TW202043877A - Optical laminate - Google Patents

Abstract

An objective of this invention is providing an optical laminate capable of suppressing deterioration of in-plane hue uniformity of reflected light even exposed to external light including ultraviolet light.

Provided is an optical laminate having a polarizing layer, a pressure-sensitive adhesive layer, and a first retardation layer in this order. The first retardation layer is a liquid crystal layer. The optical laminate has a glue-lacking portion at an end portion in the plane direction, and the glue- lacking portion of the adhesive layer is formed such that the position of the innermost end of the end portion is located at an inner side of the position of the outermost end of the end portion of the first retardation layer by a distance of more than 0 μm and 10 μm or less in a cross section passing through a portion where the first retardation layer and the adhesive layer overlap in the laminating direction.

Description

Optical laminate

The present invention relates to an optical laminate.

Polarizing layers, retardation layers, etc. are widely used as optical members constituting organic EL display devices or liquid crystal display devices using organic light-emitting diodes (OLED). For example, Patent Document 1 describes the use of a composite polarizing plate in which a polarizer and a phase difference film coated with a liquid crystal compound are laminated in a liquid crystal display device.

Patent Document 1 describes that by cutting the composite polarizing plate with a tip cut or the like, the unevenness that exists on the outer peripheral end surface (cut section) is eliminated, and the peeling or floating of the retardation film can be suppressed even under humid and hot conditions. Bad situation.

[Prior Technical Literature]

[Patent Literature]

[Patent Document 1] JP 2008-9237 A

When the composite polarizing plate laminated with the polarizing layer and the retardation film was exposed to external light including ultraviolet rays, it was found that the hue of the reflected light at the end of the composite polarizing plate changed, which deteriorated the uniformity of the reflected light in the plane. .

The object of the present invention is to provide an optical laminate that can suppress the deterioration of the uniformity of the hue of reflected light in the plane even when exposed to external light including ultraviolet rays.

The present invention provides the following optical laminate.

[1] An optical laminate having a polarizing layer, an adhesive layer, and a first retardation layer in this order, wherein:

The aforementioned first retardation layer is a liquid crystal layer,

The aforementioned optical laminate has a glue-deficient part at its end in the surface direction,

The glue-deficient part is made so that the innermost position of the end of the adhesive layer is located from the first retardation layer in the cross section of the part where the first retardation layer and the adhesive layer overlap in the lamination direction. The position of the outermost end of the end portion of, is formed to exceed the range of 0 μ and 10 μm or less from the inside.

[2] The optical layered body according to [1], wherein the optical layered body has a square shape or a square shape with a notch on at least one side,

The aforementioned glue-deficient part is formed on at least one side of the square shape.

[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 the long side,

The glue-deficient part is formed on at least one side of the pair of long sides and at least one side 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 direction of the absorption axis of the polarizing layer forms an angle of 0°±10° with the long side,

The lack of glue is formed on at least one side 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 is at an angle of 0°±10° with the short side,

The glue-deficient part is formed on at least one side of the pair of long sides.

[6] The optical laminate according to any one of [1] to [5], wherein in the adhesive layer in the glue-deficient portion, the position of the end on the side of the first retardation layer is higher than that of the polarizing layer The position of the end of the surface is more outward in the surface direction.

[7] The optical laminate according to any one of [1] to [6], which has a protective layer on one or both sides of the polarizing layer.

[8] The optical layered body according to any one of [1] to [7], further including a second retardation layer on the opposite side of the first retardation layer from the adhesive layer.

[9] The optical layered body according to [8], wherein the second retardation layer is provided on the first retardation layer via an adhesive layer.

[10] The optical laminate according to any one of [1] to [9], wherein the adhesive layer contains an ultraviolet absorber.

[11] The optical laminate according to any one of [1] to [10] is a circularly polarizing plate.

According to the present invention, it is possible to provide an optical layered body that can suppress the deterioration of the uniformity of the hue of reflected light in the plane even when exposed to external light including ultraviolet rays.

5: Lack of glue

11: Optical laminate

12: Optical laminate

21: The first retardation layer

22: The second retardation layer

31: Adhesive layer

35: Next layer

40: Polarizing plate

41: Polarizing layer

42: The first protective layer

43: 2nd protective layer

60: Adhesive layer with peeling film

61: Adhesive layer

62: peeling film

65: Cutting Knife

65a: Front end part (tip part)

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 diagrams for explaining the method of manufacturing the adhesive layer in the embodiment.

Hereinafter, preferred embodiments of the optical laminate of the present invention will be described with reference to the drawings. In addition, the scope of the present invention is not limited by the embodiments described here, and various changes can be made within a range that does not impair the gist of the present invention.

Fig. 1 is a cross-sectional view schematically showing an example of the optical laminate of the present embodiment. In the figure, W represents the surface direction. As shown in FIG. 1, the optical layered body 11 of this embodiment has a polarizing plate 40, an adhesive layer 31, and a first retardation layer 21 in this order. The polarizing plate 40 of the optical laminate 11 shown in FIG. 1 has a first protective layer 42 (protective layer), a polarizing layer 41, and a second protective layer 43 (protective layer) in this order. In the optical laminate 11, An adhesive layer 31 is provided on the side of the first protective layer 42.

The polarizing layer 41 may be a polyvinyl alcohol-based resin film with a dichroic dye such as iodine adsorbed and aligned, and the PVA-based resin film is usually a stretched stretched polyvinyl alcohol-based resin film. The polarizing layer 41 may be one having a dichroic dye aligned in a layer hardened by a liquid crystal compound. The first protective layer 42 and the second protective layer 43 are layers for protecting the polarizing layer 41. The first retardation layer 21 is a liquid crystal layer containing a liquid crystal compound. For the liquid crystal layer, for example, a hard polymer formed by polymerizing a polymerizable liquid crystal compound 化层。 The layer. The optical layered body 11 may have an alignment layer for aligning the liquid crystal compound constituting the first retardation layer 21 on the side opposite to the adhesive layer 31 of the first retardation layer 21.

The optical layered body 11 has a glue-deficient part 5 at the end in the surface direction W thereof. As shown in FIG. 1, the glue-deficient portion 5 is in the cross section of the portion overlapping the lamination direction orthogonal to the surface direction W through the first retardation layer 21 and the adhesive layer 31, so that the end of the adhesive layer 31 The position of the innermost end in the end portion of the first retardation layer 21 is formed so as to be within a length range of the distance L1 from the position of the outermost end in the end portion of the first retardation layer 21. In this specification, the position of the innermost end among the ends of the adhesive layer 31 refers to the position that is the innermost in the surface direction W among the ends of the adhesive layer 31, and the position of the innermost end among the ends of the first retardation layer 21 The position of the outer end refers to the outermost position in the surface direction W among the ends of the first retardation layer 21.

The distance L1 of the glue-deficient part 5 is more than 0 μm, can be 0.2 μm or more, 0.5 μm or more, 2 μm or more, and is 10 μm or less, preferably 8 μm or less, can be 5 μm or less, or less than 5 μm.

The first retardation layer 21 contained in the optical layered body 11 is a liquid crystal layer containing a liquid crystal compound. The first retardation layer 21 of such a liquid crystal layer is estimated to be exposed to external light including ultraviolet rays during use of the optical layered body 11, and the liquid crystal compound is likely to be degraded due to the organic compound. When the first retardation layer 21 is degraded, it is considered that the first retardation layer 21 loses its original retardation characteristics and changes the hue of the reflected light of the optical laminate 11. When the optical laminate 11 is applied to a display device or the like, usually the first retardation layer 21 side is used as the display device side, and the polarizing plate 40 side is exposed to the outside. Therefore, the polarizing plate 40 side of the first retardation layer 21 is easily exposed to the In the external light of ultraviolet rays. In the present embodiment, by setting the distance L1 in the glue-deficient portion 5 of the optical laminate 11 to 10 μm or less, the area not covered by the adhesive layer 31 is reduced as much as possible. Thereby, deterioration of the first retardation layer 21 due to external light is suppressed, and even if the optical layered body 11 is exposed to external light, it is estimated that the uniformity of the hue of reflected light in the plane can be suppressed from deteriorating.

The distance L1 of the glue-deficient part 5 can be used to measure the profile of the cross section of the optical laminate 11 using a laser microscope, and based on the position of the innermost end among the ends of the adhesive layer 31 determined based on the profile, and the first phase The position of the outermost end among the ends of the differential layer 21 is calculated. When the outer shape of the optical layered body 11 has a linear side, and the glue-deficient portion 5 is formed on the side, the cross-section of the optical layered body 11 is adopted: in the position where the glue-deficient portion 5 is formed on the side, along The cross section when cut in the direction perpendicular to the side. In addition, when the outer shape of the optical laminate 11 has a curved portion and the glue-deficient portion 5 is formed in the curved portion, the cross-section of the optical laminate 11 is adopted: the optical laminate 11 passes through the position P where the glue-deficient portion 5 is formed The position P of the tangent line in the surface direction is the cross section when cut along the direction perpendicular to the connection line.

The shape of the glue-deficient portion 5 in the optical laminate 11 is not particularly limited. The end portion of the adhesive layer 31 may have a sloped shape as shown in FIG. 1, or may be parallel to the laminate direction orthogonal to the surface direction W, or It is formed in a zigzag, uneven, curved, etc. As shown in FIG. 1, the adhesive layer 31 in the glue-deficient portion 5 is such that the end of the adhesive layer 31 on the side of the first retardation layer 21 is positioned higher than the end of the surface on the polarizing plate 40 side. It is better that the position is more to the outside in the surface direction, and its shape is more preferably an inclined surface shape. Thereby, in the end portion of the first retardation layer 21, the range of the surface of the first retardation layer 21 exposed without the adhesive layer 31 can be reduced. Therefore, it is considered that even if the optical layered body 11 is exposed to external light, It is also easy to suppress the deterioration of the uniformity of the hue of reflected light in the plane.

The outer shape of the optical layered body 11 may be a square shape in the surface direction (plan view), or a square shape having a notch on at least one side. In this specification, the square shape refers to a rectangular shape or a square shape, and at least one of the four corners of the square shape is rounded.

In addition, the boundary of the two sides connected by the rounded portion is a position where the contour length of the rounded portion is halved. The contour length of the rounded part is the two sides connected by the rounded part. The length of the straight portion between the ends on the side of the rounded portion. Examples of the notch portion include a concave shape recessed toward the opposite side, and the concave shape may be U-shaped or V-shaped.

The notch may be formed on one side of the square shape, or may be formed on two or more sides. For example, when the notch is a smart phone, etc., it can be installed in the receiver, speaker, camera lens, LED light, proximity sensor, brightness sensor, fingerprint recognition sensor, operation button, etc. At least one area.

When the optical laminate 11 has a square shape, the glue-deficient portion 5 is preferably formed on at least one side of the square shape, and may be formed on two or more sides, or may be formed on all four sides. In addition, the glue-deficient part 5 may be formed continuously or discontinuously over the entire length of the side, or may be formed on a part of the side. When the glue-deficient portion 5 is continuously formed on the side, it is preferably included in the area where the glue-deficient portion 5 is continuously formed at more than 50% of the full length of the side, and more preferably the area occupies more than 70% of the full length of the side. Preferably, it is more than 90%. When the glue-deficient portion 5 is continuously formed to cover the above range, the change in the hue of reflected light tends to become obvious. However, in the optical laminate 11, as described above, the distance L1 of the glue-deficient portion 5 is set to 10 μm or less. Therefore, the change in the hue of the reflected light at the end can be suppressed. Thereby, even if the optical layered body 11 is exposed to external light, it is easy to suppress the deterioration of the uniformity of the hue of the reflected light in the plane.

The optical layered body 11 may have a hole penetrating the entire optical layered body 11 in the layering direction. The hole may have a round shape, or a polygonal shape such as a circular shape, a quadrangular shape, or a hexagonal shape, and at least one of the corners of the polygonal shape may be rounded. A glue-deficient part 5 may be formed around the hole part. The lack of glue formed in the hole may be formed in at least a part of the surrounding part of the hole, or may be formed in the entire surrounding part of the hole. When the hole is, for example, a smartphone, it can be provided in an area where a camera lens or the like is to be installed.

When the optical layered body 11 has a square shape, and the square shape is 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 and the long sides are at an angle of 45°±10°, The lack of glue part 5 is preferably formed on at least one of a pair of long sides and at least one of a pair of short sides side. In this specification, the above-mentioned angle refers to an acute angle among the angles between the direction of the absorption axis and the long side. The glue-deficient part 5 may be formed on both sides of a pair of long sides, or may be formed on both sides of a pair of short sides. The polarizing layer 41 of the optical layered body 11 may expand and contract in the direction of its absorption axis in response to environmental changes such as changes in humidity. In this case, the elastic stress of the polarizing layer 41 tends to be concentrated in the sides at both ends of the absorption axis. 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 is concentrated on both the long side and the short side, and the first retardation layer 21 The hue of the reflected light is easy to change. As described above, by providing the glue-deficient portion 5 on at least one side of the pair of long sides and at least one side of the pair of short sides, even if the polarizing layer 41 of the optical laminate 11 expands and contracts, the stretching stress in the polarizing layer 41 tends to concentrate. In part, the stretching stress can also be dispersed. Thereby, it is considered that even if the polarizing layer 41 is stretched, it is possible to effectively suppress the deterioration of the uniformity of the hue of the reflected light in the plane. The angle between the absorption axis direction of the polarizing layer 41 and the long side may be 45°±5°, 45°±2°, or 45°.

When the optical layered body 11 has a square shape, and the square shape is 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 and the long sides have an angle of 0°±10°, The glue-deficient part 5 is preferably formed on at least one side of a pair of short sides. In this specification, the above-mentioned angle refers to an acute angle among the angles between the direction of the absorption axis and the long side. The lack of glue 5 can be formed on both sides of a pair of short sides. In the optical laminate 11 in which the absorption axis direction and the long side are in a relationship of 0°±10°, it is considered that the stretching stress of the polarizing layer 41 tends to be concentrated on the short side, and the light reflected by the first retardation layer 21 The hue is easy to change. Therefore, it is considered that by providing the glue-deficient portion 5 on at least one side of a pair of short sides, even if the polarizing layer 41 expands and contracts, the deterioration of the uniformity of the reflected light in the plane can be effectively suppressed. The angle between the absorption axis direction of the polarizing layer 41 and the long side may be 0°±5°, may also be 0°±2°, or may be 0°.

The optical laminate 11 has a square shape, and the square shape is 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 is sandwiched by 0°±10° with the short sides. When angled, the glue-deficient part 5 is preferably formed on at least one side of a pair of long sides. In this specification, the above-mentioned angle refers to an acute angle among the angles between the direction of the absorption axis and the long side. The lack of glue part 5 may be formed on both sides of a pair of long sides. For the above reasons, it is considered that in the optical laminate 11 in which the absorption axis direction and the long side are in a relationship of 0°±10°, the stretching stress of the polarizing layer 41 tends to concentrate on the long side, and the reflected light of the first retardation layer 21 Hue is easy to change. Therefore, it is considered that by providing the glue-deficient portion 5 on at least one side of a pair of long sides, even if the polarizing layer 41 expands and contracts, it is possible to effectively suppress the deterioration of the uniformity of the reflected light in the plane. The angle between the absorption axis direction of the polarizing layer 41 and the short side may be 0°±5°, may also be 0°±2°, or may be 0°.

The adhesive layer 31 preferably contains an ultraviolet absorber. By making the region covered by the adhesive layer 31 in the first retardation layer 21 contain an ultraviolet absorber, it is possible to further suppress the deterioration of the first retardation layer 21 due to external light. Therefore, even if the optical layered body 11 is exposed to external light, the uniformity of the hue of the reflected light in the plane can hardly be further deteriorated.

In the optical laminate 11 shown in FIG. 1, the first retardation layer 21 may be an A plate or a C plate. In addition, in the optical layered body 11 shown in FIG. 1, the first retardation layer 21 can be used as a circular polarizing plate by using a quarter-wavelength plate.

The optical laminate 11 shown in FIG. 1 can be manufactured, for example, by preparing the polarizing plate 40 and the first retardation layer 21 on the first protective layer 42 side of the polarizing plate 40 and the first retardation layer 21 At least one of the above is coated or transferred with an adhesive, and the polarizing plate 40 and the first retardation layer 21 are bonded via a layer of the adhesive. When the first retardation layer 21 is a liquid crystal layer, the first retardation layer 21 of the first retardation layer with a substrate layer and the first retardation layer 21 can be releasably formed on the first substrate layer. After the polarizer 40 is laminated with the adhesive interposed, the first base material layer is peeled off.

The method of forming the glue-deficient portion 5 in the optical layered body 11 is not particularly limited, but for example, the coating range or transfer position of the adhesive layer used to form the adhesive layer 31 can be adjusted. And formed. When the adhesive layer 31 is formed by transfer, the adhesive layer formed on the release film or the like prepared for the transfer can be formed in advance to become the part of the glue shortage 5, and then the formed part will become the defect. The adhesive layer of the glue part 5 is transferred to the polarizing plate 40 or the first retardation layer 21.

When the adhesive layer formed on the release film or the like is formed to become the part of the glue-deficient part 5, for example, as shown in Figs. 3(a) to (b), it is possible to prepare an adhesive layer formed on the release film 62 The adhesive layer 60 with the release film of the agent layer 61 is formed by cutting the adhesive layer 60 with the release film from the side of the adhesive layer 61 with a single-edge cutter 65. In the process of cutting the adhesive layer 60 with the release film in this way, the blade side surface is formed on both sides of the single-blade cutting blade 65, so that the adhesive layer 61 is squeezed into a bevel shape. , And can form an adhesive layer with a beveled end.

(Modification)

The optical film of this embodiment can be modified as the modification shown below, and each structure and each step of the embodiment and its modification can be combined and implemented.

(Modification 1)

In the above-mentioned embodiment, the optical laminate 11 provided with the polarizing plate 40 having the first protective layer 42 and the second protective layer 43 on both sides of the polarizing layer 41 has been described, but it is not limited to this. The polarizing plate may include the polarizing layer 41 and any one of the first protective layer 42 and the second protective layer 43. In addition, the optical layered body 11 may not include the first protective layer 42 and the second 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 example, for antireflection of an organic electroluminescence (organic EL) display device. At this time, the optical layered body 11 is used by bonding the viewing side of the optical display element of the organic EL display device. Therefore, the optical layered body 11 may have an adhesive layer for an optical display element for bonding to an optical display element on the side opposite to the adhesive layer 31 of the first retardation layer 21.

(Modification 3)

In the above-mentioned embodiment, the optical laminate 11 including the first retardation layer 21 has been described, but it is not limited to this, and may be, for example, an optical laminate as shown in FIG. 2. Fig. 2 is a cross-sectional view schematically showing another example of the optical laminate of this embodiment. In the following, the same reference numerals are given to the same members as those described above, and the description thereof is omitted. The optical layered body 12 shown in FIG. 2 has a polarizing plate 40, an adhesive layer 31, a first retardation layer 21, an adhesive layer 35, and a second retardation layer 22 in this order. The adhesive layer 35 may be an adhesive layer formed using an adhesive, or may be an adhesive layer formed using an adhesive. The second 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. When the second retardation layer 22 is a liquid crystal layer, the optical laminate 12 may have an alignment for aligning the liquid crystal compound constituting the second retardation layer 22 on the side opposite to the adhesive layer 35 of the second retardation layer 22 Floor.

In the optical layered body 12, the first retardation layer 21 is a 1/2-wavelength plate, the second retardation layer 22 is a quarter-wavelength plate, and the first retardation layer 21 is a reverse wavelength dispersion. The 1/4 wavelength plate and the second retardation layer 22 are set to a positive C plate; the first retardation layer 21 is set to a positive C plate, and the second retardation layer 22 is set to 1/4 of the reverse wavelength dispersion. Wavelength plates, etc., can be used as circular polarizers. When the combination of the first retardation layer 21 and the second retardation layer 22 is a half-wave plate and a quarter-wave plate, the slow axis direction of the half-wave plate can be adjusted relative to the absorption axis direction of the polarizing layer 41 Set to 70° to 80°, and set the slow axis direction of the quarter-wavelength plate to 10° to 20°. In addition, when the combination of the first retardation layer 21 and the second retardation layer 22 is a reverse wavelength dispersive quarter-wave plate and a positive C plate, the absorption axis direction of the polarizing layer 41 can be 1/4 The slow axis direction of the wave plate is set to 40° to 50°. When the circularly polarizing plate optical laminate 12 is used for anti-reflection of an organic EL display device, the optical laminate 12 shown in FIG. 2 can have an optical display on the opposite side of the second retardation layer 22 from the adhesive layer 35 Adhesive layer for components.

The optical laminate 12 shown in FIG. 2 can be formed, for example, by preparing a phase in which the first retardation layer 21 and the second retardation layer 22 are laminated with the adhesive layer 35 interposed therebetween. The differential layer laminate and the polarizing plate 40 are coated or transferred with an adhesive on at least one of the first protective layer 42 side of the polarizing plate 40 and the first retardation layer 21 side of the retardation layered body to polarize The plate 40 and the retardation layered body are bonded together via an adhesive. When the first retardation layer 21 and the second retardation layer 22 are both liquid crystal layers, the optical layered body 12 can be obtained, for example, as follows. First of all, the first retardation layer 21 of the first retardation layer with the substrate layer of the first retardation layer 21 is releasably formed on the first substrate layer, and the first retardation layer 21 is peelable on the second substrate layer. The second retardation layer 22 in which the second retardation layer with the base material layer of the second retardation layer 22 is formed is laminated via the adhesive layer to obtain a retardation laminate. Next, the first base layer is peeled from the retardation layered body, and the first retardation layer 21 side and the first protective layer 42 side of the polarizing plate 40 are laminated with an adhesive interposed therebetween, and then the second base layer By peeling, the optical layered body 12 shown in FIG. 2 can be obtained.

The following describes in detail the common items in the above-mentioned embodiment and its modification.

(Polarizing layer)

The polarizing layer may be a polyvinyl alcohol-based resin film (hereinafter sometimes referred to as "PVA-based resin film") that has dichroic pigments such as iodine adsorbed and aligned, or it may be aligned in a layer hardened by a liquid crystal compound. Sexual pigments.

The PVA-based resin film is a film formed using polyvinyl alcohol-based resin. The polyvinyl alcohol-based resin refers to a resin containing 50% by mass or more of structural units derived from vinyl alcohol. The polyvinyl alcohol-based resin may be saponified by polyvinyl acetate-based resin. The degree of saponification of the polyvinyl acetate-based resin can be determined in accordance with JIS K 6727 (1994), and for example, it can be in the range of 80.0 to 100.0 mol%.

Examples of the polyvinyl acetate resin include polyvinyl acetate which is a homopolymer of vinyl acetate, copolymers of vinyl acetate, and other monomers copolymerizable with the vinyl acetate. Examples of other monomers that can be copolymerized with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth)acrylamides having an ammonium group. in In this specification, the term "(meth)acrylic acid" means at least one selected from the group consisting of acrylic acid and methacrylic acid. The same applies to other terms marked with "(methyl)".

An example of the PVA-based resin film may be an unstretched film obtained by forming a polyvinyl alcohol-based resin into a film, or a stretched film obtained by stretching the unstretched film. When the PVA-based resin film is a stretched film, it is preferably a stretched film uniaxially stretched in the longitudinal direction, and preferably a stretched film stretched in a dry manner. The stretching ratio when the PVA-based resin film is a stretched film is usually 1.1 to 8 times.

Examples of dichroic dyes adsorbed and aligned on the PVA-based resin film include iodine or organic dyes. Examples of organic dyes include Red BR, Red LR, Red R, Pink LB, Rubin BL, Bordeaux-GS, Sky Blue LG, Lemon Yellow, Blue BR, Blue 2R, Navy RY, Green LG, Violet LB, Violet B, Black H, Black B, Black GSP, Yellow 3G, Yellow R, Orange LR, Orange 3R, Scarlet GL, Scarlet KGL, Congo Red, Brilliant Violet BK, Supra Blue G, Supra Blue GL, Supra Orange GL, Direct Sky Blue, Direct Fast Orange S, Fast Black, etc. The dichroic dye may be used alone or in combination of two or more.

Examples of the polarizing layer in which the dichroic dye is aligned in the layer hardened by the liquid crystal compound can be exemplified by aligning the dichroic dye in a polymerizable liquid crystal compound and polymerizing the polymerizable liquid crystal compound to form a hardened layer. Such a polarizing layer can be formed by coating a composition for forming a polarizing layer containing a liquid crystal compound and a dichroic dye on a base film, and polymerizing and curing the liquid crystal compound while maintaining a liquid crystal state. The polarizing layer obtained in this way is in the state of being laminated on the base film, and the base film can be directly used as a protective layer of the polarizing layer. Alternatively, with respect to the polarizing layer, the polarizing layer with the base film of the peelable base film may be laminated on the first retardation layer via the adhesive layer 31, and then the base film may be peeled off.

The liquid crystal compound only needs to have the property of showing a liquid crystal state, and especially those with a high-order alignment state equivalent to the smectic type can exhibit higher polarization performance and are therefore preferred.

In addition, the liquid crystal compound is preferably one having a polymerizable functional group. The dichroic dye is a dye that is aligned with the liquid crystal compound to show dichroism. The dichroic dye itself may have liquid crystallinity or may have a polymerizable functional group. Any compound of 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 the polarizing layer using a liquid crystal compound include acridine dyes, oxazine dyes, cyanine dyes, naphthalene dyes, azo dyes, and onion dyes. Among them, azo dyes are preferred. Examples of azo dyes include monoazo dyes, bisazo dyes, ginsenochromes, tetrazo dyes, and stilbene azo dyes, and more preferably bisazo dyes and ginsenochromes. The dichroic dye can be used alone or in combination of two or more.

The composition for forming a polarizing layer may contain a polymerization initiator such as a solvent, a photopolymerization initiator, a photosensitizer, a polymerization inhibitor, a dispersant, a leveling agent, a stabilizer, a surfactant, a crosslinking agent, and a silane coupling剂 etc. Known ones can be used for the polymerizable liquid crystal compound, dichroic dye, solvent, polymerization initiator, photosensitizer, polymerization inhibitor, etc. contained in the composition for forming a polarizing layer. In addition, the polymerizable liquid crystal compound may be the same as the compounds listed as the polymerizable liquid crystal compound used to obtain the first retardation layer and the second retardation layer.

The thickness of the polarizing layer 41 is usually 2 to 40 μm, and from the viewpoint of thinning the polarizing layer, it is preferably 30 μm or less, and more preferably 20 μm or less. In the liquid crystal compound, the layer with dichroic dyes aligned, that is, the polarizing layer, can be formed to be smaller in thickness than the polarizing layer with dichroic dyes such as iodine adsorbed and aligned with the PVA-based resin film. The thickness of the polarizing layer using the liquid crystal compound is, for example, 0.5 to 5 μm, preferably 1 to 4 μm.

In addition, the visual sensitivity correction monomer transmittance Ty of the polarizing layer 41 is preferably 40 to 47%, and more preferably 41 to 45% in consideration of the balance of the visual sensitivity correction polarization Py. The visual sensitivity correction polarization degree Py is preferably 99.9% or more, more preferably 99.95% or more. Ty and Py series You can use an absorbance photometer with an integrating sphere to calibrate the obtained transmittance and polarization using the 2 degree viewing angle of JIS Z 8701 (light source C).

(Polarizer)

The polarizing plate is one in which protective layers (first protective layer, second protective layer) are laminated on one side or both sides of the polarizing layer via a known adhesive layer or adhesive layer. The thickness of the polarizing plate may be 2 μm or more and 300 μm or less, 10 μm or more, 150 μm or less, 120 μm or less, or 80 μm or less, for example.

The protective layer uses, for example, a film formed of a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier properties, isotropy, and extensibility. Specific examples of such thermoplastic resins include: cellulose resins such as cellulose triacetate; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; polyether sulfite resins; polysulfite resins; Polycarbonate resins; polyamide resins such as nylon or aromatic polyamides; polyimide resins; polyolefin resins such as polyethylene, polypropylene, and ethylene/propylene copolymers; those with a ring system and norbornene structure Cyclic polyolefin resin (also referred to as norbornene resin); (meth)acrylic resin; polyarylate resin; polystyrene resin; polyvinyl alcohol resin, and mixtures thereof. In the case of the two-area protective layer of the polarizing layer, the resin composition of the two protective layers may be the same or different. The film formed of a thermoplastic resin may be subjected to surface treatment (for example, corona treatment, etc.) in order to improve the adhesion to the polarizing layer, or may be formed with a thin layer such as a primer layer (also called a primer layer).

The protective layer may be, for example, the above-mentioned thermoplastic resin stretched or unstretched (hereinafter sometimes referred to as "unstretched resin"). Examples of the stretching treatment include uniaxial stretching or biaxial stretching.

The thickness of the protective layer is preferably 3 μm or more, more preferably 5 μm or more. In addition, the thickness of the protective layer is preferably 50 μm or less, more preferably 30 μm or less. In addition, the above upper limit and lower limit can be combined arbitrarily. The thinner the thickness of the polarizing plate, the smaller the rigidity becomes, and the more easily it is affected by the stretching stress of the polarizing layer. Therefore, the thickness of the polarizer is small and the optical In the layered body, the ends thereof are easily affected by the stretching stress of the polarizing layer, and there is a tendency that the uniformity of the hue of the reflected light in the surface is easily deteriorated due to environmental changes such as humidity changes. Therefore, in such an optical laminate, as described above, by setting the distance L1 of the lack of glue to 3 μm or more, even if the environment changes, the deterioration of the uniformity of the reflected light in the plane can be effectively suppressed. .

The surface of the protective layer opposite to the polarizing layer may have a surface treatment layer, such as a hard coat layer, an anti-reflection layer, an anti-adhesion layer, an anti-glare layer, a diffusion layer, and the like. The surface treatment layer may be another layer laminated on the protective layer, or may be formed by applying surface treatment to the surface of the protective layer.

(First retardation layer)

The first retardation layer is a liquid crystal layer containing a liquid crystal compound. The kind of liquid crystal compound constituting the liquid crystal layer is not particularly limited, and rod-shaped liquid crystal compounds, disc-shaped liquid crystal compounds, and mixtures thereof can be used. The liquid crystal layer can be formed by coating a liquid crystal layer forming composition of a liquid crystal compound, a solvent and various additives as necessary on the alignment layer to form a coating film, and curing (hardening) the coating film to form a hardening of the liquid crystal compound The layer is the liquid crystal layer. Alternatively, the composition for forming a liquid crystal layer may be applied on the first base material layer to form a coating film, and the coating film may be stretched together with the first base material layer to form a liquid crystal layer. The composition for forming a liquid crystal layer may contain a polymerization initiator, a reactive additive, a leveling agent, a polymerization inhibitor, etc. in addition to the above-mentioned liquid crystal compound and solvent.

As the liquid crystal compound, solvent, polymerization initiator, reactive additive, leveling agent, polymerization inhibitor, etc., known ones can be suitably used.

The first base material layer on which the liquid crystal layer is formed is preferably a film formed of a resin material. As the resin material, for example, a resin material excellent in transparency, mechanical strength, thermal stability, and extensibility is used. Specifically, examples include: polyolefin-based resins such as polyethylene and polypropylene; cyclic polyolefin-based resins such as norbornene-based polymers; poly(ethylene terephthalate) and polyethylene naphthalate; Ester resins; (meth)acrylic resins such as (meth)acrylic acid and polymethyl (meth)acrylate; cellulose esters such as cellulose triacetate, cellulose diacetate, and cellulose acetate propionate Series resins; Vinyl alcohol resins such as polyvinyl alcohol and polyvinyl acetate; Polycarbonate resins; Polystyrene resins; Polyarylate resins; Polyurethane resins; Polyether oxide resins; Polyamide resins Resins; Polyimide-based resins; Polyetherketone-based resins; Polyphenylene sulfide-based resins; Polyphenylene ether-based resins, and mixtures and copolymers thereof. Among these resins, it is preferable to use any one or a mixture of cyclic polyolefin resin, polyester resin, cellulose ester resin, and (meth)acrylic resin.

The first substrate layer may be a single layer, or may have a multilayer structure of two or more layers. In the case of a multilayer structure, the types of resins constituting each layer may be the same or different from each other. The thickness of the first substrate layer is not particularly limited, but generally, from the viewpoint of workability such as strength and handleability, it is preferably 1 to 300 μm, more preferably 10 to 200 μm, and still more preferably 30 to 120 μm.

The above-mentioned alignment layer has an alignment restricting force for aligning liquid crystal compounds such as a polymerizable liquid crystal compound contained in a liquid crystal layer formed above it in a desired direction. The alignment layer may include an alignment polymer layer formed of an alignment polymer, a photoalignment polymer layer formed of a photoalignment polymer, and grooves having uneven patterns or a plurality of grooves (grooves) on the surface of the layer. Alignment layer. The thickness of the alignment layer is usually 10 to 500 nm, preferably 10 to 200 nm.

(Second retardation layer)

The second retardation layer may be a retardation film or a liquid crystal layer. The retardation film may be one that exhibits optical anisotropy. For example, a stretched film may be used. The stretched film is made of polyvinyl alcohol, polycarbonate, polyester, polyarylate, polyimide, polyolefin, Film extension formed by polycyclic olefin, polystyrene, polytide, polyethertide, polyvinylidene fluoride/polymethyl methacrylate, cellulose acetate, saponified ethylene-vinyl acetate copolymer, polyvinyl chloride, etc. To about 1.01 to 6 times.

When the second retardation layer is a liquid crystal layer, the same liquid crystal compound used to obtain the first retardation layer can be used, and it can be formed by the same method as the method for forming the first retardation layer.

(Adhesive layer)

The adhesive layer is a layer formed using an adhesive. In this specification, the so-called adhesive refers to those that exhibit adhesiveness by attaching itself to an adherend such as an optical film or a liquid crystal layer, which is called a pressure-sensitive adhesive. The adhesive can use conventionally known adhesives with excellent optical transparency without special restrictions. For example, adhesives with matrix polymers such as acrylic, urethane, silicone, and polyvinyl ether can be used. Agent. The thickness of the adhesive layer may be 3 μm or more, 5 μm or more, and 35 μm or less, or 30 μm or less.

In addition to the aforementioned ultraviolet absorbers, the adhesive layer may also contain antistatic agents using ionic compounds, solvents, crosslinking catalysts, tackifiers (tackifiers), plasticizers, softeners, dyes, and pigments. , Inorganic fillers and other additives.

(Next layer)

The adhesive layer may be formed of an adhesive layer, an adhesive layer formed using an adhesive, and a combination of these, and it is usually one layer, or two or more layers. When the subsequent layer system is composed of two or more layers, each layer may be formed of the same material, or may be formed of different materials. The adhesive layer can be formed using the above-mentioned adhesive.

As the adhesive used in the adhesive layer, conventionally known adhesives such as water-based adhesives and active energy ray-curable adhesives can be used without particular limitations. Examples of the water-based adhesive include polyvinyl alcohol-based resin aqueous solutions and water-based two-component urethane-based emulsion adhesives. Active energy ray-curable adhesives are adhesives that are cured by irradiation with active energy rays such as ultraviolet rays. Examples include those containing polymerizable compounds and photopolymerizable initiators, those containing photoreactive resins, resins containing binders, and Photo-reactive crosslinking agent, etc. The above-mentioned polymerizable compound can be photocured Photopolymerizable monomers such as epoxy resin monomers, photocurable acrylic monomers, and photocurable urethane monomers, or oligomers derived from these monomers. Examples of the photopolymerization initiator include those containing active species that generate neutral radicals, anionic radicals, and cationic radicals by irradiating active energy rays such as ultraviolet rays.

(Example)

The following examples and comparative examples are used to illustrate the present invention more specifically, but the present invention is not limited to these examples. The "%" and "parts" in the examples and comparative examples indicate mass% and parts by mass unless otherwise noted.

[Production of Polarizing Plate]

A cellulose triacetate film with a thickness of 20 μm was prepared as the first protective layer. A norbornene-based resin film with a thickness of 29 μm with a hard coat layer formed on one surface was prepared as the second protective layer. As the polarizing layer, iodine, which is a dichroic dye, is adsorbed and aligned on the PVA-based resin film. The thickness of the polarizing layer is 8 μm.

In addition, 3 parts by weight of carboxyl modified polyvinyl alcohol [trade name "KL-318" obtained by Kuraray Co., Ltd.] are dissolved in 100 parts by weight of water, and polyamide which is a water-soluble epoxy resin is added to the aqueous solution. Epoxy-based additives [trade name "Sumirez Resin (registered trademark) 650(30)" obtained from Taoka Chemical Industry Co., Ltd., an aqueous solution with a solid content of 30% by weight] 1.5 parts by weight, were prepared into a water-based adhesive.

The first protective layer was subjected to saponification treatment, and the second protective layer was subjected to corona treatment to the surface on the norbornene-based resin film side and both sides of the polarizing layer. The first protective layer is attached to one side of the polarizing layer via the aqueous adhesive obtained above, and the second protective layer is opposite to the hard coat layer via the same aqueous adhesive as described above on the other side of the polarizing layer (Norbornene-based resin film side) bonded together, and dried to produce a polarizing plate. The obtained polarizing plate was cut into a rectangular shape so that the absorption axis and the longitudinal direction of the polarizing layer became 45°.

[Production of the first retardation layer]

(Preparation of composition for forming horizontal alignment layer)

The following components were mixed, and the resulting mixture was stirred at a temperature of 80°C for 1 hour, thereby obtaining a composition for forming a horizontal alignment layer.

‧Optical alignment material (5 parts) (weight average molecular weight: 30000):

‧Solvent (95 parts): Cyclopentanone

(Preparation of composition for forming horizontally aligned liquid crystal layer)

The following ingredients are mixed, N-methyl-2-pyrrolidone (NMP) is further added so that the solid content concentration becomes 13%, and the mixture is stirred at 80°C for 1 hour to obtain a horizontally aligned liquid crystal layer formation Composition. The following polymerizable liquid crystal compound A is synthesized according to the method described in JP 2010-31223 A, and the following polymerizable liquid crystal compound B is synthesized according to 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-morpholinylphenyl)butan-1-one (Irgacure 369, manufactured by BASF JAPAN Co., Ltd.)

(Production of the first retardation layer)

The cyclic olefin resin (COP) film (ZF-14-50, manufactured by Japan Zeon Co., Ltd.) was subjected to corona treatment. The above-obtained composition for forming a horizontal alignment layer was coated on the corona-treated surface of the COP film with a bar coater, and dried at 80°C for 1 minute. For this coating film, a polarized UV irradiation device ("SPOT CURE SP-9", manufactured by Ushio Electric Co., Ltd.) was used to expose the polarized UV at an axis angle of 45° so that the cumulative light quantity at a wavelength of 313nm became 100mJ/cm ² The horizontal alignment layer is obtained.

Subsequently, the horizontal alignment layer was coated with the above-obtained composition for forming a horizontal alignment liquid crystal layer using a bar coater, and dried at 120° C. for 1 minute. For the coating film, a high-pressure mercury lamp ("UNICUREVB-15201BY-A", manufactured by Ushio Electric Co., Ltd.) is used to irradiate ultraviolet light (accumulated light quantity at 365nm wavelength in a nitrogen environment: 500mJ/cm ² ) to form a horizontal alignment The first retardation layer of the liquid crystal layer. The first retardation layer is a quarter-wave plate exhibiting reverse wavelength dispersion.

[Production of the second retardation layer]

(Preparation of composition for forming vertical alignment layer)

Sunever SE610 (manufactured by Nissan Chemical Industry Co., Ltd.) was prepared as a composition for forming a vertical alignment layer.

(Preparation of composition for forming vertical alignment liquid crystal layer)

The following components are mixed, and cyclopentanone is further added so that the solid content concentration becomes 13%, to obtain a composition for forming a vertical alignment liquid crystal layer.

‧Polymerizable liquid crystal compound C (100 parts):

Paliocolor (registered trademark) LC242 (made by BASF)

‧Leveling agent (0.1 parts):

F-556 (manufactured by DIC)

‧Polymerization initiator (3 parts):

Irgacure369 (manufactured by Ciba Specialty Chemicals)

(Production of the second retardation layer)

The cyclic olefin resin (COP) film (ZF-14-50, manufactured by Japan Zeon Co., Ltd.) was subjected to corona treatment. The above-obtained composition for forming a vertical alignment layer was coated on the corona-treated surface of the COP film with a bar coater, and dried at 80° C. for 1 minute to obtain a vertical alignment layer. Next, the composition for forming a vertical alignment liquid crystal layer obtained above was coated on the vertical alignment layer using a bar coater, and dried at 90° C. for 120 seconds. For the coating film, a high-pressure mercury lamp ("UNICUREVB-15201BY-A", manufactured by Ushio Electric Co., Ltd.) was used to irradiate ultraviolet light (accumulated light quantity at 365nm wavelength in a nitrogen environment: 500mJ/cm ² ) to form a vertical alignment The second retardation layer of the liquid crystal layer. The second retardation layer is a positive C plate that satisfies the relationship of nx≒ny<nz.

[Production of retardation laminated body]

The surface on the opposite side of the COP film of the first retardation layer produced above and the surface on the opposite side of the COP film of the second retardation layer produced above were subjected to corona treatment. After the corona-treated surfaces (the surface of the first retardation layer and the surface of the second phase layer) are bonded to each other via an ultraviolet curable adhesive, the ultraviolet curable adhesive is irradiated to obtain the first retardation layer and The second retardation layer is a retardation layered body formed by laminating the adhesive agent. The obtained retardation layered body was cut into a rectangular shape so that the slow axis of the first retardation layer (1/4 wavelength plate) was parallel to the longitudinal direction.

[Measurement of the distance L1 of the lack of glue]

On the second retardation layer side of the optical laminates obtained in the respective Examples and Comparative Examples, an acrylic adhesive layer with a thickness of 20 μm provided on the release film was laminated to obtain an optical laminate with an adhesive layer. For the optical layered body with the adhesive layer, it was confirmed that the side where the glue gap was formed was formed. When the optical layered body with the adhesive layer was cut in the direction perpendicular to the side in the position where the glue layer was formed, A laser microscope was used to measure the profile of its profile. Based on the measured profile, the distance L1 between the position of the innermost end among the ends of the adhesive layer 61 and the position of the outermost end among the ends of the first retardation layer is measured.

〔Weather resistance test〕

An acrylic adhesive layer with a thickness of 20 μm was laminated on the second retardation layer side of the optical layered body obtained in each example and each comparative example, and the acrylic adhesive layer was bonded to a glass plate as a sample for evaluation.

為1.5mm的遮罩而進行，算出評估用試料的4個端邊中之中央部分的反射光的色相(a*b*)、評估用試料的中心部分(矩形的對角線的交叉部分)的反射光的色相(a*b*)之差的平均值作為△a*b*。 A weather resistance test in which the obtained sample for evaluation was left in a sunshine weather meter (weather resistance tester) for 100 hours was performed. Place the sample for evaluation after the weather resistance test on the reflector (manufactured by Alanod, MIRO5 5011GP) with the glass plate facing downward, and measure the reflected light using a spectrophotometer (CM2600d, Konica Minolta Co., Ltd.) Hue. Measuring the diameter of the opening when the installation light enters the integrating sphere from the evaluation sample

Performed for a 1.5mm mask, calculate the hue (a*b*) of the reflected light at the central part of the 4 end edges of the evaluation sample, and the central part of the evaluation sample (the intersection of the diagonal lines of the rectangle) The average value of the difference between the hue (a*b*) of the reflected light of Δa*b*.

△a*b*=(△a*2+△b*2)1/2

In addition, after placing it on the evaluation sample reflector (manufactured by Alanod, MIRO5 5011GP) after the weather resistance test, the reflected light was observed visually from the side of the optical laminate to confirm the color unevenness of the optical laminate. Viewability assessment. The case where the color unevenness is slightly observed is evaluated as A, and the case where the color unevenness is strongly observed is evaluated as B.

[Example 1]

Fig. 3 (a) and (b) are schematic diagrams for explaining the manufacturing method of the adhesive layer in the embodiment. As shown in FIG. 3(a), an adhesive layer 60 with a release film having an adhesive layer 61 formed using an acrylic adhesive with a thickness of 20 μm on the release film 62 is prepared. The adhesive layer 61 contains an ultraviolet absorber. As shown in FIG. 3(a), from the adhesive layer 61 side along a direction parallel to the stacking direction of the adhesive layer 60 with a release film (the arrow direction in the figure) is cut into the tip portion 65a at an angle θ The knife 65 cuts the adhesive layer 60 with the release film into a rectangular shape. In addition, the cutting knife 65 uses a single blade. The cut cross section of the adhesive layer 60 with a release film in the rectangular shape after cutting is a surface in contact with the surface on which the blade is formed on the both sides of the single blade cutting blade 65.

The adhesive layer 61 of the obtained rectangular-shaped adhesive layer 60 with a peeling film was bonded to the first protective layer side (the cellulose triacetate film side) of the polarizing plate produced above, and then the peeling film 62 was peeled off. The surface of the retardation layer laminate produced above, which is exposed by peeling off the COP film on the side of the first retardation layer, is bonded to the surface of the adhesive layer 61 exposed by peeling off the release film 62, and then the second phase The COP film on the difference layer side was peeled off, and an optical laminate having a layer structure of the second protective layer/polarizing layer/first protective layer/adhesive layer 61/first retardation layer/adhesive layer/second retardation layer was obtained. (Circular polarizing plate). In addition, in the production of optical laminates, when bonding the layers, corona treatment is applied to the bonding surface. When bonding, the long and short sides of each layer are aligned, and the absorption axis of the polarizing layer is aligned. It forms 45° with the slow axis direction of the first retardation layer.

The resulting optical layered body has glue-deficient parts formed on the entire circumference. For the glue-deficient portion at any position on each side of the optical layered body, the distance L1 is measured in the above-mentioned procedure, and the average value is calculated. In addition, the resulting optical laminate was subjected to a weather resistance test to measure the change in the hue of the reflected light, and to evaluate the visibility to confirm the state of color unevenness. The results are shown in Table 1. In addition, from the measurement result of the distance L1 in each side, it is considered that the distance L1 of the glue-deficient portion is about the same as the value shown in Table 1 throughout the entire circumference of the optical laminate of this example.

[Example 2 and Comparative Example 1]

As the cutting blade used to cut the adhesive layer 60 (Figure 3(a)) with a release film, a cutting blade (single blade) whose angle θ of the tip portion 65a is larger than that of the user in Example 1 is used ), and the rectangular adhesive layer 60 with a release film was obtained, and the optical laminate was obtained in the same manner as in Example 1 except that the adhesive layer 60 was obtained. The resulting optical layered body has glue-deficient parts formed on the entire circumference. For the glue-deficient portion at any position on each side of the optical layered body, the distance L1 is measured in the above-mentioned procedure, and the average value is calculated. In addition, a weather resistance test was performed on the obtained optical layered body, the change in the hue of the reflected light was measured, and the visibility of the state of color unevenness was evaluated. The results are shown in Table 1. In addition, from the measurement result of the distance L1 in each side, it is considered that the distance L1 of the glue-deficient portion is about the same as the value shown in Table 1 throughout the entire circumference of the optical laminate of this example.

[Table 1]

5: Lack of glue

11: Optical laminate

21: The first retardation layer

31: Adhesive layer

40: Polarizing plate

41: Polarizing layer

42: The first protective layer

43: 2nd protective layer

Claims (11)

An optical laminate having a polarizing layer, an adhesive layer, and a first retardation layer in this order, wherein: The aforementioned first retardation layer is a liquid crystal layer, The aforementioned optical laminate has a glue-deficient part at its end in the surface direction, The glue-deficient portion is in the cross section of the portion where the first retardation layer and the adhesive layer overlap in the stacking direction, so that the innermost end of the end of the adhesive layer is positioned from the first retardation layer. The outermost position of the end of the layer is formed to exceed the range of 0 μm and 10 μm or less from the inside. The optical layered body according to claim 1, wherein the optical layered body has a square shape or a square shape with a notch on at least one side, and the glue-deficient portion is formed on at least one side of the square shape. The optical laminate according to claim 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 the long side, The glue-deficient part is formed on at least one side of the pair of long sides and at least one side of the pair of short sides. The optical laminate according to claim 2, wherein the square shape has a pair of long sides and a pair of short sides, The direction of the absorption axis of the polarizing layer forms an angle of 0°±10° with the long side, The lack of glue is formed on at least one side of the pair of short sides. The optical laminate according to claim 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 is at an angle of 0°±10° with the short side, The glue-deficient part is formed on at least one side of the pair of long sides. The optical layered body according to any one of claims 1 to 5, wherein in the adhesive layer in the glue-deficient portion, the end of the first retardation layer is positioned higher than the end of the surface of the polarizing layer The position is closer to the outside of the surface direction. The optical laminate according to any one of claims 1 to 6, having a protective layer on one or both sides of the aforementioned polarizing layer. The optical laminate according to any one of claims 1 to 7, which further has a second retardation layer on the side opposite to the adhesive layer of the first retardation layer. The optical laminate according to claim 8, wherein the second retardation layer is provided on the first retardation layer via an adhesive layer. The optical laminate according to any one of claims 1 to 9, wherein the adhesive layer contains an ultraviolet absorber. The optical laminate according to any one of claims 1 to 10, which is a circularly polarizing plate.

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