composition for forming a horizontal alignment layer.
Photo-alignment material (5 parts) (weight average molecular weight: 30000):
solvent (95 parts): cyclopentanone
(preparation of composition for Forming horizontally oriented liquid Crystal layer)
The following components were mixed, and N-methyl-2-pyrrolidone (NMP) was further added so that the solid content concentration became 13%, and the mixture was stirred at 80 ℃ for 1 hour, thereby obtaining a composition for forming a horizontally aligned liquid crystal layer. The following polymerizable liquid crystal compound a was synthesized by the method described in jp 2010-31223 a, and the following polymerizable liquid crystal compound B was synthesized by the method described in jp 2009-173893 a.
Polymerizable liquid crystal compound a (90 parts):
polymerizable liquid crystal compound B (10 parts):
polymerization initiator (6 parts):
2-dimethylamino-2-benzyl-1- (4-morpholinophenyl) -1-butanone (Irgacure 369, BASFJAPAN)
(preparation of retardation layer 1)
A cycloolefin resin (COP) film (ZF-14-50, manufactured by ZEON K.K.) was subjected to corona treatment. The horizontally oriented layer-forming composition obtained in the above-described manner was applied to the corona-treated surface of the COP film by a bar coater, and dried at 80 ℃ for 1 minute. The coating film was irradiated with polarized UV light (SPOT CURE SP-9, manufactured by USHIO Motor Co., Ltd.) so that the cumulative amount of light at a wavelength of 313nm was 100mJ/cm2The polarized light UV exposure was performed at an axial angle of 45 ° to obtain a horizontally aligned layer.
Next, the composition for forming a horizontally aligned liquid crystal layer obtained in the above-described manner was applied to the horizontally aligned layer using a bar coater, and dried at 120 ℃ for 1 minute. The coating film was irradiated with ultraviolet light (cumulative light amount at 365nm in nitrogen atmosphere: 500 mJ/cm) using a high pressure mercury lamp ("UNICURE VB-15201 BY-A", manufactured BY USHIO Motor Co., Ltd.)2) Thereby forming a 1 st retardation layer as a horizontally aligned liquid crystal layer. The 1 st retardation layer was an 1/4 wavelength plate showing reverse wavelength dispersion.
[ production of retardation layer 2 ]
(preparation of composition for Forming vertical alignment layer)
As a composition for forming a vertical alignment layer, sunverse 610 (manufactured by nippon chemical industries) was prepared.
(preparation of composition for Forming Vertically aligned liquid Crystal layer)
The following components were mixed, and cyclopentanone was further added to the mixture so that the solid content concentration became 13%, to obtain a composition for forming a vertically aligned liquid crystal layer.
Polymerizable liquid crystal compound C (100 parts):
paliocolor (registered trademark) LC242 (manufactured by BASF corporation)
Leveling agent (0.1 part):
f-556 (manufactured by DIC Co., Ltd.)
Polymerization initiator (3 parts):
irgacure 369(Ciba Specialty Chemicals Co., Ltd.)
(preparation of retardation layer 2)
A cycloolefin resin (COP) film (ZF-14-50, manufactured by ZEON K.K.) was subjected to corona treatment. The composition for forming a vertically aligned layer obtained in the above-described manner was applied to the corona-treated surface of the COP film by a bar coater, and dried at 80 ℃ for 1 minute to obtain a vertically aligned layer. Next, the composition for forming a vertically aligned liquid crystal layer obtained in the above-described manner was applied to a vertical alignment layer by a bar coater, and dried at 90 ℃ for 120 seconds. The coating film was irradiated with ultraviolet light (cumulative light amount at a wavelength of 365nm under a nitrogen atmosphere: 500 mJ/cm) using a high pressure mercury lamp ("UNICURE VB-15201 BY-A", manufactured BY USHIO Motor Co., Ltd.)2) Thereby forming a 2 nd retardation layer as a vertically aligned liquid crystal layer. The 2 nd retardation layer is a positive C plate satisfying the relationship nx ≈ ny < nz.
[ production of retardation layer laminate ]
The surface of the 1 st retardation layer produced in the above-described operation on the side opposite to the COP film and the surface of the 2 nd retardation layer produced in the above-described operation on the side opposite to the COP film were subjected to corona treatment. The corona-treated surfaces (the 1 st retardation layer surface and the 2 nd retardation layer surface) were bonded to each other with an ultraviolet-curable adhesive therebetween, and then the ultraviolet-curable adhesive was cured by irradiation with ultraviolet light to obtain a retardation layer laminate in which the 1 st retardation layer and the 2 nd retardation layer were laminated with an adhesive layer therebetween. The obtained retardation layer laminate was cut into a rectangular shape so that the slow axis of the 1 st retardation layer (1/4 wavelength plate) was parallel to the longitudinal direction.
[ measurement of distance L1 of missing rubber portion ]
An acrylic pressure-sensitive adhesive layer having a thickness of 20 μm provided on a release film was laminated on the 2 nd retardation layer side of the optical laminate obtained in each example and each comparative example to obtain an optical laminate with a pressure-sensitive adhesive layer. The side on which the adhesive-lacking portion was formed was confirmed for the optical laminate with an adhesive layer, and the optical laminate with an adhesive layer was cut in a direction perpendicular to the side at the position where the adhesive-lacking portion was formed, and the profile of the cross section at that time was measured using a laser microscope. Based on the measured profile, a distance L1 between the position of the innermost end of the adhesive layer 61 and the position of the outermost end of the 1 st retardation layer was measured.
[ weather resistance test ]
An acrylic pressure-sensitive adhesive layer having a thickness of 20 μm was laminated on the 2 nd retardation layer side of the optical laminate obtained in each example and each comparative example, and the acrylic pressure-sensitive adhesive layer was bonded to a glass plate to prepare a sample for evaluation.
The obtained evaluation sample was left in a sunshine weather proof box (weather resistance tester) for 100 hours to carry out a weather resistance test. The evaluation sample after the weather resistance test was placed on a reflecting plate (milo 55011GP, manufactured by Alanod corporation) so that the glass plate was positioned on the lower side, and the color tone of the reflected light was measured using a spectrocolorimeter (CM2600d, Konica Minolta co. The color tone (a b) of the reflected light at the center of 4 edges of the sample for evaluation and the color tone (a b) of the reflected light at the center of the sample for evaluation (the intersection of the diagonal lines of the rectangle) were measured by mounting a mask having a diameter phi of 1.5mm at the time of light entering the integrating sphere from the sample for evaluation＊) The average value of the difference is calculated as Deltaa and Ab.
Δa＊b＊＝(Δa＊2+Δb＊2)1/2
Further, after the test sample for evaluation after the weather resistance test was placed on a reflecting plate (milo 55011GP manufactured by Alanod corporation), the reflected light was observed by visual observation from the optical laminate side, and the visibility for confirming the state of color unevenness of the optical laminate was evaluated. The case where color unevenness was weakly observed was evaluated as a, and the case where color unevenness was strongly observed was evaluated as B.
[ example 1]
Fig. 3(a) and (b) are schematic views for explaining a method of manufacturing an adhesive layer according to an embodiment. As shown in fig. 3(a), a release film-attached pressure-sensitive adhesive layer 60 having a pressure-sensitive adhesive layer 61 formed using an acrylic pressure-sensitive adhesive having a thickness of 20 μm on a release film 62 was prepared. The adhesive layer 61 contains an ultraviolet absorber. As shown in fig. 3 a, the pressure-sensitive adhesive layer 60 with a release film is cut into a rectangular shape by cutting a cutting blade 65 having an angle θ of a tip portion 65a from the pressure-sensitive adhesive layer 61 side in a direction parallel to the laminating direction of the pressure-sensitive adhesive layer 60 with a release film (arrow direction in the figure). A single-edged cutting blade is used as the cutting blade 65. The cut surface of the adhesive layer 60 with a release film in a rectangular shape after cutting is a surface on which a blade is formed, of both surfaces of the cutting blade 65 of a single blade is contacted.
The pressure-sensitive adhesive layer 61 of the pressure-sensitive adhesive layer 60 with the release film having the rectangular shape thus obtained was bonded to the 1 st protective layer side (triacetyl cellulose film side) of the polarizing plate produced in the above-described manner, and then the release film 62 was peeled off. After the surface of the retardation layer laminate produced in the above-described manner, from which the 1 st retardation layer COP film was peeled, was bonded to the surface of the pressure-sensitive adhesive layer 61 from which the release film 62 was peeled, the 2 nd retardation layer COP film was peeled, and an optical laminate (circularly polarizing plate) having a layer structure of 2 nd protective layer/polarizing layer/1 st protective layer/pressure-sensitive adhesive layer 61/1 st retardation layer/pressure-sensitive adhesive layer/2 nd retardation layer was obtained. In the production of the optical laminate, when the layers were bonded, the bonding surfaces were subjected to corona treatment, and when the layers were bonded, the long and short sides of each layer were aligned so that the absorption axis direction of the polarizing layer was 45 ° to the slow axis direction of the 1 st retardation layer.
The optical laminate thus obtained had a defective portion formed over the entire periphery thereof. The distance L1 was measured for the glue-lacking portions at arbitrary positions on each side of the optical laminate according to the procedure described above, and the average value thereof was calculated. Further, the weather resistance test of the obtained optical laminate was performed, and the change in color tone of the reflected light was measured to evaluate the visibility for confirming the state of color unevenness. These results are shown in table 1. From the measurement results of the distance L1 between the respective sides, it was confirmed that the distance L1 of the missing portion was about the same as the value shown in table 1 over the entire circumference of the optical laminate of this example.
[ example 2 and comparative example 1]
An optical laminate was obtained in the same manner as in example 1, except that as a dicing blade for cutting the release film-attached pressure-sensitive adhesive layer 60 (fig. 3(a)), a rectangular release film-attached pressure-sensitive adhesive layer 60 was obtained using a dicing blade (single blade) having a tip portion 65a with an angle θ larger than that used in example 1. The optical laminate thus obtained had a defective portion formed over the entire periphery thereof. The distance L1 was measured in accordance with the procedure described above for the glue-lacking portions at arbitrary positions on each side of the optical laminate, and the average value thereof was calculated. Further, the weather resistance test of the obtained optical laminate was performed, and the change in color tone of the reflected light was measured to evaluate the visibility for confirming the state of color unevenness. These results are shown in table 1. From the measurement results of the distance L1 between the respective sides, it was confirmed that the distance L1 of the missing portion was about the same as the value shown in table 1 over the entire circumference of the optical laminate of this example.
[ Table 1]
Claims (11)
1. An optical laminate comprising a polarizing layer, a pressure-sensitive adhesive layer and a 1 st retardation layer in this order,
the 1 st phase difference layer is a liquid crystal layer,
the optical laminate has a glue-lacking portion at an end portion in a plane direction thereof,
the adhesive-missing part is formed such that, in a cross section passing through a portion where the 1 st retardation layer and the adhesive layer overlap in the lamination direction, a position of an innermost end of an end portion of the adhesive layer is located inward in a range of more than 0 μm and 10 μm or less with respect to a position of an outermost end of the end portion of the 1 st retardation layer.
2. The optical stack of claim 1,
the optical laminate has a square shape or a square shape having a notch portion on at least one side, and the adhesive-lacking portion is formed on at least one side of the square shape.
3. The optical stack of claim 2,
the square has a pair of long sides and a pair of short sides,
the absorption axis direction of the polarizing layer forms an angle of 45 ° ± 10 ° with respect to the long side,
the adhesive-lacking portion is formed on at least one of the pair of long sides and at least one of the pair of short sides.
4. The optical stack of claim 2,
the square has a pair of long sides and a pair of short sides,
the absorption axis direction of the polarizing layer forms an angle of 0 ° ± 10 ° with respect to the long side,
the adhesive-lacking portion is formed on at least one of the pair of short sides.
5. The optical stack of claim 2,
the square has a pair of long sides and a pair of short sides,
the absorption axis direction of the polarizing layer forms an angle of 0 ° ± 10 ° with respect to the short side,
the adhesive-lacking portion is formed on at least one of the pair of long sides.
6. The optical stack according to any one of claims 1 to 5,
the adhesive layer of the adhesive-lacking portion has a position on the 1 st retardation layer side end portion located outside the surface direction with respect to the position of the end portion on the surface of the polarizing layer.
7. The optical stack according to any one of claims 1 to 6,
and one or two surfaces of the polarization layer are provided with protective layers.
8. The optical stack according to any one of claims 1 to 7,
and a 2 nd phase difference layer on the opposite side of the 1 st phase difference layer from the adhesive layer.
9. The optical stack of claim 8,
the 2 nd retardation layer is provided on the 1 st retardation layer via an adhesive layer.
10. The optical stack according to any one of claims 1 to 9,
the adhesive layer includes an ultraviolet absorber.
11. The optical laminate of any one of claims 1-10, which is a circularly polarizing plate.
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| JP2019-070461 | 2019-04-02 | ||
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| KR (1) | KR20200116861A (en) |
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| CN115246254A (en) * | 2021-04-26 | 2022-10-28 | 住友化学株式会社 | Optical laminate and wound body thereof |
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- 2020-03-11 JP JP2020042074A patent/JP7412231B2/en active Active
- 2020-03-16 TW TW109108601A patent/TW202043877A/en unknown
- 2020-03-30 KR KR1020200038305A patent/KR20200116861A/en active Search and Examination
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| JP2020170152A (en) | 2020-10-15 |
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| TW202043877A (en) | 2020-12-01 |
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