JP6995234B1 - Optical laminate and its winding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical laminate in which deformation is suppressed and a wound body thereof. SOLUTION: In an optical laminate, a first retardation layer including 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 a plan view. The end portion, the first region, and the second region are arranged in this order along the crossing direction intersecting the end portion in the plan view of the first retardation layer. On the surface of the first retardation layer on the adhesive layer side, the fluorine content in the first region is smaller than the fluorine content in the second region. [Selection diagram] Fig. 2

Description

The present invention relates to an optical laminate and a wound body thereof.

A member including an optical film such as a polarizing plate and a retardation plate is used in a display device such as a liquid crystal display device or an organic EL display device. As a member containing such an optical film, a liquid crystal composition containing a polymerizable liquid crystal compound is applied on a base material layer, and then the polymerizable liquid crystal compound is polymerized and cured to form a retardation layer, and the retardation layer is formed. An optical laminate in which a polarizing element is laminated on top of an adhesive layer is known (for example, Patent Document 1 and the like).

Japanese Patent Application Laid-Open No. 2015-191142

The optical laminate is usually manufactured as a long product, and is marketed, stored, or the like in a state where the long optical laminate is wound in a roll shape. In the wound body in which the optical laminated body is wound in a roll shape, the entire surface is not smooth near the end portion in the winding axis direction of the wound body, and unevenness occurs especially in the thin-film optical laminated body. It was found that there may be cases. Since the entire film surface of the optical laminate unwound from the wound body whose surface is deformed may not be flat along the horizontal plane and may be deformed, the optical laminate may be processed or displayed. Not suitable for application to devices, etc.

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

The present invention provides the following optical laminates.
[1] An optical laminate in which a first retardation layer including 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 a plan view.
The end portion, the first region, and the second region are arranged in this order along the crossing direction intersecting the end portion in the plan view of the first retardation layer.
An optical laminate in which the fluorine content of the first region is smaller than the fluorine content of the second region on the surface of the first retardation layer on the adhesive layer side.
[2] The first region includes a region between the end portion and a position 100 μm from the end portion in the crossing direction.
The second region includes a region between the boundary position between the first region and the second region and a position 1000 μm from the end portion in the crossing direction.
On the surface of the first retardation layer on the adhesive layer side, 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. Is 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 thickness of the first retardation layer is 0.5 μm or more and 10 μm or less.
[4] The plan view shape of the first retardation layer is rectangular.
The optical laminate according to any one of [1] to [3], wherein the end portion is an end portion on the peripheral edge of the rectangle.
[5] The first retardation layer has a through hole penetrating in the stacking direction of the optical laminate.
The optical laminate according to any one of [1] to [4], wherein the end portion is an end portion on the peripheral edge 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 including a cured product layer of a polymerizable liquid crystal compound.
[7] Further, a linear deflector is included.
The optical laminate according to [6], wherein the linear splitter is laminated on the side opposite to the adhesive layer side of the first retardation layer or the optical layer.
[8] The optical laminate according to any one of [1] to [5], wherein the optical layer contains a linear polarizing element.
[9] Further, a third retardation layer including a cured product layer of the polymerizable liquid crystal compound is included.
The optical laminate according to [8], wherein the third retardation layer is laminated on the side opposite to the adhesive layer side of the first retardation layer.
[10] A wound body obtained by winding the optical laminate according to any one of [1] to [9] in a roll shape.

According to the present invention, it is possible to suppress deformation of an optical laminate having a retardation layer including a cured product layer of a polymerizable liquid crystal compound.

It is sectional drawing which shows typically the optical laminated body which concerns on one Embodiment of this invention. It is a top view schematically showing an example of the 1st retardation layer side of the optical laminated body shown in FIG. 1. It is a top view schematically showing another example of the 1st retardation layer side of the optical laminated body shown in FIG. 1. It is a top view schematically showing still another example of the 1st retardation layer side of the optical laminated body shown in FIG. 1. It is sectional drawing which shows typically the optical laminated body which concerns on other embodiment of this invention. It is sectional drawing which shows typically the optical laminated body which concerns on still another Embodiment of this invention. It is sectional drawing which shows typically the optical laminated body which concerns on still another Embodiment of this invention. It is sectional drawing which shows typically the optical laminated body which concerns on still another Embodiment of this invention.

Hereinafter, embodiments of the optical laminate of the present invention will be described with reference to the drawings. Each of the following embodiments may be combined arbitrarily. In each embodiment and each drawing, the same or corresponding member as the member described above may be designated by the same or corresponding reference numeral, and the description thereof may not be repeated. Further, each drawing is shown by adjusting the scale appropriately in order to make each component easy to understand, 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 the present embodiment. 2 and 3 are plan views schematically showing the first retardation layer side of the optical laminate shown in FIG. 1.

As shown in FIG. 1, the optical laminate 1 has 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 the 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 the 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 laminate 1 is not particularly limited, and is, for example, a rectangle, a square, or a shape other than a rectangle and a square. Other shapes include, for example, polygons, circles, and ellipses. The optical laminate 1 may have a rectangular shape, a square shape, or a deformed shape having a concave portion formed on the outer peripheral edge of another shape, or the rectangular, square, or polygonal corners may have rounded corners (R). It may have a rounded corner shape, or it may have a through hole as described later. The optical laminate 1 may be a single-wafered body or a long film-like material. When the optical laminate 1 is a long film-like material, the optical laminate 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 laminate 1 has a first region 11a including an end Sa and a second region 12a adjacent to the first region 11a in a plan view. Has. The end Sa, the first region 11a, and the second region 12a are arranged in this order along the first crossing direction X1 (crossing direction) intersecting the end Sa in the plan view of the first retardation layer 10. There is. The end Sa is, for example, an end on the outer peripheral edge of the first retardation layer 10, and is rectangular when the plan view shape of the first retardation layer 10 is rectangular as shown in FIGS. 2 and 3. It can be an edge on the periphery. As shown in FIGS. 2 and 3, the end portion Sa may include the entire one side of the first retardation layer 10, or may be a part of one side. The first crossing direction X1 is not particularly limited as long as it intersects the end Sa, and may be a direction orthogonal to the end Sa as shown in FIGS. 2 and 3.

On the surface of the optical laminate 1 on the adhesive layer 20 side of the first retardation layer 10, the fluorine content of the first region 11a is smaller than the fluorine content of the second region 12a. In the present specification, the fluorine content means the content of a fluorine atom. The content of fluorine atoms on the surface of the first retardation layer 10 on the adhesive layer 20 side can be measured by the method described in Examples described later. The fluorine atom present in the first retardation layer 10 is contained in the material for forming the first retardation layer 10, and is, for example, a fluorine atom contained in a 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 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 larger 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, in the region near the end Sa having the fluorine content as described above, the adhesive composition tends to stay in the region due to the cissing and surface tension of the adhesive composition applied or spread in the region. it is conceivable that. When the adhesive composition stays in the region near the end Sa, the thickness of the adhesive layer formed between the first retardation layer and the optical layer becomes non-uniform. When an optical laminate having such an adhesive layer having a non-uniform thickness is wound in a roll shape, the entire surface of the wound body is not smoothed, and unevenness is likely to occur especially in a region near the end Sa. , The optical laminate unwound from the winding body may be deformed.

On the other hand, in the optical laminate 1 of the present embodiment, as described above, on the surface of the first retardation layer 10 on the adhesive layer side, the first region including the end Sa of the first retardation layer 10 is included. The fluorine content of 11a is smaller 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 the production of the optical laminate 1, it is possible to prevent the adhesive composition from staying in the first region 11a. 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 laminate 1 in a roll shape has irregularities. It is less likely to occur and the entire surface tends to be smooth. Therefore, it is possible to suppress the deformation of the optical laminated body 1 unwound from the wound body.

The fluorine content of the surface of the first retardation layer 10 of the optical laminate 1 on the adhesive layer 20 side usually increases from the end Sa included in the first region 11a toward the first crossing direction X1. This increase in fluorine content may be continuous or gradual.

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 adhesive layer 20 side is adjacent to the first crossing 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 the end Sa of the first retardation layer 10 and the position P1a 100 μm away from the end Sa in the first crossing direction X1. You may be. For example, the first region 11a may be a region from the end Sa to the position P1a, or as shown in FIGS. 2 and 3, the first crossing direction X1 from the end Sa so as to include the position P1a. May include a range exceeding 100 μm.

Two or more first regions 11a may be provided in the first retardation layer 10. For example, when the first phase difference layer 10 is rectangular, as shown in FIG. 3, the first region 11a includes the end portions Sa and Sa'of a pair of opposite sides, respectively, so that the first phase difference Two may be provided in the layer 10. When the first retardation layer 10 has two or more first regions 11a, the fluorine contents of each of the first regions 11a may be the same as each other or may be different from each other.

The second region 12a is a region adjacent to the first region 11a in the first crossing 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 the position P2a 1000 μm in the first crossing direction X1 from the end Sa. May include. For example, the second region 12a may be a region from the boundary position to the position P2a, or as shown in FIGS. 2 and 3, the first crossing direction X1 from the end Sa so as to include the position P2a. May include a range exceeding 1000 μm. The boundary position between the first region 11a and the second region 12a may be the position of the position P1a, or is located at a position exceeding 100 μm (a position exceeding the position P1a) in the first crossing direction X1 from the end Sa. May be good. The second region 12a may include the position P2a.

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

The first region 11a includes the region between the end Sa and the position P1a, and the second region 12a includes the boundary position between the first region 11a and the second region 12a and the region between the positions P2a. In the case, the fluorine content F1 [atm%] at the position P1a and the fluorine content F2 [atm%] at the position P2a on the surface of the first retardation layer 10 on the adhesive layer 20 side 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 retention of the adhesive composition in the first region 11a of the first retardation layer 10. Therefore, since it is possible to make it difficult for unevenness to occur on the surface of the wound body of the optical laminated body 1, it is possible to suppress deformation of the optical laminated body 1 unwound from the wound body.

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 surface of the first retardation layer 10 on the adhesive layer 20 side, the fluorine content between the positions 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 preferable. For example, the fluorine content F500 at a position 500 μm from the end Sa may be F2-0.3 or higher, F2-0.5 or higher, or F2-0.7 or higher. 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 by, for example, the following method. First, an original anti-phase difference layer containing a fluorine atom is prepared. For the original anti-phase difference layer, for example, a composition in which a polymerizable liquid crystal compound and a material containing a fluorine atom are mixed is applied to a first base material layer to form a coating layer, and the polymerizable liquid crystal compound in the coating layer is formed. It can be obtained by polymerization curing. The coating layer may be formed on the alignment layer formed on the first base material layer. Examples of the material containing a fluorine atom include a leveling agent and the like. The end portion of the raw fabric laminated body of the first base material layer obtained as described above and the raw fabric retardation layer is heat-treated. As a result, the fluorine content of the first region 11a including the end 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 end portion of the raw fabric laminate is not particularly limited as long as it is a treatment capable of reducing the fluorine content of the first retardation layer 10, but for example, the end portion of the raw fabric laminate is flamed. Examples thereof include a roasting frame treatment or an itro treatment, and a heat ray treatment in which the raw fabric laminate is roasted with heat rays. Burning with a flame or a heat ray may be performed by quickly stroking the end face of the raw fabric laminated body with the heat of the flame or the heat ray. The heat treatment may be performed on the end face of one raw fabric laminated body, but if it is a long raw fabric laminated body, the heat treatment may be performed on the end face of the raw fabric roll in which the raw fabric laminated body is wound in a roll shape. It may be carried out, or if it is a sheet-fed raw fabric laminated body, it may be carried out on the end face of a laminated structure in which a plurality of raw material laminated bodies (for example, 10 to 50 sheets) are stacked.

The optical laminate 1 can be manufactured, 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, the optical layer 30 side, or 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 first retardation layer 10 are laminated. The adhesive composition is spread with and from the optical layer 30. Examples of the coating method of the adhesive composition include known coating methods used in the optical field, specifically, a spin coating method, an extrusion method, a gravure coating method, a die coating method, a slit coating method, and a bar. Examples include a coating method, a comma coating method, an applicator method, and a flexographic method. The adhesive layer 20 can be formed by laminating the first retardation layer 10 and the optical layer 30 via the adhesive composition and then curing the adhesive layer 20. After forming the adhesive layer 20, the first base material layer may be peeled off.

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

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

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

The shape, size, number, and the like of the through holes 15 included in the first retardation layer 10 are not particularly limited as long as they penetrate in the stacking direction of the optical laminate 1. The shape of the through hole 15 is, for example, a circle (perfect circle); an ellipse; an oval shape; a polygon such as a triangle or a quadrangle; at least one corner of the polygon is a rounded corner (a shape having an R). It can be a polygon or the like. FIG. 4 shows a case where the through hole 15 is circular (perfect 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, may be 15 mm or less, may be 10 mm or less, or may be 7 mm or less. In the present specification, the diameter of the through hole 15 means the diameter of the circle when the plan view shape of the through hole is circular (perfect circle), and the diameter of the through hole is other than the circular shape (perfect circle). In the case, it means the diameter of the circumscribing circle (perfect circle) of the through hole in a plan view.

The first retardation layer 10 may have one through hole 15 or two or more through holes 15. When having two or more through holes 15, the shapes and sizes may be the same or different.

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

Also in the first retardation layer 10 shown in FIG. 4, the first region 11a including the end Sa on 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), the fluorine content of the first region 11b including the end Sb on the surface of the first retardation layer 10 of the optical laminate 1 on the adhesive layer 20 side is the second region 12b. Less than the fluorine content of.

The fluorine content of the surface of the first retardation layer 10 of the optical laminate 1 on the adhesive layer 20 side is usually increased from the end portion Sb contained in the first region 11b along the second crossing direction X2. This increase in fluorine content may be continuous or gradual.

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

The second region 12b is a region adjacent to the first region 11b in the second crossing 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 the position P2b 1000 μm from the end Sb in the second crossing direction X2. You may. For example, the second region 12b may be a region from the boundary position to the position P2b, or exceeds 1000 μm in the first crossing direction X1 from the end Sb so as to include the position P2b as shown in FIG. It may include a range. The boundary position between the first region 11b and the second region 12b may be the position of the position P1b, or is located at a position exceeding 100 μm (a position exceeding the position P1b) in the second crossing direction X2 from the end Sb. May be good. Two or more of the second regions 12b may be provided in the first retardation layer 10, and the fluorine contents of each of the second regions 12b may be the same as or different from each other.

If the first region 11b includes the region between the end Sb and the position P1b and the second region 12b includes the region between the boundary position and the end Sb to the position P2b, the first phase difference. On the surface of the layer 10 on the adhesive layer 20 side, 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 preferable. The preferred ranges of F1, F50, and F500 are as described above.

As described above, even when the first region 11b and the second region 12b are provided on the first retardation layer 10, unevenness is generated on the surface of the wound body in which the optical laminated body 1 is wound in a roll shape. It is considered that the smoothness of the entire surface can be improved by suppressing the above. Thereby, it can be expected that the deformation of the optical laminated body 1 unwound from the wound body 1 is suppressed.

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 above embodiment.

Hereinafter, a specific layer structure of the optical laminate will be described.
(Example of optical laminate (1))
5 and 6 are cross-sectional views schematically showing an optical laminate according to the present embodiment. In the optical laminates 2 and 3 shown in FIGS. 5 and 6, the optical layer 30 in the optical laminate 1 shown in FIG. 1 is the second retardation layer 32.

As shown in FIGS. 5 and 6, the optical laminates 2 and 3 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 contain a cured product layer of a polymerizable liquid crystal compound. When the second retardation layer 32 includes the cured product layer, the second retardation layer 32 may further include an alignment layer for orienting the polymerizable liquid crystal compound. The optical laminates 2 and 3 or the first retardation layer 10 may have through holes penetrating the optical laminates 2 and 3 in the stacking direction.

As shown in FIG. 5, the optical laminate 2 has a first laminated layer 21 and a polarizing plate 35 including a linear polarizing element on the opposite side of the first retardation layer 10 from the adhesive layer 20 side. 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 laminated layer and a polarizing plate containing a linear polarizing element 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 base material layer may be laminated on the side opposite to the adhesive layer 20 side of the first retardation layer 10. The polarizing plate 35 has a protective layer on one side or both sides of the linear polarizing element, and the linear polarizing element and the protective layer may be laminated via an adhesive composition or an adhesive composition, or the linear polarizing element may be laminated. A protective layer may be directly laminated on the protective layer. The second bonding layer is an adhesive layer that is a cured product of the adhesive composition, or an adhesive layer formed from the adhesive composition.

As shown in FIG. 6, the optical laminate 3 may have the first base material layer 18 on the side opposite to the adhesive layer 20 side of the first retardation layer 10. Further, as shown in FIG. 6, the optical laminate 3 may further have a second base material layer 31 on the side opposite to the adhesive layer 20 side of the second retardation layer 32.

When the second retardation layer 32 includes a cured product layer of a polymerizable liquid crystal compound, the second retardation layer 32 may have a region having a different fluorine content on the surface on the adhesive layer 20 side. Specifically, the second retardation layer 32 has a first'region including an end portion of the second retardation layer 32 and a second'region adjacent to the first'region in a plan view. In the plan view of the second retardation layer 32, when the end portion, the first'region, and the second'region are arranged in this order along the crossing direction intersecting the end portion, the first'region The fluorine content of the second region may be smaller than the fluorine content of the second region. The end portion of the second retardation layer 32 may be an end portion on the outer peripheral edge of the second retardation layer 32, or an end portion of the second retardation layer 32 on the peripheral edge of the through hole. May be good.

Regarding the end portion, the first'region, and the second'region, the end portions Sa, Sa', Sb, the first regions 11a, 11b, and the second regions 12a, 12b of the first retardation layer 10, respectively, will be described. It can be configured as you did. For example, the 1'region can include an end portion included in the 1st'region of the second retardation layer 32 and a region between the end portion and a position P1'100 μm in the crossing direction. The second'region is between the boundary position between the first'region and the second'region of the second retardation layer 32 and the position P2' 1000 μm in the crossing direction from the end included in the first'region. Can include areas of.

On the surface of the second retardation layer 32 on the adhesive layer 20 side, the fluorine content F1 [atm%] at the position P1'and the fluorine content F2 [atm%] at the position P2'are the above-mentioned formulas (A). ) Satisfying the relationship. The preferred ranges of 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. The C layer can be 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 circular polarizing plate.

The optical laminate 3 shown in FIG. 6 includes, for example, a first laminate in which the first retardation layer 10 is formed on the first substrate layer 18, and a second retardation layer 32 on the second substrate layer 31. Can be manufactured by laminating the second laminated body on which the above is formed via the adhesive layer 20. The adhesive composition for forming the adhesive layer 20 may be applied to the first retardation layer 10 side of the first laminated body, or may be applied to the second retardation layer 32 side of the second laminated body. It may be applied to both of them. Examples of the method for applying the adhesive composition include the above-mentioned methods. The adhesive layer can be formed by laminating the first laminated body and the second laminated body via the adhesive composition and then curing the adhesive layer.

In the optical laminate 2 shown in FIG. 5, for example, the first substrate layer 18 is peeled off from the optical laminate 3 shown in FIG. 6, and the exposed first retardation layer 10 is placed on the exposed first retardation layer 10 via the first bonding layer 21. It can be manufactured by laminating the polarizing plate 35.

(Example of optical laminate (2))
7 and 8 are cross-sectional views schematically showing an optical laminate according to the present embodiment. In the optical laminates 4 and 5 shown in FIGS. 7 and 8, the optical layer 30 in the optical laminate 1 shown in FIG. 1 is a polarizing plate 35 including a linear polarizing element. As shown in FIGS. 7 and 8, the optical laminates 4 and 5 include a first retardation layer 10, an adhesive layer 20, and a polarizing plate 35 (optical layer 30). The optical laminates 4, 5 or the first retardation layer 10 may have through holes penetrating the optical laminates 4, 5 in the stacking direction.

As shown in FIG. 7, the optical laminate 4 may have the first base material layer 18 on the side opposite to the adhesive layer 20 of the first retardation layer 10.

As shown in FIG. 8, in the optical laminate 5, the third bonded layer 23 and the third retardation layer 33 are laminated in this order on the side opposite to the adhesive layer 20 side of the first retardation layer 10. You may. A third base material layer 34 may be laminated on the side of the third retardation layer 33 opposite to the third bonded layer 23.

The third retardation layer 33 may be a stretched film or may include a cured product layer of a polymerizable liquid crystal compound. When the third retardation layer 33 contains a cured product layer of a polymerizable liquid crystal compound, the surface on the third bonded layer 23 side has a region having a different fluorine content as described for the second retardation layer 32. You may be doing it. The third bonding layer 23 is an adhesive layer or an adhesive layer which is a cured product of the 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 circular 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. Can be 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 circular polarizing plate.

In the optical laminate 4 shown in FIG. 7, for example, the first laminate in which the first retardation layer 10 is formed on the first substrate layer 18 and the polarizing plate 35 containing a linear polarizing element are bonded to each other as an adhesive layer. It can be manufactured by laminating through 20. The adhesive composition for forming the adhesive layer may be applied to the first retardation layer 10 side of the first laminated body, the polarizing plate 35 side, or both of them. It may be applied. Examples of the method for applying the adhesive composition include the above-mentioned methods. The adhesive layer can be formed by laminating the first laminated body and the polarizing plate via the adhesive composition and then curing the adhesive layer.

In the optical laminate 5 shown in FIG. 8, for example, the first substrate layer 18 is peeled off from the optical laminate 4 shown in FIG. 7, and the exposed first retardation layer 10 is placed on the exposed first retardation layer 10 via the third bonding layer 23. , It can be manufactured by laminating a third laminated body having a third retardation layer 33 formed on the third base material 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 laminates 1 to 5 may be 10 μm or more, or may be 50 μm or more. An optical laminate having a thickness of 200 μm or less and having the fluorine content on the surface of the first retardation layer on the adhesive layer side not adjusted as in the optical laminates 1 to 5 is wound into a roll. When turned, the optical laminate 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 can be obtained. It becomes easy to suppress the deformation that occurs.

Hereinafter, the materials and the like used in the optical laminates 1 to 5 described above will be specifically described.
(First retardation layer)
The first retardation layer is not particularly limited as long as it includes a cured product layer of the polymerizable liquid crystal compound. The first retardation layer may include an alignment layer for orienting the polymerizable liquid crystal compound in addition to the cured product layer. The first retardation layer contains a fluorine atom.

The thickness of the first retardation layer is not particularly limited, but may be 10 μm or less, 8 μm or less, 5 μm or less, or 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 is made smaller than the fluorine content of the second region on the surface of the first retardation layer on the adhesive layer side. This makes it possible to effectively suppress the deformation of the optical laminate.

The first retardation layer can be formed by using a first composition containing a polymerizable liquid crystal compound, and the first composition is a leveling agent containing a fluorine atom (hereinafter referred to as “leveling agent (F)”). May be included.). The leveling agent (F) includes "Megafuck (registered trademark) R-08", "R-30", "R-90", "F-410", "F-411", and "F-411". "F-443", "F-445", "F-470", "F-471", "F-477", "F-479", "F-482", "F" -483 "and" F-556 "(DIC Co., Ltd.);" 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.); "E1830", "E5844" (Daikin Fine Chemical Laboratory Co., Ltd.) ); "Ftop EF301", "Ftop EF303", "Ftop EF351", "Ftop EF352" (Mitsubishi Materials Electronics Chemical Co., Ltd.) and the like can be mentioned.

The polymerizable liquid crystal compound is a compound having a polymerizable reactive group and exhibiting liquid crystallinity. The polymerizable reactive group is a group involved in the polymerization reaction, and is preferably a photopolymerizable reactive group. The photopolymerizable reactive group refers to a group that can participate in the polymerization reaction by an active radical, an acid, or the like generated from the photopolymerization initiator. Examples of the photopolymerizable functional group include a vinyl group, a vinyloxy group, a 1-chlorovinyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxylanyl group, an oxetanyl group and the like. Of these, an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxylanyl group and an oxetanyl group are preferable, and an acryloyloxy group is more preferable. The type of the polymerizable liquid crystal compound is not particularly limited, and a rod-shaped liquid crystal compound, a disk-shaped liquid crystal compound, and a mixture thereof can be used. The liquid crystal property of the polymerizable liquid crystal compound may be a thermotropic liquid crystal or a lyotropic liquid crystal, and the phase-ordered structure may be a nematic liquid crystal or a smectic liquid crystal.

The leveling agent (F) contained in the first composition is preferably 0.01 part by mass or more, more preferably 0.05 part by mass or more, and more preferably 0.05 part by mass or more with respect to 100 parts by mass of the polymerizable liquid crystal compound. It is preferably 5 parts by mass or less, and 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 may be included in the first retardation layer has an orientation regulating force that orients the polymerizable liquid crystal compound in a desired direction. The alignment layer preferably has solvent resistance that does not dissolve when the first composition is applied, and has heat resistance in heat treatment for removing the solvent and aligning the polymerizable liquid crystal compound. Examples of the alignment layer include an alignment layer containing an orientation polymer, a photo-alignment layer, and a grub alignment layer in which an uneven pattern or a plurality of grooves are formed and oriented on the surface.

(2nd retardation layer, 3rd retardation layer)
The second retardation layer and the third retardation layer may be independently formed 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 the polymerizable liquid crystal compound, the second retardation layer and the third retardation layer include an alignment layer for orienting the polymerizable liquid crystal compound. The cured product layer may contain a fluorine atom.

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

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

When the second retardation layer and the third retardation layer include a cured product layer of the polymerizable liquid crystal compound, the cured product layer can be formed by using the second composition containing the polymerizable liquid crystal compound. As the polymerizable liquid crystal compound, the compound described in the first retardation layer can be used. The second composition may contain, in addition to the polymerizable liquid crystal compound, 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 the alignment layer, as the alignment layer, the alignment layer described in the alignment layer which may be included in the first retardation layer can be used.

(1st base material layer, 2nd base material layer, 3rd base material layer)
It is preferable that the first base material layer, the second base material layer, and the third base material layer are films independently formed of a resin material. As the resin material, for example, it is preferable to use a resin material having excellent transparency, mechanical strength, thermal stability and the like. The resin material is preferably a thermoplastic resin, for example, a cellulose resin such as triacetyl cellulose; a polyester resin such as polyethylene terephthalate and polyethylene naphthalate; a polyether sulfone resin; a polysulfone resin; a polycarbonate resin; Polyamide-based resins such as nylon and aromatic polyamides; polyimide-based resins; polyolefin-based resins such as polyethylene, polypropylene, and ethylene / propylene copolymers; cyclic polyolefin-based resins having cyclo- and norbornene structures; (meth) acrylic-based resins; Examples thereof include polyallylate-based resins; polystyrene-based resins; polyvinyl alcohol-based resins and the like. "(Meta) acrylic" means at least one selected from the group consisting of acrylic and methacrylic.

The first base material layer, the second base material layer, and the third base material layer may independently have a single-layer structure, may have a multi-layer structure, or may have a multi-layer structure. , Each layer may be formed of the same resin material or may be formed of a different resin material.

The thickness of the first base material layer, the second base material layer, and the third base material layer is preferably 5 to 300 μm independently from the viewpoint of strength and processability, and is preferably 10 to 200 μm. 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 bonded layer or the like.

The optical layer includes a linear polarizing element; a polarizing plate having a protective layer laminated on one side or both sides of the linear polarizing element; a polarizing plate with a protective film having a protective film laminated on one side of the polarizing plate; a reflective film; semi-transmissive reflection. Film; brightness improving film; optical compensation film; film with antiglare function; retardation film, retardation layer and the like can be mentioned.

(Polarizer)
The optical laminate may include a polarizing plate as an optical layer, or may include a polarizing plate separately from the optical layer. The polarizing plate is one in which a protective layer is laminated on one side or both sides of a linear polarizing element. When the polarizing plate has a protective layer laminated on only one side, 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 polarizing element in the optical laminate. preferable.

It is preferable that the linear polarizing element and the protective layer are bonded to each other via an adhesive layer or an adhesive layer. Examples of 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 the pressure-sensitive adhesive composition described later. Examples of the protective layer include a film formed of the resin material exemplified in the first base material layer, the second base material layer, and the third base material 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 deflector)
Examples of the linear polarizing element include a PVA polarizing layer in which a dichroic dye is adsorbed and oriented on a polyvinyl alcohol-based resin film, and a liquid crystal polarizing layer in which the dichroic dye is oriented in a cured layer of a polymerizable liquid crystal compound. Be done.

The polyvinyl alcohol-based resin constituting the polyvinyl alcohol-based resin film can be obtained by saponifying the polyvinyl acetate-based resin. Examples of the polyvinyl acetate-based resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, and a copolymer of a monomer copolymerizable with vinyl acetate and vinyl acetate. Examples of the monomer copolymerizable with vinyl acetate include unsaturated carboxylic acid, olefin, vinyl ether, unsaturated sulfonic acid, and (meth) acrylamide having an ammonium group.

The saponification degree of the polyvinyl alcohol-based resin is usually 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol-based resin may be modified, or for example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used. The saponification degree and the average degree of polymerization of the polyvinyl alcohol-based resin are usually 1000 to 10000, preferably 1500 to 5000. The average degree of polymerization of the polyvinyl alcohol-based resin can be determined in accordance with JIS K 6726.

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

The PVA polarizing layer is, for example, a step of uniaxially stretching the raw film, a step of dyeing the film with a dichroic dye and adsorbing the dichroic dye, a step of treating the film with a boric acid aqueous solution, and a step of treating the film with a boric acid aqueous solution. , The film is washed with water and finally dried to produce. The thickness of the PVA polarizing layer may be 20 μm or less, 15 μm or less, 10 μm or less, usually 3 μm or more, and 5 μm or more.

As the PVA polarizing layer, [i] a single film of a polyvinyl alcohol-based resin film is used as a raw film, and this film is subjected to a uniaxial stretching treatment and a bicolor dye dyeing treatment, as well as a [ii] base material. A coating liquid (aqueous solution, etc.) containing a polyvinyl alcohol-based resin is applied to the film and dried to obtain a base film having a polyvinyl alcohol-based resin layer, which is uniaxially stretched together with the base film, and after stretching. It can also be obtained by subjecting the polyvinyl alcohol-based resin layer of the above to a dyeing treatment of a bicolor dye and then peeling off the base film. Examples of the base film include films formed by using the resin materials described in the first base material layer, the second base material layer, and the third base material layer.

As the polymerizable liquid crystal compound used for forming the liquid crystal polarizing layer, the polymerizable liquid crystal compound having the polymerizable reactive group exemplified in the first composition and the second composition can be used. As the liquid crystal polarizing layer, [iii], for example, a composition for forming a polarizing layer 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. It can be formed by a method of curing, a method of applying a composition for forming a polarizing layer on a [iv] base film to form a coating film, and then stretching the coating film together with the base film. Examples of the base film include the base film used in the above [ii]. 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 the 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 later. Examples of the adhesive composition include a water-based adhesive in which a curable resin component is dissolved or dispersed in water, an active energy ray-curable adhesive containing an active energy ray-curable compound, a thermosetting adhesive, and the like. ..

Examples of the resin component contained in the water-based adhesive include polyvinyl alcohol-based resin and urethane-based resin.

Examples of the active energy ray-curable adhesive include compositions that are cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays. Of these, an ultraviolet curable resin composition that is cured by irradiation with ultraviolet rays is preferable. 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 the thermosetting adhesive include those containing an epoxy resin, a silicone resin, a phenol resin, a melamine resin and the like as a main component. In addition to the curable component, the adhesive composition comprises 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 conditioner, and a plasticizer. It may contain additives such as an agent, a defoaming agent, an antistatic agent, and a leveling agent.

(1st bonding layer, 2nd bonding layer, 3rd bonding layer)
The first bonding layer, the second bonding layer, and the third bonding layer are an adhesive layer obtained by curing the adhesive composition or a pressure-sensitive adhesive layer formed by using the pressure-sensitive adhesive composition. As the adhesive composition, those described above can be used.

The pressure-sensitive adhesive composition comprises a pressure-sensitive adhesive. The pressure-sensitive adhesive exhibits adhesiveness by sticking itself to an adherend, and is a so-called pressure-sensitive adhesive. Examples of the pressure-sensitive adhesive include those containing a polymer such as a (meth) acrylic polymer, a silicone polymer, a polyester polymer, a polyurethane polymer, a polyether polymer, or a rubber polymer as a main component. In the present specification, the main component means a component containing 50% by mass or more of the total solid content of the pressure-sensitive adhesive. The pressure-sensitive adhesive may be an active energy ray-curable type or a thermosetting type, or the degree of cross-linking and the adhesive strength may be adjusted by irradiation with active energy rays or heating.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these examples.

[Detection of fluorine atomic weight]
The fluorine atom content was calculated by the following procedure by X-ray photoelectron spectroscopy using an X-ray photoelectron spectroscope (K-Alpha, manufactured by Thermo Scientific Co., Ltd.).

First, a wide scan spectrum was acquired at the measurement spot on the surface of the first retardation layer on the adhesive layer side, and narrow scan spectra were acquired for all the elements detected in the wide scan spectrum. Next, the peak area of the narrow scan spectrum of all the elements was obtained, the elemental composition ratio [atom%] at each measurement spot was calculated, and the elemental amount of the fluorine atom at the measurement spot was calculated. The measurement spot is located at a position of 50 μm and a position of 100 μm in the direction (width direction, winding axis direction) intersecting the end portion of the cured product layer constituting the first retardation layer. , 200 μm position, 500 μm position, 700 μm position, and 1000 μm position.

The 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, path energy: 200 eV,
Duel time: 25 msec, step: 1.0 eV, number of integrations: 5 times ・ Narrow scan analysis (Snap scan);
Pass energy: 150 eV, capture time: 1 second, total number of times: 10 times

[Production Example 1: Preparation of a laminated body (1) having a first retardation layer formed on a first base material layer]
(Preparation of composition for forming an alignment layer)
A 2% by mass aqueous solution of polyvinyl alcohol (polyvinyl alcohol 1000 completely saponified type, manufactured by Wako Pure Chemical Industries, Ltd.) was used as a composition for forming an oriented layer.

(Preparation of the first composition)
2.0 parts of a leveling agent (F-556; manufactured by DIC Corporation) was added to a mixture of the polymerizable liquid crystal compound A and the polymerizable liquid crystal compound B shown below at a mass ratio of 90:10, and polymerization was started. Six parts of the agent 2-dimethylamino-2-benzyl-1- (4-morpholinophenyl) butane-1-one (“Irgacure 369 (Irg369)”, manufactured by BASF Japan KK) were added. Further, N-methyl-2-pyrrolidone (NMP) was added so that the solid content concentration became 13%, and the mixture was stirred at 80 ° C. for 1 hour to obtain the first composition.

＜重合性液晶化合物Ｂ＞

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

<Polymerizable liquid crystal compound B>

(Preparation of laminated body (1))
As the first base material layer, a long cycloolefin film having a thickness of 50 μm and a width of 1100 mm [trade name “ZF-14-50” manufactured by Nippon Zeon Corporation] is subjected to corona treatment, and then an alignment layer is formed. The composition for use was applied using a die coater so that the coating width was 1000 mm (50 mm each from both ends in the width direction of the first substrate layer was an uncoated region), and the temperature was 60 ° C. for 1 minute, and further 80 ° C. The film was dried for 3 minutes to form a film having a thickness of 89 nm. Subsequently, the surface of the obtained film was subjected to a rubbing treatment to form an oriented layer. The rubbing process uses a semi-automatic rubbing device (trade name: LQ-008 type, manufactured by Joyo Engineering Co., Ltd.) and a cloth (trade name: YA-20-RW, manufactured by Yoshikawa Kako Co., Ltd.) with a pushing amount of 0.15 mm. The procedure was carried out under the conditions of a rotation speed of 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, by irradiating with ultraviolet rays (in a nitrogen atmosphere, integrated light amount at a wavelength of 365 nm: 500 mJ / cm ² ) using a high-pressure mercury lamp [trade name of Ushio, Inc.: "Unicure VB-15201BY-A"]. , A cured product layer of the polymerizable liquid crystal compound was formed on the alignment layer provided on the first base material layer. Subsequently, both ends were slit so as to have a width of 45 mm each, and a raw fabric laminated body (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 are selected from the end of the cured product layer of the polymerizable liquid crystal compound of the sheet piece, respectively. The fluorine atomic weight was measured at each of the four measurement spots by the above method, and the average value at each position was obtained. The results are shown in Table 1.

The raw fabric laminated body (1) obtained above was wound into a roll to obtain a raw fabric wound body (1). Both ends of the original fabric wound body (1) in the winding axis direction were subjected to frame treatment (heat treatment) to obtain a wound body (1) of the laminated body (1). The frame processing was performed 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 winding body (1). In the frame processing, the moving speed of the burner is 700 mm / sec, the distance between the burner and the cured product layer located at the end of the original fabric winding body (1) in the winding axis direction is 20 mm, and the original fabric winding body is set to 20 mm. This was performed under the condition that the burner was reciprocated once along the end face in the winding axis direction of (1) (this is called the number of passes of 2 times).

Two positions of 50 μm, 100 μm, 200 μm, 500 μm, 700 μm, and 1000 μm from the frame-treated end of the surface of the first retardation layer of the laminated body (1) unwound from the wound body (1), respectively. The fluorine atomic weights were measured by the above-mentioned method for a total of 12 measurement spots, and the average value at each position was calculated. In addition, the value of the difference between the average value of the fluorine atomic weight obtained for each measurement spot and the average value of the fluorine atomic weight at a position 1000 μm from the end was calculated. The results are shown in Table 2.

[Production Example 2: Preparation of Adhesive Composition]
3', 4'-Epoxy Cyclohexylmethyl 3,4-Epoxy Cyclohexanecarboxylate [Product name "Selokiside 2021P" manufactured by Daicel Co., Ltd.] 1,4-Butanediol diglycidyl ether [Nagase Chemtex] with respect to 75 parts by mass. By adding 25 parts by mass of the product name "EX-214L" manufactured by San-Apro Co., Ltd. and 5.0 parts by mass of the photopolymerization initiator [trade name "CPI-100P" manufactured by Sun Apro Co., Ltd.] and mixing them. An adhesive composition was prepared.

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

After storing the wound body (1) under the condition of a temperature of 23 ° C. for 3 days, the surface of the wound body (1) was visually confirmed, and no unevenness was confirmed.

[Comparative Example 1]
An optical laminated body (2) was obtained in the same manner as in Example 1 except that two raw fabric laminated bodies (1) (width 1010 mm, length 100 m) were used instead of the laminated body (1). A wound body (2) of the optical laminated body (2) was obtained. After the wound body (2) was stored under the condition of a temperature of 23 ° C. for 3 days, the surface of the wound body (2) was visually inspected, and unevenness was confirmed.

1 to 5 Optical laminate, 10 1st retardation layer, 11a, 11b 1st region, 12a, 12b 2nd region, 15 through hole, 18 1st base material layer, 20 adhesive layer, 21 1st bonding layer , 23 3rd bonded layer, 30 optical layer, 31 2nd base material layer, 32 2nd retardation layer (optical layer), 33 3rd retardation layer, 34 3rd base material layer, 35 polarizing plate (optical layer) ), Sa, Sb end.

Claims (9)

An optical laminate in which a first retardation layer including 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 a plan view.
The end portion, the first region, and the second region are arranged in this order along the crossing direction intersecting the end portion in the plan view of the first retardation layer.
On the surface of the first retardation layer on the adhesive layer side, the fluorine content in the first region is smaller than the fluorine content in the second region.
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 the boundary position between the first region and the second region and a position 1000 μm from the end portion in the crossing direction.
On the surface of the first retardation layer on the adhesive layer side, 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. Is an optical laminate that satisfies the relationship of the following formula (A) .
F1 [atm%] ≤ F2 [atm%] -2.5 [atm%] (A) The optical laminate according to claim 1, wherein the thickness of the first retardation layer is 0.5 μm or more and 10 μm or less. The plan view shape of the first retardation layer is rectangular, and is
The optical laminate according to claim 1 or 2 , wherein the end portion is an end portion on the peripheral edge of the rectangle. The first retardation layer has a through hole penetrating in the stacking direction of the optical laminate.
The optical laminate according to any one of claims 1 to 3 , wherein the end portion is an end portion on the peripheral edge of the through hole. The optical laminate according to any one of claims 1 to 4 , wherein the optical layer is a second retardation layer including a cured product layer of a polymerizable liquid crystal compound. In addition, it contains a linear transducer and
The optical laminate according to claim 5 , wherein the linear splitter is laminated on the side opposite to the adhesive layer side of the first retardation layer or the optical layer. The optical laminate according to any one of claims 1 to 4 , wherein the optical layer includes a linear polarizing element. Further, a third retardation layer including a cured product layer of the polymerizable liquid crystal compound is included.
The optical laminate according to claim 7 , wherein the third retardation layer is laminated on the side opposite to the adhesive layer side of the first retardation layer. A wound body obtained by winding the optical laminate according to any one of claims 1 to 8 into a roll shape.

Images