JP2020152887A - Pressure sensitive adhesive sheet, manufacturing method of pressure sensitive adhesive sheet, manufacturing method of intermediate laminate and intermediate laminate - Google Patents

Abstract

To provide a pressure sensitive adhesive sheet enabling pigmentation of an adhesive layer through an irradiation of active rays at an arbitrary timing, while preventing a part other than a pigmented part from being pigmented by external light (active rays), and also to provide a manufacturing method of the pressure sensitive adhesive sheet, a manufacturing method of an intermediate laminate obtained by using the pressure sensitive adhesive sheet and an intermediate laminate obtained by the manufacturing method of an intermediate laminate.SOLUTION: A pressure sensitive adhesive sheet 1 includes an adhesive layer 2 and an active ray absorption layer 3 arranged on one side of the adhesive layer 2. The adhesive layer 2 is composed of an adhesive composition capable of lowering a visible light transmittance rate at wavelength 550 nm by irradiation of active rays. An average transmittance of active rays is 15% or less at the active ray absorption layer 3.SELECTED DRAWING: Figure 1

Description

The present invention relates to an adhesive sheet, a method for producing an adhesive sheet, a method for producing an intermediate laminate, and an intermediate laminate. Specifically, the present invention relates to an adhesive sheet, a method for producing the adhesive sheet, and an intermediate laminate obtained by using the adhesive sheet. The present invention relates to a manufacturing method and an intermediate laminated body obtained by the manufacturing method of the intermediate laminated body.

In recent years, a display equipped with an organic EL panel has been known. Since the organic EL panel has a highly reflective electrode layer, external light reflection and background reflection are likely to occur.

Then, in order to prevent reflection of external light and reflection of the background, it is known that a layer having a function of absorbing light is provided on the reflecting surface of the electrode layer.

As such a layer, a light absorption layer containing a carbon black pigment and a dye has been proposed (see, for example, Patent Document 1).

JP-A-2017-203810

On the other hand, when the layer having a function of absorbing light is an adhesive layer, transparency may be required from the viewpoint of inspection or the like.

In such a case, it is considered to include a compound to be colored by an acid and a photoacid generator in the adhesive layer.

When such an adhesive layer is irradiated with an active ray, an acid is generated from the photoacid generator, and the acid colors the compound.

That is, in this adhesive layer, the adhesive layer can be colored by irradiating with active light rays at an arbitrary timing, thereby imparting a function of absorbing light.

However, in such an adhesive layer, depending on the purpose and application, there are cases where it is desired to leave the portion other than the colored portion transparent, or when it is desired to reduce the amount of coloring as compared with the colored portion.

In such a case, when the portion other than the colored portion is exposed to external light (active light), the portion that is desired to remain transparent is colored, and the portion that is desired to be colored less than the colored portion is colored more. There is a problem.

INDUSTRIAL APPLICABILITY The present invention is an adhesive sheet capable of coloring the adhesive layer by irradiating with active light at an arbitrary timing and suppressing coloring of a portion other than the colored portion by external light (active light). It is an object of the present invention to provide a method for producing an adhesive sheet, a method for producing an intermediate laminate obtained by using the adhesive sheet, and an intermediate laminate obtained by the method for producing the intermediate laminate.

The present invention [1] includes an adhesive layer and an active light absorbing layer arranged on one surface of the adhesive layer.
The adhesive layer is made of an adhesive composition capable of reducing the visible light transmittance at a wavelength of 550 nm by irradiation with active light, and the active light absorbing layer has an average transmittance of 15% or less of active light. It is a sheet.

In the present invention [2], the adhesive layer comprises an adhesive composition capable of reducing the visible light transmittance at a wavelength of 550 nm by irradiation with ultraviolet rays, and the active light absorbing layer is an ultraviolet absorbing layer, and the ultraviolet rays. The pressure-sensitive adhesive sheet according to the above [1], wherein the absorption layer has an average transmittance of 15% or less at a wavelength of 300 nm or more and 400 nm or less.

The present invention [3] includes the pressure-sensitive adhesive sheet according to the above [2], wherein the ultraviolet absorbing layer has an average transmittance of 50% or more at a wavelength of 400 nm or more and 700 nm or less.

In the present invention [4], the ultraviolet absorbing layer includes the pressure-sensitive adhesive sheet according to the above [2] or [3], which contains an ultraviolet absorbing agent.

In the present invention [5], any of the above [1] to [4], wherein the adhesive composition contains an adhesive polymer which is a polymer of a monomer component, a compound which is colored by an acid, and a photoacid generator. The adhesive sheet described in item 1 is included.

In the present invention [6], an adhesive layer preparation step of preparing an adhesive layer made of an adhesive composition capable of reducing visible light transmittance at a wavelength of 550 nm by irradiation with active light, and an activity on one surface of the adhesive layer. It includes a method for producing an adhesive sheet, which comprises an arrangement step of arranging an active light absorption layer having an average light transmittance of 15% or less.

The present invention [7] includes the method for producing an adhesive sheet according to the above [6], wherein the adhesive layer is irradiated with active light rays after the adhesive layer preparation step and before the arrangement step.

The present invention [8] includes the method for producing an adhesive sheet according to the above [6], which comprises irradiating an active light beam after the arrangement step.

The present invention [9] is a preparatory step for preparing an adhesive sheet produced by the method for producing an adhesive sheet according to the above [8], in which the adhesive layer is irradiated with active light to be relatively relative to the adhesive layer. By forming a high-irradiation portion where the irradiation amount of the active light is high and a non-irradiation / low-irradiation portion where the irradiation amount of the active light is relatively low or the active light is not irradiated, the wavelength of the high irradiation portion is 550 nm. The visible light transmission rate of the non-irradiated / low-irradiated portion is smaller than the visible light transmission rate at a wavelength of 550 nm, and the other surface of the adhesive sheet is attached to the adherend. It includes a method for producing an intermediate laminate.

The present invention [10] includes the method for producing an intermediate laminate according to the above [9], wherein the irradiation step is carried out after the preparation step, and the attachment step is carried out after the irradiation step. There is.

The present invention [11] includes the method for producing an intermediate laminate according to the above [9], wherein the sticking step is carried out after the preparatory step, and the irradiation step is carried out after the sticking step. I'm out.

The present invention [12] relates to the method for producing an intermediate laminate according to the above [10] or [11], wherein in the irradiation step, the adhesive layer is irradiated with active rays from the surface side of the active light absorbing layer. Includes.

The present invention [13] includes the method for producing an intermediate laminate according to the above [10], wherein in the irradiation step, the adhesive layer is irradiated with active rays from the surface side of the adhesive layer.

The present invention [14] includes the method for producing an intermediate laminate according to the above [11], wherein in the irradiation step, the adhesive layer is irradiated with active light rays from the surface side of the adherend.

In the present invention [15], the average transmittance of active light rays of the adherend is 60% or more, and in the irradiation step, a mask that blocks the active rays is provided on a part of the other surface on the adherend side. The method for producing an intermediate laminate according to the above [14], wherein the adhesive layer is irradiated with an active ray after the arrangement.

The present invention [16] is described in the above [14], wherein the adherend blocks active light rays and arranges the adherend on a part of the other surface of the pressure-sensitive adhesive sheet in the sticking step. Includes a method for producing an intermediate laminate of.

In the present invention [17], the non-irradiated / low-irradiated portion is a non-irradiated portion that is not irradiated with active light, and the visible light transmittance of the non-irradiated portion at a wavelength of 550 nm is 80% or more. The method for producing an intermediate laminate according to any one of [9] to [16] is included.

In the present invention [18], the non-irradiated / low-irradiated portion is a low-irradiated portion in which the irradiation amount of the active light is low, and in the irradiation step, after arranging the first mask that blocks the active light, the adhesive layer. The first irradiation step of forming the first irradiated portion irradiated with the active ray and the temporary non-irradiated portion not irradiated with the active ray on the adhesive layer by irradiating the adhesive layer, and the first irradiation. After arranging a second mask that blocks the active light on the irradiated portion, the temporary non-irradiated portion of the adhesive layer is irradiated with the active light to make the temporary non-irradiated portion a second irradiated portion. Any of the above [9] to [15], which comprises an irradiation step, wherein one of the first irradiation portion and the second irradiation portion is the high irradiation portion and the other is the low irradiation portion. The method for producing an intermediate laminate according to item 1 is included.

In the present invention [19], the non-irradiated / low-irradiated portion is a low-irradiated portion in which the irradiation amount of the active light is low, and the irradiation step is performed by irradiating the entire adhesive layer with the active light. In the third irradiation step in which the entire layer is used as the third irradiation portion irradiated with the active light beam, and after arranging a mask for blocking the active light beam in a part of the third irradiation portion, the third irradiation portion A fourth irradiation step is provided in which the remaining portion of the third irradiation portion is made into a fourth irradiation portion by irradiating the remaining portion with active light, and the third irradiation portion is the low irradiation portion and the fourth irradiation portion. The method for producing an intermediate laminate according to any one of the above [9] to [15], wherein the irradiated portion is the highly irradiated portion.

In the present invention [20], the visible light transmittance of the high irradiation portion at a wavelength of 550 nm is less than 20%, and the visible light transmittance of the low irradiation portion at a wavelength of 550 nm is 20% or more and 70%. The following methods for producing the intermediate laminate according to the above [18] to [19] are included.

The present invention [21] includes an adhesive layer and an adherend having an active light absorbing layer arranged on one surface of the adhesive layer, and an adherend arranged on the other surface of the adhesive sheet. However, the active light absorbing layer comprises a high light transmittance portion having a relatively large visible light transmittance at a wavelength of 550 nm and a low light transmittance portion having a relatively small visible light transmittance at a wavelength of 550 nm. It is an intermediate laminate having an average transmittance of 15% or less of active light.

The present invention [22] includes the intermediate laminate according to the above [21], wherein the low light transmittance portion has a pattern shape.

The present invention [23] includes the intermediate laminate according to the above [21] or [22], wherein the high light transmittance portion has a visible light transmittance of 80% or more at a wavelength of 550 nm.

In the present invention [24], the visible light transmittance of the low light transmittance portion at a wavelength of 550 nm is less than 20%, and the visible light transmittance of the high light transmittance portion at a wavelength of 550 nm is 20%. The intermediate laminate according to the above [21] or [22], which is 70% or more and is 70% or less, is contained.

In the pressure-sensitive adhesive sheet of the present invention, the pressure-sensitive adhesive layer is made of an adhesive composition capable of reducing the visible light transmittance at a wavelength of 550 nm by irradiation with active light rays.

Therefore, the adhesive layer can be colored by irradiating the active light beam at an arbitrary timing, thereby imparting a function of absorbing light.

Further, in this pressure-sensitive adhesive sheet, the average transmittance of active light rays in the active light absorption layer is 15% or less.

Therefore, when it is desired to leave the colored portion other than the colored portion in the adhesive layer transparent, or when it is desired to reduce the amount of coloring as compared with the colored portion, it is possible to prevent the portion other than the colored portion from being colored by external light (active light). ..

The method for producing an adhesive sheet of the present invention includes an arrangement step of arranging an active light absorbing layer on one surface of the adhesive layer.

Therefore, when it is desired to leave the colored portion other than the colored portion in the adhesive layer transparent, or when it is desired to reduce the amount of coloring as compared with the colored portion, it is possible to prevent the portion other than the colored portion from being colored by external light (active light). ..

The method for producing an intermediate laminate of the present invention includes a preparatory step for preparing the pressure-sensitive adhesive sheet of the present invention.

Therefore, in the intermediate laminate obtained by this method for producing the intermediate laminate, it is possible to suppress that the portion other than the colored portion (non-irradiated / low-irradiated portion) is colored by external light (active light).

In the intermediate laminate of the present invention, the average transmittance of active rays in the active ray absorbing layer is 15% or less.

Therefore, it is possible to prevent the portion other than the colored portion (low light transmittance portion) from being colored by external light (active light).

FIG. 1 is a schematic view showing an embodiment of the pressure-sensitive adhesive sheet of the present invention. FIG. 2 is a schematic view showing an embodiment of a method for manufacturing an adhesive sheet, FIG. 2A shows an adhesive layer preparation step for preparing an adhesive layer, and FIG. 2B shows an active ray on one surface of the adhesive layer. The arrangement process of laminating the absorption layer side is shown. FIG. 3 is a schematic view showing an embodiment of a method for producing an adhesive sheet, FIG. 3A shows an adhesive layer preparation step for preparing an adhesive layer, and FIG. 3B shows an adhesive layer from the surface side of the release film. 3C shows a step of irradiating all of the adhesive layer with active light, FIG. 3C shows an arrangement step of laminating an active light absorbing layer on one surface of the adhesive layer, and FIG. 3D shows a case where all of the adhesive layer is irradiated with active light. 3E shows a step of replacing the release film with the active light absorbing layer, FIG. 3E shows a step of irradiating a part of the adhesive layer with active light from the surface side of the release film, and FIG. 3F shows one of the adhesive layers. The arrangement step of laminating the active light absorbing layer is shown in the direction, and FIG. 3G shows the step of replacing the entire release film with the active light absorbing layer when a part of the adhesive layer is irradiated with the active light. 3H indicates a step of replacing a part of the release film with the active light absorbing layer when a part of the adhesive layer is irradiated with the active light. FIG. 4 is a schematic view showing an embodiment of the intermediate laminate of the present invention. FIG. 5 is a schematic view showing a first A embodiment of the method for producing an intermediate laminate of the present invention, FIG. 5A shows a preparatory step for preparing an adhesive sheet, and FIG. 5B shows a surface side of a release film ( The irradiation step of irradiating the adhesive layer with active light rays from the surface side of the adhesive layer) is shown, and FIG. 5C shows the attachment step of attaching the adhesive sheet to the adherend. FIG. 6 is a schematic view showing a first B embodiment of the method for producing an intermediate laminate of the present invention, FIG. 6A shows a preparatory step for preparing an adhesive sheet, and FIG. 6B is a surface of an active light absorbing layer. The irradiation step of irradiating the adhesive layer with the active light beam from the side is shown, and FIG. 6C shows the attachment step of attaching the adhesive sheet to the adherend. FIG. 7 is a schematic view showing a second A embodiment (when the adherend is the first adherend) of the method for producing an intermediate laminate of the present invention, and FIG. 7A is a preparation for preparing an adhesive sheet. The process is shown, FIG. 7B shows a sticking step of sticking the adhesive sheet to the first adherend, and FIG. 7C shows an irradiation step of irradiating the adhesive layer with active light from the surface side of the first adherend. Shown, FIG. 7D shows an intermediate laminate produced in the second A embodiment (when the adherend is the first adherend). FIG. 8 is a schematic view showing a second A embodiment (when the adherend is the second adherend) of the method for producing an intermediate laminate of the present invention, and FIG. 8A is a preparation for preparing an adhesive sheet. The process is shown, FIG. 8B shows a sticking step of sticking the adhesive sheet to the second adherend, and FIG. 8C shows an irradiation step of irradiating the adhesive layer with active light from the surface side of the second adherend. Shown, FIG. 8D shows an intermediate laminate produced in the second A embodiment (when the adherend is the second adherend). FIG. 9 is a schematic view showing a second B embodiment of the method for producing an intermediate laminate of the present invention, FIG. 9A shows a preparatory step for preparing an adhesive sheet, and FIG. 9B shows an adherend to the adhesive sheet. 9C shows an irradiation step of irradiating the adhesive layer with active light from the surface side of the active light absorbing layer, and FIG. 9D shows an intermediate laminate manufactured in the second B embodiment. Is shown. FIG. 10 is a schematic view showing a first modification of the first A embodiment of the method for producing an intermediate laminate of the present invention, FIG. 10A shows a preparatory step for preparing an adhesive sheet, and FIG. 10B shows activity. The first irradiation step of forming the first irradiation part and the temporary non-irradiation part by irradiating the light beam is shown, and FIG. 10C shows the temporary non-irradiation part by irradiating the temporary non-irradiated part with the active light beam. , The second irradiation step to make the second irradiation part is shown, and FIG. 10D shows the sticking step of sticking the adhesive sheet to the adherend. FIG. 11 is a schematic view showing a second modification of the first A embodiment of the method for producing an intermediate laminate of the present invention, FIG. 11A shows a preparatory step for preparing an adhesive sheet, and FIG. 11B shows adhesive. A third irradiation step is shown in which the entire adhesive layer is used as the third irradiation portion by irradiating the entire layer with the active light, and FIG. 11C shows a mask that blocks the active light on a part of the third irradiation portion. The fourth irradiation step is shown in which the remaining portion of the third irradiation portion is made into the fourth irradiation portion by irradiating the remaining portion of the third irradiation portion with active light after arranging the third irradiation portion. FIG. The sticking process to stick to the body is shown. FIG. 12 is a schematic view showing a method for producing an intermediate laminate in which a low light transmittance portion of the adhesive layer has a pattern shape, and FIG. 12A shows an irradiation step in which a plurality of masks for blocking active rays are arranged. FIG. 12B shows an intermediate laminate in which the low light transmittance portion of the adhesive layer has a pattern shape.

1. 1. Adhesive sheet As shown in FIG. 1, the adhesive sheet 1 has a film shape (including a sheet shape) having a predetermined thickness, extends in a direction orthogonal to the thickness direction (plane direction), and has a flat upper surface and a flat surface. It has a lower surface.

Specifically, the pressure-sensitive adhesive sheet 1 includes an active light absorbing layer 3 arranged on one surface of the pressure-sensitive adhesive layer 2 and the pressure-sensitive adhesive layer 2.

Hereinafter, each layer constituting the adhesive sheet 1 will be described.
1-1. Adhesive layer The adhesive layer 2 is an upper layer of the adhesive sheet 1.

The adhesive layer 2 is a pressure-sensitive adhesive layer for adhering the adhesive sheet 1 to the adherend 4 (described later).

The adhesive layer 2 has a film shape extending in the plane direction, and has a flat flat surface and a flat lower surface.

The adhesive layer 2 is made of an adhesive composition capable of reducing the visible light transmittance at a wavelength of 550 nm by irradiation with active rays.

Therefore, the adhesive layer 2 can be colored by irradiating the adhesive layer 2 with active light rays at an arbitrary timing, thereby imparting a function of absorbing light.

Examples of the active light include ultraviolet rays, visible light, infrared rays, X-rays, α-rays, β-rays, and γ-rays, and preferably ultraviolet rays from the viewpoint of variety of equipment used and ease of handling.

Further, the ultraviolet ray means an electromagnetic wave having a wavelength range of 1 nm or more and 400 nm or less.

That is, the adhesive layer 2 is made of an adhesive composition capable of reducing the visible light transmittance at a wavelength of 550 nm by irradiation with ultraviolet rays.

The type of active light that can reduce the visible light transmittance at a wavelength of 550 nm in the adhesive composition is the type of photoacid generator described later (specifically, the photoacid generator generates acid). It depends on the wavelength of the active light).

The tacky composition comprises a tacky polymer, a compound that is colored with an acid, and a photoacid generator.

If the adhesive composition contains an adhesive polymer, a compound colored by an acid, and a photoacid generator, visible light of the adhesive layer 2 at a wavelength of 550 nm by irradiation with active light (preferably ultraviolet rays). The transmittance can be reliably reduced.

The tacky polymer is formulated to impart stickiness.

The adhesive polymer is a polymer of a monomer component (described later), and examples thereof include an acrylic polymer, a silicone polymer, a urethane polymer, and a rubber polymer, which include optical transparency, adhesiveness, and storage. From the viewpoint of controlling the elasticity, an acrylic polymer is preferable.

The acrylic polymer is obtained by polymerizing a monomer component containing a (meth) acrylic acid alkyl ester as a main component.

The (meth) acrylic acid alkyl ester is an acrylic acid ester and / or a methacrylate ester, for example, methyl (meth) acrylic acid, ethyl (meth) acrylic acid, propyl (meth) acrylic acid, (meth) acrylic acid. Butyl, isopropyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, s-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, (meth) ) Isopentyl acrylate, (meth) neo-pentyl acrylate, (meth) hexyl acrylate, (meth) heptyl acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate, ( Nonyl acrylate, Isononyl (meth) acrylate, Decyl (meth) acrylate, Isodecyl (meth) acrylate, Undecyl (meth) acrylate, Dodecyl (meth) acrylate, Isotridodecyl (meth) acrylate, Tetradecyl (meth) acrylate, isotetradecyl (meth) acrylate, pentadecyl (meth) acrylate, cetyl (meth) acrylate, heptadecyl (meth) acrylate, octadecyl (meth) acrylate, iso (meth) acrylate Linear or branched (meth) acrylic acid C1-20 alkyl esters such as octadecyl, nonadecil (meth) acrylic acid, and eicosyl (meth) acrylic acid are mentioned, preferably (meth) acrylic acid C4-. 12 Alkyl esters, more preferably butyl acrylate.

The (meth) acrylic acid alkyl ester can be used alone or in combination of two or more.

The blending ratio of the (meth) acrylic acid alkyl ester is, for example, 50% by mass or more, preferably 60% by mass or more, and for example, 99% by mass or less, based on the monomer component.

In addition, the monomer component preferably contains an acidic vinyl monomer having an anionic group.

If the monomer component contains an acidic vinyl monomer having an anionic group, the dissociation is promoted by the strong acid generated from the photoacid generator (described later), the color becomes stronger, and the coloring stability is excellent.

Examples of the acidic vinyl monomer having an anionic group include a carboxyl group-containing vinyl monomer, a sulfo group-containing vinyl monomer, and a phosphoric acid group-containing vinyl monomer.

Examples of the carboxyl group-containing vinyl monomer include (meth) acrylic acid, 2-carboxyethyl (meth) acrylate, carboxypentyl carboxypentyl (meth) acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid. Be done.

Further, examples of the carboxyl group-containing vinyl monomer include an acid anhydride group-containing monomer such as maleic anhydride and itaconic anhydride.

Examples of the sulfo group-containing vinyl monomer include styrene sulfonic acid and allyl sulfonic acid.

Examples of the phosphoric acid group-containing vinyl monomer include 2-hydroxyethylacryloyl phosphate and the like.

Examples of the acidic vinyl monomer having an anionic group include a carboxyl group-containing vinyl monomer, more preferably (meth) acrylic acid, and even more preferably acrylic acid.

The acidic vinyl monomer having an anionic group can be used alone or in combination of two or more.

The blending ratio of the acidic vinyl monomer having an anionic group is, for example, 3 parts by mass or more, and for example, 10 parts by mass or less, based on 100 parts by mass of the (meth) acrylic acid alkyl ester, and the monomer. It is, for example, 1% by mass or more and, for example, 8% by mass or less with respect to the component.

Also, the monomer component preferably is substantially free of basic vinyl monomers having a lone electron pair copolymerizable with the (meth) acrylic acid alkyl ester.

Specifically, the blending ratio of the basic vinyl monomer having a lone electron pair is, for example, 3% by mass or less, preferably 1% by mass or less, and more preferably 0.5% by mass or less with respect to the monomer component. , Especially preferably 0% by mass or less. In other words, particularly preferably, the monomer component does not include a basic vinyl monomer having a lone pair of electrons.

If the monomer component does not substantially contain a basic vinyl monomer having a lone electron pair, the elution of each monomer component can be suppressed and the coloring stability can be improved.

The basic vinyl monomer having an isolated electron pair is a heterocycle-containing basic vinyl monomer having nitrogen in the heterocycle, and is, for example, N-vinylpyrrolidone, methylvinylpyrrolidone, vinylpyridine, vinylpiperidone, vinylpyrimidine, vinylpiperazin. , Vinylpyrazine, vinylpyrrole, vinylimidazole, vinyloxazole, vinylmorpholin, N-acryloylmorpholin, N-vinylcaprolactam and the like.

Further, the monomer component is, if necessary, a functional group-containing vinyl monomer copolymerizable with the (meth) acrylic acid alkyl ester (excluding the above-mentioned acidic vinyl monomer having an anionic group and the basic vinyl monomer having a lone electron pair). Includes.

Examples of the functional group-containing vinyl monomer include a hydroxyl group-containing vinyl monomer, a cyano group-containing vinyl monomer, a glycidyl group-containing vinyl monomer, an aromatic vinyl monomer, a vinyl ester monomer, and a vinyl ether monomer.

Examples of the hydroxyl group-containing vinyl monomer include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 6-hydroxyhexyl (meth) acrylate. Examples thereof include 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate, and 4- (hydroxymethyl) cyclohexyl) methyl (meth) acrylate, which are preferable. Is 2-hydroxyethyl (meth) acrylate, more preferably 2-hydroxyethyl acrylate.

Examples of the cyano group-containing vinyl monomer include (meth) acrylonitrile.

Examples of the glycidyl group-containing vinyl monomer include glycidyl (meth) acrylate.

Examples of the aromatic vinyl monomer include styrene, p-methylstyrene, o-methylstyrene, α-methylstyrene and the like.

Examples of the vinyl ester monomer include vinyl acetate and vinyl propionate.

Examples of the vinyl ether monomer include methyl vinyl ether and the like.

The functional group-containing vinyl monomer can be used alone or in combination of two or more. When a cross-linking agent (described later) is blended, a hydroxyl group-containing vinyl monomer is preferable from the viewpoint of introducing a cross-linked structure into the polymer.

The blending ratio of the functional group-containing vinyl monomer is, for example, 3 parts by mass or more, preferably 5 parts by mass or more, and more preferably 15 parts by mass or more with respect to 100 parts by mass of the (meth) acrylic acid alkyl ester. Further, for example, it is 20 parts by mass or less, and is, for example, 4% by mass or more, preferably 10% by mass or more, and, for example, 30% by mass or less, preferably 20% by mass, based on the monomer component. % Or less.

The acrylic polymer is a polymer obtained by polymerizing the above-mentioned monomer components.

In order to polymerize the monomer component, for example, a (meth) acrylic acid alkyl ester and, if necessary, an acidic vinyl monomer having an anionic group and a functional group-containing vinyl monomer are blended to prepare a monomer component, which is then combined. For example, it is prepared by a known polymerization method such as solution polymerization, massive polymerization, and emulsion polymerization.

The polymerization method is preferably solution polymerization.

In solution polymerization, for example, a monomer component and a polymerization initiator are mixed with a known organic solvent to prepare a monomer solution, and then the monomer solution is heated.

Examples of the polymerization initiator include peroxide-based polymerization initiators and azo-based polymerization initiators.

Examples of the peroxide-based polymerization initiator include organic peroxides such as peroxycarbonate, ketone peroxide, peroxyketal, hydroperoxide, dialkyl peroxide, diacyl peroxide, and peroxy ester.

Examples of the azo polymerization initiator include 2,2'-azobisisobutyronitrile, 2,2'-azobis (2-methylbutyronitrile), and 2,2'-azobis (2,4-dimethylvalero). Nitriles), azo compounds such as 2,2'-azobisisobutyrate dimethyl.

Examples of the polymerization initiator include azo-based polymerization initiators, and more preferably 2,2'-azobisisobutyronitrile.

The polymerization initiator can be used alone or in combination of two or more.

The blending ratio of the polymerization initiator is, for example, 0.05 parts by mass or more, preferably 0.1 parts by mass or more, and for example, 1 part by mass or less, preferably 1 part by mass, based on 100 parts by mass of the monomer component. It is 0.5 parts by mass or less.

The heating temperature is, for example, 50 ° C. or higher and 80 ° C. or lower, and the heating time is, for example, 1 hour or longer and 8 hours or lower.

As a result, the monomer components are polymerized to obtain an acrylic polymer solution containing an acrylic polymer.

The solid content concentration of the acrylic polymer solution is, for example, 20% by mass or more, and for example, 80% by mass or less.

The weight average molecular weight of the acrylic polymer is, for example, 100,000 or more, preferably 300,000 or more, more preferably 500,000 or more, and for example, 5,000,000 or less, preferably 3,000,000 or less, more preferably 2000000 or less.

The weight average molecular weight is a value measured by GPC (gel permeation chromatography) and calculated in terms of polystyrene.

The glass transition temperature of the adhesive polymer is, for example, 0 ° C. or lower, preferably −20 ° C. or lower, and usually −70 ° C. or higher.

When the glass transition temperature of the adhesive polymer is not more than the above upper limit, the step followability is excellent.

The glass transition temperature is obtained by calculation by the FOX formula.

The acid-colored compound is a compound that changes from colorless (transparent) to colored by acid, and is a triaryl such as a leuco dye, for example, p, p', p "-tris-dimethylaminotriphenylmethane. Diphenylmethane dyes such as methane dyes such as 4,4-bis-dimethylaminophenylbenzhydrylbenzyl ether, fluorane dyes such as 3-diethylamino-6-methyl-7-chlorofluorane, eg 3 Spiropyran dyes such as −methylspirodinaphthopyrane, for example, rhodamine dyes such as Rhodamine-B-anilinolactam, and the like, preferably leuco dyes.

The acid-colored compounds can be used alone or in combination of two or more.

The compounding ratio of the compound to be colored by the acid is, for example, 0.5 parts by mass or more, and for example, 5 parts by mass or less, preferably 2 parts by mass or less, based on 100 parts by mass of the adhesive polymer.

A photoacid generator is a compound that generates an acid when irradiated with active light.

Among such photoacid generators, examples of compounds that generate acids by irradiation with ultraviolet rays (ultraviolet acid generators) include onium compounds.

Examples of onium compounds include onium cations such as iodonium and sulfonium, Cl ⁻ , Br ⁻ , I ⁻ , ZnCl ₃ ⁻ , HSO ₃ ⁻ , BF ₄ ⁻ , PF ₆ ⁻ , AsF ₆ ⁻ , SbF ₆ ⁻ , and CH. Examples thereof include salts composed of anions such as ₃ SO ₃ ⁻ , CF ₃ SO ₃ ⁻ , (C ₆ F ₅ ) ₄ B ⁻ , and (C ₄ H ₉ ) ₄ B ⁻ .

Preferred examples of such an onium compound include a salt composed of sulfonium (onium cation) and (C ₆ F ₅ ) ₄ B ⁻ (anion).

As the ultraviolet acid generator, can also be used commercially available products, for example, CPI-310B (sulfonium and _{(C 6 F 5) 4 B} - consisting of a salt, manufactured by San-Apro Ltd.).

The photoacid generator can be used alone or in combination of two or more.

The blending ratio of the photoacid generator is, for example, 1 part by mass or more, and for example, 20 parts by mass or less, preferably 15 parts by mass or less, based on 100 parts by mass of the adhesive polymer.

Then, in the adhesive composition, an adhesive polymer (a polymer solution when the adhesive polymer is prepared by solution polymerization), a compound to be colored with an acid, and a photoacid generator are mixed and mixed in the above ratios. (When a polymer solution is used as the adhesive polymer, it is prepared as a solution of the adhesive composition).

The adhesive composition is preferably blended with a cross-linking agent from the viewpoint of introducing a cross-linked structure into the adhesive polymer.

Examples of the cross-linking agent include isocyanate-based cross-linking agents, epoxy-based cross-linking agents, oxazoline-based cross-linking agents, aziridine-based cross-linking agents, carbodiimide-based cross-linking agents, and metal chelate-based cross-linking agents.

Examples of the isocyanate-based cross-linking agent include aliphatic diisocyanates such as butylene diisocyanate and hexamethylene diisocyanate, and alicyclic diisocyanates such as cyclopentylene diisocyanate, cyclohexylene diisocyanate, and isophorone diisocyanate, for example, 2,4-tolylene diisocyanate. Examples thereof include aromatic diisocyanates such as isocyanate, 4,4'-diphenylmethane diisocyanate, and xylylene diisocyanate.

Further, examples of the isocyanate-based cross-linking agent include the above-mentioned derivatives of isocyanate (for example, isocyanurate-modified product, polyol-modified product, etc.).

Commercially available products can also be used as the isocyanate-based cross-linking agent, for example, Coronate L (trimethylolpropane adduct of tolylene diisocyanate, manufactured by Tosoh), Coronate HL (trimethylolpropane adduct of hexamethylene diisocyanate, manufactured by Tosoh). ), Coronate HX (isocyanurate of hexamethylene diisocyanate, manufactured by Tosoh), Takenate D110N (trimethylolpropane adduct of xylylene diisocyanate, manufactured by Mitsui Chemicals, Inc.) and the like.

Preferred examples of the isocyanate-based cross-linking agent include a trimethylolpropane adduct of hexamethylene diisocyanate and a trimethylolpropane adduct of xylylene diisocyanate.

Examples of the epoxy-based cross-linking agent include diglycidyl aniline and 1,3-bis (N, N-diglycidyl aminomethyl) cyclohexane.

As the epoxy-based cross-linking agent, a commercially available product can also be used, and examples thereof include Tetrad C (manufactured by Mitsubishi Gas Chemical Company).

The epoxy-based cross-linking agent is preferably 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane.

Examples of the cross-linking agent include an isocyanate-based cross-linking agent, an epoxy-based cross-linking agent, and more preferably an epoxy-based cross-linking agent.

The cross-linking agent can be used alone or in combination of two or more.

When a cross-linking agent is added to the adhesive composition, functional groups such as hydroxyl groups in the polymer react with the cross-linking agent to introduce a cross-linked structure into the polymer.

The blending ratio of the cross-linking agent is, for example, 0.01 part by mass or more, preferably 0.1 part by mass or more, and for example, 10 parts by mass or less, preferably 10 parts by mass, based on 100 parts by mass of the adhesive polymer. It is 5 parts by mass or less, more preferably 4 parts by mass or less, further preferably 3 parts by mass or less, and particularly preferably 1 part by mass or less.

Further, when a cross-linking agent is added to the adhesive composition, a cross-linking catalyst may be added in order to promote the cross-linking reaction.

Examples of the cross-linking catalyst include metal-based cross-linking catalysts such as tetra-n-butyl titanate, tetraisopropyl titanate, ferric nasem, butyl tin oxide, and dioctyl tin dilaurate.

The cross-linking catalyst can be used alone or in combination of two or more.

The blending ratio of the cross-linking catalyst is, for example, 0.001 part by mass or more, preferably 0.01 part by mass or more, and for example, 0.05 part by mass or less with respect to 100 parts by mass of the adhesive polymer. ..

In addition, the adhesive composition may contain, for example, a silane coupling agent, an adhesive-imparting agent, a plasticizer, a softening agent, an antioxidant, a filler, a colorant, a surfactant, an antistatic agent, and the like. From the viewpoint of stabilization under fluorescent light or natural light, various additives such as additives such as an ultraviolet absorber and an antioxidant can be contained within a range that does not impair the effects of the present invention.

As a result, a sticky composition (when a polymer solution is used as the sticky polymer, a solution of the sticky composition) is obtained.

The shear storage elastic modulus G'of this adhesive composition (solid content) at 20 ° C. to 50 ° C. is, for example, 1.0 × 10 ⁴ Pa or more, preferably 2.0 × 10 ⁴ Pa or more, more preferably. It is 4.0 × 10 ⁴ Pa or more, and for example, 1.0 × 10 ⁶ Pa or less, preferably 5.0 × 10 ⁵ Pa or less.

When the shear storage elastic modulus G'is within the above range, the adhesion is excellent, and when the shear storage elastic modulus G'is lower, the step followability is also excellent.

The shear storage elastic modulus G'is measured by dynamic viscoelasticity measurement under the conditions of a frequency of 1 Hz, a heating rate of 5 ° C./min, and a temperature range of −70 ° C. to 250 ° C.

Then, the adhesive layer 2 is formed from the adhesive composition by the method described later.

Since the adhesive layer 2 is made of an adhesive composition, it is adhered by generating an acid from a photoacid generator by irradiation with active light (preferably ultraviolet rays) and coloring the compound colored by the acid with the acid. Layer 2 changes from colorless (transparent) to colored. That is, the adhesive layer 2 is colorless (transparent) before irradiation with active light (preferably ultraviolet rays).

Further, colorless (transparent) means that the average transmittance at a wavelength of 400 nm or more and 700 nm or less is, for example, 60% or more, preferably 70% or more, more preferably 90% or more, and for example, 100% or less. Means that

Further, "colored" means that the average transmittance at a wavelength of 400 nm or more and 700 nm or less is, for example, 0% or more, and for example, less than 60%, preferably 50% or less.

The thickness of the adhesive layer 2 is, for example, 3 μm or more, preferably 10 μm or more, and for example, 50 μm or less, preferably 30 μm or less.
1-2. Active light absorbing layer The active light absorbing layer 3 is arranged on the entire surface of one surface of the adhesive layer 2, and the active light absorbing layer 3 is a lower layer of the adhesive sheet 1.

The active light absorbing layer 3 has a film shape extending in the plane direction, and has a flat flat surface and a flat lower surface.

The active light absorbing layer 3 has an active light absorbing property.

Specifically, the average transmittance of active rays of the active ray absorbing layer 3 is 15% or less, preferably 10% or less, more preferably 9% or less, still more preferably 8% or less, and particularly preferably. , 7% or less, most preferably 3% or less, and further 1% or less.

When the above average transmittance is equal to or less than the above upper limit, when it is desired to leave the portion other than the colored portion in the adhesive layer 2 transparent, or when it is desired to reduce the amount of coloring compared to the colored portion, the portion other than the colored portion may be used. Coloring by external light (ultraviolet rays) can be suppressed. ..

On the other hand, when the above-mentioned average transmittance exceeds the above-mentioned upper limit, it cannot be suppressed that the portion other than the colored portion is colored by external light (active light).

The method for measuring the average transmittance will be described in detail in Examples described later.

Further, the active light absorbing layer 3 preferably has an ultraviolet absorbing property.

That is, the active light absorbing layer 3 is preferably an ultraviolet absorbing layer.

If the active light absorbing layer 3 is an ultraviolet absorbing layer, there are advantages such as reflection control and a wide range of choices of usable materials.

Examples of the ultraviolet absorbing layer include a resin film containing an ultraviolet absorbing agent and an adhesive tape containing an ultraviolet absorbing agent. That is, such an ultraviolet absorbing layer contains an ultraviolet absorbing agent. If the ultraviolet absorbing layer includes an ultraviolet absorber, the average transmittance of the ultraviolet absorbing layer at a wavelength of 300 nm or more and 400 nm or less can be surely lowered.

The material constituting the resin film is a material that does not have ultraviolet absorption unless an ultraviolet absorber is blended, and is, for example, a cellulose resin such as triacetyl cellulose (TAC), for example, a cyclic polyolefin resin such as a cycloolefin polymer. For example, acrylic resin, phenylmaleimide resin, polycarbonate resin, polyester resin, polyamide resin, polystyrene resin and the like can be mentioned, preferably cellulose resin, and more preferably triacetyl cellulose (TAC).

These materials can be used alone or in combination of two or more.

Examples of the ultraviolet absorber include benzotriazole-based compounds, hydroxyphenyltriazine-based compounds, benzophenone-based compounds, salicylic acid ester-based compounds, cyanoacrylate-based compounds, and nickel complex salt-based compounds.

The ultraviolet absorber can be used alone or in combination of two or more.

As the resin film containing the ultraviolet absorber, a commercially available product can also be used, and examples thereof include KC2UA (TAC film, manufactured by Konica Minolta).

Further, as the adhesive tape containing the ultraviolet absorber, a commercially available product can be used, and examples thereof include CS9934U (manufactured by Nitto Denko KK).

Further, as the ultraviolet absorbing layer, a film formed from a material that absorbs ultraviolet rays without blending an ultraviolet absorbing agent, for example, a polyimide film and the like can be mentioned.

As the polyimide film, a commercially available product can also be used, and examples thereof include Kapton 200H (manufactured by Toray DuPont).

The average transmittance of the ultraviolet absorbing layer at a wavelength of 300 nm or more and 400 nm or less is, for example, 15% or less, preferably 10% or less, more preferably 9% or less, still more preferably 8% or less, and particularly preferably 7. % Or less, most preferably 3% or less, and even 1% or less.

When the above average transmittance is equal to or less than the above upper limit, when it is desired to leave the portion other than the colored portion in the adhesive layer 2 transparent, or when it is desired to reduce the amount of coloring compared to the colored portion, the portion other than the colored portion may be used. Coloring by external light (ultraviolet rays) can be suppressed.

The average transmittance of the ultraviolet absorbing layer at a wavelength of 400 nm or more and 700 nm or less is, for example, 40% or more, preferably 50% or more, more preferably 70% or more, still more preferably 80% or more, and particularly preferably 80% or more. , 85% or more, most preferably 90% or more.

When the average transmittance is equal to or higher than the lower limit, the ultraviolet absorbing layer is excellent in transparency.

Therefore, the pressure-sensitive adhesive sheet 1 can be suitably used for an optical device and its components that require transparency.

The thickness of the active light absorbing layer 3 is such that the above-mentioned average transmittance can be obtained, for example, 10 μm or more, preferably 20 μm or more, and for example, 200 μm or less, preferably 120 μm or less, more preferably. Is 50 μm or less.

The active light absorbing layer 3 may be one layer or a plurality of layers.

When the active light absorbing layer 3 is a plurality of layers, a plurality of the same or different types of active light absorbing layers 3 are laminated so that the above average transmittance and the above thickness are within the above ranges.

Further, the active light absorbing layer 3 can be subjected to a surface treatment (for example, a hard coat treatment), if necessary.
1-3. Method for Manufacturing Adhesive Sheet Next, a method for manufacturing the pressure-sensitive adhesive sheet 1 will be described with reference to FIG.

The method for manufacturing the pressure-sensitive adhesive sheet 1 includes a pressure-sensitive adhesive layer preparation step for preparing the pressure-sensitive adhesive layer 2 and an arrangement step for arranging the active light absorbing layer 3 on one surface of the pressure-sensitive adhesive layer 2.

In the adhesive layer preparation step, the adhesive layer 2 is prepared as shown in FIG. 2A.

To prepare the adhesive layer 2, first, the release film 5 is prepared.

Examples of the release film 5 include flexible plastic films such as polyethylene, polypropylene, polyethylene terephthalate, and polyester film.

The thickness of the release film 5 is, for example, 3 μm or more, preferably 10 μm or more, and for example, 200 μm or less, preferably 100 μm or less, more preferably 50 μm or less.

The release film 5 is preferably subjected to a mold release treatment with a mold release agent such as silicone-based, fluorine-based, long-chain alkyl-based, or fatty acid amide-based, or a mold release treatment with silica powder.

Next, the adhesive composition (solution of the adhesive composition) is applied to one surface of the release film 5, and the solvent is dried and removed if necessary.

Examples of the method of applying the adhesive composition include roll coat, kiss roll coat, gravure coat, reverse coat, roll brush, spray coat, dip roll coat, bar coat, knife coat, air knife coat, curtain coat and lip coat. , Die coat, etc.

As the drying conditions, the drying temperature is, for example, 50 ° C. or higher, preferably 70 ° C. or higher, more preferably 100 ° C. or higher, and for example, 200 ° C. or lower, preferably 180 ° C. or lower, more preferably. It is 150 ° C. or less, and the drying time is, for example, 5 seconds or more, preferably 10 seconds or more, and for example, 20 minutes or less, preferably 15 minutes or less, more preferably 10 minutes or less.

As a result, the adhesive layer 2 is arranged (prepared) on one surface of the release film 5.

When the adhesive composition contains a cross-linking agent, it is preferable to remove it at the same time as drying or after drying the solvent (if necessary, after laminating the release film 5 on one surface of the adhesive layer 2). , Crosslinking proceeds by aging.

The aging conditions are appropriately set depending on the type of the cross-linking agent, the aging temperature is, for example, 20 ° C. or higher, and the aging temperature is, for example, 160 ° C. or lower, preferably 50 ° C. or lower, and the aging time is 1 minute. The above is preferably 12 hours or more, more preferably 1 day or more, and for example, 7 days or less.

In the arranging step, as shown in FIG. 2B, the active light absorbing layer 3 is arranged on one surface of the adhesive layer 2.

Then, if necessary, the release film 5 is peeled off.

As a result, the adhesive sheet 1 provided with the adhesive layer 2 and the active light absorbing layer 3 arranged on one surface of the adhesive layer 2 can be obtained. When the release film 5 is not peeled off, the release film 5, the adhesive layer 2 arranged on one surface of the release film 5, and the active light absorbing layer 3 arranged on one surface of the adhesive layer 2 are provided. The adhesive sheet 1 is obtained.

Further, in the above description, the adhesive layer 2 is arranged on one surface of the release film 5, but from the viewpoint of handleability, the adhesive layer 2 can be arranged on one surface of the transparent base material. ..

The transparent substrate has a film shape extending in the plane direction, and has a flat flat surface and a flat lower surface.

The transparent substrate is made of a flexible plastic material.

Such plastic materials include, for example, polyester resins such as polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, and (meth) acrylic resins (acrylic resin and / or methacrylic resin) such as polymethacrylate, for example. , Polyethylene resins such as polyethylene, polypropylene, cycloolefin polymer (COP), eg polycarbonate resins, eg polyether sulfone resins, eg polyarylate resins, eg melamine resins, eg polyamide resins, eg polyimide resins, eg , Cellulous resin, for example, polystyrene resin, for example, synthetic resin of norbornen resin and the like.

When the adhesive layer 2 is colored by irradiating the adhesive layer 2 with active light (preferably ultraviolet rays) from the transparent base material side, the base material 5 preferably has transparency to light. Specifically, the total light transmittance (JIS K 7375-2008) of the transparent substrate is, for example, 80% or more, preferably 85% or more.

From the viewpoint of achieving both transparency to light and mechanical strength, a polyester resin is preferable, and polyethylene terephthalate (PET) is more preferable as a plastic material.

The thickness of the transparent substrate is, for example, 4 μm or more, preferably 20 μm or more, more preferably 30 μm or more, still more preferably 45 μm or more, and for example, 500 μm or less, from the viewpoint of flexibility and handleability. It is preferably 300 μm or less, more preferably 200 μm or less, and even more preferably 100 μm or less.

In order to arrange the adhesive layer 2 on one surface of the transparent substrate, the adhesive composition (solution of the adhesive composition) is applied to one surface of the transparent substrate in the same manner as described above, and a solvent is required. To dry and remove.

Then, the pressure-sensitive adhesive sheet 1 can be irradiated with active light rays (preferably ultraviolet rays) at the time of manufacturing the intermediate laminate 6 described later or before manufacturing the intermediate laminate 6 described later.

When the adhesive layer 2 is irradiated with active rays (preferably ultraviolet rays) during the production of the intermediate laminate 6, specifically, after the placement step, the adhesive layer 2 is irradiated with active rays (preferably ultraviolet rays).

Specifically, in the irradiation step in the method for producing the intermediate laminate 6 described later, active light rays (preferably ultraviolet rays) are irradiated.

Further, when the adhesive layer 2 is irradiated with active light rays (preferably ultraviolet rays) before the production of the intermediate laminate 6 described later, specifically, the activity is activated after the adhesive layer preparation step and before the placement step. Irradiate with light rays (preferably ultraviolet rays).

The case of irradiating with active light rays (preferably ultraviolet rays) after the adhesive layer preparation step and before the placement step will be described with reference to FIG.

In the adhesive layer preparation step, as shown in FIG. 3A, the adhesive layer 2 is prepared on one surface of the release film 5 in the same manner as in the above method.

Next, after the pressure-sensitive adhesive layer preparation step, as shown in FIG. 3B, the entire pressure-sensitive adhesive layer 2 is irradiated with active light rays (preferably ultraviolet rays) from the surface side of the release film 5.

Next, in the arranging step, as shown in FIG. 3C, the active light absorbing layer 3 is arranged on one surface of the adhesive layer 2.

According to this method, the entire adhesive layer 2 can be discolored in advance, and the colored portion can be prevented from being further colored by external light (active light).

Further, in the above description, the active light absorbing layer 3 is arranged on one surface of the adhesive layer 2 in the arrangement step, but as shown in FIG. 3D, the release film 5 (transparent base material) on the other surface of the adhesive layer 2 is arranged. When the adhesive layer 2 is prepared on one surface, the transparent base material) may be replaced with the active light absorbing layer 3.

Further, in the above description, the entire adhesive layer 2 is discolored, but a part of the adhesive layer 2 can also be discolored.

In such a case, as shown in FIG. 3E, it is arranged on the other surface of the portion 51 (specifically, the portion 51 irradiated with the active ray (preferably ultraviolet ray)) irradiated with the active ray (preferably ultraviolet ray). A mask 7 that blocks active rays (preferably ultraviolet rays) is not arranged on the other surface of the release film 5 and is not irradiated with active rays (preferably ultraviolet rays) 52 (specifically, active rays (preferably ultraviolet rays)). Is arranged from the surface side of the release film 5 by arranging a mask 7 for blocking active rays (preferably ultraviolet rays) on the other surface of the release film 5 arranged on the other surface of the portion 52 not irradiated with ultraviolet rays. Irradiate with active light (preferably ultraviolet light).

Then, in the arranging step, as shown in FIG. 3F, the active light absorbing layer 3 is arranged on one surface of the adhesive layer 2.

As a result, a part of the adhesive layer 2 can be discolored in advance, and it is possible to prevent the portion other than the colored portion from being colored by external light (active light).

Further, even in such a case, the release film 5 on the other side of the adhesive layer 2 (transparent base material when the adhesive layer 2 is prepared on one side of the transparent base material) can be replaced with the active light absorbing layer 3. it can.

Specifically, as shown in FIG. 3G, the entire release film 5 can be replaced with the active light absorbing layer 3, and as shown in FIG. 3H, it is not irradiated with active light (preferably ultraviolet rays). Only the release film 5 (transparent base material when the adhesive layer 2 is prepared on one side of the transparent base material) arranged on the other side of the portion 52 can be replaced with the active light absorbing layer 3.

Further, in the above description, the pressure-sensitive adhesive sheet 1 is composed of the pressure-sensitive adhesive layer 2 and the active light-absorbing layer 3, but between the pressure-sensitive adhesive layer 2 and the active light-absorbing layer 3, an intermediate layer such as the transparent substrate described above Can also be intervened.
2. 2. Intermediate Laminated Body As shown in FIG. 4, the intermediate laminated body 6 has a film shape (including a sheet shape) having a predetermined thickness, extends in a direction orthogonal to the thickness direction (plane direction), and has a flat upper surface and a flat upper surface. It has a flat lower surface.

Specifically, the intermediate laminate 6 includes an adhesive sheet 1 having an active light absorbing layer 3 arranged on one surface of the adhesive layer 2 and the adhesive layer 2, and the other surface of the adhesive sheet 1 (other than the adhesive layer 2). It is provided with an adherend 4 arranged in the direction).

As will be described in detail later, the intermediate laminate 6 can be obtained by attaching the above-mentioned adhesive sheet 1 to the adherend 4.

Since the intermediate laminate 6 includes the active light absorbing layer 3, it is possible to prevent the non-irradiated / low-irradiated portion 21 (described later) in the adhesive layer 2 from being colored by external light (active light).
2-1. Adhesive sheet As described above, the adhesive sheet 1 includes an adhesive layer 2 and an active light absorbing layer 3 arranged on one surface of the adhesive layer 2.

Further, as described above, the pressure-sensitive adhesive sheet 1 may have the release film 5 laminated on the other surface of the pressure-sensitive adhesive layer 2, if necessary.

In such a case, the pressure-sensitive adhesive sheet 1 includes a release film 5, a pressure-sensitive adhesive layer 2, and an active light absorbing layer 3 in this order.

In the following description, the case where the pressure-sensitive adhesive sheet 1 provided with the release film 5 is used will be described in detail.

Further, the adhesive layer 2 in the adhesive sheet 1 has a high light transmittance portion 10 having a relatively large visible light transmittance at a wavelength of 550 nm and a low light transmittance portion 11 having a relatively small visible light transmittance at a wavelength of 550 nm. And.

As will be described in detail later, the visible light transmittance of the high light transmittance portion 10 and the low light transmittance portion 11 at a wavelength of 550 nm is determined by the method for manufacturing the intermediate laminate 6 described later.
2-2. The adherend The adherend 4 is a body to be reinforced by the adhesive sheet 1, and examples thereof include an optical device, an electronic device, and its components.

In FIG. 4, the adherend 4 has a flat plate shape, but the shape of the adherend 4 is not particularly limited, and various shapes are selected depending on the types of optical devices, electronic devices, and structural parts thereof. To.

Further, as will be described in detail later, in the method of manufacturing the intermediate laminate 6, when the adhesive layer 2 is irradiated with active rays (preferably ultraviolet rays) from the surface side of the adherend 4, (the second A embodiment described later). The method for producing the intermediate laminate 6 is determined by whether the adherend 4 transmits the active light rays (preferably ultraviolet rays) or blocks the active rays (preferably ultraviolet rays).

Among such adherends 4, the adherend 4 that transmits active light rays (hereinafter referred to as the first adherend 30) is preferably the first adherend 30 that transmits ultraviolet rays. Be done.

Examples of the first adherend 30 that transmits ultraviolet rays include non-alkali glass and PET film.

The average transmittance of the active light of the first adherend 30 that transmits the active light is, for example, 60% or more, preferably 65% or more, and in particular, the first adherend that transmits the active light. When 30 is the first adherend 30 that transmits ultraviolet rays, the average transmittance of the first adherend 30 that transmits ultraviolet rays at a wavelength of 300 nm or more and 400 nm or less is, for example, 60% or more, preferably 60% or more. , 65% or more.

When the above-mentioned average transmittance is equal to or higher than the above-mentioned lower limit, the active light rays (preferably ultraviolet rays) may pass through the first adherend 30 and irradiate the adhesive layer 2 with the active rays (preferably ultraviolet rays). it can.

Further, among such adherends 4, the adherend 4 (hereinafter, referred to as a second adherend 31) that blocks active rays (preferably ultraviolet rays) is a second that absorbs active rays. Examples thereof include an adherend 31 and a second adherend 31 that reflects active rays (does not transmit active rays).

As the second adherend 31 that absorbs the active light beam, preferably, the second adherend 31 that absorbs ultraviolet rays can be mentioned.

Examples of the second adherend 31 that absorbs ultraviolet rays include a polyimide film and a glass plate coated with the above-mentioned ultraviolet absorber.

The average transmittance of the active light of the second adherend 31 that absorbs the active light is, for example, 15% or less, preferably 10% or less, and in particular, the second adherend that absorbs the active light. When 31 is the second adherend 31 that absorbs ultraviolet rays, the average transmittance of the second adherend 31 that absorbs ultraviolet rays at a wavelength of 300 nm or more and 400 nm or less is, for example, 15% or less, preferably 15% or less. It is 10% or less.

When the above-mentioned average transmittance is equal to or more than the above-mentioned lower limit, the second adherend 31 can absorb active light rays (preferably ultraviolet rays).

The second adherend 31 that reflects the active light beam is preferably a second adherend 31 that reflects ultraviolet rays.

Examples of the second adherend 31 that reflects ultraviolet rays include a metal substrate such as a copper plate.
2-3. Method for manufacturing the intermediate laminate 6 The method for producing the intermediate laminate 6 is a preparatory step for preparing the adhesive sheet 1 described above, in which the adhesive layer 2 is irradiated with active light (preferably ultraviolet rays), and the adhesive layer 2 is relatively relative to the adhesive layer 2. The high irradiation portion 20 having a high irradiation amount of active light (preferably ultraviolet rays) and the non-irradiated portion 20 having a relatively low irradiation amount of active light (preferably ultraviolet rays) or not being irradiated with active rays (preferably ultraviolet rays). An irradiation step in which the visible light transmission of the high irradiation portion 20 at a wavelength of 550 nm is made smaller than the visible light transmission of the non-irradiation / low irradiation portion 21 at a wavelength of 550 nm by forming the irradiation / low irradiation portion 21. , And a sticking step of sticking the other surface of the adhesive sheet 1 to the adherend 4.

That is, since the pressure-sensitive adhesive sheet 1 is used in the method for manufacturing the intermediate laminate 6, the intermediate laminate 6 obtained by the method for producing the intermediate laminate 6 is other than the colored portion (non-irradiated / low-irradiated portion 21). However, it is possible to suppress coloring by external light (active light).

Hereinafter, the method for producing the intermediate laminate 6 will be described separately for each step sequence and irradiation direction of active light (preferably ultraviolet rays).

Specifically, as the order of each step, the irradiation step is carried out after the preparation step, and the attachment step is carried out after the irradiation step (hereinafter, referred to as the first embodiment), or the preparation step. Later, a sticking step is carried out, and after the sticking step, an irradiation step is carried out (hereinafter, referred to as a second embodiment).

Further, as for the irradiation direction of the active light rays (preferably ultraviolet rays), in the first embodiment, the active light rays (preferably ultraviolet rays) are applied from the surface side of the release film 5 (the surface side of the adhesive layer 2) to the adhesive layer 2. (Hereinafter referred to as the first A embodiment), or the pressure-sensitive adhesive layer 2 is irradiated with active rays (preferably ultraviolet rays) from the surface side of the active light absorbing layer 3 (hereinafter referred to as the first B embodiment). .). Further, in the second embodiment, the adhesive layer 2 is irradiated with active light rays (preferably ultraviolet rays) from the surface side of the adherend 4 (hereinafter referred to as the second A embodiment), or the active light rays are absorbed. The adhesive layer 2 is irradiated with active light rays (preferably ultraviolet rays) from the surface side of the layer 3 (hereinafter referred to as the second B embodiment).

Hereinafter, each embodiment will be described in detail.

In the method for producing the intermediate laminate 6, the non-irradiated / low-irradiated portion 21 becomes the non-irradiated portion 22 or the low-irradiated portion 23 depending on the irradiation amount of the active light (preferably ultraviolet rays). However, in the following description, the case where the non-irradiated / low-irradiated portion 21 is the non-irradiated portion 22 will be described in detail.

Further, the non-irradiated portion 22 is a portion not irradiated with active light rays (preferably ultraviolet rays), and the visible light transmittance of the non-irradiated portion 22 at a wavelength of 550 nm is, for example, 80% or more, preferably 90. % Or more.

If the visible light transmittance is equal to or higher than the lower limit, the non-irradiated portion 22 has transparency.
2-3-1. 1A Embodiment In the 1A embodiment, the irradiation step is carried out after the preparation step, and the attachment step is carried out after the irradiation step.

Further, in the first A embodiment, in the irradiation step, the adhesive layer 2 is irradiated with active light rays (preferably ultraviolet rays) from the surface side of the adhesive layer 2.

The first A embodiment will be described with reference to FIG.

In the preparation step, the adhesive sheet 1 is prepared as shown in FIG. 5A.

In the irradiation step, as shown in FIG. 5B, the adhesive layer 2 is irradiated with active rays (preferably ultraviolet rays), and the adhesive layer 2 is irradiated with relatively active rays (preferably ultraviolet rays). An irradiated portion 20 and a non-irradiated portion 22 that is not irradiated with active light (preferably ultraviolet rays) are formed.

In the following description, when a part of the adhesive sheet 1 (adhesive layer 2) is irradiated with active light rays (preferably ultraviolet rays), specifically, both ends of the adhesive sheet 1 divided into three in the plane direction. A part of the pressure-sensitive adhesive sheet 1 (adhesive layer 2) that irradiates two parts of the portion with active light rays (preferably ultraviolet rays) and irradiates the active rays (preferably ultraviolet rays) with the highly irradiated portion 20 (in other words, ultraviolet rays). The non-irradiated portion 22) will be described as only one central portion of the adhesive sheet 1 divided into three in the plane direction.

Specifically, in the irradiation step, in the pressure-sensitive adhesive sheet 1, the highly irradiated portion 20 is irradiated with active light rays (preferably ultraviolet rays) from the surface side of the release film 5 (the surface side of the pressure-sensitive adhesive layer 2) and is not irradiated. The portion 22 is not irradiated with active light (preferably ultraviolet rays).

Specifically, the mask 7 that blocks active rays (preferably ultraviolet rays) is not arranged on the highly irradiated portion 20 (specifically, the other surface of the release film 5 arranged on the other surface of the highly irradiated portion 20). A mask 7 for blocking active light rays (preferably ultraviolet rays) is arranged on the non-irradiated portion 22 (specifically, the other surface of the release film 5 arranged on the other surface of the non-irradiated portion 22) to form the release film 5. Active light rays (preferably ultraviolet rays) are irradiated from the surface side (the surface side of the adhesive layer 2).

As a result, only the highly irradiated portion 20 is irradiated with active light rays (preferably ultraviolet rays).

Then, in the adhesive layer 2 in the highly irradiated portion 20, an acid is generated from the photoacid generator, and the acid causes the compound to be colored by the acid to be colored (specifically, black). As a result, the adhesive layer 2 in the highly irradiated portion 20 changes from colorless (transparent) to colored (the visible light transmittance at a wavelength of 550 nm becomes low). Then, the visible light transmittance of the highly irradiated portion 20 at a wavelength of 550 nm becomes smaller than the visible light transmittance of the non-irradiated portion 22 at a wavelength of 550 nm (specifically, the highly irradiated portion 20 is the non-irradiated portion 22). It becomes blacker than.).

That is, a high irradiation portion 20 having a relatively small visible light transmittance at a wavelength of 550 nm and a non-irradiation portion 22 having a relatively large visible light transmittance at a wavelength of 550 nm are formed.

Then, the high irradiation portion 20 becomes the low light transmittance portion 11, and the non-irradiation portion 22 becomes the high light transmittance portion 10.

In the sticking step, as shown in FIG. 5C, the other surface of the adhesive sheet 1 (the other surface of the adhesive layer 2) is attached to the adherend 4.

Specifically, the release film 5 is peeled off from the pressure-sensitive adhesive sheet 1, and the adherend 4 is arranged on the other surface of the pressure-sensitive adhesive sheet 1 (the other surface of the pressure-sensitive adhesive layer 2).

As a result, the adhesive sheet 1 having the active light absorbing layer 3 arranged on one surface of the adhesive layer 2 and the adhesive layer 2 and the adherend arranged on the other surface of the adhesive sheet 1 (the other surface of the adhesive layer 2). An intermediate laminated body 6 including the body 4 is obtained.

Further, in the intermediate laminate 6, the adhesive layer 2 has a high light transmittance portion 10 having a relatively large visible light transmittance at a wavelength of 550 nm and a low light transmittance having a relatively small visible light transmittance at a wavelength of 550 nm. It includes a portion 11.

In this intermediate laminate 6, the visible light transmittance of the low light transmittance portion 11 at a wavelength of 550 nm is, for example, less than 20%, preferably 10% or less, and for example, 0.01%. The visible light transmittance of the high light transmittance portion 10 at a wavelength of 550 nm is, for example, 80% or more, preferably 90% or more.

If the visible light transmittance of the low light transmittance portion 11 is less than the above upper limit, the function of absorbing light can be reliably imparted to the low light transmittance portion 11.

Further, if the visible light transmittance of the high light transmittance portion 10 is equal to or higher than the above lower limit, the high light transmittance portion 10 has transparency.

According to the first A embodiment, in addition to achieving the effect of the method for producing the intermediate laminate 6 described above, the irradiation step is carried out after the preparation step, and the attachment step is carried out after the irradiation step. It becomes easy to maintain the pattern shape of the formed regions having different transmittances even when exposed to external light.

Further, according to the first A embodiment, in the irradiation step, the adhesive layer 2 is irradiated with active light rays (preferably ultraviolet rays) from the surface side of the release film 5 (the surface side of the adhesive layer 2), so that the adhesive layer 2 is used. Can be reliably colored.

Further, in particular, if the adherend 4 is the second adherend 31, the non-irradiated portion 22 is colored by the external light (active light) from the surface side of the second adherend 31. Can be suppressed.
2-3-2. 1B Embodiment In the 1B embodiment, the irradiation step is carried out after the preparation step, and the attachment step is carried out after the irradiation step.

Further, in the first B embodiment, in the irradiation step, the adhesive layer 2 is irradiated with active rays (preferably ultraviolet rays) from the surface side of the active light absorbing layer 3.

Specifically, in the irradiation step, the active light absorbing layer 3 is irradiated with active light (preferably ultraviolet rays) having a light amount exceeding the absorption amount of the active light absorbing layer 3 from the surface side of the active light absorbing layer 3. Then, the adhesive layer 2 is discolored.

The first B embodiment will be described with reference to FIG.

In the preparation step, as shown in FIG. 6A, the adhesive sheet 1 is prepared in the same manner as in the first A embodiment described above.

In the irradiation step, as shown in FIG. 6B, the adhesive layer 2 is irradiated with active rays (preferably ultraviolet rays), and the adhesive layer 2 is irradiated with relatively high amounts of active rays (preferably ultraviolet rays). An irradiated portion 20 and a non-irradiated portion 22 that is not irradiated with active light (preferably ultraviolet rays) are formed.

Specifically, in the irradiation step, in the pressure-sensitive adhesive sheet 1, the high-irradiated portion 20 is exposed to active light (preferably ultraviolet rays) (the amount of light that exceeds the amount absorbed by the active light absorbing layer 3) from the active light absorbing layer 3 side. Light rays (preferably ultraviolet rays)) are irradiated, and the non-irradiated portion 22 is not irradiated with active rays (preferably ultraviolet rays).

Specifically, a mask 7 for blocking active rays (preferably ultraviolet rays) is arranged on the high irradiation portion 20 (specifically, one surface of the active light absorbing layer 3 arranged on one surface of the high irradiation portion 20). Instead, a mask 7 that blocks active rays (preferably ultraviolet rays) is placed on the non-irradiated portion 22 (specifically, one surface of the active light absorbing layer 3 arranged on one surface of the non-irradiated portion 22) and activated. Active light rays (preferably ultraviolet rays) (active light rays having an amount of light exceeding the absorption amount of the active light absorption layer 3 (preferably ultraviolet rays)) are irradiated from the surface side of the light absorption layer 3.

As a result, only the highly irradiated portion 20 is irradiated with active light (preferably ultraviolet rays), and the high irradiated portion 20 (low light transmittance portion 11) and the non-irradiated portion 22 are similarly irradiated to the first A embodiment described above. (High light transmittance portion 10) can be formed.

In the sticking step, as shown in FIG. 6C, the other surface of the adhesive sheet 1 (the other surface of the adhesive layer 2) is attached to the adherend 4 in the same manner as in the first A embodiment described above.

As a result, the adhesive sheet 1 having the active light absorbing layer 3 arranged on one surface of the adhesive layer 2 and the adhesive layer 2 and the adherend arranged on the other surface of the adhesive sheet 1 (the other surface of the adhesive layer 2). An intermediate laminated body 6 including the body 4 is obtained.

Further, in the intermediate laminate 6, the adhesive layer 2 has a high light transmittance portion 10 having a relatively large visible light transmittance at a wavelength of 550 nm and a low light transmittance having a relatively small visible light transmittance at a wavelength of 550 nm. It includes a portion 11.

In this intermediate laminate 6, the visible light transmittance of the low light transmittance portion 11 at a wavelength of 550 nm is, for example, less than 20%, preferably 10% or less, and for example, 0.01%. The visible light transmittance of the high light transmittance portion 10 at a wavelength of 550 nm is, for example, 80% or more, preferably 90% or more.

If the visible light transmittance of the low light transmittance portion 11 is less than the above upper limit, the function of absorbing light can be reliably imparted to the low light transmittance portion 11.

Further, if the visible light transmittance of the high light transmittance portion 10 is equal to or higher than the above lower limit, the high light transmittance portion 10 has transparency.

According to the first B embodiment, in order to achieve the effect of the above-mentioned manufacturing method of the intermediate laminate 6, the irradiation step is carried out after the preparation step, and the attachment step is carried out after the irradiation step, so that the irradiation step ( If a problem occurs in the bonding of the adhesive layer 2 and the active light absorbing layer 3), the next step (irradiation step) can be stopped in advance, and as a result, the efficiency is improved.

Further, according to the first B embodiment, in the irradiation step, the adhesive layer 2 is irradiated with active rays (preferably ultraviolet rays) from the surface side of the active light absorbing layer 3, so that the amount of light is applied to the active light absorbing layer 3. It is necessary to irradiate with a large amount of active light (preferably ultraviolet rays), which makes it easier to control the transmittance of the highly irradiated portion 20.

Further, in particular, if the adherend 4 is the second adherend 31, the non-irradiated portion 22 is colored by the external light (active light) from the surface side of the second adherend 31. Can be suppressed.
2-3-3. 2nd A Embodiment In the 2A embodiment, the sticking step is carried out after the preparation step, and the irradiation step is carried out after the sticking step.

Further, in the second A embodiment, in the irradiation step, the adhesive layer 2 is irradiated with active light rays (preferably ultraviolet rays) from the surface side of the adherend 4.

In the second A embodiment, depending on whether the adherend 4 transmits an active ray (preferably ultraviolet light) or blocks the active ray (preferably ultraviolet ray) (specifically, the adherend 4). Is the first adherend 30 or the second adherend 31), and the method for manufacturing the intermediate laminate 6 is determined.

Hereinafter, the case where the adherend 4 is the first adherend 30 and the case where the adherend 4 is the second adherend 31 will be described separately.

The second A embodiment when the adherend 4 is the first adherend 30 will be described with reference to FIG. 7.

In the preparation step, as shown in FIG. 7A, the adhesive sheet 1 is prepared in the same manner as in the first A embodiment described above.

In the sticking step, as shown in FIG. 7B, the other surface of the adhesive sheet 1 (the other surface of the adhesive layer 2) is attached to the first adherend 30 in the same manner as in the first A embodiment described above.

In the irradiation step, as shown in FIG. 7C, the adhesive layer 2 is irradiated with active rays (preferably ultraviolet rays), and the adhesive layer 2 is irradiated with relatively active rays (preferably ultraviolet rays). An irradiated portion 20 and a non-irradiated portion 22 that are not irradiated with active light (preferably ultraviolet rays) are formed.

Specifically, in the irradiation step, in the pressure-sensitive adhesive sheet 1, the highly irradiated portion 20 is irradiated with active rays (preferably ultraviolet rays) from the first adherend 30 side, and the non-irradiated portion 22 is irradiated with active rays. Do not irradiate (preferably ultraviolet rays).

Specifically, after arranging a mask 7 that blocks active rays (preferably ultraviolet rays) on a part of the other surface of the first adherend 30, the adhesive layer 2 is irradiated with active rays (preferably ultraviolet rays). ..

More specifically, the highly irradiated portion 20 (specifically, the other surface of the first adherend 30 arranged on the other surface of the highly irradiated portion 20) is provided with a mask 7 that blocks active rays (preferably ultraviolet rays). A mask 7 that blocks active light (preferably ultraviolet rays) is arranged on the non-irradiated portion 22 (specifically, the other surface of the first adherend 30 arranged on the other surface of the non-irradiated portion 22) without arranging. Then, active light rays (preferably ultraviolet rays) are irradiated from the surface side of the first adherend 30.

At this time, since the first adherend 30 transmits the active light rays (preferably ultraviolet rays), the active light rays (preferably ultraviolet rays) can be irradiated only to the highly irradiated portion 20.

As a result, the high irradiation portion 20 (low light transmittance portion 11) and the non-irradiation portion 22 (high light transmittance portion 10) can be formed as in the first A embodiment described above.

As described above, as shown in FIG. 7D, the adhesive sheet 1 having the active light absorbing layer 3 arranged on one surface of the adhesive layer 2 and the adhesive layer 2 and the other surface of the adhesive sheet 1 (the other surface of the adhesive layer 2). ), The intermediate laminated body 6 including the adherend 4 (first adherend 30) is obtained.

Further, in the intermediate laminate 6, the adhesive layer 2 has a high light transmittance portion 10 having a relatively large visible light transmittance at a wavelength of 550 nm and a low light transmittance having a relatively small visible light transmittance at a wavelength of 550 nm. It includes a portion 11.

In this intermediate laminate 6, the visible light transmittance of the low light transmittance portion 11 at a wavelength of 550 nm is, for example, less than 20%, preferably 10% or less, and for example, 0.01%. The visible light transmittance of the high light transmittance portion 10 at a wavelength of 550 nm is, for example, 80% or more, preferably 90% or more.

If the visible light transmittance of the low light transmittance portion 11 is less than the above upper limit, the function of absorbing light can be reliably imparted to the low light transmittance portion 11.

Further, if the visible light transmittance of the high light transmittance portion 10 is equal to or higher than the above lower limit, the high light transmittance portion 10 has transparency.

According to the second A embodiment (when the adherend 4 is the first adherend 30), the effect of the method for producing the intermediate laminate 6 described above is obtained, and the attachment step is carried out after the preparation step. Since the irradiation step is carried out after the sticking step, foreign matter and air bubbles can be confirmed during the sticking step.

Further, according to the second A embodiment (when the adherend 4 is the first adherend 30), in the irradiation step, the adhesive layer 2 is viewed from the surface side of the adherend 4 (first adherend 30). Is irradiated with active light rays (preferably ultraviolet rays), so that the accuracy of alignment of the portion to be colored is improved.

Further, according to the second A embodiment (when the adherend 4 is the first adherend 30), since the first adherend 4 is used, the adherend 4 (first adherend 30). The adhesive layer 2 can be reliably irradiated with active light rays (preferably ultraviolet rays) from the surface side of the surface.

Next, a second B embodiment in the case where the adherend 4 is the second adherend 31 will be described with reference to FIG.

In the preparation step, as shown in FIG. 8A, the adhesive sheet 1 is prepared in the same manner as in the first A embodiment described above.

In the sticking step, as shown in FIG. 8B, the second adherend 31 is arranged on a part of the other surface of the adhesive sheet 1 (a part of the other surface of the adhesive layer 2).

Specifically, the release film 5 is peeled off from the pressure-sensitive adhesive sheet 1, and the second adherend 31 is placed on a part of the other surface of the pressure-sensitive adhesive sheet 1 (a part of the other surface of the pressure-sensitive adhesive layer 2).

In the following description, as shown in FIG. 8B, a case where the second adherend 31 is arranged at one of the central portions of the adhesive sheet 1 divided into three in the plane direction will be described.

In the irradiation step, as shown in FIG. 8C, the adhesive layer 2 is irradiated with active rays (preferably ultraviolet rays), and the adhesive layer 2 is irradiated with relatively active rays (preferably ultraviolet rays). An irradiated portion 20 and a non-irradiated portion 22 that is not irradiated with active light (preferably ultraviolet rays) are formed.

Specifically, in the irradiation step, in the pressure-sensitive adhesive sheet 1, the highly irradiated portion 20 is irradiated with active light rays (preferably ultraviolet rays) from the surface side of the second adherend 31, and the non-irradiated portion 22 is subjected to. Do not irradiate with active light (preferably ultraviolet light).

Specifically, unlike the above-mentioned first A embodiment, first B embodiment and second A embodiment (when the adherend 4 is the first adherend 30), a mask that blocks active light rays (preferably ultraviolet rays). Active light rays (preferably ultraviolet rays) are irradiated from the surface side of the second adherend 31 as it is without using 7.

At this time, since the second adherend 31 blocks the active light rays (preferably ultraviolet rays), the second adherend 31 can be replaced with the mask 7 that blocks the active rays (preferably ultraviolet rays). 2 It is possible to prevent the non-irradiated portion 22 on which the adherend 31 is arranged from being irradiated with the active light beam (preferably ultraviolet rays), while the active ray is applied only to the highly irradiated portion 20 on which the second adherend 31 is not arranged. (Preferably, ultraviolet rays) can be irradiated.

As a result, the high irradiation portion 20 (low light transmittance portion 11) and the non-irradiation portion 22 (high light transmittance portion 10) can be formed as in the first A embodiment described above.

As described above, as shown in FIG. 8D, the adhesive sheet 1 having the active light absorbing layer 3 arranged on one surface of the adhesive layer 2 and the adhesive layer 2 and the other surface of the adhesive sheet 1 (the other surface of the adhesive layer 2). ), The intermediate laminated body 6 including the adherend 4 (second adherend 31) is obtained.

Further, in the intermediate laminate 6, the adhesive layer 2 has a high light transmittance portion 10 having a relatively large visible light transmittance at a wavelength of 550 nm and a low light transmittance having a relatively small visible light transmittance at a wavelength of 550 nm. It includes a portion 11.

In this intermediate laminate 6, the visible light transmittance of the low light transmittance portion 11 at a wavelength of 550 nm is, for example, less than 20%, preferably 10% or less, and for example, 0.01%. The visible light transmittance of the high light transmittance portion 10 at a wavelength of 550 nm is, for example, 80% or more, preferably 90% or more.

If the visible light transmittance of the low light transmittance portion 11 is less than the above upper limit, the function of absorbing light can be reliably imparted to the low light transmittance portion 11.

Further, if the visible light transmittance of the high light transmittance portion 10 is equal to or higher than the above lower limit, the high light transmittance portion 10 has transparency.

According to the second A embodiment (when the adherend 4 is the second adherend 31), the effect of the method for producing the intermediate laminate 6 described above is obtained, and the attachment step is carried out after the preparation step. Since the irradiation step is carried out after the sticking step, foreign matter and air bubbles can be confirmed during the sticking step.

Further, according to the second A embodiment (when the adherend 4 is the second adherend 31), in the irradiation step, the adhesive layer 2 is viewed from the surface side of the adherend 4 (second adherend 31). Is irradiated with active light rays (preferably ultraviolet rays), so that the accuracy of alignment of the portion to be colored is improved.

Further, according to the second A embodiment (when the adherend 4 is the second adherend 31), the portion where the second adherend 4 is arranged (non-irradiated portion 22) is surely exposed to the active light beam (when the adherend 4 is the second adherend 31). Preferably, it can be blocked from ultraviolet rays).
2-3-4. 2nd B Embodiment In the 2B embodiment, the sticking step is carried out after the preparation step, and the irradiation step is carried out after the sticking step.

Further, in the second B embodiment, in the irradiation step, the adhesive layer 2 is irradiated with active rays (preferably ultraviolet rays) from the active light absorbing layer 3 side.

Specifically, as in the first B embodiment, in the irradiation step, from the surface side of the active light absorbing layer 3 to the active light absorbing layer 3, the amount of active light exceeding the absorption amount of the active light absorbing layer 3 (preferably). Discolors the adhesive layer 2 by irradiating it with ultraviolet rays).

The second B embodiment will be described with reference to FIG.

In the preparation step, as shown in FIG. 9A, the adhesive sheet 1 is prepared in the same manner as in the first A embodiment described above.

In the sticking step, as shown in FIG. 9B, the other surface of the adhesive sheet 1 (the other surface of the adhesive layer 2) is attached to the adherend 4 in the same manner as in the first A embodiment described above.

In the irradiation step, as shown in FIG. 9C, the adhesive layer 2 is irradiated with active rays (preferably ultraviolet rays), and the adhesive layer 2 is irradiated with relatively active rays (preferably ultraviolet rays). An irradiated portion 20 and a non-irradiated portion 22 that are not irradiated with active light (preferably ultraviolet rays) are formed.

Specifically, in the irradiation step, in the pressure-sensitive adhesive sheet 1, the high-irradiated portion 20 is exposed to active rays (preferably ultraviolet rays) (amount of light exceeding the amount absorbed by the active light absorbing layer 3) from the surface side of the active light absorbing layer 3. (Preferably ultraviolet rays)), and the non-irradiated portion 22 is not irradiated with active rays (preferably ultraviolet rays).

Specifically, a mask 7 for blocking active rays (preferably ultraviolet rays) is arranged on the high irradiation portion 20 (specifically, one surface of the active light absorbing layer 3 arranged on one surface of the high irradiation portion 20). Instead, a mask 7 that blocks active rays (preferably ultraviolet rays) is placed on the non-irradiated portion 22 (specifically, one surface of the active light absorbing layer 3 arranged on one surface of the non-irradiated portion 22) and activated. Active light rays (preferably ultraviolet rays) are irradiated from the surface side of the light absorption layer 3.

Thereby, the active light (preferably ultraviolet rays) can be irradiated only to the high irradiation portion 20, and the high irradiation portion 20 (low light transmittance portion 11) and the non-irradiation portion are not irradiated as in the first A embodiment described above. A portion 22 (high light transmittance portion 10) can be formed.

As described above, as shown in FIG. 9D, the adhesive sheet 1 provided with the active light absorbing layer 3 arranged on one surface of the adhesive layer 2 and the adhesive layer 2 and the other surface of the adhesive sheet 1 (the other surface of the adhesive layer 2). ), An intermediate laminate 6 including an adherend 4 is obtained.

Further, in the intermediate laminate 6, the adhesive layer 2 has a high light transmittance portion 10 having a relatively large visible light transmittance at a wavelength of 550 nm and a low light transmittance having a relatively small visible light transmittance at a wavelength of 550 nm. It includes a portion 11.

In this intermediate laminate 6, the visible light transmittance of the low light transmittance portion 11 at a wavelength of 550 nm is, for example, less than 20%, preferably 10% or less, and for example, 0.01%. The visible light transmittance of the high light transmittance portion 10 at a wavelength of 550 nm is, for example, 80% or more, preferably 90% or more.

If the visible light transmittance of the low light transmittance portion 11 is less than the above upper limit, the function of absorbing light can be reliably imparted to the low light transmittance portion 11.

Further, if the visible light transmittance of the high light transmittance portion 10 is equal to or higher than the above lower limit, the high light transmittance portion 10 has transparency.

According to the second B embodiment, the effect of the method for producing the intermediate laminate 6 described above is exhibited, and the sticking step is carried out after the preparatory step, and the irradiation step is carried out after the sticking step. Foreign matter and air bubbles can be confirmed during the process.

Further, according to the second B embodiment, in the irradiation step, the adhesive layer 2 is irradiated with active rays (preferably ultraviolet rays) from the surface side of the active light absorbing layer 3, so that the amount of light is applied to the active light absorbing layer 3. It is necessary to irradiate with a large amount of active light (preferably ultraviolet rays), which makes it easier to control the transmittance of the highly irradiated portion 20.

Further, in particular, if the adherend 4 is the second adherend 31, the non-irradiated portion 22 is colored by the external light (active light) from the surface side of the second adherend 31. Can be suppressed.
2-3-5. Modified Example In the above description, the case where the non-irradiated / low-irradiated portion 21 is the non-irradiated portion 22 has been described, but in the following description, the non-irradiated / low-irradiated portion 21 may be the low-irradiated portion 23. it can.

When the non-irradiated / low-irradiated portion 21 is the low-irradiated portion 23, in the irradiation step, after arranging the first mask 8 that blocks the active light (preferably ultraviolet rays), the active light (preferably ultraviolet) is placed on the adhesive layer 2. By irradiating the adhesive layer 2 (preferably ultraviolet rays), the first irradiated portion 40 irradiated with active rays (preferably ultraviolet rays) and the temporary non-irradiated portion 40 not irradiated with active rays (preferably ultraviolet rays). After arranging the first irradiation step of forming the irradiation portion 41 and the second mask 9 for blocking active light (preferably ultraviolet rays) in the first irradiation portion 40, the temporary non-irradiation portion 41 in the adhesive layer 2 is covered. It includes a second irradiation step of turning the temporary non-irradiated portion 41 into a second irradiated portion 42 by irradiating with active light (preferably ultraviolet rays).

Then, as will be described in detail later, since the irradiation amount of the active light (preferably ultraviolet rays) in the first irradiation step and the irradiation amount of the active rays (preferably ultraviolet rays) in the second irradiation step are different, the first irradiation One of the portion 40 and the second irradiation portion 42 becomes the high irradiation portion 20, and the other becomes the low irradiation portion 23.

In the following description, in the first A embodiment, when the non-irradiated / low-irradiated portion 21 is the low-irradiated portion 23 (hereinafter, referred to as a first modification of the first A embodiment), refer to FIG. I will explain.

In the preparation step, as shown in FIG. 10A, the adhesive sheet 1 is prepared in the same manner as in the first A embodiment described above.

In the irradiation step, the adhesive layer 2 is irradiated with active light rays (preferably ultraviolet rays), and the adhesive layer 2 is relative to the highly irradiated portion 20 having a relatively high irradiation amount of active rays (preferably ultraviolet rays). A low irradiation portion 23 having a low irradiation amount of active light (preferably ultraviolet rays) is formed on the surface.

Specifically, in the first irradiation step in the irradiation step, the first irradiation portion 40 and the temporary non-irradiation portion 41 are formed, and in the second irradiation step in the irradiation step, the temporary non-irradiation portion 41 is formed by the second irradiation portion. Set to 42.

In the first irradiation step, as shown in FIG. 10B, the first irradiation portion 40 is irradiated with active light rays (preferably ultraviolet rays) from the surface side of the release film 5 (the surface side of the adhesive layer 2) to temporarily and non-irradiate. The irradiated portion 41 is not irradiated with active light rays (preferably ultraviolet rays).

In the following description, the first irradiation portion 40 (in other words, the central portion of the adhesive sheet 1 divided into three parts in the surface direction) is divided into two parts at both ends of the adhesive sheet 1 divided into three parts in the surface direction. Only one place will be described as a temporary non-irradiated part 41).

More specifically, the first irradiation portion 40 (specifically, the other surface of the release film 5 arranged on the other surface of the first irradiation portion 40) has a first mask 8 that blocks active rays (preferably ultraviolet rays). The first mask 8 that blocks active light rays (preferably ultraviolet rays) on the temporary non-irradiated portion 41 (specifically, the other surface of the release film 5 arranged on the other surface of the temporary non-irradiated portion 41). Is arranged, and active light rays (preferably ultraviolet rays) are irradiated from the surface side of the adhesive layer 2.

Thereby, the active light beam (preferably ultraviolet light) can be irradiated only to the first irradiation portion 40.

Then, in the adhesive layer 2 in the first irradiation portion 40, an acid is generated from the photoacid generator, and the acid causes the compound to be colored by the acid to be colored (specifically, black). As a result, the adhesive layer 2 in the first irradiated portion 40 changes from colorless (transparent) to colored (the visible light transmittance at a wavelength of 550 nm becomes low).

Next, in the second irradiation step, the temporary non-irradiation portion 41 is changed to the second irradiation portion 42.

Specifically, in the second irradiation step, the temporary non-irradiated portion 41 is irradiated with active light (preferably ultraviolet rays) having a light amount different from that in the first irradiation step from the surface side of the adhesive layer 2, while the first irradiated portion. No. 40 is not irradiated with active light (preferably ultraviolet rays).

More specifically, the temporary non-irradiated portion 41 (specifically, the other surface of the release film 5 arranged on the other surface of the temporary non-irradiated portion 41) has a second mask 9 that blocks active rays (preferably ultraviolet rays). The second mask 9 that blocks active light rays (preferably ultraviolet rays) on the first irradiation portion 40 (specifically, the other surface of the release film 5 arranged on the other surface of the first irradiation portion 40) without arranging. Is arranged, and active light rays (preferably ultraviolet rays) are irradiated from the surface side of the adhesive layer 2.

As a result, the temporary non-irradiated portion 41 can be irradiated with active light rays (preferably ultraviolet rays), and the temporary non-irradiated portion 41 becomes the second irradiated portion 42.

Then, in the adhesive layer 2 of the second irradiated portion 42, an acid is generated from the photoacid generator, and the acid causes the compound to be colored by the acid to be colored (specifically, black). As a result, the adhesive layer 2 in the second irradiated portion 42 changes from colorless (transparent) to colored (the visible light transmittance at a wavelength of 550 nm becomes low).

As a result, the first irradiation portion 40 and the second irradiation portion 42 are formed on the adhesive layer 2.

Then, as described above, in the second irradiation step, the active light rays (preferably ultraviolet rays) having a light amount different from that in the first irradiation step are irradiated.

That is, the irradiation amounts of the active light rays (preferably ultraviolet rays) of the first irradiation portion 40 and the second irradiation portion 42 are different from each other.

Therefore, one of the first irradiation portion 40 and the second irradiation portion 42 has a relatively high irradiation amount of active light (preferably ultraviolet rays) of the high irradiation portion 20 (in other words, the wavelength is relatively 550 nm). The low light transmittance portion 11) has a low visible light transmittance, while the low irradiation portion 23 (in other words, a relatively wavelength of 550 nm) has a relatively low irradiation amount of active light (preferably ultraviolet rays). This is a high light transmittance portion 10) having a high visible light transmittance.

In FIG. 10, it is assumed that the first irradiation portion 40 is the high irradiation portion 20 (low light transmittance portion 11) and the second irradiation portion 42 is the low irradiation portion 21 (high light transmittance portion 10). ,explain.

Specifically, the visible light transmittance of the high irradiation portion 20 at a wavelength of 550 nm is, for example, less than 20%, preferably 10% or less, and for example, 0.01% or more, and the low irradiation portion 23. The visible light transmittance at a wavelength of 550 nm is, for example, 20% or more, preferably 40% or more, and for example, 70% or less.

Then, in the attachment step, as shown in FIG. 10D, the other surface of the adhesive sheet 1 (the other surface of the adhesive layer 2) is attached to the adherend 4 in the same manner as in the first A embodiment described above.

As a result, the adhesive sheet 1 having the active light absorbing layer 3 arranged on one surface of the adhesive layer 2 and the adhesive layer 2 and the adherend arranged on the other surface of the adhesive sheet 1 (the other surface of the adhesive layer 2). An intermediate laminated body 6 including the body 4 is obtained.

Further, in the intermediate laminate 6, the adhesive layer 2 has a high light transmittance portion 10 having a relatively large visible light transmittance at a wavelength of 550 nm and a low light transmittance having a relatively small visible light transmittance at a wavelength of 550 nm. It includes a portion 11.

In this intermediate laminate 6, the visible light transmittance of the low light transmittance portion 11 at a wavelength of 550 nm is, for example, less than 20%, preferably 10% or less, and for example, 0.01% or more. The visible light transmittance of the high light transmittance portion 10 at a wavelength of 550 nm is, for example, 20% or more, preferably 40% or more, and is, for example, 70% or less.

If the above-mentioned visible light transmittance of the low light transmittance portion 11 is within the above range and the above-mentioned visible light transmittance of the high light transmittance portion 10 is within the above range, the light transmittance portion 11 and The color of the high light transmittance portion 10 can be reliably changed.

According to the first modification of the first A embodiment, the effect of the method for producing the intermediate laminate 6 described above is obtained, and the high irradiation portion 20 (low light transmittance portion 11) is obtained by the first irradiation step and the second irradiation step. ) And the low irradiation portion 23 (high light transmittance portion 10), it is possible to manufacture the intermediate laminate 6 including the adhesive layer 2 having regions having different colors.

Further, in particular, if the adherend 4 is the second adherend 31, the low irradiation portion 23 is colored by the external light (active light) from the surface side of the second adherend 31. Can be suppressed.

When the non-irradiated / low-irradiated portion 21 is the low-irradiated portion 23, the irradiation step is to irradiate the entire adhesive layer 2 with active light (preferably ultraviolet rays), thereby irradiating the entire adhesive layer 2. A third irradiation step in which the third irradiation portion 43 irradiated with the active light (preferably ultraviolet rays) and a mask for blocking the active rays (preferably ultraviolet rays) on a part 45 of the third irradiation portion 43. After arranging 7, the remaining portion 46 of the third irradiation portion is irradiated with active light (preferably ultraviolet rays) to make the remaining portion 46 of the third irradiation portion 43 into the fourth irradiation portion 44. To be equipped.

In the following description, in the first A embodiment, when the non-irradiated / low-irradiated portion 21 is the low-irradiated portion 23 (hereinafter, referred to as a second modification of the first A embodiment), refer to FIG. I will explain.

In the preparation step, as shown in FIG. 11A, the adhesive sheet 1 is prepared in the same manner as in the first A embodiment described above.

In the irradiation step, the adhesive layer 2 is irradiated with active light rays (preferably ultraviolet rays), and the adhesive layer 2 is relative to the highly irradiated portion 20 having a relatively high irradiation amount of active rays (preferably ultraviolet rays). A low irradiation portion 23 having a low irradiation amount of active light (preferably ultraviolet rays) is formed on the surface.

Specifically, in the third irradiation step in the irradiation step, the third irradiation portion 43 is formed, and in the fourth irradiation step in the irradiation step, the remaining portion 46 (described later) of the third irradiation portion 43 is replaced with the fourth irradiation portion 44. To.

In the third irradiation step, as shown in FIG. 11B, the entire adhesive layer 2 is irradiated with active light rays (preferably ultraviolet rays) from the surface side of the release film 5 (the surface side of the adhesive layer 2).

As a result, the entire adhesive layer 2 becomes the third irradiation portion 43.

Further, in the adhesive layer 2 (third irradiation portion 43), an acid is generated from the photoacid generator, and the acid causes the compound to be colored by the acid to be colored (specifically, black). As a result, the entire adhesive layer 2 (third irradiation portion 43) changes from colorless (transparent) to colored (visible light transmittance at a wavelength of 550 nm becomes low).

Next, in the fourth irradiation step, as shown in FIG. 11C, after arranging a mask 7 for blocking active rays (preferably ultraviolet rays) on a part 45 of the third irradiation portion 43, the rest of the third irradiation portion. By irradiating 46 with an active ray (preferably ultraviolet rays), the remaining portion 46 of the third irradiation portion 43 becomes the fourth irradiation portion 44.

In the following description, the adhesive sheet 1 is divided into three parts in the surface direction, and the two portions at both ends are the remaining portion 46 of the third irradiation portion 43 (in other words, the adhesive sheet 1 is divided into three parts in the surface direction. Only one central portion will be described as a part 45) of the third irradiation portion 43.

Specifically, in the fourth irradiation step, the remaining portion 46 of the third irradiation portion 43 is irradiated with active light rays (preferably ultraviolet rays) from the surface side of the adhesive layer 2, while the remaining portion of the third irradiation portion 43 is irradiated. Do not irradiate with active light (preferably ultraviolet light).

More specifically, active light rays (preferably ultraviolet rays) are applied to the remaining portion 46 of the third irradiation portion 43 (specifically, the other surface of the release film 5 arranged on the other surface of the remaining portion 46 of the third irradiation portion 43). The active light beam (specifically, the other surface of the release film 5 arranged on the other surface of the part 45 of the third irradiation portion 43) without arranging the mask 7 for blocking Preferably, a mask 7 that blocks ultraviolet rays) is arranged, and active rays (preferably ultraviolet rays) are irradiated from the surface side of the adhesive layer 2.

As a result, only the remaining portion 46 of the third irradiation portion 43 can be irradiated with the active light beam (preferably ultraviolet rays), and the remaining portion 46 of the third irradiation portion 43 becomes the fourth irradiation portion 44.

Then, in the adhesive layer 2 in the fourth irradiation portion 44, an acid is generated from the photoacid generator, and the acid causes the compound to be colored by the acid to be colored (specifically, black). As a result, the adhesive layer 2 in the fourth irradiated portion 44 changes from colorless (transparent) to colored (the visible light transmittance at a wavelength of 550 nm becomes low).

As a result, the fourth irradiated portion 44 has a lower visible light transmittance at a wavelength of 550 nm than the third irradiated portion 43.

That is, the third irradiated portion 43 has a relatively low irradiation amount of active light (preferably ultraviolet rays) and a low irradiation portion 23 (in other words, a high light transmittance having a relatively high visible light transmittance at a wavelength of 550 nm). The fourth irradiated portion 44 becomes the portion 10), and the fourth irradiated portion 44 has a relatively high irradiation amount of active light (preferably ultraviolet rays) and a high irradiation portion 20 (in other words, a relatively low visible light transmittance at a wavelength of 550 nm). The low light transmittance portion 11).

Specifically, the visible light transmittance of the high irradiation portion 20 at a wavelength of 550 nm is, for example, less than 20%, preferably 10% or less, and for example, 0.01% or more, and the low irradiation portion 23. The visible light transmittance at a wavelength of 550 nm is, for example, 20% or more, preferably 40% or more, and for example, 70% or less.

Then, in the sticking step, as shown in FIG. 11D, the other surface of the adhesive sheet 1 (the other surface of the adhesive layer 2) is attached to the adherend 4 in the same manner as in the first A embodiment described above.

As a result, the adhesive sheet 1 having the active light absorbing layer 3 arranged on one surface of the adhesive layer 2 and the adhesive layer 2 and the adherend arranged on the other surface of the adhesive sheet 1 (the other surface of the adhesive layer 2). An intermediate laminated body 6 including the body 4 is obtained.

Further, in the intermediate laminate 6, the adhesive layer 2 has a high light transmittance portion 10 having a relatively large visible light transmittance at a wavelength of 550 nm and a low light transmittance having a relatively small visible light transmittance at a wavelength of 550 nm. It includes a portion 11.

In this intermediate laminate 6, the visible light transmittance of the low light transmittance portion 11 at a wavelength of 550 nm is, for example, less than 20%, preferably 10% or less, and for example, 0.01% or more. The visible light transmittance of the high light transmittance portion 10 at a wavelength of 550 nm is, for example, 20% or more, preferably 40% or more, and is, for example, 70% or less.

If the above-mentioned visible light transmittance of the low light transmittance portion 11 is within the above range and the above-mentioned visible light transmittance of the high light transmittance portion 10 is within the above range, the light transmittance portion 11 and The color of the high light transmittance portion 10 can be reliably changed.

According to the second modification of the first A embodiment, the effect of the method for producing the intermediate laminate 6 described above is exhibited, and the high irradiation portion 20 (low light transmittance portion 11) is obtained by the third irradiation step and the fourth irradiation step. ) And the low irradiation portion 23 (high light transmittance portion 10), it is possible to manufacture the intermediate laminate 6 including the adhesive layer 2 having regions having different colors.

Further, in particular, if the adherend 4 is the second adherend 31, the low irradiation portion 23 is colored by the external light (active light) from the surface side of the second adherend 31. Can be suppressed.

In the above description, in the first A embodiment, the case where the non-irradiated / low-irradiated portion 21 is the low-irradiated portion 23 has been described, but the first B embodiment and the second A embodiment (when the first adherend is used). ) And the second B embodiment, the non-irradiation / low irradiation portion 21 is referred to as the low irradiation portion 23 based on the same procedure as the irradiation step in the first modification or the second modification of the first A embodiment described above. can do.

Further, by using a plurality of masks 7 that block active rays (preferably ultraviolet rays), it is possible to obtain an intermediate laminate 6 in which the low light transmittance portion 11 of the adhesive layer 2 has a pattern shape.

Specifically, in the irradiation step of the first A embodiment, as shown in FIG. 12A, a mask 7 for blocking a plurality of active rays (preferably ultraviolet rays) is arranged on the other surface of the release film 5 (specifically, for details, Place four at a distance from each other).

Then, by carrying out the preparation step, the irradiation step and the sticking step in the same manner as in the first A embodiment described above, as shown in FIG. 12B, the low light transmittance portion 11 in the adhesive layer 2 has an intermediate pattern shape. The laminated body 6 can be obtained.

In the intermediate laminate 6, if the low light transmittance portion 11 has a pattern shape, the pattern shape can be freely designed.

Examples and comparative examples are shown below, and the present invention will be described in more detail. The present invention is not limited to Examples and Comparative Examples. In addition, specific numerical values such as the compounding ratio (content ratio), physical property values, and parameters used in the following description are the compounding ratios corresponding to those described in the above-mentioned "Form for carrying out the invention". Substitute the upper limit value (value defined as "less than or equal to" or "less than") or the lower limit value (value defined as "greater than or equal to" or "excess") such as content ratio), physical property value, and parameters. be able to.

In addition, "part" and "%" are based on mass unless otherwise specified.
1. 1. Details of Ingredients Each ingredient used in each Example and each Comparative Example is described below.
BA: Butyl acrylate AA: Tetrad C acrylate C: Trade name: 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane (epoxy-based cross-linking agent), Mitsubishi Gas Chemical BLACK ND1: leuco dye, Yamada Chemical Kogyo CPI-310B: sulfonium and _{(C 6 F 5) 4 B} - consisting of the salts, photoacid generator, Apro Kapton 200H: polyimide film, thickness 25 [mu] m, Toray Co. KC2UA: TAC film, thickness 25 [mu] m, UVA-TAC manufactured by Konica Minolta Co., Ltd .: Obtained by forming a hard coat layer (thickness: 7 μm) on one side of a film (KC2UA (thickness: 25 μm) by hard coat treatment) including KC2UA and a hard coat layer in order. ), Thickness 32 μm
UVA-TAC x 1: 1 UVA-TAC
UVA-TAC x 2: 2 UVA-TAC
UVA-TAC x 4: 4 UVA-TAC
UVA-TAC x 8: 8 UVA-TAC
UVA-OCA: Adhesive tape with UV absorption function, trade name "CS9934U", thickness 100 μm, manufactured by Nitto Denko Corporation 2. Preparation of adhesive polymer Synthesis Example 1
In a reaction vessel equipped with a thermometer, a stirrer, a reflux condenser and a nitrogen gas introduction tube, 95 parts by mass of butyl acrylate and 5 parts by mass of acrylic acid as monomer components, and 0.2 azobisisobutyronitrile as a polymerization initiator. 233 parts by mass of ethyl acetate was added as a solvent by mass, nitrogen gas was allowed to flow, and nitrogen was replaced for about 1 hour with stirring. Then, the mixture was heated to 60 ° C. and reacted for 7 hours to obtain a solution of a sticky polymer having a weight average molecular weight (Mw) of 600,000.
3. 3. Manufacture of Adhesive Sheet Example 1
BLACK as a cross-linking agent in the solution of the adhesive polymer of Synthesis Example 1 and 0.075 parts by mass of tetrad C with respect to 100 parts by mass of the adhesive polymer in the solution of the adhesive polymer. Adhesion of ND1 (leuco dye) to 100 parts by mass of the adhesive polymer in the solution of the adhesive polymer, 2 parts by mass, and CP-310B (photoacid generator) as the acid generator in the solution of the adhesive polymer To 100 parts by mass of the sex polymer, 10 parts by mass was added and mixed uniformly to prepare a tacky composition.

Next, the adhesive composition of Synthesis Example 1 was applied to one surface of a polyethylene terephthalate film having a thickness of 50 μm (hereinafter referred to as release film A) that had been surface-released so that the thickness after drying was 25 μm. Was coated with a fountain roll and dried at 130 ° C. for 1 minute to remove the solvent. As a result, an adhesive layer having the release film A on the other surface was formed. Further, a release-treated surface of a release film B (a polyethylene terephthalate film having a thickness of 25 μm with a silicone release-treated surface) was attached to one surface of the adhesive layer. Then, the aging treatment was carried out in an atmosphere of 25 ° C. for 4 days to allow the crosslinking reaction to proceed. As a result, the adhesive layer was manufactured (prepared).

Next, the release film B arranged on one surface of the pressure-sensitive adhesive layer is peeled off to obtain a glass substrate, a low pressure-sensitive adhesive layer made of a known pressure-sensitive adhesive, a PET film, and a high pressure-sensitive adhesive layer made of a known pressure-sensitive adhesive. Capton 200H as an ultraviolet absorbing layer was arranged in order on one surface of the adhesive layer.

The low adhesive layer has an adhesive force capable of peeling the glass substrate and the PET film.

Further, the average transmittance of ultraviolet rays of the low pressure-sensitive adhesive layer and the high pressure-sensitive adhesive layer is 50% or more.

As a result, an adhesive sheet including a release film A, an adhesive layer, a glass substrate, a low adhesive layer, a PET film, a high adhesive layer, and an ultraviolet absorbing layer (Kapton 200H) was obtained.

Example 2
An adhesive sheet was produced in the same manner as in Example 1 except that UVA-TAC × 1 was used as the ultraviolet absorbing layer.

Example 3
An adhesive sheet was produced in the same manner as in Example 1 except that UVA-TAC × 2 was used as the ultraviolet absorbing layer.

Example 4
An adhesive sheet was produced in the same manner as in Example 1 except that UVA-TAC × 4 was used as the ultraviolet absorbing layer.

Example 5
An adhesive sheet was produced in the same manner as in Example 1 except that UVA-TAC × 8 was used as the ultraviolet absorbing layer.

Example 6
An adhesive sheet was produced in the same manner as in Example 1 except that UVA-OCA was used as the ultraviolet absorbing layer.

Example 7
An adhesive sheet was produced in the same manner as in Example 1 except that UVA-TAC and UVA-OCA were used as the ultraviolet absorbing layer.

Specifically, an adhesive sheet including a release film A, an adhesive layer, a glass substrate, a low adhesive layer, a PET film, a high adhesive layer, UVA-TAC, and UVA-OCA is obtained in this order. It was.

Comparative Example 1
An adhesive sheet was produced in the same manner as in Example 1 except that a PET film (thickness 25 μm) was used as the ultraviolet absorbing layer.
4. Evaluation (Average transmittance of adhesive layer before LED irradiation)
The release film B arranged on one surface of the adhesive layer of Example 1 was peeled off, and one surface of the adhesive layer was attached to a glass substrate.

Then, the release film A arranged on the other surface of the adhesive layer was peeled off. As a result, a sample for measuring the average transmittance was prepared.

This sample for average transmittance is installed in a transmittance measuring device (U4100 spectrophotometer, manufactured by Nippon High Technologies Co., Ltd.) so that an adhesive layer is arranged on the light source side, and the average transmittance at a wavelength of 400 nm to 700 nm. Was measured.

The data measured only on the glass substrate was used as the baseline.

The results are shown in Table 1.

(Average transmittance of the adhesive layer after LED irradiation)
After irradiating the adhesive layer in the above sample for measuring the average transmittance with light of an LED (365 nm, 8000 mJ / □), the average transmittance at a wavelength of 400 nm to 700 nm was measured by the same method as described above.

The results are shown in Table 1.

(Average transmittance of UV absorbing layer)
Each ultraviolet absorbing layer was installed in a transmittance measuring device (U4100 spectrophotometer, manufactured by Nippon High Technologies Co., Ltd.), and the average transmittance at a wavelength of 300 nm to 400 nm and the average transmittance at a wavelength of 400 nm to 700 nm were measured.

The data measured with nothing installed in the measuring device was used as the baseline.

The results are shown in Table 1.

(External light stability)
The adhesive sheets of each example and each comparative example were left to stand so that the light of the fluorescent lamp was irradiated from the ultraviolet absorbing layer side of the adhesive sheets of each example and each comparative example.

Then, the average transmittance at a wavelength of 400 nm to 700 nm was measured at the start of leaving and after a certain period of time has passed from the start of leaving (24 hours, 48 hours, 120 hours, 144 hours).

Specifically, the low adhesive layer, the PET film, the high adhesive layer, and the ultraviolet absorbing layer arranged on one surface of the glass substrate are peeled off from the adhesive sheet, and the other surface of the adhesive layer is formed. The release film A to be arranged was peeled off.

As a result, a sample for measuring external light stability was prepared, which provided the adhesive layer and the glass substrate in this order.

Then, this sample for measuring external light stability is installed in a transmittance measuring device (U4100 spectrophotometer, manufactured by Nippon High Technologies Co., Ltd.) so that an adhesive layer is arranged on the light source side, and has a wavelength of 400 nm to 700 nm. The average transmittance was measured.

The data measured only on the glass substrate was used as the baseline.

In addition, the rate of change after each lapse of time was calculated by the following formula (1).
Rate of change after each time = (Average transmittance at the start of leaving-Average transmittance after each time) / (Average transmittance at the start of leaving) (1)
The results are shown in Table 2.
5. Discussion In the evaluation of the average transmittance, the adhesive sheet of Example 1 in which the adhesive layer is made of an adhesive composition capable of reducing the visible light transmittance at a wavelength of 550 nm by irradiation with ultraviolet rays has a wavelength before and after irradiation with the LED. The average transmittance at 400 nm to 700 nm is reduced.

From this, it can be seen that when the pressure-sensitive adhesive sheet provided with the above-mentioned pressure-sensitive adhesive layer is used, the pressure-sensitive adhesive layer can be colored by irradiating with ultraviolet rays at an arbitrary timing.

In the evaluation of external light stability, Examples 1 to 7 using an ultraviolet absorbing layer having an average transmittance of 15% or less at a wavelength of 300 nm or more and 400 nm or less have a change rate after 120 hours from the start of leaving. It is 5.72% or less.

On the other hand, in Comparative Example 1 using a PET film having an average transmittance of 69% at a wavelength of 300 nm or more and 400 nm or less, the rate of change is 64.02% after 120 hours from the start of leaving.

From this, it can be seen that the use of an ultraviolet absorbing layer having an average transmittance of 15% or less at a wavelength of 300 nm or more and 400 nm or less is excellent in external light stability.

Then, in order to have excellent external light stability, when it is desired to leave the portion other than the colored portion in the adhesive layer transparent, or when it is desired to reduce the amount of coloring compared to the colored portion, the portion other than the colored portion is exposed to external light (ultraviolet rays). It can be seen that coloring can be suppressed.

1 Adhesive sheet 2 Adhesive layer 3 Ultraviolet absorption layer 4 Adhesive body 6 Intermediate laminate 7 Mask 8 1st mask 9 2nd mask 10 High light transmittance part 11 Low light transmittance part 20 High irradiation part 21 Non-irradiation / low irradiation part 22 Non-irradiated part 23 Low-irradiated part 40 First-irradiated part 41 Temporary non-irradiated part 42 Second-irradiated part 43 Third-irradiated part 44 Fourth-irradiated part 45 Part 46 Remaining part

Claims (24)

The adhesive layer and the active light absorbing layer arranged on one surface of the adhesive layer are provided.
The adhesive layer comprises an adhesive composition capable of reducing the visible light transmittance at a wavelength of 550 nm by irradiation with active light rays.
An adhesive sheet of the active light absorbing layer, wherein the average transmittance of active light is 15% or less. The adhesive layer comprises an adhesive composition capable of reducing visible light transmittance at a wavelength of 550 nm by irradiation with ultraviolet rays.
The active light absorbing layer is an ultraviolet absorbing layer.
The pressure-sensitive adhesive sheet according to claim 1, wherein the ultraviolet absorbing layer has an average transmittance of 15% or less at a wavelength of 300 nm or more and 400 nm or less. The pressure-sensitive adhesive sheet according to claim 2, wherein the ultraviolet absorbing layer has an average transmittance of 50% or more at a wavelength of 400 nm or more and 700 nm or less. The adhesive sheet according to claim 2 or 3, wherein the ultraviolet absorbing layer contains an ultraviolet absorbing agent. The aspect of any one of claims 1 to 4, wherein the adhesive composition contains an adhesive polymer which is a polymer of a monomer component, a compound which is colored by an acid, and a photoacid generator. Adhesive sheet. An adhesive layer preparation step of preparing an adhesive layer made of an adhesive composition capable of reducing visible light transmittance at a wavelength of 550 nm by irradiation with active light rays.
A method for producing an adhesive sheet, which comprises an arrangement step of arranging an active light absorbing layer having an average transmittance of 15% or less on one surface of the adhesive layer. After the adhesive layer preparation step and before the placement step,
The method for producing an adhesive sheet according to claim 6, wherein the adhesive layer is irradiated with active light rays. The method for producing an adhesive sheet according to claim 6, further comprising irradiating an active light beam after the arrangement step. A preparatory step for preparing an adhesive sheet produced by the method for producing an adhesive sheet according to claim 8.
The adhesive layer is irradiated with active light, and the adhesive layer is irradiated with a high irradiation portion having a relatively high irradiation amount of active light and a non-irradiation portion having a relatively low irradiation amount of active light or not being irradiated with active light. An irradiation step in which the visible light transmission of the high irradiation portion at a wavelength of 550 nm is made smaller than the visible light transmission of the non-irradiation / low irradiation portion at a wavelength of 550 nm by forming the / low irradiation portion, and ,
A method for producing an intermediate laminate, which comprises a sticking step of sticking the other surface of the pressure-sensitive adhesive sheet to an adherend. After the preparatory step, the irradiation step is carried out.
The method for producing an intermediate laminate according to claim 9, wherein the pasting step is carried out after the irradiation step. After the preparatory step, the sticking step is carried out.
The method for producing an intermediate laminate according to claim 9, wherein the irradiation step is carried out after the sticking step. The method for producing an intermediate laminate according to claim 10 or 11, wherein in the irradiation step, the adhesive layer is irradiated with active rays from the surface side of the active light absorbing layer. The method for producing an intermediate laminate according to claim 10, wherein in the irradiation step, the adhesive layer is irradiated with active light rays from the surface side of the adhesive layer. The method for producing an intermediate laminate according to claim 11, wherein in the irradiation step, the adhesive layer is irradiated with active light rays from the surface side of the adherend. The average transmittance of active light rays of the adherend is 60% or more.
The intermediate according to claim 14, wherein in the irradiation step, a mask for blocking active rays is placed on a part of the other surface on the adherend side, and then the adhesive layer is irradiated with active rays. Method for manufacturing a laminate. The adherend blocks active rays and
The method for producing an intermediate laminate according to claim 14, wherein the adherend is arranged on a part of the other surface of the pressure-sensitive adhesive sheet in the attachment step. The non-irradiated / low-irradiated portion is a non-irradiated portion that is not irradiated with active light rays.
The method for producing an intermediate laminate according to any one of claims 9 to 16, wherein the non-irradiated portion has a visible light transmittance of 80% or more at a wavelength of 550 nm. The non-irradiated / low-irradiated portion is a low-irradiated portion in which the irradiation amount of active light is low.
In the irradiation step, after arranging the first mask that blocks the active light beam, the adhesive layer is irradiated with the active light beam, so that the adhesive layer is subjected to the first irradiation portion irradiated with the active light beam and the active light beam. The first irradiation step of forming a temporary non-irradiated portion that has not been irradiated, and
After arranging a second mask that blocks active rays in the first irradiated portion, the temporary non-irradiated portion in the adhesive layer is irradiated with active rays to make the temporary non-irradiated portion into the second irradiated portion. With a second irradiation step
The invention according to any one of claims 9 to 15, wherein one of the first irradiation portion and the second irradiation portion is the high irradiation portion and the other is the low irradiation portion. The method for producing an intermediate laminate according to the description. The non-irradiated / low-irradiated portion is a low-irradiated portion in which the irradiation amount of active light is low.
The irradiation step includes a third irradiation step of irradiating the entire adhesive layer with active rays to make the entire adhesive layer a third irradiation portion irradiated with the active rays.
After arranging a mask that blocks the active light beam on a part of the third irradiation portion, the remaining portion of the third irradiation portion is irradiated with the active light beam, so that the remaining portion of the third irradiation portion is covered with the fourth irradiation portion. With a fourth irradiation step
The third irradiation portion is the low irradiation portion,
The method for producing an intermediate laminate according to any one of claims 9 to 15, wherein the fourth irradiated portion is the highly irradiated portion. The visible light transmittance of the highly irradiated portion at a wavelength of 550 nm is less than 20%.
The method for producing an intermediate laminate according to claim 18 or 19, wherein the low-irradiated portion has a visible light transmittance of 20% or more and 70% or less at a wavelength of 550 nm. An adhesive sheet having an adhesive layer and an active light absorbing layer arranged on one surface of the adhesive layer, and an adherend arranged on the other surface of the adhesive sheet.
The adhesive layer includes a high light transmittance portion having a relatively large visible light transmittance at a wavelength of 550 nm and a low light transmittance portion having a relatively small visible light transmittance at a wavelength of 550 nm.
An intermediate laminated body of the active light absorbing layer, characterized in that the average transmittance of active light is 15% or less. The intermediate laminate according to claim 21, wherein the low light transmittance portion has a pattern shape. The intermediate laminate according to claim 21 or 22, wherein the visible light transmittance of the high light transmittance portion at a wavelength of 550 nm is 80% or more. The visible light transmittance of the low light transmittance portion at a wavelength of 550 nm is less than 20%.
The intermediate laminate according to claim 21 or 22, wherein the visible light transmittance of the high light transmittance portion at a wavelength of 550 nm is 20% or more and 70% or less.

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