JP2022168459A - Optical laminate and wound body thereof - Google Patents

Abstract

To provide an optical laminate suppressing a deformation, and a wound body thereof.SOLUTION: An optical laminate includes: a first retardation layer including a cured product layer of a polymerizable liquid crystal compound; an adhesive layer; and an optical layer, laminated in this order. The first retardation layer includes, in a planar view, a first region containing an edge part of the first retardation layer, and a second region neighboring the first region. The edge part, the first region and the second region are arranged in this order along a crossover direction crossing over the edge part in the planar view of the first retardation layer. At a surface on the adhesive layer side of the first retardation layer, a fluorine content of the first region is smaller than a fluorine content of the second region.SELECTED DRAWING: Figure 2

Description

The present invention relates to an optical layered body and its wound body.

Display devices such as liquid crystal display devices and organic EL display devices use members including optical films such as polarizing plates and retardation plates. As a member containing such an optical film, after applying a liquid crystal composition containing a polymerizable liquid crystal compound on a substrate layer, a retardation layer is formed by polymerizing and curing the polymerizable liquid crystal compound, and this retardation layer An optical laminate having a polarizer laminated thereon via an adhesive layer is known (for example, Patent Document 1, etc.).

JP 2015-191142 A

The optical layered body is usually manufactured as a long product, and the long optical layered body is marketed, stored, or the like in a state of being wound into a roll. In the wound body obtained by winding the optical layered body into a roll, the entire surface is not smooth in the vicinity of the ends of the wound body in the direction of the winding axis. It was found that there are cases where The optical layered body unwound from the wound body whose surface has been deformed may not have the entire film surface flattened along the horizontal plane and may be deformed. Not suitable for application to devices, etc.

An object of the present invention is to provide an optical layered body having a retardation layer containing a cured product layer of a polymerizable liquid crystal compound, the optical layered body being suppressed in deformation, and a wound body thereof.

The present invention provides the following optical layered body.
[1] An optical laminate in which a first retardation layer containing a cured product layer of a polymerizable liquid crystal compound, an adhesive layer, and an optical layer are laminated in this order,
The first retardation layer has a first region including an end portion of the first retardation layer and a second region adjacent to the first region in plan view,
The end, the first region, and the second region are arranged in this order along a crossing direction that intersects the end in a plan view of the first retardation layer,
The optical laminate, wherein the fluorine content in the first region is lower than the fluorine content in the second region on the surface of the first retardation layer facing the adhesive layer.
[2] The first region includes a region between the end and a position 100 μm from the end in the intersecting direction,
The second region includes a region between a boundary position between the first region and the second region and a position 1000 μm from the end in the crossing direction,
On the adhesive layer side surface of the first retardation layer, the fluorine content F1 [atm%] at a point 100 μm from the end, and the fluorine content F2 [atm%] at a point 1000 μm from the end The optical laminate according to [1], which satisfies the relationship of the following formula (A).
F1 [atm%] ≤ F2 [atm%] - 2.5 [atm%] (A)
[3] The optical laminate according to [1] or [2], wherein the first retardation layer has a thickness of 0.5 μm or more and 10 μm or less.
[4] The planar shape of the first retardation layer is a rectangle,
The optical layered body according to any one of [1] to [3], wherein the edge is an edge on the periphery of the rectangle.
[5] The first retardation layer has a through hole penetrating in the stacking direction of the optical layered body,
The optical laminate according to any one of [1] to [4], wherein the end portion is an end portion located on the periphery of the through hole.
[6] The optical laminate according to any one of [1] to [5], wherein the optical layer is a second retardation layer containing a cured layer of a polymerizable liquid crystal compound.
[7] further comprising a linear polarizer,
The optical laminate according to [6], wherein the linear polarizer is laminated on the side of the first retardation layer or the optical layer opposite to the adhesive layer side.
[8] The optical laminate according to any one of [1] to [5], wherein the optical layer contains a linear polarizer.
[9] further comprising a third retardation layer comprising a cured layer of a polymerizable liquid crystal compound,
The optical laminate according to [8], wherein the third retardation layer is laminated on the side of the first retardation layer opposite to the adhesive layer side.
[10] A wound body obtained by winding the optical layered body according to any one of [1] to [9] into a roll.

According to the present invention, deformation of an optical layered body having a retardation layer containing a cured product layer of a polymerizable liquid crystal compound can be suppressed.

1 is a cross-sectional view schematically showing an optical layered body according to one embodiment of the present invention; FIG. 2 is a plan view schematically showing an example of the first retardation layer side of the optical layered body shown in FIG. 1. FIG. 2 is a plan view schematically showing another example of the first retardation layer side of the optical layered body shown in FIG. 1. FIG. 2 is a plan view schematically showing still another example of the first retardation layer side of the optical layered body shown in FIG. 1. FIG. FIG. 4 is a cross-sectional view schematically showing an optical layered body according to another embodiment of the present invention; FIG. 5 is a cross-sectional view schematically showing an optical layered body according to still another embodiment of the present invention; FIG. 5 is a cross-sectional view schematically showing an optical layered body according to still another embodiment of the present invention; FIG. 5 is a cross-sectional view schematically showing an optical layered body according to still another embodiment of the present invention;

Hereinafter, embodiments of the optical laminate of the present invention will be described with reference to the drawings. You may combine each embodiment shown below arbitrarily. In each embodiment and each drawing, members that are the same as or correspond to those previously described are given the same or corresponding reference numerals, and their description may not be repeated. In addition, each drawing is shown by appropriately adjusting the scale for easy understanding of each component, and the scale of each component shown in the drawing does not necessarily match the scale of the actual component.

[Embodiment 1]
FIG. 1 is a cross-sectional view schematically showing an optical laminate according to this embodiment. 2 and 3 are plan views schematically showing the first retardation layer side of the optical laminate shown in FIG. 1. FIG.

As shown in FIG. 1, the optical laminate 1 includes a first retardation layer 10, an adhesive layer 20, and an optical layer 30 laminated in this order. The first retardation layer 10 includes a cured product layer of a polymerizable liquid crystal compound, and may further include an alignment layer for orienting the polymerizable liquid crystal compound. The first retardation layer 10 may be, for example, a λ/4 retardation layer, a λ/2 retardation layer, a positive C layer, or the like. The adhesive layer 20 is a layer obtained by curing an adhesive composition. The optical layer 30 is a layer having optical functions such as transmitting, reflecting, and absorbing light. The first retardation layer 10 and the adhesive layer 20 are usually provided so as to be in direct contact with each other. The adhesive layer 20 and the optical layer 30 are usually provided so as to be in direct contact with each other.

The planar view shape of the optical layered body 1 is not particularly limited, and may be, for example, a rectangle, a square, or a shape other than a rectangle and a square. Other shapes include, for example, polygons, circles, ovals. The optical layered body 1 may have a rectangular, square, or other shape with a recess formed on the outer periphery, or may have a rectangular, square, or polygonal shape with rounded corners (R It may have a rounded corner shape, or may have a through hole as described later. The optical layered body 1 may be a sheet body or a long film-like body. When the optical layered body 1 is a long film-like material, the optical layered body 1 can be wound into a roll to form a wound body.

As shown in FIGS. 2 and 3, the first retardation layer 10 of the optical layered body 1 includes, in plan view, a first region 11a including the end portion Sa and a second region 12a adjacent to the first region 11a. have The end Sa, the first region 11a, and the second region 12a are arranged in this order along a first crossing direction X1 (intersecting direction) that intersects the end Sa in a plan view of the first retardation layer 10. there is The end portion Sa is, for example, an end portion at the outer peripheral edge of the first retardation layer 10, and when the planar view shape of the first retardation layer 10 is rectangular as shown in FIGS. It can be a peripheral edge. The end portion Sa may include the entire side of the first retardation layer 10 as shown in FIGS. 2 and 3, or may be a part of the side. The first crossing direction X1 is not particularly limited as long as it crosses the end portion Sa, and may be a direction orthogonal to the end portion Sa as shown in FIGS.

On the adhesive layer 20 side surface of the first retardation layer 10 of the optical layered body 1, the fluorine content in the first region 11a is smaller than the fluorine content in the second region 12a. As used herein, the fluorine content refers to the content of fluorine atoms. The content of fluorine atoms on the adhesive layer 20 side surface of the first retardation layer 10 can be measured by the method described in Examples below. The fluorine atoms present in the first retardation layer 10 are contained in the material for forming the first retardation layer 10, for example fluorine atoms contained in the leveling agent.

In the production of the optical laminate 1, the adhesive layer 20 is formed by applying the adhesive composition on the first retardation layer 10 or by spreading the adhesive composition on the first retardation layer 10. It is formed. When the fluorine content in the region near the end Sa on the surface of the first retardation layer 10 on the adhesive layer 20 side is the same as or higher than the region adjacent to the region, the region near the end Sa It has been found that the thickness of the adhesive layer formed is increased. This is because the adhesive composition tends to stay in the area near the end Sa having a fluorine content as described above due to repelling and surface tension of the adhesive composition applied or spread over the area. it is conceivable that. If the adhesive composition stays in the region near the edge Sa, the thickness of the adhesive layer formed between the first retardation layer and the optical layer becomes uneven. When such an optical layered body having an adhesive layer having an uneven thickness is wound into a roll, the entire surface of the wound body is not smooth, and unevenness tends to occur particularly in the region near the end Sa. , the optical laminate unwound from the roll may be deformed.

On the other hand, in the optical laminate 1 of the present embodiment, as described above, the first region including the end portion Sa of the first retardation layer 10 on the surface of the first retardation layer 10 on the side of the adhesive layer 20 The fluorine content of 11a is less than the fluorine content of the second region 12a. Therefore, when the adhesive composition is applied or spread on the first retardation layer 10 in manufacturing the optical layered body 1, the occurrence of stagnation of the adhesive composition in the first region 11a is suppressed. be able to. As a result, the thickness of the adhesive layer 20 formed on the first retardation layer 10 can be easily formed uniformly over the entire surface, so that the surface of the wound body obtained by winding the optical layered body 1 in a roll shape has no unevenness. It is hard to occur, and the whole surface tends to be smooth. Therefore, deformation of the optical layered body 1 unwound from the wound body can be suppressed.

The fluorine content of the adhesive layer 20 side surface of the first retardation layer 10 of the optical layered body 1 usually increases in the first cross direction X1 from the end portion Sa included in the first region 11a. This increase in fluorine content may be continuous or stepwise.

The first region 11a is a region including the end portion Sa of the first retardation layer, and the fluorine content of the surface of the first retardation layer 10 on the side of the adhesive layer 20 is adjacent to the first cross direction X1. The range is not particularly limited as long as it is a region smaller than the second region 12a. As shown in FIGS. 2 and 3, the first region 11a includes a region between an end Sa of the first retardation layer 10 and a position P1a separated from the end Sa by 100 μm in the first cross direction X1. You can stay. For example, the first region 11a may be a region from the end Sa to the position P1a, or, as shown in FIGS. may include a range greater than 100 μm.

Two or more first regions 11 a may be provided in the first retardation layer 10 . For example, when the first retardation layer 10 has a rectangular shape, as shown in FIG. 3, the first region 11a includes the first retardation layer 10 so as to include ends Sa and Sa' of a pair of opposing sides. There may be two in layer 10 . When the first retardation layer 10 has two or more first regions 11a, the fluorine content of each first region 11a may be the same or different.

The second region 12a is a region adjacent to the first region 11a in the first cross direction X1, and the fluorine content of the surface of the first retardation layer 10 on the adhesive layer 20 side is higher than that of the first region 11a. The range is not particularly limited as long as it is a large area. As shown in FIGS. 2 and 3, the second region 12a is a region between the boundary position between the first region 11a and the second region 12a and a position P2a 1000 μm from the end Sa in the first cross direction X1. may contain For example, the second region 12a may be a region extending from the boundary position to the position P2a, or may extend from the end Sa to the first intersecting direction X1 so as to include the position P2a as shown in FIGS. may include a range exceeding 1000 μm. The boundary position between the first region 11a and the second region 12a may be the position P1a, or may be at a position exceeding 100 μm in the first cross direction X1 from the end Sa (a position exceeding the position P1a). good too. The second area 12a may include the position P2a.

Two or more second regions 12 a may be provided in the first retardation layer 10 . For example, when the first retardation layer 10 is rectangular, as shown in FIG. 3, two second regions 12a, 12a may be provided so as to be adjacent to the two first regions 11a, 11a, respectively. However, one second region 12a may be provided adjacent to both of the two first regions 11a. When the first retardation layer 10 has two or more second regions 12a, the fluorine content of each second region 12a may be the same or different.

The first region 11a includes the region between the end Sa and the position P1a, and the second region 12a includes the region between the boundary position between the first region 11a and the second region 12a and the position P2a. In this case, the fluorine content F1 [atm%] at the position P1a and the fluorine content F2 [atm%] at the position P2a on the adhesive layer 20 side surface of the first retardation layer 10 are expressed by the following formula (A) It is preferable to satisfy the relationship of
F1 [atm%] ≤ F2 [atm%] - 2.5 [atm%] (A)

F1 may be F2-2.8 or less, F2-3.0 or less, or F2-3.1 or less. When F1 is within the range of the above formula (A), it becomes easy to suppress the occurrence of stagnation of the adhesive composition in the first region 11a of the first retardation layer 10 . Therefore, it is possible to make it difficult for unevenness to occur on the surface of the wound body of the optical layered body 1, so that deformation of the optical layered body 1 unwound from the wound body can be suppressed.

On the surface of the first retardation layer 10 on the adhesive layer 20 side, the fluorine content in the region between the end Sa and the position P1a is preferably smaller than the fluorine content F1 at the position P1a. For example, the fluorine content F50 at a position 50 μm from the end Sa may be F1-1.0 or less, F1-1.5 or less, or F1-2.0 or less. It may be F2-3.0 or less, F2-4.0 or less, or F2-5.0 or less.

On the adhesive layer 20 side surface of the first retardation layer 10, the fluorine content between the position P1a and the position P2a is larger than the fluorine content F1 at the position P1a and smaller than the fluorine content at the position P2a. is preferred. For example, the fluorine content F500 at a position 500 μm from the end Sa may be F2-0.3 or more, F2-0.5 or more, or F2-0.7 or more. It may be F1+1.0 or more, F1+1.5 or more, or F1+2.0 or more.

The fluorine content of the first region 11a and the second region 12a of the first retardation layer 10 can be adjusted, for example, by the following method. First, a raw retardation layer containing fluorine atoms is prepared. For the original retardation layer, for example, the first substrate layer is coated with a composition obtained by mixing a material containing a polymerizable liquid crystal compound and a fluorine atom to form a coating layer, and the polymerizable liquid crystal compound in the coating layer is It can be obtained by polymerizing and curing. The coating layer may be formed on an alignment layer formed on the first substrate layer. Materials containing fluorine atoms include, for example, leveling agents. A heat treatment is applied to the end portion of the original fabric laminate of the first base material layer and the original fabric retardation layer obtained as described above. As a result, the fluorine content of the first region 11a including the end portion Sa is reduced, so that the fluorine content of the first region 11a can be made smaller than the fluorine content of the second region 12a.

The heat treatment applied to the edge of the raw fabric laminate is not particularly limited as long as it is a treatment that can reduce the fluorine content of the first retardation layer 10. For example, the edge of the raw fabric laminate is heated with a flame. Examples include flame treatment or Itro treatment, and heat ray treatment in which the raw fabric laminate is broiled with hot wires. Roasting with a flame or hot wire may be carried out by quickly stroking the end face of the raw fabric laminate with the heat of a flame or hot wire. The heat treatment may be performed on the end face of one raw fabric laminate, but in the case of a long raw fabric laminate, it is applied to the end face of the original fabric roll obtained by winding the original fabric laminate into a roll. Alternatively, in the case of a sheet-like raw material laminate, it may be performed on the end face of a laminate structure in which a plurality of raw material laminates (for example, 10 to 50 sheets) are stacked.

The optical laminate 1 can be produced, for example, by laminating the first retardation layer 10 formed on the first substrate layer and the optical layer 30 via the adhesive layer 20 . The adhesive composition for forming the adhesive layer 20 may be applied to the first retardation layer 10 side, may be applied to the optical layer 30 side, or may be applied to both of them. good. When the first retardation layer 10 and the optical layer 30 are laminated via the adhesive composition applied to at least one of the first retardation layer 10 and the optical layer 30, the first retardation layer 10 and The adhesive composition is spread between the optical layers 30 . Examples of the coating method of the adhesive composition include known coating methods used in the field of optics. Specifically, spin coating, extrusion, gravure coating, die coating, slit coating, bar A coating method, a comma coating method, an applicator method, a flexographic method, and the like can be mentioned. The adhesive layer 20 can be formed by laminating the first retardation layer 10 and the optical layer 30 via an adhesive composition and then curing the laminate. After forming the adhesive layer 20, the first base material layer may be peeled off.

A wound body obtained by winding the optical layered body 1 into a roll can be obtained, for example, by winding it around a core. The length of the wound body in the winding axial direction is not particularly limited, but is usually 300 mm or more and 2000 mm or less, may be 1000 mm or more, may be 1200 mm or more, or may be 1800 mm or less. or 1500 mm or less. The diameter of the wound body is not particularly limited, but is usually 50 mm or more and 1000 mm or less, may be 100 mm or more, may be 300 mm or more, may be 800 mm or less, or may be 500 mm or less. There may be.

[Embodiment 2]
4 is a plan view schematically showing another example of the first retardation layer side of the optical laminate shown in FIG. 1. FIG. FIG. 4 shows a plan view of the first retardation layer 10 in the case where the first retardation layer 10 has through holes 15 penetrating in the stacking direction of the optical layered body 1 .

As shown in FIG. 4 , the optical layered body 1 has through holes 15 penetrating in at least the first retardation layer 10 in the stacking direction of the optical layered body 1 . The optical layer 30 and the adhesive layer 20 forming the optical laminate 1 may have through holes at positions corresponding to the through holes 15 of the first retardation layer 10 . Further, the optical layered body 1 may have a through-hole so as to penetrate in the stacking direction, and all the layers constituting the optical layered body 1 may have a through-hole.

The through-holes 15 of the first retardation layer 10 are not particularly limited in shape, size, number, etc., as long as they penetrate the optical layered body 1 in the stacking direction. The shape of the through-hole 15 is, for example, a circle (perfect circle); an ellipse; an oval; a polygon such as a triangle or a square; It can be a polygon or the like. FIG. 4 shows a case where the through hole 15 is circular (perfectly circular).

The diameter of the through hole 15 is preferably 0.5 mm or more, and may be 1 mm or more, 2 mm or more, or 3 mm or more. The diameter of the through hole 15 is preferably 20 mm or less, and may be 15 mm or less, 10 mm or less, or 7 mm or less. In this specification, the diameter of the through-hole 15 refers to the diameter of the circle when the shape of the through-hole is circular (perfectly circular) in plan view. In some cases, it refers to the diameter of the circumscribed circle (perfect circle) of the through-hole in plan view.

The number of through-holes 15 that the first retardation layer 10 has may be one, or two or more. When having two or more through-holes 15, the shape and size may be the same or different.

The first retardation layer 10 shown in FIG. 4 has a first region 11b including the end portion Sb and a second region 12b adjacent to the first region 11b in plan view. The end Sb, the first region 11b, and the second region 12b are arranged in this order along a second crossing direction X2 (intersecting direction) intersecting the end Sb in a plan view of the first retardation layer 10. there is When the first retardation layer 10 has the through holes 15, the end Sb may be the peripheral end of the through hole 15 as shown in FIG. There may be. The second crossing direction X2 is not particularly limited as long as it crosses the end Sb. is not limited to the second crossing direction X2 shown in FIG. 4, but may be the same direction as the first crossing direction X1 shown in FIGS. 2 and 3, for example.

Also in the first retardation layer 10 shown in FIG. 4, the first region 11a including the edge portion Sa at the outer peripheral edge of the first retardation layer 10 and the second region 12a adjacent thereto have been described in the previous embodiment. As shown in FIGS. 2 and 3, in the surface of the first retardation layer 10 of the optical layered body 1 on the side of the adhesive layer 20, the fluorine content of the first region 11b including the edge Sb is the second region 12b less than the fluorine content of

The fluorine content of the adhesive layer 20 side surface of the first retardation layer 10 of the optical layered body 1 usually increases along the second cross direction X2 from the end Sb included in the first region 11b. This increase in fluorine content may be continuous or stepwise.

The first region 11b is a region including the end portion Sb of the first retardation layer 10, and the fluorine content of the surface of the first retardation layer 10 on the side of the adhesive layer 20 is adjacent to the second cross direction X2. The range is not particularly limited as long as it is a region smaller than the second region 12b. The first region 11b may include, as shown in FIG. 4, a region between the end Sb and a position P1b 100 μm from the end Sb in the second cross direction X2. For example, the first region 11b may be a region from the end Sb to the position P1b, or, as shown in FIG. It may include a range that exceeds. Two or more first regions 11b may be provided in the first retardation layer 10, and the fluorine content of each first region 11b may be the same or different.

The second region 12b is a region adjacent to the first region 11b in the second cross direction X2, and the fluorine content of the surface of the first retardation layer 10 on the adhesive layer 20 side is higher than that of the first region 11b. The range is not particularly limited as long as it is a large area. As shown in FIG. 4, the second region 12b includes a region between the boundary position between the first region 11b and the second region 12b and a position P2b 1000 μm from the end Sb in the second cross direction X2. You can For example, the second region 12b may be a region from the boundary position to the position P2b, or may extend from the end Sb to the first cross direction X1 by more than 1000 μm so as to include the position P2b as shown in FIG. It may contain a range. The boundary position between the first region 11b and the second region 12b may be the position P1b, or may be at a position exceeding 100 μm in the second cross direction X2 from the end Sb (a position exceeding the position P1b). good too. Two or more second regions 12b may be provided in the first retardation layer 10, and the fluorine content of each second region 12b may be the same or different.

When the first region 11b includes the region between the end Sb and the position P1b and the second region 12b includes the boundary position and the region between the end Sb and the position P2b, the first phase difference On the surface of the layer 10 on the side of the adhesive layer 20, the fluorine content F1 [atm%] at the position P1b and the fluorine content F2 [atm%] at the position P2b satisfy the relationship of the above formula (A). is preferred. Preferred ranges for F1, F50, and F500 are as described above.

As described above, even when the first retardation layer 10 is provided with the first region 11b and the second region 12b, the surface of the wound body obtained by winding the optical layered body 1 in a roll shape is uneven. can be suppressed and the smoothness of the entire surface can be improved. This can be expected to suppress deformation of the optical layered body 1 unwound from the roll.

The fluorine content of the first region 11b and the second region 12b of the first retardation layer 10 can be adjusted, for example, by the method described in the previous embodiment.

A specific layer structure of the optical layered body will be described below.
(Example (1) of optical laminate)
5 and 6 are cross-sectional views schematically showing the optical layered body according to this embodiment. The optical layered bodies 2 and 3 shown in FIGS. 5 and 6 are those in which the optical layer 30 in the optical layered body 1 shown in FIG.

The optical laminates 2 and 3, as shown in FIGS. 5 and 6, include a first retardation layer 10, an adhesive layer 20, and a second retardation layer 32 (optical layer 30). The second retardation layer 32 may be a stretched film, or may include a cured layer of a polymerizable liquid crystal compound. When the second retardation layer 32 contains the cured material layer, the second retardation layer 32 may further contain an orientation layer for orienting the polymerizable liquid crystal compound. The optical layered bodies 2 and 3 or the first retardation layer 10 may have through-holes penetrating in the stacking direction of the optical layered bodies 2 and 3 .

As shown in FIG. 5, the optical laminate 2 includes a first bonding layer 21 and a polarizing plate 35 including a linear polarizer on the opposite side of the first retardation layer 10 from the adhesive layer 20 side. They may be laminated in order, or the second substrate layer 31 may be laminated on the side opposite to the adhesive layer 20 side of the second retardation layer 32 . Alternatively, in the optical laminate 2, a second bonding layer and a polarizing plate including a linear polarizer may be laminated in this order on the side of the second retardation layer 32 opposite to the adhesive layer 20 side. However, the first substrate layer may be laminated on the opposite side of the adhesive layer 20 of the first retardation layer 10 . The polarizing plate 35 has a protective layer on one side or both sides of the linear polarizer, the linear polarizer and the protective layer may be laminated via an adhesive composition or a pressure-sensitive adhesive composition, or the linear polarizer A protective layer may be laminated directly on top. The second bonding layer is an adhesive layer that is a cured product of the adhesive composition, or an adhesive layer that is formed from the adhesive composition.

The optical laminate 3 may have a first substrate layer 18 on the opposite side of the first retardation layer 10 to the adhesive layer 20 side, as shown in FIG. 6, the optical layered body 3 may further have a second substrate layer 31 on the side of the second retardation layer 32 opposite to the adhesive layer 20 side.

When the second retardation layer 32 includes a cured product layer of a polymerizable liquid crystal compound, the second retardation layer 32 may have regions with different fluorine contents on the surface on the adhesive layer 20 side. Specifically, the second retardation layer 32 has, in plan view, a 1' region including an end portion of the second retardation layer 32, and a 2' region adjacent to the 1' region, In a plan view of the second retardation layer 32, when the end portion, the 1' region, and the 2' region are arranged in this order along the cross direction that intersects the end portion, the 1' region may be less than the fluorine content of the 2' region. The end of the second retardation layer 32 may be the end on the outer periphery of the second retardation layer 32, or the end of the second retardation layer 32 on the periphery of the through hole. good too.

Regarding the end portion, the 1' region, and the 2' region, the end portions Sa, Sa', Sb, the first regions 11a, 11b, and the second regions 12a, 12b of the first retardation layer 10 are explained, respectively. can be configured as For example, the 1' region can include an end included in the 1' region of the second retardation layer 32 and a region between a position P1' 100 μm from this end in the cross direction. The 2' region is between the boundary position between the 1' region and the 2' region of the second retardation layer 32 and the position P2' 1000 μm in the cross direction from the end included in the 1' region. can contain regions of

On the surface of the second retardation layer 32 on the side of the adhesive layer 20, the fluorine content F1 [atm%] at the position P1′ and the fluorine content F2 [atm%] at the position P2′ are expressed by the above-described formula (A ) is preferably satisfied. Preferred ranges for F1, F50, and F500 are as described above.

In the optical laminates 2 and 3, the combination of the first retardation layer 10 and the second retardation layer 32 includes a λ/2 retardation layer and a λ/4 retardation layer, or a λ/4 retardation layer and a positive C layer is mentioned. When one of the first retardation layer 10 and the second retardation layer 32 is a λ/4 retardation layer, the optical laminate 2 constitutes a circularly polarizing plate.

The optical layered body 3 shown in FIG. can be produced by laminating the second laminate with the adhesive layer 20 interposed therebetween. The adhesive composition for forming the adhesive layer 20 may be applied to the first retardation layer 10 side of the first laminate, or may be applied to the second retardation layer 32 side of the second laminate. or both. Examples of the method of applying the adhesive composition include the methods described above. The adhesive layer can be formed by laminating the first laminate and the second laminate via the adhesive composition and then curing the laminate.

The optical layered body 2 shown in FIG. 5 is obtained, for example, by peeling the first base material layer 18 from the optical layered body 3 shown in FIG. It can be manufactured by laminating the polarizing plate 35 .

(Example (2) of optical layered body)
7 and 8 are cross-sectional views schematically showing the optical layered body according to this embodiment. 7 and 8, the optical layer 30 in the optical layered body 1 shown in FIG. 1 is a polarizing plate 35 containing a linear polarizer. The optical laminates 4 and 5, as shown in FIGS. 7 and 8, include a first retardation layer 10, an adhesive layer 20, and a polarizing plate 35 (optical layer 30). The optical layered bodies 4 and 5 or the first retardation layer 10 may have a through-hole penetrating the optical layered bodies 4 and 5 in the stacking direction.

The optical laminate 4 may have a first substrate layer 18 on the opposite side of the first retardation layer 10 to the adhesive layer 20, as shown in FIG.

As shown in FIG. 8, the optical laminate 5 has a third bonding layer 23 and a third retardation layer 33 laminated in this order on the side of the first retardation layer 10 opposite to the adhesive layer 20 side. may A third substrate layer 34 may be laminated on the side of the third retardation layer 33 opposite to the third bonding layer 23 .

The third retardation layer 33 may be a stretched film, or may include a cured layer of a polymerizable liquid crystal compound. When the third retardation layer 33 includes a cured product layer of a polymerizable liquid crystal compound, the surface on the third bonding layer 23 side has regions with different fluorine contents, as described for the second retardation layer 32. You may have The third bonding layer 23 is an adhesive layer or pressure-sensitive adhesive layer that is a cured product of an adhesive composition.

When the first retardation layer 10 of the optical laminate 4 is a λ/4 retardation layer, the optical laminate 4 constitutes a circularly polarizing plate. In the optical laminate 5, the combination of the first retardation layer 10 and the third retardation layer 33 includes a λ/2 retardation layer and a λ/4 retardation layer, or a λ/4 retardation layer and a positive C layer. is mentioned. When one of the first retardation layer 10 and the third retardation layer 33 is a λ/4 retardation layer, the optical laminate 5 constitutes a circularly polarizing plate.

The optical layered body 4 shown in FIG. 7 includes, for example, a first layered body in which a first retardation layer 10 is formed on a first substrate layer 18, a polarizing plate 35 including a linear polarizer, and an adhesive layer. 20 by lamination. The adhesive composition for forming the adhesive layer may be applied to the first retardation layer 10 side of the first laminate, may be applied to the polarizing plate 35 side, or may be applied to both of them. You can apply it. Examples of the method of applying the adhesive composition include the methods described above. The adhesive layer can be formed by laminating the first laminate and the polarizing plate via an adhesive composition and then curing the laminate.

The optical layered body 5 shown in FIG. 8 is obtained, for example, by peeling the first base material layer 18 from the optical layered body 4 shown in FIG. , by laminating a third laminate in which the third retardation layer 33 is formed on the third substrate layer 34 .

The thickness of the optical laminates 1 to 5 is not particularly limited, but may be 500 μm or less, 300 μm or less, or 200 μm or less. The thickness of the optical layered bodies 1 to 5 may be 10 μm or more, or may be 50 μm or more. An optical layered body having a thickness of 200 μm or less, in which the fluorine content of the adhesive layer side surface of the first retardation layer is not adjusted as in the optical layered bodies 1 to 5, is wound into a roll. When rotated, the optical layered body tends to be easily deformed. On the other hand, by adjusting the fluorine content on the adhesive layer side of the first retardation layer as in the optical laminates 1 to 5, even when the thickness is 200 μm or less, the optical laminates 1 to 5 It becomes easier to suppress the deformation that occurs.

Materials and the like used in the optical layered bodies 1 to 5 described above will be specifically described below.
(First retardation layer)
The first retardation layer is not particularly limited as long as it includes a cured product layer of a polymerizable liquid crystal compound. The first retardation layer may include an orientation layer for orienting the polymerizable liquid crystal compound in addition to the cured product layer. The first retardation layer contains fluorine atoms.

The thickness of the first retardation layer is not particularly limited, but may be 10 μm or less, may be 8 μm or less, may be 5 μm or less, or may be 0.5 μm or more. It may be 0.8 μm or more, or 1 μm or more. When the thickness of the first retardation layer is within the above range, the fluorine content of the first region on the adhesive layer side surface of the first retardation layer is made smaller than the fluorine content of the second region. Thereby, deformation of the optical layered body can be effectively suppressed.

The first retardation layer can be formed using a first composition containing a polymerizable liquid crystal compound, the first composition is a leveling agent containing fluorine atoms (hereinafter referred to as "leveling agent (F)" ) is preferably included. As the leveling agent (F), "Megafac (registered trademark) R-08", "R-30", "R-90", "F-410", "F-411", " F-443, F-445, F-470, F-471, F-477, F-479, F-482, F -483" and "F-556" (DIC Corporation); "Surflon (registered trademark) S-381", "S-382", "S-383", "S-393", "SC-101", "SC-105", "KH-40", and "SA-100" (AGC Seimi Chemical Co., Ltd.); ); "F-top EF301", "F-top EF303", "F-top EF351", and "F-top EF352" (Mitsubishi Materials Electronic Chemicals Co., Ltd.).

A polymerizable liquid crystal compound is a compound having a polymerizable reactive group and exhibiting liquid crystallinity. The polymerizable reactive group is a group that participates in a polymerization reaction, and is preferably a photopolymerizable reactive group. A photopolymerizable reactive group refers to a group that can participate in a polymerization reaction by an active radical generated from a photopolymerization initiator, an acid, or the like. Photopolymerizable functional groups include vinyl group, vinyloxy group, 1-chlorovinyl group, isopropenyl group, 4-vinylphenyl group, acryloyloxy group, methacryloyloxy group, oxiranyl group and oxetanyl group. Among them, an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxiranyl group and an oxetanyl group are preferred, and an acryloyloxy group is more preferred. The type of polymerizable liquid crystal compound is not particularly limited, and rod-like liquid crystal compounds, discotic liquid crystal compounds, and mixtures thereof can be used. The liquid crystallinity of the polymerizable liquid crystal compound may be thermotropic liquid crystal or lyotropic liquid crystal, and the phase order structure may be nematic liquid crystal or smectic liquid crystal.

The leveling agent (F) contained in the first composition is preferably 0.01 parts by mass or more, more preferably 0.05 parts by mass or more with respect to 100 parts by mass of the polymerizable liquid crystal compound, and , preferably 5 parts by mass or less, more preferably 3 parts by mass or less.

The first composition may further contain a polymerization initiator, a photosensitizer, a polymerization inhibitor, a solvent, a leveling agent other than the leveling agent (F), and the like.

The alignment layer that the first retardation layer may contain has an alignment control force that aligns the polymerizable liquid crystal compound in a desired direction. The alignment layer preferably has solvent resistance so that it does not dissolve when the first composition is applied or the like, and has heat resistance in heat treatment for removing the solvent and for aligning the polymerizable liquid crystal compound. Examples of the alignment layer independently include an alignment layer containing an alignment polymer, a photo-alignment layer, and a groove alignment layer in which an uneven pattern or a plurality of grooves are formed on the surface for alignment.

(Second retardation layer, third retardation layer)
The second retardation layer and the third retardation layer may each independently be a layer composed of a stretched film, or may include a cured product layer of a polymerizable liquid crystal compound. When the second retardation layer and the third retardation layer include a cured product layer of a polymerizable liquid crystal compound, the second retardation layer and the third retardation layer include an alignment layer for orienting the polymerizable liquid crystal compound. or the cured product layer may contain fluorine atoms.

The thicknesses of the second retardation layer and the third retardation layer are not particularly limited, but each independently may be 50 μm or less, may be 30 μm or less, or may be 15 μm or less. , 13 μm or less, 10 μm or less, 5 μm or less, usually 0.1 μm or more, 0.5 μm or more, or 1 μm or more. It may be 5 μm or more, or it may be 10 μm or more.

When the second retardation layer and the third retardation layer are stretched films, a film formed of a resin material exemplified in the first base layer, the second base layer, and the third base layer described later is uniaxially stretched. Oriented or biaxially oriented stretched films can be used.

When the second retardation layer and the third retardation layer contain a cured product layer of a polymerizable liquid crystal compound, the cured product layer can be formed using a second composition containing a polymerizable liquid crystal compound. As the polymerizable liquid crystal compound, the compound described for the first retardation layer can be used. In addition to the polymerizable liquid crystal compound, the second composition may contain a polymerization initiator, a photosensitizer, a polymerization inhibitor, a solvent, a leveling agent (F), a leveling agent other than the leveling agent (F), and the like. good.

When the second retardation layer and the third retardation layer include an alignment layer, the alignment layer described in the alignment layer that the first retardation layer may contain can be used as the alignment layer.

(First substrate layer, second substrate layer, third substrate layer)
It is preferable that the first base layer, the second base layer, and the third base layer are films each independently formed of a resin material. As the resin material, it is preferable to use, for example, a material that is excellent in transparency, mechanical strength, thermal stability, and the like. The resin material is preferably a thermoplastic resin, for example, cellulose resins such as triacetyl cellulose; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; polyethersulfone resins; polysulfone resins; polycarbonate resins; Polyamide resins such as nylon and aromatic polyamides; polyimide resins; polyolefin resins such as polyethylene, polypropylene, and ethylene/propylene copolymers; cyclic polyolefin resins having cyclo and norbornene structures; (meth) acrylic resins; polyarylate-based resins; polystyrene-based resins; polyvinyl alcohol-based resins, and the like. "(Meth)acryl" means at least one selected from the group consisting of acryl and methacryl.

Each of the first substrate layer, the second substrate layer, and the third substrate layer may independently have a single-layer structure, may have a multilayer structure, or may have a multilayer structure. , each layer may be formed of the same resin material, or may be formed of different resin materials.

The thicknesses of the first base layer, the second base layer, and the third base layer are each independently preferably 5 to 300 μm, and preferably 10 to 200 μm, from the viewpoint of strength and workability. more preferred.

(optical layer)
The optical layer is a layer having optical functions such as transmitting, reflecting, and absorbing light, and may be a resin film or a liquid crystal layer. The optical layer may have a single layer structure, or may have a laminated structure of two or more layers laminated via a bonding layer or the like.

As the optical layer, a linear polarizer; a polarizing plate in which a protective layer is laminated on one or both sides of a linear polarizer; a polarizing plate with a protective film in which a protective film is laminated on one side of the polarizing plate; a reflective film; film; brightness enhancement film; optical compensation film; film with antiglare function; retardation film or retardation layer;

(Polarizer)
The optical layered body may contain a polarizing plate as an optical layer, or may contain a polarizing plate separately from the optical layer. A polarizing plate is obtained by laminating a protective layer on one or both sides of a linear polarizer. When the polarizing plate has a protective layer laminated only on one side, in the optical laminate, the protective layer may be provided on the side opposite to the first retardation layer side or the second retardation layer side of the linear polarizer. preferable.

The linear polarizer and the protective layer are preferably bonded via an adhesive layer or a pressure-sensitive adhesive layer. The adhesive composition for forming the adhesive layer and the pressure-sensitive adhesive composition for forming the pressure-sensitive adhesive layer include the adhesive composition and pressure-sensitive adhesive composition described below. Examples of protective layers include films formed of the resin materials exemplified for the first base layer, the second base layer, and the third base layer.

The thickness of the polarizing plate may be, for example, 200 μm or less, 120 μm or less, 100 μm or less, 50 μm or less, or 30 μm or less. However, it is usually 10 μm or more, may be 15 μm or more, or may be 20 μm or more.

(linear polarizer)
Linear polarizers include, for example, a PVA polarizing layer in which a dichroic dye is adsorbed and oriented on a polyvinyl alcohol resin film, and a liquid crystal polarizing layer in which a dichroic dye is oriented in a cured layer of a polymerizable liquid crystal compound. be done.

The polyvinyl alcohol-based resin that constitutes the polyvinyl alcohol-based resin film can be obtained by saponifying a polyvinyl acetate-based resin. Examples of polyvinyl acetate-based resins include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and monomers copolymerizable with vinyl acetate. Monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth)acrylamides having an ammonium group.

The degree of saponification of the polyvinyl alcohol resin is usually 85-100 mol %, preferably 98 mol % or more. The polyvinyl alcohol-based resin may be modified, and for example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used. The degree of saponification and the average degree of polymerization of the polyvinyl alcohol resin are usually 1,000-10,000, preferably 1,500-5,000. The average degree of polymerization of the polyvinyl alcohol-based resin can be determined according to JIS K6726.

Generally, a film obtained by forming a polyvinyl alcohol-based resin is used as a raw film for the PVA polarizing layer. A polyvinyl alcohol-based resin can be formed into a film by a known method. The thickness of the original fabric is usually 1 to 150 μm, and preferably 10 μm or more in consideration of ease of stretching.

For the PVA polarizing layer, for example, the raw film is uniaxially stretched, the film is dyed with a dichroic dye to adsorb the dichroic dye, the film is treated with an aqueous boric acid solution, and , the film is washed with water and finally dried. The thickness of the PVA polarizing layer may be 20 μm or less, 15 μm or less, 10 μm or less, or usually 3 μm or more, or 5 μm or more.

The PVA polarizing layer is prepared by [i] using a single film of a polyvinyl alcohol resin film as the original film, and subjecting this film to uniaxial stretching treatment and dichroic dyeing treatment, and [ii] base material After coating a film with a coating solution (aqueous solution, etc.) containing a polyvinyl alcohol resin and drying to obtain a base film having a polyvinyl alcohol resin layer, the base film is uniaxially stretched together with the base film, and after stretching, It can also be obtained by a method of subjecting the polyvinyl alcohol-based resin layer of (1) to dyeing treatment with a dichroic dye, and then peeling and removing the substrate film. Examples of the base film include films formed using the resin materials described for the first base layer, the second base layer, and the third base layer.

As the polymerizable liquid crystal compound used for forming the liquid crystal polarizing layer, a polymerizable liquid crystal compound having a polymerizable reactive group exemplified in the first composition and the second composition can be used. [iii] For example, a polarizing layer-forming composition containing a polymerizable liquid crystal compound and a dichroic dye is applied onto an alignment layer formed on a base film, and the polymerizable liquid crystal compound is polymerized. [iv] The polarizing layer-forming composition is applied onto the substrate film to form a coating film, and the coating film is stretched together with the substrate film. Examples of the base film include the base film used in [ii] above. The thickness of the liquid crystal polarizing layer may be 20 μm or less, 15 μm or less, 13 μm or less, 10 μm or less, or 5 μm or less. However, it is usually 0.1 μm or more, and may be 0.3 μm or more.

(adhesive layer)
The adhesive layer is a layer obtained by curing an adhesive composition. The adhesive composition contains a curable resin component as a curable component, and is an adhesive other than the pressure-sensitive adhesive (adhesive) described below. Examples of the adhesive composition include a water-based adhesive obtained by dissolving or dispersing a curable resin component in water, an active energy ray-curable adhesive containing an active energy ray-curable compound, a thermosetting adhesive, and the like. .

Polyvinyl alcohol-based resins, urethane-based resins, and the like can be used as resin components contained in water-based adhesives.

Active energy ray-curable adhesives include compositions that are cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays. Among these, it is preferably an ultraviolet curable resin composition that is cured by irradiation with ultraviolet rays. The active energy ray-curable adhesive preferably contains an epoxy compound as a curable component, and more preferably contains an alicyclic epoxy compound. The active energy ray-curable adhesive may contain a (meth)acrylic compound or the like together with the epoxy compound.

Examples of thermosetting adhesives include those containing epoxy-based resins, silicone-based resins, phenol-based resins, melamine-based resins, etc. as main components. In addition to the curable component, the adhesive composition contains a solvent, a sensitizer, a polymerization accelerator, an ion trapping agent, an antioxidant, a chain transfer agent, a tackifier, a thermoplastic resin, a filler, a flow control agent, a plasticizer. Additives such as agents, antifoaming agents, antistatic agents, and leveling agents may also be included.

(First bonding layer, second bonding layer, third bonding layer)
The first bonding layer, the second bonding layer, and the third bonding layer are adhesive layers obtained by curing an adhesive composition, or pressure-sensitive adhesive layers formed using a pressure-sensitive adhesive composition. As the adhesive composition, those described above can be used.

The adhesive composition contains an adhesive. A pressure-sensitive adhesive exhibits adhesiveness when it is attached to an adherend, and is a so-called pressure-sensitive adhesive. Examples of adhesives include those containing polymers such as (meth)acrylic polymers, silicone polymers, polyester polymers, polyurethane polymers, polyether polymers, and rubber polymers as main components. As used herein, the term "main component" refers to a component that accounts for 50% by mass or more of the total solid content of the adhesive. The pressure-sensitive adhesive may be of an active energy ray-curable type or a thermosetting type, and the degree of cross-linking and adhesive strength may be adjusted by irradiation with an active energy ray or heating.

EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.

[Detection of fluorine atomic weight]
The fluorine atomic weight was calculated by X-ray photoelectron spectroscopic analysis using an X-ray photoelectron spectrometer (manufactured by Thermo Scientific, K-Alpha) in the following procedure.

First, a wide scan spectrum was obtained at a measurement spot on the adhesive layer side surface of the first retardation layer, and narrow scan spectra were obtained for all the elements detected in the wide scan spectrum. Next, the peak areas of the narrow scan spectra of all the elements were determined, the elemental composition ratio [atom %] at each measurement spot was calculated, and the elemental amount of fluorine atoms at the measurement spot was calculated. The measurement spots are positioned 50 μm and 100 μm in the direction (width direction, winding axis direction) intersecting the edge of the cured material layer constituting the first retardation layer subjected to the flame treatment. , 200 μm, 500 μm, 700 μm, and 1000 μm.

Measurement conditions are as follows.
(Measurement condition)
・X-ray source: Al-Kα monochrome (1486.7 eV)
・X-ray spot size (measurement spot diameter): 400 μm
Wide scan analysis (Survey scan);
Measurement range: -10 to 1350 eV, pass energy: 200 eV,
Dwell time: 25 msec, step: 1.0 eV, number of integrations: 5 times, narrow scan analysis (Snap scan);
Pass energy: 150 eV, Acquisition time: 1 second, Accumulation times: 10 times

[Production Example 1: Production of Laminate (1) Having First Retardation Layer Formed on First Base Layer]
(Preparation of composition for forming alignment layer)
A 2% by mass aqueous solution of polyvinyl alcohol (polyvinyl alcohol 1000 fully saponified type, manufactured by Wako Pure Chemical Industries, Ltd.) was used as a composition for forming an alignment layer.

(Preparation of first composition)
2.0 parts of a leveling agent (F-556; manufactured by DIC) to a mixture obtained by mixing the following polymerizable liquid crystal compound A and polymerizable liquid crystal compound B at a mass ratio of 90:10, and polymerization initiation 6 parts of 2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)butan-1-one (“Irgacure 369 (Irg369)”, manufactured by BASF Japan Ltd.) was added as an agent. Furthermore, N-methyl-2-pyrrolidone (NMP) was added so that the solid content concentration was 13%, and the mixture was stirred at 80° C. for 1 hour to obtain a first composition.

＜重合性液晶化合物Ｂ＞

Polymerizable liquid crystal compound A was produced by the method described in JP-A-2010-31223. Polymerizable liquid crystal compound B was produced according to the method described in JP-A-2009-173893. Each molecular structure is shown below.
<Polymerizable liquid crystal compound A>

<Polymerizable liquid crystal compound B>

(Production of laminate (1))
As the first substrate layer, a long cycloolefin film [trade name “ZF-14-50” manufactured by Nippon Zeon Co., Ltd.] with a thickness of 50 μm and a width of 1100 mm was subjected to corona treatment, and then an orientation layer was formed. Using a die coater, apply the composition for coating so that the coating width is 1000 mm (50 mm each from both ends in the width direction of the first base material layer is an uncoated area), and then at 60 ° C. for 1 minute and then at 80 ° C. and dried for 3 minutes to form a film with a thickness of 89 nm. Subsequently, the surface of the obtained film was subjected to rubbing treatment to form an alignment layer. Rubbing treatment is performed using a semi-automatic rubbing device (trade name: LQ-008 type, manufactured by Joyo Engineering Co., Ltd.) with a cloth (trade name: YA-20-RW, manufactured by Yoshikawa Kako Co., Ltd.) with a pushing amount of 0.15 mm. , 500 rpm and 16.7 mm/s.

Next, the first composition was applied to the entire surface of the alignment layer using a die coater and dried at 120° C. for 1 minute. Then, using a high-pressure mercury lamp (trade name of Ushio Inc.: “Unicure VB-15201BY-A”), ultraviolet rays were irradiated (in a nitrogen atmosphere, integrated light intensity at a wavelength of 365 nm: 500 mJ/cm ² ). A cured product layer of a polymerizable liquid crystal compound was formed on the alignment layer provided on the first substrate layer. Subsequently, both ends were slit so that each had a width of 45 mm, and a raw fabric laminate (1) having a width of 1010 mm was obtained. A sheet piece (width 1010 mm, length 100 mm) is cut out from the obtained raw fabric laminate (1), and two positions of 100 μm and 1000 μm from the end of the cured material layer of the polymerizable liquid crystal compound of the sheet piece are selected. , the fluorine atomic weight was measured by the method described above for a total of four measurement spots, and the average value at each position was obtained. Table 1 shows the results.

The raw fabric laminate (1) obtained above was wound into a roll to obtain a raw fabric roll (1). Frame treatment (heat treatment) was applied to both ends of the original roll (1) in the direction of the winding axis to obtain a roll (1) of the laminate (1). The flame treatment was carried out by using a burner (gas pressure: 0.4 MPa) and moving the burner along the end faces at both ends in the winding axial direction of the fixed raw fabric roll (1). In the flame treatment, the moving speed of the burner is 700 mm / sec, the distance between the burner and the cured material layer located at the end of the winding axial direction of the raw fabric roll (1) is 20 mm, and the raw roll is The condition of (1) was such that the burner was reciprocated once along the end face in the direction of the winding axis (this is referred to as 2 passes).

Two positions of 50 μm, 100 μm, 200 μm, 500 μm, 700 μm, and 1000 μm from the flame-treated end of the surface of the first retardation layer of the laminate (1) unwound from the wound body (1). The fluorine atomic weight was measured by the method described above for a total of 12 measurement spots, and the average value at each position was calculated. Also, the difference between the average fluorine atomic weight obtained for each measurement spot and the average fluorine atomic weight at a position 1000 μm from the edge was calculated. Table 2 shows the results.

[Production Example 2: Preparation of adhesive composition]
3′,4′-Epoxycyclohexylmethyl 3,4-epoxycyclohexane carboxylate [trade name “Celoxide 2021P” manufactured by Daicel Corporation] is added to 75 parts by mass of 1,4-butanediol diglycidyl ether [Nagase ChemteX Co., Ltd. trade name “EX-214L”] 25 parts by mass, and a photopolymerization initiator [San-Apro Co., Ltd. trade name “CPI-100P”] 5.0 parts by mass are added and mixed, An adhesive composition was prepared.

[Example 1]
Two laminates (1) (width 1010 mm, length 100 m) were prepared, and the adhesive composition prepared in Production Example 2 was applied to the surface of the first retardation layer of one laminate (1). After lamination with the surface side of the first retardation layer of one laminate (1), the adhesive layer is irradiated with ultraviolet rays (accumulated light amount 400 mJ/cm ² (UV-B)) to cure the adhesive composition. was formed to obtain an optical laminate (1). The obtained optical layered body (1) was wound around a core to obtain a wound body (1) of the optical layered body (1).

After the wound body (1) was stored at a temperature of 23° C. for 3 days, the surface of the wound body (1) was visually inspected to find no unevenness.

[Comparative Example 1]
An optical laminate (2) was obtained in the same manner as in Example 1 except that two original fabric laminates (1) (width 1010 mm, length 100 m) were used instead of the laminate (1), A wound body (2) of the optical laminate (2) was obtained. After the wound body (2) was stored at a temperature of 23° C. for 3 days, the surface of the wound body (2) was visually checked to confirm unevenness.

1 to 5 optical laminate 10 first retardation layer 11a, 11b first region 12a, 12b second region 15 through hole 18 first substrate layer 20 adhesive layer 21 first bonding layer , 23 third bonding layer, 30 optical layer, 31 second substrate layer, 32 second retardation layer (optical layer), 33 third retardation layer, 34 third substrate layer, 35 polarizing plate (optical layer ), Sa, Sb ends.

Claims (10)

An optical laminate in which a first retardation layer containing a cured product layer of a polymerizable liquid crystal compound, an adhesive layer, and an optical layer are laminated in this order,
The first retardation layer has a first region including an end portion of the first retardation layer and a second region adjacent to the first region in plan view,
The end, the first region, and the second region are arranged in this order along a crossing direction that intersects the end in a plan view of the first retardation layer,
The optical laminate, wherein the fluorine content in the first region is lower than the fluorine content in the second region on the surface of the first retardation layer facing the adhesive layer. The first region includes a region between the end and a position 100 μm from the end in the cross direction,
The second region includes a region between a boundary position between the first region and the second region and a position 1000 μm from the end in the crossing direction,
On the adhesive layer side surface of the first retardation layer, the fluorine content F1 [atm%] at a point 100 μm from the end, and the fluorine content F2 [atm%] at a point 1000 μm from the end The optical laminate according to claim 1, which satisfies the relationship of the following formula (A).
F1 [atm%] ≤ F2 [atm%] - 2.5 [atm%] (A) 3. The optical laminate according to claim 1, wherein the first retardation layer has a thickness of 0.5 [mu]m or more and 10 [mu]m or less. The planar view shape of the first retardation layer is a rectangle,
The optical layered body according to any one of claims 1 to 3, wherein the edge is an edge on the periphery of the rectangle. The first retardation layer has a through hole penetrating in the lamination direction of the optical laminate,
The optical layered body according to any one of claims 1 to 4, wherein the end portion is an end portion located on the periphery of the through-hole. The optical laminate according to any one of claims 1 to 5, wherein the optical layer is a second retardation layer containing a cured product layer of a polymerizable liquid crystal compound. further comprising a linear polarizer,
7. The optical laminate according to claim 6, wherein the linear polarizer is laminated on a side of the first retardation layer or the optical layer opposite to the adhesive layer side. The optical laminate according to any one of claims 1 to 5, wherein the optical layer comprises a linear polarizer. Furthermore, including a third retardation layer containing a cured product layer of a polymerizable liquid crystal compound,
9. The optical laminate according to claim 8, wherein the third retardation layer is laminated on the side of the first retardation layer opposite to the adhesive layer side. A wound body obtained by winding the optical layered body according to any one of claims 1 to 9 into a roll.

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