JP2020152889A - 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 a first 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 (ultraviolet 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 a first adhesive layer 2, a substrate 3 arranged on one side of the first adhesive layer 2 and a second adhesive layer 4 arranged on one side of the substrate 3. The first 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 substrate 3 and/or the second adhesive layer 4.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 first 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). An object of the present invention is to provide a method for producing the pressure-sensitive adhesive sheet, a method for producing an intermediate laminate obtained by using the pressure-sensitive adhesive sheet, and an intermediate laminate obtained by the method for producing the intermediate laminate.

The present invention [1] includes a first adhesive layer, a base material arranged on one surface of the first adhesive layer, and a second adhesive layer arranged on one surface of the base material. The adhesive layer comprises an adhesive composition whose visible light transmittance at a wavelength of 550 nm can be reduced by irradiation with active light, and the average transmittance of active light of the base material and / or the second adhesive layer is 15% or less. It is an adhesive sheet.

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

The adhesive sheet according to claim 2, wherein the present invention [3] has an average transmittance of 50% or more at a wavelength of 400 nm or more and 700 nm or less of the base material and / or the second adhesive layer. Includes.

In the present invention [4], the pressure-sensitive adhesive sheet according to the above [2] or [3], wherein the base material and / or the second pressure-sensitive adhesive layer contains an ultraviolet absorber.

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.

The present invention [6] comprises a first 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 one of the first adhesive layers. A base material arranging step of arranging a base material in a direction and a second adhesive layer arranging step of arranging a second adhesive layer on one surface of the base material are provided, and the base material and / or the second adhesive layer , A method for producing an adhesive sheet, wherein the average transmittance of active light is 15% or less.

The present invention [7] manufactures the pressure-sensitive adhesive sheet according to the above [6], wherein the first pressure-sensitive adhesive layer is irradiated with active light rays after the first pressure-sensitive adhesive layer preparation step and before the base material placement step. Includes method.

The present invention [8] includes the method for producing an adhesive sheet according to the above [6], wherein the first adhesive layer is irradiated with an active ray after the second adhesive layer arranging 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 first adhesive layer is irradiated with active light to apply the first adhesive layer. By forming a high-irradiation portion in which the irradiation amount of the active light is relatively high and a non-irradiation / low-irradiation portion in which the irradiation amount of the active light is relatively low or the active light is not irradiated, the high-irradiation portion is formed. An irradiation step in which the visible light transmittance at a wavelength of 550 nm is made smaller than the visible light transmittance at a wavelength of 550 nm of the non-irradiated / low-irradiated portion, and the other surface of the adhesive sheet is attached to an adherend. It includes a method of manufacturing an intermediate laminate comprising a sticking step.

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.

According to the present invention [12], the intermediate laminate according to the above [10] or [11] is produced by irradiating the first adhesive layer with an active ray from the surface side of the second adhesive layer in the irradiation step. Method.

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

The present invention [14] includes the method for producing an intermediate laminate according to the above [11], wherein in the irradiation step, the first 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 first 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 the first mask for blocking the active light is arranged, the first By irradiating the adhesive layer with active light, a first irradiation step of forming a first irradiated portion irradiated with active light and a temporary non-irradiated portion not irradiated with active light on the first adhesive layer. After arranging a second mask that blocks the active light beam on the first irradiated portion, the temporary non-irradiated portion of the first adhesive layer is irradiated with the active light beam to make the temporary non-irradiated portion second. [9] The above [9], which comprises a second irradiation step of forming an irradiation portion, 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 any one of [15] 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 first adhesive layer with the active light. After a third irradiation step in which the entire first adhesive layer is used as a third irradiation portion irradiated with the active light beam, and a mask for blocking the active light beam is placed on a part of the third irradiation portion, the first irradiation step is performed. 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 of the third irradiation portion with active light, and the third irradiation portion is the low irradiation portion. The method for producing an intermediate laminate according to any one of the above [9] to [15], wherein the fourth irradiation portion is the high irradiation 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 method for producing an intermediate laminate according to the above [18] or [19], which is described below, is included. ..

The present invention [21] is a pressure-sensitive adhesive sheet including a first pressure-sensitive adhesive layer, a base material arranged on one surface of the first pressure-sensitive adhesive layer, and a second pressure-sensitive adhesive layer arranged on one surface of the base material. The first adhesive layer is provided with an adherend arranged on the other surface of the adhesive sheet, and the first adhesive layer has a high light transmittance portion having a relatively large visible light transmittance at a wavelength of 550 nm and a relatively high light transmittance portion at a wavelength of 550 nm. An intermediate laminate having a low light transmittance portion having a small visible light transmittance and having an average transmittance of active light of 15% or less for the base material and / or the second adhesive layer.

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 first pressure-sensitive 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.

Therefore, the first 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 of the base material and / or the second pressure-sensitive adhesive layer is 15% or less.

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

The method for producing an adhesive sheet of the present invention includes a base material arranging step of arranging a base material on one surface of the first adhesive layer and a second adhesive layer arranging step of arranging a second adhesive layer on one surface of the base material. And.

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

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 light rays of the base material and / or the second adhesive 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 shows a schematic view showing an embodiment of the pressure-sensitive adhesive sheet of the present invention, FIG. 1A shows an embodiment of the pressure-sensitive adhesive sheet of the present invention, and FIG. 1B shows only a base material having active light absorption. The pressure-sensitive adhesive sheet is shown, FIG. 1C shows the pressure-sensitive adhesive sheet in which only the second pressure-sensitive adhesive layer has active light-absorbing property, and FIG. 1D shows the pressure-sensitive adhesive sheet in which both the base material and the second pressure-sensitive adhesive layer have active light-absorbing property. .. FIG. 2 is a schematic view showing an embodiment of a method for manufacturing an adhesive sheet, FIG. 2A shows a first adhesive layer preparation step for preparing a first adhesive layer, and FIG. 2B shows a first adhesive layer. A base material arranging step of arranging the base material on one surface is shown, and FIG. 2C shows a second adhesive layer arranging step of arranging the second adhesive layer on one surface of the base material. FIG. 3 is a schematic view showing an embodiment of a method for producing an adhesive sheet (when the entire first adhesive layer is irradiated with active light), and FIG. 3A is a first adhesive for preparing the first adhesive layer. The layer preparation step is shown, FIG. 3B shows a step of irradiating the entire first adhesive layer with active light from the surface side of the release film, and FIG. 3C shows a base material arranged on one surface of the first adhesive layer. 3D shows a second adhesive layer arranging step of arranging a second adhesive layer on one surface of the substrate, and FIG. 3E shows a release film on the substrate and the second adhesive layer. The process of re-pasting is shown. FIG. 4 is a schematic view showing an embodiment of a method for producing an adhesive sheet (when a part of the first adhesive layer is irradiated with active light), and FIG. 4A is a first view from the surface side of the release film. A step of irradiating a part of the adhesive layer with active light is shown, FIG. 4B shows a base material arranging step of arranging a base material on one surface of the first adhesive layer, and FIG. 4C shows a base material arranging step on one surface of the base material. , The second adhesive layer arranging step for arranging the second adhesive layer is shown, FIG. 4D shows a step of replacing the entire release film with the base material and the second adhesive layer, and FIG. 4E shows a part of the release film. The process of reattaching to the base material and the second adhesive layer is shown. FIG. 5 is a schematic view showing an embodiment of the intermediate laminate of the present invention. FIG. 6 is a schematic view showing a first A 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 shows a release film on the other side. An irradiation step of irradiating the first adhesive layer with active light rays from the surface side (the surface side of the first adhesive layer) is shown, and FIG. 6C shows a sticking step of sticking the adhesive sheet to the adherend. FIG. 7 is a schematic view showing a first B embodiment of the method for producing an intermediate laminate of the present invention, FIG. 7A shows a preparatory step for preparing an adhesive sheet, and FIG. 7B shows a release film on one side. The irradiation step of irradiating the first adhesive layer with an active ray from the surface side (the surface side of the second adhesive layer) is shown, and FIG. 7C shows a sticking step of sticking the adhesive sheet to the adherend. FIG. 8 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. 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 first adherend, and FIG. 8C shows irradiation of irradiating the first adhesive layer with active light from the surface side of the first adherend. The process is shown and FIG. 8D shows an intermediate laminate produced in the second A embodiment (when the adherend is the first adherend). FIG. 9 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. 9A is a preparation for preparing an adhesive sheet. The process is shown, FIG. 9B shows a sticking step of sticking the adhesive sheet to the second adherend, and FIG. 9C shows irradiation of irradiating the first adhesive layer with active light from the surface side of the second adherend. The process is shown, and FIG. 9D shows an intermediate laminate manufactured in the second A embodiment (when the adherend is the second adherend). FIG. 10 is a schematic view showing a second B 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 an adherend to the adhesive sheet. FIG. 10C shows an irradiation step of irradiating the first adhesive layer with active light from the surface side (the surface side of the second adhesive layer) of the release film on one side, and FIG. 10D shows an irradiation step of attaching to the first adhesive layer. , The intermediate laminate manufactured in the 2nd B embodiment is shown. FIG. 11 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. 11A shows a preparatory step for preparing an adhesive sheet, and FIG. 11B shows activity. A first irradiation step of forming a first irradiated portion and a provisionally non-irradiated portion by irradiating the temporary non-irradiated portion is shown, and FIG. , The second irradiation step to make the second irradiation portion is shown, and FIG. 11D shows the sticking step of sticking the adhesive sheet to the adherend. FIG. 12 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. 12A shows a preparatory step for preparing an adhesive sheet, and FIG. 12B shows a first. A third irradiation step is shown in which the entire first adhesive layer is used as the third irradiation portion by irradiating the entire 1 adhesive layer with the active light beam. FIG. 12C shows a part of the third irradiation portion with the active light beam. FIG. 12D shows a fourth irradiation step 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 mask for blocking the light. The sticking process of sticking a sheet to an adherend is shown. FIG. 13 is a schematic view showing a method for producing an intermediate laminate in which the low light transmittance portion of the first adhesive layer has a pattern shape, and FIG. 13A shows an irradiation step in which a plurality of masks for blocking active rays are arranged. Shown, FIG. 13B shows an intermediate laminate in which the low light transmittance portion of the first adhesive layer has a pattern shape.

1. 1. Adhesive Sheet As shown in FIG. 1A, 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 adhesive sheet 1 has a first adhesive layer 2, a base material 3 arranged on one surface of the first adhesive layer 2, and a second adhesive layer 4 arranged on one surface of the base material. Be prepared.

Further, the average transmittance of the base material 3 and / or the second adhesive layer 4 at a wavelength of 300 nm or more and 400 nm or less is within a predetermined range.

That is, the base material 3 and / or the second adhesive layer 4 has active light absorption.

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 base material 3 and / or the second adhesive layer 4 preferably has ultraviolet absorption.

If the base material 3 and / or the second adhesive layer 4 is provided with active light absorption, it is desired that the portion other than the colored portion in the first adhesive layer 2 remains transparent, or the amount of coloring is smaller than that of the colored portion. When it is desired to do so, it is possible to prevent the portion other than the colored portion from being colored by external light (ultraviolet rays).

Specifically, as shown in FIG. 1B, only the base material 3 has active light absorption, or as shown in FIG. 1C, only the second adhesive layer 4 has active light absorption, or FIG. As shown in 1D, both the base material 3 and the second adhesive layer 4 have active light absorption.

Preferably, from the viewpoint of reliably suppressing coloring by external light (active light), both the base material 3 and the second adhesive layer 4 have active light absorption.

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

The first adhesive layer 2 is a pressure-sensitive adhesive layer for adhering the adhesive sheet 1 to the adherend 15 (described later).

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

The first adhesive layer 2 is made of an adhesive composition (hereinafter, referred to as the first adhesive composition) whose visible light transmittance at a wavelength of 550 nm can be reduced by irradiation with active light rays.

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

Further, the first adhesive layer 2 is preferably 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 first adhesive composition is the type of photoacid generator described later (specifically, the photoacid generator uses acid. It depends on the wavelength of the generated active light).

The first tacky composition comprises a tacky polymer, an acid-colored compound, and a photoacid generator.

If the first adhesive composition contains an adhesive polymer, a compound colored by an acid, and a photoacid generator, the wavelength of the first adhesive layer 2 is 550 nm by irradiation with active light (preferably ultraviolet rays). The visible light transmittance in the above can be surely 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 first 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 blended in the above ratio. , Prepared by mixing (prepared as a solution of the first sticky composition when a polymer solution is used as the sticky polymer).

From the viewpoint of introducing a crosslinked structure into the adhesive polymer, the first adhesive composition is preferably blended with a crosslinking agent.

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 first 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 blended in the first adhesive composition, a cross-linking catalyst may be blended 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 first adhesive composition may contain, for example, a silane coupling agent, an adhesive imparting agent, a plasticizer, a softening agent, an antioxidant, a filler, a coloring agent, a surfactant, and an antistatic agent, if necessary. From the viewpoint of stabilization under an agent, fluorescent light or natural light, various additives such as an additive 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, the first sticky composition (when a polymer solution is used as the sticky polymer, the solution of the first sticky composition) is obtained.

The shear storage elastic modulus G'of this first 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. It is preferably 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 first adhesive layer 2 is formed from the first adhesive composition by the method described later.

Since the first adhesive layer 2 is composed of the first adhesive composition, an acid is generated from the photoacid generator by irradiation with active light (preferably ultraviolet rays), and the acid colors the compound to be colored by the acid. As a result, the first adhesive layer 2 changes from colorless (transparent) to colored. That is, the first 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 first 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. Base material The base material 3 is arranged on the entire surface of one surface of the first pressure-sensitive adhesive layer 2, and the base material 3 is a middle layer of the pressure-sensitive adhesive sheet 1.

The base material 3 has a film shape extending in the plane direction, and has a flat flat surface and a flat lower surface.

As described above, the base material 3 and / or the second adhesive layer 4 described later has active light absorption (preferably ultraviolet absorption).

When the base material 3 has active light absorption, the average transmittance of the active light of the base material 3 is 15% or less, preferably 10% or less, more preferably 9% or less, still more preferably. , 8% or less, particularly preferably 7% or less, most preferably 3% or less, and further 1% or less.

If the above average transmittance is equal to or less than the above upper limit, the portion other than the colored portion in the first adhesive layer 2 is not the colored portion when it is desired to remain transparent or when the amount of coloring is smaller than that of the colored portion. However, it is possible to suppress coloring by external light (ultraviolet rays). ..

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, when the base material 3 has an active light absorbing property, the base material 3 preferably has an ultraviolet absorbing property.

When the base material 3 has an ultraviolet absorber property, examples of the base material 3 include a resin film containing an ultraviolet absorber and an adhesive tape containing an ultraviolet absorber. That is, such a base material 3 contains an ultraviolet absorber. If the base material 3 contains an ultraviolet absorber, the average transmittance of the base material 3 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 base material 3, a film formed from a material that absorbs ultraviolet rays without blending an ultraviolet absorber, 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).

When the base material 3 has ultraviolet absorption, the average transmittance of the base material 3 at a wavelength of 300 nm or more and 400 nm or less is 15% or less, preferably 10% or less, more preferably 9% or less, and further. It is preferably 8% or less, 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 first 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 is used. , Coloring by external light (ultraviolet rays) can be suppressed.

When the base material 3 does not have active light absorption (preferably ultraviolet absorption), examples of the base material 3 include a film made of the material constituting the resin film described above.

When the base material 3 does not have active light absorption (preferably ultraviolet absorption), the average transmittance of the active light of the base material 3 is, for example, 50% or more, and for example, 80. % Or less, and in particular, when the base material 3 does not have ultraviolet absorption, the average transmittance of the base material 3 at a wavelength of 300 nm or more and 400 nm or less is, for example, 50% or more, and for example, for example. It is 80% or less.

When the base material 3 does not have ultraviolet absorption, the average transmittance of the base material 3 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. It is 70% or more, more preferably 80% or more, particularly preferably 85% or more, and most preferably 90% or more.

When the average transmittance is at least the above lower limit, the base material 3 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 base material 3 is a thickness at which 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. It is 50 μm or less.

The base material 3 may have one layer or a plurality of layers.

When the base material 3 has a plurality of layers, a plurality of base materials 3 of the same type or different types are laminated so that the above average transmittance and the above thickness are within the above ranges.

Further, the base material 3 can be subjected to a surface treatment (for example, a hard coat treatment), if necessary.
1-4. Second Adhesive Layer The second adhesive layer 4 is a lower layer of the adhesive sheet 1.

The second adhesive layer 4 is a pressure-sensitive adhesive layer.

The second adhesive layer 4 has a film shape extending in the plane direction, and has a flat flat surface and a flat lower surface.

As described above, the base material 3 and / or the second adhesive layer 4 has active light absorption (preferably ultraviolet absorption).

When the second adhesive layer 4 has ultraviolet absorption, the second adhesive layer 4 is made of the second adhesive composition.

The second adhesive composition includes the above-mentioned adhesive polymer, the above-mentioned ultraviolet absorber, and, if necessary, the above-mentioned cross-linking agent, the above-mentioned cross-linking catalyst, and the above-mentioned additive. That is, the second adhesive layer 4 made of such a second adhesive composition contains an ultraviolet absorber. If the second adhesive layer 4 contains an ultraviolet absorber, the average transmittance of the second adhesive layer 4 at a wavelength of 300 nm or more and 400 nm or less can be surely lowered.

The second adhesive composition includes an adhesive polymer (a polymer solution when the adhesive polymer is prepared by solution polymerization), the above-mentioned ultraviolet absorber, and if necessary, the above-mentioned cross-linking agent, the above-mentioned cross-linking catalyst, and the above-mentioned cross-linking catalyst. It is prepared by blending and mixing the above-mentioned additives with the above-mentioned additives.

Further, when the second adhesive layer 4 has an ultraviolet absorbing property, an adhesive tape containing an ultraviolet absorbing agent can be used as the second adhesive layer 4.

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).

On the other hand, when the second adhesive layer 4 does not have ultraviolet absorption, the second adhesive layer 4 is made of a third adhesive composition.

The third adhesive composition does not contain the above-mentioned ultraviolet absorber, but contains the above-mentioned adhesive polymer, and if necessary, the above-mentioned cross-linking agent, the above-mentioned cross-linking catalyst, and the above-mentioned additive.

The third adhesive composition comprises an adhesive polymer (a polymer solution when the adhesive polymer is prepared by solution polymerization) and, if necessary, the above-mentioned cross-linking agent, the above-mentioned cross-linking catalyst, and the above-mentioned additive. It is prepared by blending in proportions and mixing.

Then, the second adhesive layer 4 is formed from the second adhesive composition or the third adhesive composition by the method described later.

When the second adhesive layer 4 has ultraviolet absorption, the average transmittance of the second adhesive layer 4 at a wavelength of 300 nm or more and 400 nm or less is 15% or less, preferably 10% or less, more preferably 9. % Or less, more preferably 8% or less, 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 first 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 is 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 (ultraviolet rays).

Further, when the second adhesive layer 4 does not have active light absorption (preferably ultraviolet absorption), the average transmittance of active light of the base material 3 is, for example, 50% or more, and For example, 80% or less, and in particular, when the base material 3 does not have ultraviolet absorption, the average transmittance of the base material 3 at a wavelength of 300 nm or more and 400 nm or less is, for example, 50% or more. Further, for example, it is 80% or less.

When the second adhesive layer 4 does not have ultraviolet absorption, the average transmittance of the second adhesive layer 4 at a wavelength of 400 nm or more and 700 nm or less is, for example, 40% or more, preferably 50% or more. It is more preferably 70% or more, further preferably 80% or more, particularly preferably 85% or more, and most preferably 90% or more.

When the average transmittance is at least the above lower limit, the second adhesive layer 4 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 second adhesive layer 4 is a thickness at which the above-mentioned average transmittance can be obtained, for example, 5 μm or more, and for example, 200 μm or less.

The second adhesive layer 4 may be one layer or a plurality of layers.

When the second adhesive layer 4 is a plurality of layers, a plurality of the same or different types of second adhesive layers 4 are laminated so that the above average transmittance and the above thickness are within the above ranges.
1-5. 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 producing the pressure-sensitive adhesive sheet 1 includes a first pressure-sensitive adhesive layer preparation step for preparing the first pressure-sensitive adhesive layer 2, a base material placement step for arranging the base material 3 on one surface of the first pressure-sensitive adhesive layer 2, and a base material 3 method. A second adhesive layer arranging step for arranging the second adhesive layer 4 is provided on one surface.

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

To prepare the first 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 first adhesive composition (solution of the first 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 first 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 the like. Examples include lip coats and die coats.

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 first adhesive layer 2 is arranged (prepared) on one surface of the release film 5.

When the first adhesive composition contains a cross-linking agent, it is dried and removed at the same time, or after the solvent is dried (if necessary, after the release film 5 is laminated on one surface of the first adhesive layer 2). In addition, preferably, cross-linking 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 base material arranging step, as shown in FIG. 2B, the base material 3 is arranged on one surface of the first adhesive layer 2.

In the second adhesive layer arranging step, as shown in FIG. 2C, the second adhesive layer 4 is arranged on one surface of the base material 3.

As a result, the release film 5 is arranged on one surface of the release film 5, the first adhesive layer 2 arranged on one surface of the release film 5, the base material 3 arranged on one surface of the first adhesive layer 2, and one surface of the base material 3. An adhesive sheet 1 provided with the second adhesive layer 4 to be formed is obtained.

If necessary, the release film 5 arranged on the other surface of the first adhesive layer 2 can be peeled off.

In such a case, the adhesive sheet 1 has a first adhesive layer 2, a base material 3 arranged on one surface of the first adhesive layer 2, and a second adhesive layer arranged on one surface of the base material 3. Prepare with 4.

Further, if necessary, the release film 5 can be arranged on one surface of the second adhesive layer 4 (see the dotted line in FIG. 2C).

In such a case, the adhesive sheet 1 includes the release film 5, the first adhesive layer 2 arranged on one surface of the release film 5, and the base material 3 arranged on one surface of the first adhesive layer 2. A second adhesive layer 4 arranged on one surface of the base material 3 and a release film 5 arranged on one surface of the second adhesive layer are provided.

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

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 first adhesive layer 2 is colored by irradiating light 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 first adhesive layer 2 on one surface of the transparent substrate, the first adhesive composition (solution of the first adhesive composition) is applied to one surface of the transparent substrate in the same manner as described above. Apply and dry remove solvent if necessary.

Then, the adhesive sheet 1 may be irradiated with active light rays (preferably ultraviolet rays) at the time of manufacturing the intermediate laminated body 6 described later or before manufacturing the intermediate laminated body 6 described later. it can.

When irradiating the first adhesive layer 2 with active rays (preferably ultraviolet rays) during the production of the intermediate laminate 6, specifically, after arranging the second adhesive layer, the active rays (preferably ultraviolet rays) are applied. Irradiate.

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 first adhesive layer 2 is irradiated with active light rays (preferably ultraviolet rays) before the production of the intermediate laminate 6 described later, specifically, after the first adhesive layer preparation step, the base material is arranged. Before the step, it is irradiated with active light (preferably ultraviolet light).

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

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

Next, in the base material arranging step, as shown in FIG. 3C, the base material 3 is arranged on one surface of the first adhesive layer 2.

Next, as shown in FIG. 3D, in the second adhesive layer arranging step, the second adhesive layer 4 is arranged on one surface of the base material 3.

According to this method, the entire first 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, in the base material arranging step, the base material 3 is arranged on one surface of the first adhesive layer 2, and in the second adhesive layer arranging step, the second adhesive layer is placed on one surface of the base material 3. 4 is arranged, but as shown in FIG. 3E, the release film 5 on the other side of the first adhesive layer 2 (transparent base material when the first adhesive layer 2 is prepared on one side of the transparent base material) is used as a base. It may be replaced with the material 3 and the second adhesive layer 4.

Specifically, the release film 5 on the other side of the first adhesive layer 2 (transparent base material when the first adhesive layer 2 is prepared on one surface of the transparent base material) is peeled off, and the other of the first adhesive layer 2 is peeled off. The base material 3 is arranged in the direction, and the second adhesive layer 4 is arranged on the other surface of the base material 3.

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

In such a case, as shown in FIG. 4A, 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 base material arranging step, as shown in FIG. 4B, the base material 3 is arranged on one surface of the first adhesive layer 2.

Next, in the second adhesive layer arranging step, as shown in FIG. 4C, the second adhesive layer 4 is arranged on one surface of the base material 3.

As a result, a part of the first 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 first adhesive layer 2 (transparent base material when the first adhesive layer 2 is prepared on one side of the transparent base material) is used as the base material 3 and the second. It can also be replaced with the adhesive layer 4.

Specifically, as shown in FIG. 4D, the entire release film 5 can be replaced with the base material 3 and the second adhesive layer 4, and as shown in FIG. 4E, active light (preferably ultraviolet rays). ) Is placed on the other surface of the portion 52 that is not irradiated with), and only the release film 5 (transparent substrate when the first adhesive layer 2 is prepared on one surface of the transparent substrate) is applied to the substrate 3 and the second adhesive layer 4. You can also replace it.

Further, in the above description, the pressure-sensitive adhesive sheet 1 is composed of the first pressure-sensitive adhesive layer 2, the base material 3, and the second pressure-sensitive adhesive layer 4, but between the first pressure-sensitive adhesive layer 2 and the base material 3 and / or the base material. An intermediate layer such as the above-mentioned transparent base material may be interposed between the 3 and the second adhesive layer 4.
2. 2. Intermediate Laminated Body As shown in FIG. 5, 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 a first adhesive layer 2, a base material 3 arranged on one surface of the first adhesive layer 2, and a second adhesive layer 4 arranged on one surface of the base material 3. The pressure-sensitive adhesive sheet 1 is provided with the adhesive sheet 1 and the adherend 15 arranged on the other surface of the pressure-sensitive adhesive sheet 1 (the other surface of the first adhesive layer 2).

Further, in the intermediate laminate 6, when the release film 5 is arranged on one surface of the adhesive sheet 1 (one surface of the second adhesive layer 4), the intermediate laminate 6 is combined with the first adhesive layer 2. , The base material 3 arranged on one surface of the first adhesive layer 2, the second adhesive layer 4 arranged on one surface of the base material 3, and the release film 5 arranged on one surface of the second adhesive layer 4. It includes an adhesive sheet 1 provided with (see the dotted line in FIG. 5) and an adherend 15 arranged on the other surface of the adhesive sheet 1 (the other surface of the first adhesive layer 2).

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 15.

Since the intermediate laminate 6 includes the base material 3 and the second adhesive layer 4, it is possible to prevent the non-irradiated / low-irradiated portion 21 (described later) in the first adhesive layer 2 from being colored by external light (active light). it can.
2-1. Adhesive sheet As described above, the adhesive sheet 1 includes the release film 5, the first adhesive layer 2 arranged on one surface of the release film 5, and the base material 3 arranged on one surface of the first adhesive layer 2. A second adhesive layer 4 arranged on one surface of the base material 3 is provided.

Further, as described above, the pressure-sensitive adhesive sheet 1 may have the release film 5 laminated on one surface of the second pressure-sensitive adhesive layer 4, if necessary.

In such a case, the adhesive sheet 1 includes the release film 5, the first adhesive layer 2 arranged on one surface of the release film 5, and the base material 3 arranged on one surface of the first adhesive layer 2. A second adhesive layer 4 arranged on one surface of the base material 3 and a release film 5 arranged on one surface of the second adhesive layer are provided.

In the following description, the case where the pressure-sensitive adhesive sheet 1 provided with the release film 5 is used on one surface of the second pressure-sensitive adhesive layer 4 will be described in detail.

Further, the first 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 having a relatively small visible light transmittance at a wavelength of 550 nm. It includes a portion 11.

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 15 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 15 has a flat plate shape, but the shape of the adherend 15 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 for producing the intermediate laminate 6, when the first adhesive layer 2 is irradiated with active light rays (preferably ultraviolet rays) from the surface side of the adherend 15, the second A embodiment described later. ), The method for producing the intermediate laminate 6 is determined by whether the adherend 15 transmits the active light rays (preferably ultraviolet rays) or blocks the active rays (preferably ultraviolet rays).

Among such adherends 15, the adherend 15 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 15, the adherend 15 (hereinafter, referred to as the second adherend 31) that blocks the active rays (preferably ultraviolet rays) is the second that absorbs the 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 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 first adhesive layer 2 is irradiated with active light (preferably ultraviolet rays) to irradiate the first adhesive layer 2 with active light (preferably ultraviolet rays). In addition, the high irradiation portion 20 having a relatively high irradiation amount of active light (preferably ultraviolet rays) and the highly irradiated portion 20 having a relatively low irradiation amount of active light (preferably ultraviolet rays) or active light (preferably ultraviolet rays). By forming the non-irradiated / low-irradiated portion 21 that is not irradiated with light, the visible light transmittance of the high-irradiated portion 20 at a wavelength of 550 nm is higher than that of the non-irradiated / low-irradiated portion 21 at a wavelength of 550 nm. It includes an irradiation step of reducing the size and a sticking step of sticking the other surface of the pressure-sensitive adhesive sheet 1 to the adherend 15.

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 release film 5 on the other side is active from the surface side (the surface side of the first adhesive layer 2) to the first adhesive layer 2. Irradiate with light rays (preferably ultraviolet rays) (hereinafter referred to as the first A embodiment), or from the surface side of the release film 5 on one side (the surface side of the second adhesive layer 4) to the first adhesive layer 2 Is irradiated with active light rays (preferably ultraviolet rays) (hereinafter, referred to as the first B embodiment). Further, in the second embodiment, the first adhesive layer 2 is irradiated with active light rays (preferably ultraviolet rays) from the surface side of the adherend 15 (hereinafter referred to as the second A embodiment), or one of them. The first adhesive layer 2 is irradiated with active light rays (preferably ultraviolet rays) from the surface side of the release film 5 on the side (the surface side of the second adhesive layer 4) (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 first adhesive layer 2 is irradiated with active light rays (preferably ultraviolet rays) from the surface side of the first 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. 6A.

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

In the following description, when a part of the adhesive sheet 1 (first adhesive layer 2) is irradiated with active light rays (preferably ultraviolet rays), specifically, the adhesive sheet 1 is divided into three in the plane direction. A part of the pressure-sensitive adhesive sheet 1 (first adhesive layer 2) irradiated with active light rays (preferably ultraviolet rays) and irradiated with active rays (preferably ultraviolet rays) at two places at both ends of the high-irradiated portion 20 (preferably ultraviolet rays) In other words, 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, active light rays (preferably ultraviolet rays) are applied to the highly irradiated portion 20 from the surface side (the surface side of the first pressure-sensitive adhesive layer 2) of the release film 5 on the other side. The non-irradiated portion 22 is irradiated and is not irradiated with active light rays (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 that blocks active light (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), and the other side is peeled off. Active light rays (preferably ultraviolet rays) are irradiated from the surface side of the film 5 (the surface side of the first adhesive layer 2).

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

Then, in the first 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 first adhesive layer 2 in the highly irradiated portion 20 changes from colorless (transparent) to colored (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. 6C, the other surface of the adhesive sheet 1 (the other surface of the first adhesive layer 2) is attached to the adherend 15.

Specifically, the release film 5 is peeled off from the other surface of the pressure-sensitive adhesive sheet 1, and the adherend 15 is placed on the other side surface of the pressure-sensitive adhesive sheet 1 (the other surface of the first pressure-sensitive adhesive layer 2).

As a result, the adherend 15, the first adhesive layer 2 arranged on one surface of the adherend 15, the base material 3 arranged on one surface of the first adhesive layer 2, and one surface of the base material 3 An intermediate laminate 6 including a second adhesive layer 4 arranged on the surface of the second adhesive layer and a release film 5 arranged on one surface of the second adhesive layer is obtained.

Further, in the intermediate laminate 6, the first 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 having a relatively small visible light transmittance at a wavelength of 550 nm. It includes a transmittance 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, active light rays (preferably ultraviolet rays) are applied to the first adhesive layer 2 from the surface side of the release film 5 on the other side (the surface side of the first adhesive layer 2). Since the irradiation is performed, the first adhesive layer 2 can be reliably colored.

Further, in particular, if the adherend 15 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 first adhesive layer 2 is irradiated with active light rays (preferably ultraviolet rays) from the surface side of the second adhesive layer 4.

Specifically, in the irradiation step, active light rays (preferably ultraviolet rays) having an amount of light exceeding the absorption amounts of the base material 3 and the second adhesive layer 4 from the surface side of the second adhesive layer 4 to the second adhesive layer 4. The first adhesive layer 2 is discolored by irradiating with.

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

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 irradiation step, as shown in FIG. 7B, the first adhesive layer 2 is irradiated with active rays (preferably ultraviolet rays), and the first adhesive layer 2 is relatively irradiated with active rays (preferably ultraviolet rays). A high-irradiation portion 20 having a high amount and a non-irradiation portion 22 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 exposed to active light rays (preferably ultraviolet rays) from the surface side (surface side of the second adhesive layer 4) of the release film 5 on one side. The non-irradiated portion 22 is not irradiated with the active light rays (preferably ultraviolet rays), and the non-irradiated portion 22 is irradiated with the active light rays (preferably ultraviolet rays) having an amount of light exceeding the absorption amount of the base material 3 and the second adhesive layer 4.

Specifically, the mask 7 that blocks active light rays (preferably ultraviolet rays) is not arranged on the highly irradiated portion 20 (specifically, one surface of the release film 5 arranged on one side 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, one surface of the release film 5 arranged on one side of the non-irradiated portion 22), and the release film on one side is arranged. Active light rays (preferably ultraviolet rays) (active rays (preferably ultraviolet rays) having an amount of light exceeding the absorption amounts of the base material 3 and the second adhesive layer 4) are emitted from the surface side of 5 (the surface side of the second adhesive layer 4). Irradiate.

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. 7C, the other surface of the adhesive sheet 1 (the other surface of the first adhesive layer 2) is attached to the adherend 15 in the same manner as in the first A embodiment described above.

As a result, the adherend 15, the first adhesive layer 2 arranged on one surface of the adherend 15, the base material 3 arranged on one surface of the first adhesive layer 2, and one surface of the base material 3 An intermediate laminate 6 including a second adhesive layer 4 arranged on the surface of the second adhesive layer and a release film 5 arranged on one surface of the second adhesive layer is obtained.

Further, in the intermediate laminate 6, the first 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 having a relatively small visible light transmittance at a wavelength of 550 nm. It includes a transmittance 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, active light (preferably ultraviolet rays) is applied to the first adhesive layer 2 from the surface side of the release film 5 on one side (the surface side of the second adhesive layer 4). In order to irradiate, it is necessary to irradiate the base material 3 and / or the second adhesive layer 4 with active light (preferably ultraviolet rays) having a large amount of light, which makes it easy to control the transmittance of the highly irradiated portion 20. Become.

Further, in particular, if the adherend 15 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 first adhesive layer 2 is irradiated with active light rays (preferably ultraviolet rays) from the surface side of the adherend 15.

In the second A embodiment, depending on whether the adherend 15 transmits an active ray (preferably ultraviolet light) or blocks the active ray (preferably ultraviolet ray) (specifically, the adherend 15). 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 15 is the first adherend 30 and the case where the adherend 15 is the second adherend 31 will be described separately.

A second A embodiment in the case where the adherend 15 is the first adherend 30 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 other surface of the adhesive sheet 1 (the other surface of the first 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. 8C, the first adhesive layer 2 is irradiated with active rays (preferably ultraviolet rays), and the first adhesive layer 2 is relatively irradiated with active rays (preferably ultraviolet rays). A high-irradiation portion 20 having a high amount and a non-irradiation portion 22 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 active rays (preferably ultraviolet rays) are applied to the first adhesive layer 2. Irradiate.

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. 8D, the adherend 15 (first adherend 30), the first adhesive layer 2 arranged on one surface of the adherend 15 (first adherend 30), and the first adhesive layer 2 The base material 3 arranged on one surface of the first adhesive layer 2, the second adhesive layer 4 arranged on one surface of the base material 3, and the release film 5 arranged on one surface of the second adhesive layer An intermediate laminated body 6 is obtained.

Further, in the intermediate laminate 6, the first 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 having a relatively small visible light transmittance at a wavelength of 550 nm. It includes a transmittance 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 15 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 15 is the first adherend 30), in the irradiation step, the first adhesion is performed from the surface side of the adherend 15 (first adherend 30). Since the layer 2 is irradiated with active light rays (preferably ultraviolet rays), the accuracy of alignment of the portion to be colored is improved.

Further, according to the second A embodiment (when the adherend 15 is the first adherend 30), since the first adherend 15 is used, the adherend 15 (first adherend 30). The first 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 15 is the second adherend 31 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 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 first adhesive layer 2).

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

In the following description, as shown in FIG. 9B, 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. 9C, the first adhesive layer 2 is irradiated with active rays (preferably ultraviolet rays), and the first adhesive layer 2 is relatively irradiated with active rays (preferably ultraviolet rays). A high-irradiation portion 20 having a high amount and a non-irradiation portion 22 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 15 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. 9D, the adherend 15 (second adherend 31), the first adhesive layer 2 arranged on one surface of the adherend 15 (second adherend 31), and the first adhesive layer 2 The base material 3 arranged on one surface of the first adhesive layer 2, the second adhesive layer 4 arranged on one surface of the base material 3, and the release film 5 arranged on one surface of the second adhesive layer An intermediate laminated body 6 is obtained.

Further, in the intermediate laminate 6, the first 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 having a relatively small visible light transmittance at a wavelength of 550 nm. It includes a transmittance 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 15 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 15 is the second adherend 31), in the irradiation step, the first adhesion is performed from the surface side of the adherend 15 (second adherend 31). Since the layer 2 is irradiated with active light rays (preferably ultraviolet rays), the accuracy of alignment of the portion to be colored is improved.

Further, according to the second A embodiment (when the adherend 15 is the second adherend 31), the portion where the second adherend 15 is arranged (non-irradiated portion 22) is surely exposed to the active light beam (when the adherend 15 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 first adhesive layer 2 is irradiated with active light rays (preferably ultraviolet rays) from the surface side of the second adhesive layer 4.

Specifically, as in the first B embodiment, in the irradiation step, from the surface side of the release film 5 on one side (the surface side of the second adhesive layer 4) to the first adhesive layer 2, the base material 3 and the first 2 The first adhesive layer 2 is discolored by irradiating an active light beam (preferably ultraviolet rays) with a light amount exceeding the absorption amount of the adhesive layer 4.

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

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 sticking step, as shown in FIG. 10B, the other surface of the adhesive sheet 1 (the other surface of the first adhesive layer 2) is attached to the adherend 15 in the same manner as in the first A embodiment described above.

In the irradiation step, as shown in FIG. 10C, the first adhesive layer 2 is irradiated with active rays (preferably ultraviolet rays), and the first adhesive layer 2 is relatively irradiated with active rays (preferably ultraviolet rays). A high-irradiation portion 20 having a high amount and a non-irradiation portion 22 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 exposed to active light rays (preferably ultraviolet rays) from the surface side (surface side of the second adhesive layer 4) of the release film 5 on one side. The non-irradiated portion 22 is not irradiated with the active light rays (preferably ultraviolet rays), and the non-irradiated portion 22 is irradiated with the active light rays (preferably ultraviolet rays) in an amount exceeding the absorption amount of the base material 3 and the second adhesive layer 4.

Specifically, the mask 7 that blocks active light rays (preferably ultraviolet rays) is not arranged on the high irradiation portion 20 (specifically, one surface of the release film 5 arranged on one side of the high irradiation portion 20). A mask 7 for blocking active light rays (preferably ultraviolet rays) is arranged on the non-irradiated portion 22 (specifically, one surface of the release film 5 arranged on one side of the non-irradiated portion 22), and the release film on one side is arranged. Active light rays (preferably ultraviolet rays) are irradiated from the surface side of No. 5 (the surface side of the second adhesive layer 4).

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. 10D, the adherend 15, the first adhesive layer 2 arranged on one surface of the adherend 15, and the base material 3 arranged on one surface of the first adhesive layer 2 An intermediate laminate 6 including a second adhesive layer 4 arranged on one surface of the base material 3 and a release film 5 arranged on one surface of the second adhesive layer can be obtained.

Further, in the intermediate laminate 6, the first 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 having a relatively small visible light transmittance at a wavelength of 550 nm. It includes a transmittance 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, active light (preferably ultraviolet rays) is applied to the first adhesive layer 2 from the surface side of the release film 5 on one side (the surface side of the second adhesive layer 4). In order to irradiate, it is necessary to irradiate the base material 3 and / or the second adhesive layer 4 with active light (preferably ultraviolet rays) having a large amount of light, which makes it easy to control the transmittance of the highly irradiated portion 20. Become.

Further, in particular, if the adherend 15 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, the irradiation step activates the first adhesive layer 2 after arranging the first mask 8 that blocks active light (preferably ultraviolet rays). By irradiating the first adhesive layer 2 with light rays (preferably ultraviolet rays), the first irradiated portion 40 irradiated with the active rays (preferably ultraviolet rays) and the active rays (preferably ultraviolet rays) are irradiated. After arranging the first irradiation step of forming the non-irradiated temporary non-irradiated portion 41 and the second mask 9 for blocking the active light (preferably ultraviolet rays) in the first irradiated portion 40, the first adhesive layer 2 is formed. The provisional non-irradiation portion 41 is provided with a second irradiation step of irradiating the temporary non-irradiation portion 41 with active light (preferably ultraviolet rays) to make the temporary non-irradiation portion 41 into a second irradiation portion 42.

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. 11A, the adhesive sheet 1 is prepared in the same manner as in the first A embodiment described above.

In the irradiation step, the first adhesive layer 2 is irradiated with active rays (preferably ultraviolet rays), and the first adhesive layer 2 is irradiated with relatively high amounts of active rays (preferably ultraviolet rays) 20. And the low irradiation portion 23 having a relatively low irradiation amount of active light rays (preferably ultraviolet rays).

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. 11B, active light rays (preferably ultraviolet rays) are applied to the first irradiation portion 40 from the surface side (the surface side of the first adhesive layer 2) of the release film 5 on the other side. Irradiate, and do not irradiate the temporary non-irradiated portion 41 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 (the surface side of the first adhesive layer 2) of the release film 5 on the other side.

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

Then, in the first adhesive layer 2 in the first irradiated 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 first 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, as shown in FIG. 11C, 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 first adhesive layer 2, while the first irradiation step is performed. The irradiated portion 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 first 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 first adhesive layer 2 in the second irradiation 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 first 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 first 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. 11, 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 sticking step, as shown in FIG. 11D, the other surface of the adhesive sheet 1 (the other surface of the first adhesive layer 2) is attached to the adherend 15 in the same manner as in the first A embodiment described above.

As a result, the adherend 15, the first adhesive layer 2 arranged on one surface of the adherend 15, the base material 3 arranged on one surface of the first adhesive layer 2, and one surface of the base material 3 An intermediate laminate 6 including a second adhesive layer 4 arranged on the surface of the second adhesive layer and a release film 5 arranged on one surface of the second adhesive layer is obtained.

Further, in the intermediate laminate 6, the first 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 having a relatively small visible light transmittance at a wavelength of 550 nm. It includes a transmittance 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 first adhesive layer 2 having regions having different colors.

Further, in particular, if the adherend 15 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. 12A, 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. 12B, 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 first adhesive layer 2).

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

Further, in the first 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 first 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. 12C, after arranging a mask 7 for blocking active light 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 first adhesive layer 2, while the remaining portion of the third irradiation portion 43 is irradiated. Does not irradiate 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 first 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 first adhesive layer 2 in the fourth irradiated 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 attachment step, as shown in FIG. 12D, the other surface of the adhesive sheet 1 (the other surface of the adhesive layer 2) is attached to the adherend 15 in the same manner as in the first A embodiment described above.

As a result, the adherend 15, the first adhesive layer 2 arranged on one surface of the adherend 15, the base material 3 arranged on one surface of the first adhesive layer 2, and one surface of the base material 3 An intermediate laminate 6 including a second adhesive layer 4 arranged on the surface of the second adhesive layer and a release film 5 arranged on one surface of the second adhesive layer 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 15 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 first adhesive layer 2 has a pattern shape.

Specifically, in the irradiation step of the first A embodiment, as shown in FIG. 13A, a mask 7 that blocks a plurality of active rays (preferably ultraviolet rays) is arranged on the other surface of the release film 5 on the other side (preferably, ultraviolet rays). Specifically, four are arranged at intervals 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. 13B, the low light transmittance portion 11 in the first adhesive layer 2 has a pattern shape. It is possible to obtain the intermediate laminated body 6 having.

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: 2EHA acrylate: 2-ethylhexyl acrylate NVP: N-vinylpyrrolidone MMA: Methylmethacrylate HEA: Hydroxyethyl acrylatetetrad C: Trade name: 1,3-bis (N, N-diglycidylamino) ) cyclohexane (epoxy crosslinking agent), Mitsubishi gas chemical Co. BLACK ND1: leuco dyes, Yamada chemical Co., Ltd. CPI-310B: sulfonium and _{(C 6 F 5) 4 B} - consisting of the salts, photoacid generator, Apro KC2UA: TAC film, thickness 25 μm, UVA-TAC: KC2UA manufactured by Konica Minolta Co., Ltd., and a hard coat layer in order (by hard coat treatment, KC2UA (thickness: 25 μm) on one side of a hard coat layer (thickness) : Obtained by forming 7 μm)), thickness 32 μm
UVA-OCA: Adhesive tape with UV absorption function, trade name "CS9934U", thickness 100 μm, PET film manufactured by Nitto Denko Corporation: thickness 25 μm
2. 2. Preparation of adhesive sheet 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.

In this adhesive polymer solution, Tetrad C as a cross-linking agent is added to 100 parts by mass of the adhesive polymer in the adhesive polymer solution by 0.075 parts by mass, and BLACK ND1 (Leuco) is used as a compound to be colored with an acid. 2 parts by mass of the adhesive polymer 100 parts by mass of the adhesive polymer in the solution of the adhesive polymer), CP-310B (photoacid generator) as the acid generator, and the adhesive polymer 100 in the solution of the adhesive polymer 10 parts by mass was added with respect to parts by mass and mixed uniformly to prepare a first adhesive composition.

Next, the first 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, and the thickness after drying was 25 μm. It was applied 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 first adhesive layer was manufactured (prepared).

Next, the release film B arranged on one surface of the first adhesive layer is peeled off, and a glass substrate, a low adhesive layer made of a known adhesive, and a PET film as a base material (base material A) are known. A high adhesive layer made of the above-mentioned adhesive, a PET film as a base material (base material B), UVA-OCA as a second adhesive layer, and a release film C (polyethylene terephthalate film) as a first adhesive layer. They were arranged in order on one side.

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, the release film A, the first adhesive layer, the glass substrate, the low adhesive layer, the PET film (base material A), the high adhesive layer, the PET film (base material B), and the second An adhesive sheet including an adhesive layer and a release film C in this order was obtained.

Example 2
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that UVA-TAC was used as the base material B and the second pressure-sensitive adhesive layer A was used as the second pressure-sensitive adhesive layer.

The second adhesive layer A was prepared by the following method.
(Preparation of second adhesive layer A)
In a reaction vessel equipped with a thermometer, a stirrer, a reflux cooling tube and a nitrogen gas introduction tube, 63 parts by mass of 2-ethylhexyl acrylate (2EHA), 15 parts by mass of N-vinylpyrrolidone (NVP) and methyl methacrylate (MMA) are used as monomer components. ) 9 parts by mass, 13 parts by mass of hydroxyethyl acrylate (HEA), 0.2 parts by weight of azobisisobutyronitrile as a polymerization initiator, and 233 parts by weight of ethyl acetate as a solvent, and nitrogen gas was allowed to flow. Nitrogen substitution was carried out for about 1 hour with stirring. Then, it was heated to 60 degreeC and reacted for 7 hours to obtain a third sticky composition having a weight average molecular weight (Mw) of 12000000.

After drying this third adhesive composition on a base material with a polyethylene terephthalate (PET) film ("Diafoil MRF75" manufactured by Mitsubishi Chemical Corporation) having a thickness of 75 μm provided with a silicone-based release layer on the surface with a fountain roll. The film was applied so as to have a thickness of 50 μm, cured under the conditions of a drying temperature of 130 ° C. and a drying time of 30 seconds, and dried. A PET film with a thickness of 75 μm (“Diafoil MRE75” manufactured by Mitsubishi Chemical Corporation) with one side treated with silicone as a cover sheet (release film) is bonded onto this coating film to manufacture (prepare) a 50 μm second adhesive layer A. )did.

Example 3
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that UVA-TAC was used as the base material B and UVA-OCA was used as the second pressure-sensitive adhesive layer.

Comparative Example 1
A PET film was used as the base material B, and a pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that the second pressure-sensitive adhesive layer A was used as the second pressure-sensitive adhesive layer.
4. Evaluation (Average transmittance of the first adhesive layer before LED irradiation)
The release film B arranged on one surface of the first adhesive layer of Example 1 was peeled off, and one surface of the first adhesive layer was attached to a glass substrate.

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

This sample for measuring the average transmittance is installed in a transmittance measuring device (U4100 spectrophotometer, manufactured by Nippon High Technologies Co., Ltd.) so that the first adhesive layer is arranged on the light source side, and the average at a wavelength of 400 nm to 700 nm. The transmittance 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 first adhesive layer after LED irradiation)
After irradiating the first adhesive layer in the above sample for measuring the average transmittance with the 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 base material B and second adhesive layer)
Each base material B, each second adhesive layer, and the base material B and the second adhesive layer bonded together are installed in a transmittance measuring device (U4100 spectrophotometer, manufactured by Nippon High Technologies Co., Ltd.) and have a wavelength of 300 nm or more. The average transmittance at 400 nm and the average transmittance at wavelengths of 400 nm to 700 nm were measured, respectively.

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 second adhesive 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, from the adhesive sheet, a low adhesive layer arranged on one surface of a glass substrate, a PET film, a high adhesive layer, a base material B, a second adhesive layer, and a release film C are formed. It was peeled off, and the release film A arranged on the other surface of the first adhesive layer was peeled off.

As a result, a sample for measuring external light stability was prepared, which provided the first 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 first adhesive layer is composed of the first adhesive composition capable of reducing the visible light transmittance at a wavelength of 550 nm by irradiation with ultraviolet rays irradiates the LED. The average transmittance at wavelengths of 400 nm to 700 nm before and after is reduced.

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

In the evaluation of external light stability, Examples 1 to 3 using the base material and / or the second adhesive layer having an average transmittance of 15% or less at a wavelength of 300 nm or more and 400 nm or less have passed 120 hours from the start of leaving. Later, the rate of change is 1.11-5.72% or less.

On the other hand, as the base material, a PET film having an average transmittance of 69% at a wavelength of 300 nm or more and 400 nm or less is used, and as the second adhesive layer, the second adhesive layer A having the above average transmittance of 65.17% is used. In Comparative Example 1, the rate of change was 64.02% 120 hours after the start of leaving.

From this, it can be seen that the external light stability is excellent when the base material and / or the second adhesive layer having an average transmittance of 15% or less at a wavelength of 300 nm or more and 400 nm or less is used.

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 1st adhesive layer 3 Base material 4 2nd adhesive layer 6 Intermediate laminate 7 Mask 8 1st mask 9 2nd mask 10 High light transmittance part 11 Low light transmittance part 15 Adhesion 20 High irradiation part 21 Non-irradiated / low-irradiated 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

Claims (24)

A first adhesive layer, a base material arranged on one surface of the first adhesive layer, and a second adhesive layer arranged on one surface of the base material are provided.
The first adhesive layer comprises an adhesive composition capable of reducing visible light transmittance at a wavelength of 550 nm by irradiation with active light rays.
An adhesive sheet having an average transmittance of active light rays of 15% or less for the base material and / or the second adhesive layer. The first adhesive layer comprises an adhesive composition capable of reducing visible light transmittance at a wavelength of 550 nm by irradiation with ultraviolet rays.
The pressure-sensitive adhesive sheet according to claim 1, wherein the base material and / or the second pressure-sensitive adhesive 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 base material and / or the second pressure-sensitive adhesive layer has an average transmittance of 50% or more at a wavelength of 400 nm or more and 700 nm or less. The pressure-sensitive adhesive sheet according to claim 2 or 3, wherein the base material and / or the second pressure-sensitive adhesive layer contains an ultraviolet absorber. 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. A first adhesive layer preparation step for 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 rays, and
A base material arranging step of arranging a base material on one surface of the first adhesive layer, and
A second adhesive layer arranging step of arranging the second adhesive layer is provided on one surface of the base material.
A method for producing an adhesive sheet, wherein the average transmittance of active light rays of the base material and / or the second adhesive layer is 15% or less. After the first adhesive layer preparation step and before the base material placement step,
The method for producing an adhesive sheet according to claim 6, wherein the first adhesive layer is irradiated with active light rays. The method for producing an adhesive sheet according to claim 6, wherein the first adhesive layer is irradiated with active light rays after the second adhesive layer arranging step. A preparatory step for preparing an adhesive sheet produced by the method for producing an adhesive sheet according to claim 8.
The first adhesive layer is irradiated with active light, and the first adhesive layer is exposed to a high-irradiated portion having a relatively high irradiation amount of active light and a relatively low irradiation amount of active light or active light. By forming the non-irradiated / low-irradiated portion, the visible light transmittance of the high-irradiated portion at a wavelength of 550 nm is made smaller than the visible light transmittance of the non-irradiated / low-irradiated portion at a wavelength of 550 nm. Irradiation process 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 first adhesive layer is irradiated with active light rays from the surface side of the second adhesive layer. The method for producing an intermediate laminate according to claim 10, wherein in the irradiation step, the first adhesive layer is irradiated with active light rays from the surface side of the first adhesive layer. The method for producing an intermediate laminate according to claim 11, wherein in the irradiation step, the first 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 14th aspect of the invention, 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 first adhesive layer is irradiated with the active rays. Method of manufacturing the intermediate laminate of. 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 rays, the first adhesive layer is irradiated with the active rays, so that the first adhesive layer is subjected to the first irradiation portion and the active rays. , The first irradiation step of forming a temporary non-irradiated portion not irradiated with active light rays,
After arranging a second mask that blocks active rays in the first irradiated portion, the temporary non-irradiated portion in the first adhesive layer is irradiated with active rays to irradiate the temporarily non-irradiated portion with the second irradiation. Equipped with a second irradiation step to make a part
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 first adhesive layer with active rays to make the entire first 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 a first adhesive layer, a base material arranged on one surface of the first adhesive layer, and a second adhesive layer arranged on one surface of the base material, and the other surface of the adhesive sheet. In preparation for the adherend placed in
The first 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 laminate having an average transmittance of active light rays of 15% or less for the base material and / or the second adhesive layer. 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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