KR20220147034A - Optical laminate and winding body thereof - Google Patents

Abstract

Provided are an optical laminate in which a deformation is suppressed, and a wound body thereof. The 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, and the first region and the second region are arranged in this order along a cross direction intersecting 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 content of fluorine in the first region is smaller than a content of fluorine in the second region.

Description

Optical laminate and its winding body TECHNICAL FIELD

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

DESCRIPTION OF RELATED ART The member containing optical films, such as a polarizing plate and retardation plate, is used for display apparatuses, such as a liquid crystal display device and an organic electroluminescent display. As a member including such an optical film, a liquid crystal composition containing a polymerizable liquid crystal compound is applied on a base layer, and then a polymerizable liquid crystal compound is polymerized and cured to form a retardation layer, and on this retardation layer through an adhesive layer The optical laminated body which laminated|stacked the polarizer is known (for example, patent document 1 etc.).

[Patent Document 1] Japanese Patent Laid-Open No. 2015-191142

The optical laminate is usually manufactured as a long article, and market distribution, storage, etc. are made in the state in which this long optical laminated body was wound in roll shape. In a wound body in which the optical laminate was wound in a roll shape, the entire surface was not smooth in the vicinity of the end portion in the winding axis direction of the wound body, and in particular, it was found that irregularities may occur in a thinned optical laminate. . An optical laminate unrolled from a wound body whose surface is deformed is not suitable for processing to an optical laminate or application to a display device, etc. .

This invention is an optical laminated body which has a retardation layer containing the hardened|cured material layer of a polymeric liquid crystal compound, Comprising: An object of this invention is to provide the optical laminated body with which distortion was suppressed, and its winding body.

This invention provides the following optical laminated bodies.

[1] An optical laminate in which a first retardation layer comprising 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 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 an intersection direction intersecting the end portion in a plan view of the first retardation layer,

In the surface of the first retardation layer on the side of the adhesive layer, the fluorine content in the first region is smaller than the fluorine content in the second region.

[2] The first region includes the end portion and a region between the end portion and a 100 μm position in the crossing direction from the end portion,

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,

In the surface of the first retardation layer on the side of the adhesive layer, the fluorine content F1 [atm%] at a point 100 μm from the end portion and the fluorine content F2 [atm%] at a point 1000 μm from the end portion are as follows The optical laminate according to [1], which satisfies the relationship of 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 first retardation layer has a rectangular shape in plan view,

The optical laminate according to any one of [1] to [3], wherein the end portion is an end portion at the periphery 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 at a 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 comprising a linear polarizer,

The optical laminate according to [6], wherein the linear polarizer is laminated on a 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 polarizer.

[9] Further comprising a third retardation layer comprising a cured material layer of the polymerizable liquid crystal compound,

The optical laminate according to [8], wherein the third retardation layer is laminated on a 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.

ADVANTAGE OF THE INVENTION According to this invention, deformation|transformation of the optical laminated body which has a retardation layer containing the hardened|cured material layer of a polymeric liquid crystal compound can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows typically the optical laminated body which concerns on one Embodiment of this invention.
It is a top view which shows typically an example of the 1st phase difference layer side of the optical laminated body shown in FIG. 1. FIG.
FIG. 3 is a plan view schematically showing another example on the side of the first retardation layer of the optical laminate shown in FIG. 1 .
FIG. 4 is a plan view schematically showing another example of the first phase difference layer side of the optical laminate shown in FIG. 1 .
5 is a cross-sectional view schematically showing an optical laminate according to another embodiment of the present invention.
6 is a cross-sectional view schematically showing an optical laminate according to still another embodiment of the present invention.
7 is a cross-sectional view schematically showing an optical laminate according to still another embodiment of the present invention.
8 is a cross-sectional view schematically showing an optical laminate according to still another embodiment of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the optical laminated body of this invention is described with reference to drawings. Each embodiment shown below may be combined arbitrarily. In each embodiment and each drawing, the same or corresponding reference code|symbol is attached|subjected to the member same or corresponding to the member demonstrated above, and the description may not be repeated. In addition, each drawing is illustrated by adjusting the scale appropriately for easy understanding of each component, and the scale of each component shown in the drawing does not necessarily coincide with the scale of the actual component.

[Embodiment 1]

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows typically the optical laminated body which concerns on this embodiment. 2 and 3 are plan views schematically showing the first phase difference layer side of the optical laminate shown in FIG. 1 .

As for the optical laminated body 1, as shown in FIG. 1, the 1st retardation layer 10, the adhesive bond layer 20, and the optical layer 30 are laminated|stacked in this order. The 1st retardation layer 10 contains the hardened|cured material layer of a polymeric liquid crystal compound, and may further contain the alignment layer for orientating a polymeric liquid crystal compound. The first retardation layer 10 may be, for example, a λ/4 retardation layer, a λ/2 retardation layer, or a positive C layer. 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 a function of transmitting light, a function of reflecting, and an absorption function. The first retardation layer 10 and the adhesive layer 20 are usually formed to be in direct contact. The adhesive layer 20 and the optical layer 30 are usually formed to be in direct contact.

The planar 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 an irregular shape in which a recess is formed on the outer peripheral edge of a rectangle, square or other shape, and a rounded corner shape in which the corners of a rectangle, square or polygon are rounded (shape having R). may have or may have a through hole as described later. The optical laminate 1 may be a sheet body, or a long film-like article may be sufficient as it. When the optical laminated body 1 is a long film-shaped thing, the optical laminated body 1 can be wound in roll shape, and it can be set as a wound body.

As shown in FIG.2 and FIG.3, the 1st retardation layer 10 of the optical laminated body 1 WHEREIN: In planar view, the 1st area|region 11a containing the edge part Sa, and a 1st area|region It has the 2nd area|region 12a adjacent to 11a. The edge part Sa, the 1st area|region 11a, and the 2nd area|region 12a are the 1st intersection direction X1 (intersection direction) which intersect the edge part Sa in the planar view of the 1st phase difference layer 10. ) are arranged in this order. The end Sa is, for example, an end at the outer periphery of the first retardation layer 10, and as shown in FIGS. 2 and 3 , when the planar view shape of the first retardation layer 10 is a rectangle, a rectangle It can be done with the end on the perimeter of the perimeter. The edge part Sa may contain the whole side of the 1st phase difference layer 10, as shown in FIG.2 and FIG.3, and a part of one side may be sufficient as it. The first intersecting direction X1 is not particularly limited as long as it is a direction intersecting the end portion Sa, and as shown in FIGS. 2 and 3 , a direction orthogonal to the end portion Sa may be used.

The surface of the 1st phase difference layer 10 of the optical laminated body 1 by the adhesive bond layer 20 side WHEREIN: The fluorine content of the 1st area|region 11a is smaller than the fluorine content of the 2nd area|region 12a. In this specification, fluorine content means content of a fluorine atom. The fluorine atom content of the surface of the first retardation layer 10 on the adhesive layer 20 side can be measured by the method described in Examples to be described later. The fluorine atoms present in the first retardation layer 10 are fluorine atoms 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 pressing and spreading the adhesive composition on the first retardation layer 10 . When the fluorine content in the region adjacent to the end portion Sa on the adhesive layer 20 side surface of the first retardation layer 10 is the same as or larger than the region adjacent to the region, the end portion Sa vicinity It was found that the thickness of the adhesive layer formed in the region of This is considered to be because, in the region near the end portion Sa having the fluorine content as described above, the adhesive composition tends to stay there due to the bounce or surface tension of the adhesive composition applied or pressed to the region. When the adhesive composition stays in the region near the end portion 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 an adhesive layer having such a non-uniform thickness is wound in a roll shape, the entire surface of the wound body does not become smooth, and irregularities are likely to occur, particularly in the region near the end portion Sa, from the wound body. The released optical laminate may be deformed.

On the other hand, in the optical laminate 1 of this embodiment, as above-mentioned, in the surface on the side of the adhesive bond layer 20 of the 1st retardation layer 10, the edge part Sa of the 1st retardation layer 10. ), the fluorine content of the first region 11a is smaller than the fluorine content of the second region 12a. Therefore, in manufacturing the optical laminate 1, when the adhesive composition is applied on the first retardation layer 10 or pressed and spread, retention of the adhesive composition in the first region 11a occurs. can be suppressed Thereby, since it becomes easy to form the thickness of the adhesive bond layer 20 formed on the 1st retardation layer 10 uniformly over the whole, the surface of the wound body which wound the optical laminated body 1 in roll shape is uneven|corrugated. It is hard to generate|occur|produce this, and the whole surface tends to become smooth. Therefore, the deformation|transformation of the optical laminated body 1 unwound from the wound body can be suppressed.

The fluorine content of the surface on the side of the adhesive layer 20 of the first retardation layer 10 of the optical laminate 1 is usually in the first crossing direction X1 from the end portion Sa included in the first region 11a. increases along with 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 adhesive layer 20 side is in the first crossing direction X1 The range is not particularly limited as long as it is a region smaller than the second region 12a adjacent to . As shown in FIGS. 2 and 3 , the first region 11a is positioned 100 μm apart from the end Sa and the end Sa of the first retardation layer 10 in the first crossing direction X1 . The region between (P1a) may be included. For example, the 1st area|region 11a may be the area|region from the edge part Sa to the position P1a, and, as shown in FIGS. 2 and 3, the 1st intersection from the edge part Sa so as to include the position P1a. A range exceeding 100 µm may be included in the direction X1.

Two or more of the first regions 11a 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 opposing end portions Sa and Sa' of the pair of sides of the first retardation layer, respectively. (10) may provide two. When the first phase difference layer 10 has two or more first regions 11a, the fluorine content in each of the first regions 11a may be the same as or 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 the first The range is not particularly limited as long as it is a larger area than the area 11a. 2 and 3, the 2nd area|region 12a is 1st intersection direction X1 from the boundary position of the 1st area|region 11a and the 2nd area|region 12a, and the edge part Sa, as shown in FIG. It may include the area|region between 1000 micrometers positions P2a. For example, the 2nd area|region 12a may be the area|region from the said boundary position to the position P2a, and, as shown in FIGS. 2 and 3, the 1st crossing direction from the edge part Sa so that it may include the position P2a. (X1) may include a range exceeding 1000 µm. The boundary position between the first region 11a and the second region 12a may be a position P1a, or a position exceeding 100 µm from the end portion Sa in the first crossing direction X1 (position P1a). may be in a position beyond the 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 phase difference 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. 3 , 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 content in each of the second regions 12a may be the same as or different from each other.

The first region 11a includes the region between the end portion Sa and the position P1a, and the second region 12a includes the boundary position and the position P2a between the first region 11a and the second region 12a. ), in the surface of the adhesive layer 20 side of the first retardation layer 10, the fluorine content F1 [atm%] at the position P1a and the position P2a It is preferable that the fluorine content F2 [atm%] satisfy|fills the relationship of following formula (A).

F1[atm%] ≤ F2[atm%] - 2.5[atm%] (A)

F1 may be F2-2.8 or less, F2-3.0 or less may be sufficient, and F2-3.1 or less may be sufficient as it. When F1 is in the range of the said Formula (A), it becomes easy to suppress that retention of an adhesive composition arises in the 1st area|region 11a of the 1st retardation layer 10. Therefore, since it can make it difficult to generate|occur|produce unevenness|corrugation on the surface of the winding object of the optical laminated body 1, the deformation|transformation of the optical laminated body 1 unwound from the winding object can be suppressed.

In the surface on the side of the adhesive bond layer 20 of the 1st retardation layer 10, the fluorine content in the area|region between the edge part Sa and the position P1a is smaller than the fluorine content F1 in the position P1a. it is preferable For example, the fluorine content F50 at a position of 50 µm from the end portion Sa may be F1-1.0 or less, F1-1.5 or less, F1-2.0 or less, and F2-3.0 or less, and F2-4.0 or less. may be sufficient, or F2-5.0 or less may be sufficient.

In the surface of the first retardation layer 10 on the adhesive layer 20 side, the fluorine content between the positions P1a and P2a is larger than the fluorine content F1 at the position P1a, and the position It is preferable that it is smaller than the fluorine content in (P2a). For example, the fluorine content F500 at a position of 500 µm from the end portion Sa may be F2-0.3 or more, F2-0.5 or more, F2-0.7 or more, and F1+1.0 or more, and F1+1.5 or more. , or F1+2.0 or higher.

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 far-end retardation layer containing a fluorine atom is prepared. The far-end retardation layer can be obtained by, for example, coating a composition in which a polymerizable liquid crystal compound and a material containing a fluorine atom are mixed on the first base layer to form an application layer, and polymerizing and curing the polymerizable liquid crystal compound in the coating layer. have. You may form an application layer on the orientation layer formed on the 1st base material layer. A leveling agent etc. are mentioned as a material containing a fluorine atom, for example. It heat-processes to the edge part of the raw material laminated body of the 1st base material layer and raw material retardation layer obtained as mentioned above. Thereby, since the fluorine content of the 1st area|region 11a including the edge part Sa is reduced, the fluorine content of the 1st area|region 11a can be made smaller than the fluorine content of the 2nd area|region 12a.

Although it will not specifically limit as long as it is a process which can reduce the fluorine content of the 1st retardation layer 10 as a heat processing performed to the edge part of a raw material laminated body, For example, a flame process or a yat process which bakes the edge part of a raw material laminated body with a flame, The hot wire process etc. which bake a fabric laminated body with a hot wire are mentioned. Baking by flame or hot wire may be performed in such a way that the end surface of the fabric laminate is quickly burned by the heat of flame or hot wire. The heat treatment may be performed on the end face of a single fabric laminate, but if it is a long fabric laminate, the heat treatment may be performed on the end face of a fabric roll in which the fabric laminate is wound in a roll shape. You may carry out with respect to the end surface of the laminated structure in which the raw material laminated body was laminated|stacked by several sheets (for example, 10-50 sheets).

The optical laminate 1 may be manufactured by, for example, laminating the first retardation layer 10 and the optical layer 30 formed on the first base layer through the adhesive layer 20 . The adhesive composition for forming the adhesive bond layer 20 may apply|coat to the 1st retardation layer 10 side, may apply|coat to the optical layer 30 side, and may apply|coat to both of these. When the first retardation layer 10 and the optical layer 30 are laminated through 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 optical layer Between (30), the adhesive composition is pressed and spread. As a coating method of the adhesive composition, there may be mentioned a known coating method used in the optical field, specifically, spin coating method, extrusion method, gravure coating method, die coating method, slit coating method, bar coating method, comma coating A method, an applicator method, a flexo method, etc. are mentioned. The adhesive layer 20 may be formed by laminating the first retardation layer 10 and the optical layer 30 through an adhesive composition and then curing the first phase difference layer 10 . After forming the adhesive bond layer 20, you may peel the 1st base material layer.

The wound body which wound the optical laminated body 1 in roll shape can be obtained by winding around the core, for example. Although the length of the winding axis direction of a winding object is not specifically limited, Usually, 300 mm or more and 2000 mm or less, 1000 mm or more may be sufficient, 1200 mm or more may be sufficient, Furthermore, 1800 mm or less may be sufficient, and 1500 mm or less may be sufficient. Although the diameter of a winding object is not specifically limited, Usually, 50 mm or more and 1000 mm or less, 100 mm or more may be sufficient, 300 mm or more may be sufficient, Furthermore, 800 mm or less may be sufficient, and 500 mm or less may be sufficient.

[Embodiment 2]

FIG. 4 is a plan view schematically showing another example on the side of the first retardation layer of the optical laminate shown in FIG. 1 . In FIG. 4, the top view of the 1st retardation layer 10 in the case where the 1st retardation layer 10 has the through-hole 15 penetrating in the lamination|stacking direction of the optical laminated body 1 is shown.

As shown in FIG. 4 , the optical laminate 1 has a through hole 15 penetrating through at least the first retardation layer 10 in the lamination direction of the optical laminate 1 . The optical layer 30 and the adhesive layer 20 constituting the optical laminate 1 may have a through hole at a position corresponding to the through hole 15 of the first retardation layer 10 . Moreover, the optical laminated body 1 may have a through-hole so that it may penetrate in the lamination direction, and all the layers which comprise the optical laminated body 1 may have a through-hole.

The shape, size, number, etc. of the through-holes 15 of the 1st retardation layer 10 are not specifically limited, as long as it penetrates in the lamination|stacking direction of the optical laminated body 1 . The shape of the through hole 15 may be, for example, circular (perfect circle); oval; leaf type; polygons such as triangles or squares; At least one corner of the polygon may be a polygon having rounded corners (shaped having R), and the like. 4 shows a case in which the through hole 15 is circular (original).

The diameter of the through hole 15 is preferably 0.5 mm or more, and may be 1 mm or more, may be 2 mm or more, or may be 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 the present specification, the diameter of the through hole 15 refers to the diameter of the circle when the planar shape of the through hole is circular (true circle), and the planar shape of the through hole is other than circular (true circle). In the case of , it refers to the diameter of the circumscribed circle (true circle) of the through hole in plan view.

The number of the through holes 15 included in the first phase difference layer 10 may be one or two or more. In the case of having two or more through-holes 15, the shape and size may be the same or different, respectively.

The first phase difference layer 10 shown in FIG. 4 includes, in a plan view, a first region 11b including an end portion Sb and a second region 12b adjacent to the first region 11b. have The end portion Sb, the first region 11b and the second region 12b have a second intersecting direction X2 (intersecting direction) intersecting the end portion Sb in a plan view of the first phase difference layer 10 . ) are arranged in this order. When the first phase difference layer 10 has the through hole 15, the end portion Sb may be an end of the peripheral edge of the through hole 15, as shown in FIG. 4, or part or all of the end portion Sb. also good The second intersecting 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 through hole 15 of the first retardation layer 10 . In the case of the entire peripheral edge of the portion, it is not limited to the second intersecting direction X2 shown in Fig. 4 , and for example, the same direction as the first intersecting direction X1 shown in Figs. 2 and 3 may be used.

Also in the 1st retardation layer 10 shown in FIG. 4 in the previous embodiment, the 1st area|region 11a including the edge part Sa in the outer periphery of the 1st retardation layer 10 and adjacent to this As described with respect to the second region 12a to be used ( FIGS. 2 and 3 ), the surface of the first retardation layer 10 of the optical laminate 1 on the adhesive layer 20 side WHEREIN: The edge part Sb The fluorine content of the first region 11b including

Fluorine content of the surface of the adhesive layer 20 side of the 1st retardation layer 10 of the optical laminated body 1 is 2nd crossing direction X2 from the edge part Sb normally contained in the 1st area|region 11b normally. increases along with 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 adhesive layer 20 side is in the second crossing direction. The range is not particularly limited as long as it is a region smaller than the second region 12b adjacent to (X2). 4, the 1st area|region 11b may contain the edge part Sb and the area|region between the 100 micrometers position P1b in the 2nd intersection direction X2 from the edge part Sb. For example, the 1st area|region 11b may be the area|region from the edge part Sb to the position P1b, and as shown in FIG. 4, the 2nd intersection direction X2 from the edge part Sb so that it may include the position P1b. and may include a range exceeding 100 µm. Two or more first regions 11b may be provided in the first retardation layer 10, and the fluorine content in each of the first regions 11b may be the same as or different from each other.

The second region 12b is a region adjacent to the first region 11b in the second intersecting direction X2, and the fluorine content of the surface of the first retardation layer 10 on the adhesive layer 20 side is the first The range is not particularly limited as long as it is a larger area than the area 11b. As shown in FIG. 4 , the second region 12b is positioned at a position of 1000 μm in the second intersection direction X2 from the boundary position between the first region 11b and the second region 12b and the end Sb. The region between (P2b) may be included. For example, the second region 12b may be a region from the boundary position to the position P2b, or 1000 in the first intersection direction X1 from the end Sb to include the position P2b as shown in FIG. 4 . You may include the range exceeding micrometer. The boundary position between the first region 11b and the second region 12b may be the position P1b, or a position (position P1b) exceeding 100 μm from the end Sb in the second intersecting direction X2. over) may be present. Two or more second regions 12b may be provided in the first retardation layer 10, and the fluorine content in each of the second regions 12b may be the same as or different from each other.

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 , in the surface of the first retardation 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 are It is preferable to satisfy|fill the relationship of said Formula (A). 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 formed in the first retardation layer 10, the surface of the wound body in which the optical laminate 1 is wound in a roll shape is uneven on the surface. It is thought that this generation|occurrence|production can be suppressed and the smoothness of the whole surface can be improved. Thereby, it is expectable to suppress the deformation|transformation of the optical laminated body 1 unwound from the wound body.

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.

Hereinafter, the specific layer structure of an optical laminated body is demonstrated.

(Example (1) of the optical laminate)

5 and 6 are cross-sectional views schematically showing the optical laminate according to the present embodiment. As for the optical laminated bodies 2 and 3 shown in FIG. 5 and FIG. 6, the optical layer 30 in the optical laminated body 1 shown in FIG. 1 is the 2nd retardation layer 32. As shown in FIG.

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). include A stretched film may be sufficient as the 2nd retardation layer 32, and may contain the hardened|cured material layer of a polymeric 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 aligning the polymerizable liquid crystal compound. The optical laminates 2 and 3 or the first retardation layer 10 may have a through hole penetrating in the lamination direction of the optical laminates 2 and 3 .

As shown in FIG. 5 , the optical laminate 2 is a polarizing plate ( 35) may be laminated|stacked in this order, and the 2nd base material layer 31 may be laminated|stacked on the opposite side to the adhesive bond layer 20 side of the 2nd retardation layer 32. Alternatively, in the optical laminate 2, on the opposite side to the adhesive layer 20 side of the second retardation layer 32, a polarizing plate including a second adhesive layer and a linear polarizer may be laminated in this order, and the first retardation The 1st base material layer may be laminated|stacked on the opposite side to the adhesive bond layer 20 side of the layer 10. The polarizing plate 35 has a protective layer on one or both surfaces of the linear polarizer, and the linear polarizer and the protective layer may be laminated via an adhesive composition or a pressure-sensitive adhesive composition, or a protective layer may be laminated directly on the linear polarizer. The second bonding layer is an adhesive layer that is a cured product of the adhesive composition or a pressure-sensitive adhesive layer formed of the pressure-sensitive adhesive composition.

The optical laminate 3 may have the 1st base material layer 18 on the opposite side to the adhesive bond layer 20 side of the 1st retardation layer 10, as shown in FIG. Moreover, the optical laminated body 3 may have the 2nd base material layer 31 on the opposite side to the adhesive bond layer 20 side of the 2nd retardation layer 32, as further shown in FIG.

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

As for the end portions, the first region and the second region, the ends Sa, Sa' and Sb of the first retardation layer 10, the first regions 11a, 11b, and the second region 12a, respectively; 12b) can be configured as described above. For example, the first 'region may include an end included in the first' region of the second retardation layer 32 and a region between the 100 μm position P1 ′ from the end in the crossing direction. The second 'region is between the boundary position of the first 'region and the second' region of the second retardation layer 32 and a position P2' of 1000 μm in the crossing direction from the end included in the first region. It may contain areas.

In 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' preferably satisfies the relationship of the above formula (A). 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 is a λ/2 retardation layer and a λ/4 retardation layer or a λ/4 retardation layer and a positive C layer. can be heard When one of the first retardation layer 10 and the second retardation layer 32 is a λ/4 retardation layer, the optical laminate 2 can constitute a circularly polarizing plate.

As for the optical laminated body 3 shown in FIG. 6, for example, the 1st laminated body in which the 1st retardation layer 10 was formed on the 1st base material layer 18, and the 2nd retardation on the 2nd base material layer 31. The second laminate on which the layer 32 is formed can be manufactured by laminating it through 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 laminate, or may be applied to the second retardation layer 32 side of the second laminate , may be applied to both of these. An above-described method is mentioned as the application|coating method of an adhesive composition. An adhesive bond layer can be formed by hardening, after laminating|stacking a 1st laminated body and a 2nd laminated body through an adhesive composition.

The optical laminated body 2 shown in FIG. 5 peels the 1st base material layer 18 from the optical laminated body 3 shown in FIG. 6, for example, and it is a 1st on the exposed 1st retardation layer 10 It can be manufactured by laminating the polarizing plate 35 through the bonding layer 21 .

(Example of optical laminate (2))

7 and 8 are cross-sectional views schematically showing the optical laminate according to the present embodiment. As for the optical laminated bodies 4 and 5 shown in FIG. 7 and FIG. 8, the optical layer 30 in the optical laminated body 1 shown in FIG. 1 is the polarizing plate 35 containing a linear polarizer. As shown in FIGS. 7 and 8, the optical laminated bodies 4 and 5 contain the 1st retardation layer 10, the adhesive bond layer 20, and the polarizing plate 35 (optical layer 30). The optical laminates 4 and 5 or the first retardation layer 10 may have a through hole penetrating in the lamination direction of the optical laminates 4 and 5 .

The optical laminate 4 may have the 1st base material layer 18 on the opposite side to the adhesive bond layer 20 of the 1st retardation layer 10, as shown in FIG.

As shown in FIG. 8, the optical laminated body 5 is the 3rd bonding layer 23 and the 3rd retardation layer 33 on the opposite side to the adhesive bond layer 20 side of the 1st retardation layer 10. These may be laminated in this order. On the opposite side to the 3rd bonding layer 23 of the 3rd retardation layer 33, the 3rd base material layer 34 may be laminated|stacked.

A stretched film may be sufficient as the 3rd retardation layer 33, and may contain the hardened|cured material layer of a polymeric liquid crystal compound. When the 3rd retardation layer 33 contains the hardened|cured material layer of a polymeric liquid crystal compound, the surface on the 3rd bonding layer 23 side WHEREIN: As demonstrated with respect to the 2nd retardation layer 32, fluorine content is You may have other areas. The third bonding layer 23 is an adhesive layer or a pressure-sensitive adhesive layer that 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 may constitute 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. can When one of the first retardation layer 10 and the third retardation layer 33 is a λ/4 retardation layer, the optical laminate 5 can constitute a circularly polarizing plate.

The optical laminated body 4 shown in FIG. 7 is a 1st laminated body in which the 1st retardation layer 10 was formed on the 1st base material layer 18, for example, and the polarizing plate 35 containing a linear polarizer, and an adhesive agent. It can be manufactured by laminating through the layer (20). The adhesive composition for forming an adhesive bond layer may apply|coat to the 1st phase difference layer 10 side of a 1st laminated body, may apply|coat to the polarizing plate 35 side, and may apply|coat to both of these. An above-described method is mentioned as the application|coating method of an adhesive composition. An adhesive bond layer can be formed by hardening|curing, after laminating|stacking a 1st laminated body and a polarizing plate through an adhesive composition.

The optical laminated body 5 shown in FIG. 8 peels the 1st base material layer 18 from the optical laminated body 4 shown in FIG. 7, for example, and is a 3rd on the exposed 1st retardation layer 10. Through the bonding layer 23 , it may be manufactured by laminating a third laminate in which the third retardation layer 33 is formed on the third base layer 34 .

Although the thickness of the optical laminated bodies 1-5 is not specifically limited, 500 micrometers or less may be sufficient, 300 micrometers or less may be sufficient, and 200 micrometers or less may be sufficient as it. 10 micrometers or more may be sufficient as the thickness of the optical laminated bodies 1-5, and 50 micrometers or more may be sufficient as them. It is an optical laminate having a thickness of 200 µm or less, and when an optical laminate in which the fluorine content of the surface of the first retardation layer on the adhesive layer side is not adjusted like the optical laminates 1 to 5 is wound in a roll shape, the optical laminate tends to be prone to deformation. On the other hand, as in the optical laminates 1 to 5, by adjusting the fluorine content on the adhesive layer side of the first retardation layer, even when the thickness is 200 μm or less, the deformation occurring in the optical laminates 1 to 5 is suppressed. it becomes easy

Hereinafter, the material etc. used in the optical laminated bodies 1-5 demonstrated above are demonstrated concretely.

(1st retardation layer)

The 1st retardation layer will not be specifically limited if it contains the hardened|cured material layer of a polymeric liquid crystal compound. In addition to the said hardened|cured material layer, the 1st retardation layer may contain the orientation layer for orientating a polymeric liquid crystal compound. The first retardation layer contains a fluorine atom.

Although the thickness of the 1st retardation layer is not specifically limited, 10 micrometers or less may be sufficient, 8 micrometers or less may be sufficient, 5 micrometers or less may be sufficient, and 0.5 micrometer or more may be sufficient, 0.8 micrometer or more may be sufficient, and 1 micrometer or more may be sufficient. When the thickness of the first retardation layer is within the above range, on the adhesive layer side of the first retardation layer, by making the fluorine content in the first region smaller than the fluorine content in the second region, deformation of the optical laminate is effectively reduced can be suppressed

A 1st retardation layer can be formed using the 1st composition containing a polymeric liquid crystal compound, The 1st composition may be called the leveling agent (henceforth "leveling agent (F)" containing a fluorine atom). ) is preferred. As a leveling agent (F), "Megapark (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 the same "F-556" (DIC Co., Ltd.); "Saffron (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 Chemicals Kyusho Co., Ltd.); "F-Top EF301", "F-Top EF303", "F-Top EF351", and "F-Top EF352" (Mitsubishima Technical Co., Ltd.) etc. are 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 capable of participating in a polymerization reaction by an active radical or an acid generated from a 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 oxiranyl group, and an oxetanyl group. . Among them, an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxiranyl group, and an oxetanyl group are preferable, and an acryloyloxy group is more preferable. The kind 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 crystallinity of the polymerizable liquid crystal compound may be either a thermotropic liquid crystal or a lyotropic liquid crystal, and a nematic liquid crystal or a smectic liquid crystal may be used as the phase-order structure.

It is preferable that it is 0.01 mass part or more with respect to 100 mass parts of polymeric liquid crystal compounds, and, as for the leveling agent (F) contained in a 1st composition, it is more preferable that it is 0.05 mass part or more, It is also preferable that it is 5 mass parts or less, and 3 mass parts It is more preferable that it is less than part.

The 1st composition may further contain the leveling agent other than a polymerization initiator, a photosensitizer, a polymerization inhibitor, a solvent, and a leveling agent (F), etc.

The alignment layer which the 1st phase difference layer may contain has the orientation control force which liquid-crystal-aligns a polymeric liquid crystal compound in a desired direction. As an alignment layer, it is preferable to have solvent tolerance which does not melt|dissolve by application|coating of a 1st composition, etc., and to have heat resistance in the heat processing for removal of a solvent or orientation of a polymeric liquid crystal compound. Examples of the alignment layer include an alignment layer each independently containing an alignment polymer, an optical alignment layer, and a groove alignment layer in which a concave-convex pattern or a plurality of grooves are formed on the surface to orientate.

(2nd retardation layer, 3rd retardation layer)

The 2nd retardation layer and the 3rd retardation layer may each independently be a layer comprised from a stretched film, and the thing containing the hardened|cured material layer of a polymeric liquid crystal compound may be sufficient as it. 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 may include an alignment layer for aligning the polymerizable liquid crystal compound, The cured product layer may contain a fluorine atom.

The thickness of the second retardation layer and the third retardation layer is not particularly limited, and each independently may be 50 µm or less, 30 µm or less, 15 µm or less, 13 µm or less, or 10 µm or less, 5 micrometers or less may be sufficient, and 0.1 micrometer or more normally, 0.5 micrometer or more may be sufficient, 1 micrometer or more may be sufficient, 5 micrometers or more may be sufficient, and 10 micrometers or more may be sufficient.

When the second retardation layer and the third retardation layer are stretched films, a stretched film obtained by uniaxially stretching or biaxially stretching a film formed of a resin material exemplified in the first substrate layer, the second substrate layer and the third substrate layer to be described later is used. can

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 may be formed using a 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 2nd composition may contain the leveling agent other than a polymerization initiator, a photosensitizer, a polymerization inhibitor, a solvent, a leveling agent (F), and a leveling agent (F) other than a polymeric liquid crystal compound, etc.

When a 2nd retardation layer and a 3rd retardation layer contain an orientation layer, the orientation layer demonstrated by the orientation layer which the 1st retardation layer may contain can be used for an orientation layer.

(1st base material layer, 2nd base material layer, 3rd base material layer)

It is preferable that the 1st base material layer, the 2nd base material layer, and the 3rd base material layer are each independently a film formed of a resin material. It is preferable to use the resin material excellent in transparency, mechanical strength, thermal stability, etc., for example. It is preferable that the resin material is a thermoplastic resin, For example, Cellulose resin, such as triacetyl cellulose; polyester-based resins such as polyethylene terephthalate and polyethylene naphthalate; polyether sulfone-based resin; polysulfone-based resin; polycarbonate-based resin; polyamide-based resins such as nylon and aromatic polyamide; polyimide-based resin; polyolefin resins such as polyethylene, polypropylene, and ethylene/propylene copolymer; Cyclic polyolefin resin which has a cyclo system and a norbornene structure; (meth)acrylic resin; polyarylate-based resin; polystyrene-based resin; Polyvinyl alcohol-type resin etc. are mentioned. "(meth)acryl" means at least one selected from the group which consists of acryl and methacryl.

The first base layer, the second base layer, and the third base layer may each independently have a single layer structure or a multilayer structure, and in the case of a multilayer structure, each layer may be formed of the same resin material or different resin materials may be formed with

It is preferable that it is 5-300 micrometers, respectively independently from a viewpoint of intensity|strength or workability, and, as for the thickness of a 1st base material layer, a 2nd base material layer, and a 3rd base material layer, it is more preferable that it is 10-200 micrometers.

(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 layered structure of two or more layers laminated through a bonding layer or the like.

Examples of the optical layer include 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 protection film in which a protection film is laminated on one side of the polarizing plate; reflective film; translucent reflective film; brightness enhancement film; optical compensation film; film with anti-glare function; Retardation film, retardation layer, etc. are mentioned.

(polarizer)

The optical laminate may contain the polarizing plate as an optical layer, and may contain the polarizing plate separately from the optical layer. A polarizing plate has a protective layer laminated on one or both surfaces of a linear polarizer. When the protective layer is laminated on only one side of the polarizing plate, in the optical laminate, the protective layer is preferably provided on the opposite side to the first retardation layer side or the second retardation layer side of the linear polarizer.

It is preferable that the linear polarizer and the protective layer are bonded through an adhesive layer or an adhesive layer. As an adhesive composition for forming an adhesive bond layer, and an adhesive composition for forming an adhesive layer, the adhesive composition and adhesive composition mentioned later are mentioned. As a protective layer, the film formed with the resin material illustrated by the 1st base material layer, the 2nd base material layer, and the 3rd base material layer is mentioned.

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, 30 µm or less, usually 10 µm or more, 15 µm or more, 20 µm or more. also good

(linear polarizer)

Examples of the linear polarizer include a PVA polarizing layer in which a dichroic dye is adsorbed and aligned on a polyvinyl alcohol-based 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.

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

The degree of saponification 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, 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-based resin are usually from 1000 to 10000, preferably from 1500 to 5000. The average degree of polymerization of polyvinyl alcohol-type resin can be calculated|required based on JISK6726.

Usually, what formed into a film polyvinyl alcohol-type resin is used as a raw film of a PVA polarizing layer. The polyvinyl alcohol-based resin can be formed by a known method. The thickness of a raw film is 1-150 micrometers normally, and when extending|stretching easiness etc. are considered, Preferably it is 10 micrometers or more.

For the PVA polarizing layer, for example, the raw film is subjected to a process of uniaxial stretching, a process of dyeing the film with a dichroic dye to adsorb the dichroic dye, a process of treating the film with an aqueous boric acid solution, and a process of washing the film with water. , and finally dried. The thickness of the PVA polarizing layer may be 20 µm or less, 15 µm or less, or 10 µm or less, usually 3 µm or more, and 5 µm or more.

The PVA polarizing layer is [i] using a single film of a polyvinyl alcohol-based resin film as a raw film, and in addition to the method of performing uniaxial stretching treatment and dyeing treatment with a dichroic dye for this film, [ii] to the base film A coating solution (aqueous solution, etc.) containing a polyvinyl alcohol-based resin is coated and dried to obtain a base film having a polyvinyl alcohol-based resin layer, and then this is uniaxially stretched for each base film, and then to the polyvinyl alcohol-based resin layer after stretching. It can also be obtained by the method of performing the dyeing|staining process of a dichroic dye with respect to respect and then peeling and removing a base film. As a base film, the film formed using the resin material demonstrated by the 1st base material layer, the 2nd base material layer, and the 3rd base material layer is mentioned.

As the polymerizable liquid crystal compound used to form the liquid crystal polarizing layer, a polymerizable liquid crystal compound having a polymerizable reactive group exemplified by the first composition and the second composition can be used. The liquid crystal polarizing layer is [iii], for example, a method of applying a composition for forming a polarizing layer comprising a polymerizable liquid crystal compound and a dichroic dye on an alignment layer formed on a base film, and polymerizing and curing the polymerizable liquid crystal compound , [iv] It can form by the method of apply|coating the composition for polarizing layer formation on a base film, forming a coating film, and extending|stretching this coating film together with a base film. As a base film, the base film used in said [ii] is mentioned. 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, 5 µm or less, usually 0.1 µm or more, and 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 agent other than the pressure-sensitive adhesive agent (adhesive agent) mentioned 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, and a thermosetting adhesive.

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

As an active energy ray-curable adhesive agent, the composition hardened|cured by irradiation of active energy rays, such as an ultraviolet-ray, a visible light, an electron beam, and X-rays, is mentioned. Among these, it is preferable that it is an ultraviolet curable resin composition hardened|cured by irradiation of an ultraviolet-ray. It is preferable that an epoxy compound is included as a curable component, and, as for an active energy ray-curable adhesive agent, it is more preferable that an alicyclic epoxy compound is included. 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, as a main component, an epoxy resin, a silicone resin, a phenol resin, a melamine resin, and the like. Adhesive composition, in addition to the curable component, a solvent, a sensitizer, a polymerization accelerator, an ion trap agent, an antioxidant, a chain transfer agent, a tackifier, a thermoplastic resin, a filler, a flow regulator, a plasticizer, an antifoaming agent, an antistatic agent, additives such as a leveling agent may contain

(1st bonding layer, 2nd bonding layer, 3rd bonding layer)

A 1st bonding layer, a 2nd bonding layer, and a 3rd bonding layer are the adhesive bond layers formed using the adhesive bond layer or adhesive composition which hardened the adhesive composition. The adhesive composition described above can be used.

The pressure-sensitive adhesive composition includes a pressure-sensitive adhesive. An adhesive expresses adhesiveness by sticking itself to a to-be-adhered body, and is what is called a so-called pressure-sensitive adhesive. Examples of the pressure-sensitive adhesive include those containing, as a main component, a polymer such as a (meth)acrylic polymer, a silicone polymer, a polyester polymer, a polyurethane polymer, a polyether polymer, or a rubber polymer. In this specification, a main component means the component containing 50 mass % or more in the total solid of an adhesive. An active energy ray hardening type or a thermosetting type may be sufficient as an adhesive, and the crosslinking degree and adhesive force may be adjusted by active energy ray irradiation or heating.

[ Example ]

Hereinafter, the present invention will be described more specifically by way of Examples and Comparative Examples, but the present invention is not limited by these examples.

[Detection of Atomic Weight of Fluorine]

The atomic weight of fluorine was calculated by the following means by X-ray photoelectron spectroscopy using an X-ray photoelectron spectrometer (manufactured by Thermo Scientific, K-Alpha).

First, in a measurement spot on the surface of the first retardation layer on the adhesive layer side, a wide scan spectrum was acquired, and a narrow scan spectrum was acquired for all elements detected in the wide scan spectrum. Next, the peak area of the narrow scan spectrum of all elements was calculated|required, the element composition ratio [atom%] in each measurement spot was computed, and the elemental amount of the fluorine atom in a measurement spot was computed. The measurement spots are 50 µm, 100 µm, and 200 µm in a direction (width direction, winding axis direction) crossing the end from the end to which the cured material layer constituting the first retardation layer has undergone the flame treatment. It was set as the position, the position of 500 micrometers, the position of 700 micrometers, and the position of 1000 micrometers.

The measurement conditions are as follows.

(Measuring conditions)

·X-ray source: Al-Kα monochrome (1486.7 eV)

・X-ray spot size (diameter of the measurement spot): 400 μm

• Wide scan analysis (Survey scan);

Measuring 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, number of integrations: 10 times

[Production Example 1: Preparation of a laminate (1) having a first retardation layer formed on a first base layer]

(Preparation of a composition for forming an alignment layer)

A 2 mass % aqueous solution of polyvinyl alcohol (polyvinyl alcohol 1000 fully saponified type, manufactured by Wako Pure Chemical Industries, Ltd.) was used as the composition for forming an alignment layer.

(Preparation of the first composition)

To a mixture obtained by mixing the polymerizable liquid crystal compound A and the polymerizable liquid crystal compound B described below in a mass ratio of 90:10, 2.0 parts of a leveling agent (F-556; manufactured by DIC Corporation) and 2-dimethylamino as a polymerization initiator 6 parts of -2-benzyl-1-(4-morpholinophenyl)butan-1-one (“Irgacure 369 (Irg369)” manufactured by BASF Japan Co., Ltd.) was added. Further, 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.

The polymerizable liquid crystal compound A was manufactured by the method described in Unexamined-Japanese-Patent No. 2010-31223. In addition, the polymerizable liquid crystal compound B was manufactured according to the method described in Unexamined-Japanese-Patent No. 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 base layer, after corona treatment on a long cycloolefin-based film having a thickness of 50 µm and a width of 1100 mm [trade name "ZF-14-50" manufactured by Nippon Zeon Co., Ltd.], the composition for forming an alignment layer is applied using a die coater so that the application width is 1000 mm (each 50 mm from both ends in the width direction of the first base layer is an uncoated area.), at 60°C for 1 minute, and at 80°C for 3 minutes After drying for a minute, a film having a thickness of 89 nm was formed. Next, the surface of the obtained film|membrane was rubbed and the orientation layer was formed. The rubbing treatment was performed by using a semi-automatic rubbing device (trade name: LQ-008 type, manufactured by Joyo Chemical Co., Ltd.) and fabric (trade name: YA-20-RW, manufactured by Yoshikawa Chemical Co., Ltd.), It processed under the conditions of 0.15 mm of press-in amount, 500 rpm of rotations, 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. Thereafter, using a high-pressure mercury lamp (trade name of Ushio Denki Co., Ltd.: "Unicure VB-15201BY-A"), ultraviolet rays were irradiated (in a nitrogen atmosphere, the accumulated light quantity at a wavelength of 365 nm: 500 mJ/cm 2 ) ) to form the cured product layer of the polymerizable liquid crystal compound on the alignment layer provided on the first base layer. Then, both ends were slit so that it might become a width of 45 mm, respectively, and the 1010 mm width raw fabric laminated body (1) was obtained. A sheet piece (width 1010 mm, length 100 mm) is cut out from the obtained raw material 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 atomic weight of fluorine was measured by the method described above for a total of four measurement spots, and an average value at each position was obtained. A result is shown in Table 1.

The fabric laminate (1) obtained above was wound in roll shape, and the fabric wound body (1) was obtained. Flame treatment (heat treatment) was given to both ends of the winding axial direction of the original winding body 1, and the winding body 1 of the laminated body 1 was obtained. The flame treatment 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 axis direction of the fixed original winding body 1 . In the flame treatment, the moving speed of the burner is 700 mm/sec, and the distance between the burner and the cured material layer located at the end in the winding axis direction of the original winding body 1 is 20 mm, and the original winding body 1 is ) was performed under the condition that the burner was moved one reciprocally along the end face in the winding axis direction (this is referred to as the number of passes twice).

Two positions of 50 µm, 100 µm, 200 µm, 500 µm, 700 µm, and 1000 µm each of the surface of the first retardation layer of the laminate 1 unwound from the wound body 1 from the flame-treated end The fluorine atomic weight was measured by the method described above for 12 measurement spots in total, and the average value at each position was calculated. Further, 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 of 1000 µm from the edge was calculated. A result is shown in Table 2.

[Preparation Example 2: Preparation of adhesive composition]

1,4-butanediol diglycidyl with respect to 75 parts by mass of 3',4'-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate [trade name "Celoxide 2021P" manufactured by Daicel Corporation] An adhesive composition was prepared by adding and mixing 25 parts by mass of ether [trade name "EX-214L" manufactured by Nagase Chemtex Co., Ltd.] and 5.0 parts by mass of a photopolymerization initiator [trade name "CPI-100P" manufactured by San Afro Corporation]. prepared

[Example 1]

Two laminates (1) (1010 mm in width, 100 m in length) were prepared. The adhesive composition prepared in manufacture example 2 was apply|coated to the surface of the 1st retardation layer of one laminated body (1), and the 1st retardation layer surface side of the other laminated body (1) was pasted together. Then, by irradiating an ultraviolet-ray (accumulated amount of light 400 mJ/cm<2> (UV-B)), the adhesive composition was hardened, the adhesive bond layer was formed, and the optical laminated body (1) was obtained. The obtained optical laminated body (1) was wound around the core, and the wound body (1) of the optical laminated body (1) was obtained.

After the wound body 1 was stored under the condition of a temperature of 23° C. for 3 days, the surface of the wound body 1 was visually confirmed, and no irregularities were observed.

[Comparative Example 1]

Instead of the laminate (1), the optical laminate (2) was obtained in the same manner as in Example 1 except that two original laminates (1) (1010 mm in width, 100 m in length) were used, and the optical laminate was obtained. The wound body (2) of (2) was obtained. After storing the wound body 2 under the condition of a temperature of 23° C. for 3 days, the surface of the wound body 2 was visually confirmed, and irregularities were confirmed.

1-5: optical laminate, 10: first retardation layer, 11a, 11b: first region, 12a, 12b: second region, 15: through hole, 18: first base layer, 20: adhesive layer, 21: First bonding layer, 23: third bonding layer, 30: optical layer, 31: second base layer, 32: second retardation layer (optical layer), 33: third retardation layer, 34: third base layer, 35 : Polarizing plate (optical layer), Sa, Sb: End.

Claims (9)

An optical laminate in which a first retardation layer, an adhesive layer, and an optical layer including a cured product layer of a polymerizable liquid crystal compound are laminated in this order,
The first retardation layer has a first region including an end 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 an intersection direction intersecting the end portion in a plan view of the first retardation layer,
In the surface of the first retardation layer on the side of the adhesive layer, the fluorine content in the first region is smaller than the fluorine content in the second region,
The first region includes the end and a region between a 100 μm position from the end in the crossing 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,
In the surface of the first retardation layer on the side of the adhesive layer, the fluorine content F1 [atm%] at a point 100 μm from the end portion and the fluorine content F2 [atm%] at a point 1000 μm from the end portion are as follows An optical laminate that satisfies the relationship of formula (A):
F1[atm%] ≤ F2[atm%] - 2.5[atm%] (A). The optical laminate of claim 1 , wherein the thickness of the first retardation layer is 0.5 μm or more and 10 μm or less. The method according to claim 1 or 2, wherein the first retardation layer has a rectangular shape in plan view,
wherein the end is an end at the perimeter of the rectangle. The method according to any one of claims 1 to 3, wherein the first retardation layer has a through hole penetrating in the stacking direction of the optical laminate,
and the end is an end at 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 comprising a layer of a cured product of a polymerizable liquid crystal compound. According to claim 5, further comprising a linear polarizer,
and the linear polarizer is laminated on a 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 polarizer. According to claim 7, further comprising a third retardation layer comprising a cured material layer of the polymerizable liquid crystal compound,
and the third retardation layer is laminated on a side opposite to the adhesive layer side of the first retardation layer. The wound body which wound the optical laminated body in any one of Claims 1-8 in roll shape.

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