Ultraviolet inspection tool, ultraviolet inspection kit, ultraviolet inspection method

Abstract

Provided is an ultraviolet inspection tool, an ultraviolet inspection kit, and an ultraviolet inspection method, which are excellent in chromogenicity of light having a wavelength of 222 nm even when the amount of light having a wavelength of 222 nm is small. The ultraviolet inspection tool of the present application has an ultraviolet sensing layer containing a chromogenic agent and an acid generator, the chromogenic agent has at least one selected from the group consisting of a lactone structure, a lactam structure, a sulfolactone structure, a sulfilactone structure, and ring-opened structures thereof, and an azobenzene structure, the acid generator has a molecular weight of 600 or less, and the mass ratio of the content of the acid generator to the content of the chromogenic agent is 1.01 to 40.00.

Description

Technical Field

[0001] This invention relates to an ultraviolet (UV) inspection tool, an UV inspection kit, and a UV inspection method. Background Technology

[0002] The determination of ultraviolet (UV) irradiation levels is carried out in various fields. Specific examples include the determination of UV irradiation levels on the irradiated object during the curing reaction of UV-curable resins and the determination of UV irradiation levels on the irradiated object during UV sterilization of food and other products.

[0003] On the other hand, in recent years, COVID-19 has become a major social problem.

[0004] In this context, as components relating to ultraviolet inspection tools, Patent Document 1 discloses "(a) a microcapsule containing a radiation-sensing composition comprising a colorless compound and (b) an organohalogen compound as essential components." and Patent Document 2 discloses "an ultraviolet-sensitive composition comprising a photoactive agent that generates free radicals upon ultraviolet irradiation, a color-changing agent that displays a visible color change through the action of the free radicals, and an ultraviolet absorber."

[0005] Previous technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2001-242249

[0008] Patent Document 2: Japanese Patent Application Publication No. 62-112020 Summary of the Invention

[0009] The technical problem to be solved by the invention

[0010] Since light with a wavelength of 222nm (ultraviolet light) is effective in desensitizing the novel coronavirus, it is possible to prevent infection by irradiating parts that are touched by an unspecified number of people, such as door handles and touch panels, with light of a wavelength of 222nm.

[0011] Therefore, an inspection tool is desired that can detect whether light with a wavelength of 222 nm has been emitted. Ideally, this tool would be suitable even in cases where the amount of light emitted at a wavelength of 222 nm is low (e.g., 1–3 mJ / cm²). 2 Even under conditions such as [etc.], it can still fully develop the color of ultraviolet light inspection tools.

[0012] The inventors, regarding the evaluation of the colorimetric properties of 222nm wavelength light on the inactivation of the novel coronavirus using an ultraviolet inspection tool with components described in Patent Documents 1 and 2, found that there is room for improvement in the colorimetric properties of 222nm wavelength light even with low irradiation levels.

[0013] The objective of this invention is to provide an ultraviolet inspection tool that exhibits excellent colorimetric properties for light with a wavelength of 222nm, even when the amount of light irradiated at a low wavelength of 222nm is low.

[0014] Furthermore, the objective of this invention is to provide an ultraviolet (UV) testing kit and a UV testing method.

[0015] means for solving technical problems

[0016] As a result of in-depth research to solve the above-mentioned problems, the inventors discovered that the problems could be solved by the structure shown below, and thus completed the present invention.

[0017] [1]

[0018] An ultraviolet inspection tool having an ultraviolet sensing layer comprising a colorant and an acid-generating agent.

[0019] The aforementioned color-developing agents have at least one selected from the group consisting of lactone structures, lactam structures, sulfonyl lactone structures, sultine structures and their open-ring structures, and azobenzene structures.

[0020] The molecular weight of the aforementioned acid-producing agents is below 600.

[0021] The mass ratio of the content of the above-mentioned acid-producing agent to the content of the above-mentioned color-developing agent is 1.01 to 40.00.

[0022] [2]

[0023] According to the ultraviolet inspection tool described in [1], the colorant comprises at least one selected from the group consisting of a compound represented by formula (I) described later, a compound represented by formula (II) described later, and their open-ring compounds.

[0024] [3]

[0025] According to the ultraviolet inspection tool described in [1], the color-developing agent comprises at least one selected from the group consisting of a compound represented by formula (I) described later, a compound represented by formula (III) described later, and their open-ring compounds.

[0026] The mass ratio of the content of the above-mentioned acid-producing agent to the content of the above-mentioned color-developing agent is 2.01 to 40.00.

[0027] [4]

[0028] According to the ultraviolet inspection tool described in [1], the colorant comprises at least one selected from the group consisting of a compound represented by formula (IV) described below and its closed-ring compound, and a compound represented by formula (V) described below.

[0029] [5]

[0030] The ultraviolet inspection tool according to any one of [1] to [4], wherein the acid-generating agent comprises a compound that generates at least one acid selected from the group consisting of HBr, HI, HPF6, HSbF6 and perfluorosulfonic acid.

[0031] [6]

[0032] The ultraviolet inspection tool according to any one of [1] to [5], wherein the acid-producing agent comprises at least one selected from the group consisting of organic halogen compounds, sulfonium salt compounds and iodine salt compounds.

[0033] [7]

[0034] According to the ultraviolet inspection tool described in [6], the acid-producing agent comprises at least one selected from the group consisting of compounds represented by formula (1) and triarylsulfonium salt compounds.

[0035] [8]

[0036] The ultraviolet inspection tool according to any one of [1] to [7], wherein the above-mentioned colorant has a maximum absorption wavelength in the wavelength range of 200 to 230 nm.

[0037] [9]

[0038] The ultraviolet inspection tool according to any one of [1] to [8], wherein the mass ratio of the content of the acid-producing agent to the content of the color-developing agent is 3.00 to 35.00.

[0039]

[10]

[0040] The ultraviolet inspection tool according to any one of [1] to [9] further comprises an adhesive.

[0041] The adhesives mentioned above do not actually have aromatic rings.

[0042]

[11]

[0043] The ultraviolet inspection tool according to any one of [1] to

[10] , wherein the ultraviolet sensing layer further comprises microcapsules,

[0044] The microcapsules contain the color-generating agent and the acid-producing agent mentioned above.

[0045]

[12]

[0046] According to any one of [1] to

[11] , the ultraviolet inspection tool, wherein the content of the colorant is 0.010 to 1.000 g / m² relative to the unit area of ​​the ultraviolet sensing layer. 2 .

[0047]

[13]

[0048] The ultraviolet inspection tool according to any one of [1] to

[12] is used to detect ultraviolet light with a wavelength of 180 to 230 nm.

[0049]

[14]

[0050] An ultraviolet inspection kit comprising any one of [1] to

[13] an ultraviolet inspection tool.

[0051]

[15]

[0052] An ultraviolet inspection method, wherein the ultraviolet inspection tool described in any one of [1] to

[13] is used to inspect ultraviolet light with a wavelength of 180 to 230 nm.

[0053] Invention Effects

[0054] According to the present invention, an ultraviolet inspection tool can be provided that exhibits excellent colorimetric properties for light with a wavelength of 222 nm, even when the amount of light irradiated is low.

[0055] Furthermore, according to the present invention, an ultraviolet detection kit and an ultraviolet detection method can be provided. Attached Figure Description

[0056] Figure 1 This is a schematic cross-sectional view illustrating an example of the ultraviolet inspection tool of the present invention. Detailed Implementation

[0057] The present invention will now be described in detail.

[0058] The description of the constituent elements of the present invention described below is sometimes carried out according to representative embodiments of the present invention, but the present invention is not limited to these embodiments.

[0059] In this specification, the numerical range indicated by “~” refers to the range encompassed by the values ​​recorded before and after “~” as the lower and upper limits.

[0060] In the numerical ranges described in this specification, the upper or lower limit of a certain numerical range can be replaced with the upper or lower limit of another numerical range described in a different period. Furthermore, in the numerical ranges described in this specification, the upper or lower limit of a certain numerical range can be replaced with the values ​​shown in the embodiments.

[0061] In this specification, "solid component" refers to the component that forms the composition layer (e.g., an ultraviolet sensing layer) formed using the composition, and when the composition (e.g., a composition for forming an ultraviolet sensing layer) contains a solvent (e.g., an organic solvent and water), it refers to all components other than the solvent. Furthermore, liquid components are also considered solid components as long as they form the composition layer (e.g., an ultraviolet sensing layer).

[0062] In this specification, "ultraviolet light" refers to light with wavelengths in the range of 10 to 400 nm.

[0063] In this specification, "(meth)acrylic acid" refers to at least one of acrylic acid and methacrylic acid.

[0064] In this specification, "boiling point" refers to the boiling point at standard atmospheric pressure.

[0065] [Ultraviolet Inspection Tool]

[0066] The ultraviolet inspection tool of the present invention has an ultraviolet sensing layer comprising a colorant and an acid-generating agent, wherein the ultraviolet inspection tool,

[0067] The color-developing agent has at least one selected from the group consisting of lactone structures, lactam structures, sulfonyl lactone structures, sulfinolone structures and their open-ring structures, and azobenzene structures.

[0068] The molecular weight of the aforementioned acid-producing agents is below 600.

[0069] The mass ratio of the content of the above-mentioned acid-producing agent to the content of the above-mentioned color-developing agent is 1.01 to 40.00.

[0070] Hereinafter, a color-developing agent having at least one selected from the group consisting of a lactone structure, a lactam structure, a sulcolone structure, a sulfinolone structure and their open-ring structures, and an azobenzene structure is also referred to as a "specific color-developing agent". Furthermore, an acid-producing agent with a molecular weight of 600 or less is also referred to as a "specific acid-producing agent".

[0071] The detailed mechanism by which the ultraviolet inspection tool of the present invention exhibits excellent colorimetric properties for low-dose light with a wavelength of 222 nm is not yet clear, but the inventors speculate as follows.

[0072] As a feature of the present invention, for example, it may include a specific color-developing agent and a specific acid-generating agent, wherein the mass ratio of the content of the specific acid-generating agent to the content of the specific color-developing agent is within a specified range.

[0073] Conventionally, color-developing agents are typically used in large quantities to improve their color development for ultraviolet light with wavelengths such as 254 nm and 365 nm. However, the inventors have discovered that color-developing agents themselves absorb a large amount of light with a wavelength of 222 nm. Therefore, depending on the amount of color-developing agent, even with low irradiation levels, the color development will decrease.

[0074] Therefore, the inventors have discovered through in-depth research that when a specific color-producing agent and a specific acid-producing agent are contained, and the mass ratio of the content of the specific acid-producing agent to the content of the specific color-producing agent is 1.01 to 40.00, the color development is excellent even when irradiated with light of wavelength 222 nm, even with a small amount of irradiation.

[0075] The reasons are not yet clear, but the inventors make the following conjectures.

[0076] First, it is believed that in the main color-developing mechanism of the present invention, a specific acid-producing agent absorbs ultraviolet light and is activated to produce acid. The color-developing agent reacts with the produced acid, etc., as described later, and the structure of the color-developing agent changes, and its color changes.

[0077] More specifically, the specific color-developing agents used in this invention, as described below, have a defined structure that can be reversibly changed. For example, a specific color-developing agent X having the following lactone structure, as shown in the following scheme, can become a substantially colorless closed-ring form and a colored open-ring form. More specifically, in the specific color-developing agent X, the lactone structure is formed by an acid (H... +The specific chromophore X undergoes ring-opening action to become an open-ring form, and then ring-closes through deoxygenation to become a closed-ring form. When an acid is supplied to the closed-ring form of this specific chromophore X, a reaction occurs from the closed-ring form to the open-ring form, and also a reaction occurs from the open-ring form to the closed-ring form. That is, the reaction from the closed-ring form to the open-ring form and the reaction from the open-ring form to the closed-ring form proceed reversibly. In this invention, the mass ratio of the content of the specific acid-producing agent to the content of the specific chromophore X is 1.01 or more. Since there is a large amount of acid that can react with the specific chromophore X, the reaction from the closed-ring form to the open-ring form is more likely to occur. In other words, the balance between the reaction from the closed-ring form to the open-ring form and the reaction from the open-ring form to the closed-ring form is more biased towards the reaction from the closed-ring form to the open-ring form. Therefore, it is believed that even a relatively small amount of the specific chromophore X can easily promote the generation of the open-ring form that displays color, and the color development is improved. Furthermore, it is believed that by relatively reducing the amount of a specific chromophore X, the absorption of light based on the specific chromophore X itself can be suppressed. As a result, acid is effectively generated by a specific acid-producing agent, thereby improving the color development. In addition, when the mass ratio disclosed in the prior art is less than 1.01, the bias of the reaction from the closed-ring to the open-ring is insufficient, resulting in poor color development.

[0078] Furthermore, it is speculated that when the mass ratio is below 40.0, the amount of a specific colorant will not be too small, resulting in excellent color concentration.

[0079] [Chemical Formula 1]

[0080]

[0081] Furthermore, while compounds with lactone structures have been described in detail above, the same mechanism has been hypothesized for compounds with other structures.

[0082] For example, a specific chromophore Y having the following sulfonyl lactone structure, as shown in the following scheme, can be a blue open-ring form and a yellow closed-ring form. More specifically, the specific chromophore Y is obtained by acid (H... + The specific chromophore Y undergoes a ring-closure reaction to become a closed-ring form, and then undergoes a ring-opening reaction via deoxygenation. When an acid is supplied to the ring-open form of this specific chromophore Y, a reaction occurs from the ring-open form to the closed-ring form, and also a reaction occurs from the closed-ring form to the ring-open form. That is, the reaction from the ring-open form to the closed-ring form and the reaction from the closed-ring form to the ring-open form proceed reversibly. In this invention, the mass ratio of the specific acid-producing agent to the specific chromophore Y is 1.01 or more. Because the amount of acid that can react with the specific chromophore Y is large, the reaction from the ring-open form to the closed-ring form is more likely to occur. In other words, the equilibrium between the reaction from the ring-open form to the closed-ring form and the reaction from the closed-ring form to the ring-open form is more biased towards the reaction from the ring-open form to the closed-ring form. As a result, excellent color development is achieved.

[0083] [Chemical Formula 2]

[0084]

[0085] Furthermore, a specific color-developing agent Z having the following azobenzene structure, as shown in the following scheme, can become an azo body displaying yellow and an hydrazone body displaying orange to pink. More specifically, the specific color-developing agent Z is obtained by acid (H... + The acid-producing agent Z reacts to form a hydrazone, and then undergoes deoxygenation to form an azo body. When an acid is supplied to the azo body of this specific chromophore Z, a reaction occurs from the azo body to the hydrazone, and also from the hydrazone to the azo body. That is, the reaction from the azo body to the hydrazone and the reaction from the hydrazone to the azo body proceed reversibly. In this invention, the mass ratio of the specific acid-producing agent to the specific chromophore Z is 1.01 or more. Because the amount of acid that can react with the specific chromophore Z is large, the reaction from the azo body to the hydrazone is more likely to occur. In other words, the equilibrium between the reaction from the azo body to the hydrazone and the reaction from the hydrazone to the azo body is more biased towards the reaction from the azo body to the hydrazone. As a result, excellent color development is achieved.

[0086] [Chemical Formula 3]

[0087]

[0088] Hereinafter, the case where the color rendering properties of light with a wavelength of 222nm are superior even when the amount of light irradiated at a low wavelength of 222nm is also referred to as "the effect of the present invention is superior".

[0089] The shape of the ultraviolet inspection tool can be sheet-like, or it can be a block shape such as a cuboid or cylinder. Among these, sheet-like ultraviolet inspection tools, namely ultraviolet inspection sheets, are preferred.

[0090] Furthermore, the shape of the sheet-like ultraviolet inspection tool can be various, including polygons other than quadrilaterals such as squares, rectangles, circles, ellipses, and hexagons, as well as irregular shapes. The sheet-like ultraviolet inspection tool can also be elongated.

[0091] Ultraviolet (UV) inspection tools may have other components. When UV inspection tools have other components, the UV inspection tool can be attached to the other components via an adhesive layer (e.g., adhesives and bonding agents), or it can be manufactured as part of the other components. Examples of other components include business cards, labels, masks, fabric products (e.g., shirts), casings (e.g., smartphone casings), and paper products (e.g., notebooks and calendars).

[0092] If the ultraviolet (UV) sensing layer in a UV inspection tool receives UV radiation during UV irradiation measurement, the color intensity or color in the irradiated area (UV-irradiated area) will change according to the UV radiation intensity (e.g., cumulative illuminance). The change in color intensity and color corresponding to the UV radiation intensity refers to the color-gradient property of the color-emitting area corresponding to the UV radiation intensity.

[0093] The following is a detailed description of the specific implementation method of the ultraviolet inspection tool.

[0094] As an embodiment of the ultraviolet inspection tool, the first embodiment or the second embodiment described later is preferred.

[0095] Ultraviolet inspection tools may contain microcapsules, preferably microcapsules containing specific color-developing agents and specific acid-producing agents.

[0096] <<First Embodiment>>

[0097] The first embodiment of the ultraviolet inspection tool does not include the microcapsules described later.

[0098] Figure 1 This is a schematic cross-sectional view of an example of an ultraviolet inspection tool.

[0099] A first embodiment of the ultraviolet inspection tool 10 includes a support 12 and an ultraviolet sensing layer 14 disposed on one surface of the support 12. The ultraviolet sensing layer 14 contains a specific color-developing agent and a specific acid-generating agent. In the ultraviolet sensing layer 14 that receives ultraviolet irradiation, a color-developing portion (not shown) is formed with a color-developing concentration corresponding to the amount of ultraviolet irradiation.

[0100] As mentioned above, in Figure 1 The image shows a sheet-like method for using ultraviolet inspection tools, but it is not limited to this method.

[0101] In addition, as will be described later, the ultraviolet inspection tool 10 may or may not have a support body 12, as long as it has an ultraviolet sensing layer 14.

[0102] also, Figure 1 The ultraviolet inspection tool 10 shown has a two-layer structure of support 12 and ultraviolet sensing layer 14, but it is not limited to this method. As will be described later, it may also have other layers besides support 12 and ultraviolet sensing layer 14 (such as reflective layer, gloss layer and filter layer).

[0103] The thickness of the ultraviolet inspection tool 10 is preferably 5μm to 1cm, more preferably 25μm to 2mm.

[0104] Hereinafter, the components of the first embodiment of the ultraviolet inspection tool will be described in detail.

[0105] [Ultraviolet Sensing Layer]

[0106] The ultraviolet inspection tool has an ultraviolet sensing layer.

[0107] The ultraviolet sensing layer contains specific colorants and specific acid-producing agents.

[0108] The following is a detailed description of the various components that can be included in the ultraviolet sensing layer.

[0109] <Specific colorant>

[0110] The ultraviolet sensing layer contains a specific colorant.

[0111] "Color-developing agent" refers to a compound that colors, changes color, or removes color.

[0112] In other words, "color development" encompasses the concepts of coloring, color change, and color fading. "Coloring" refers to applying color from a substantially colorless state (colorless or a pale color). "Color change" refers to a color transformation from a specific color to a color different from that specific color (e.g., a color change from yellow to red). Furthermore, "color fading" refers to a transformation from a specific color to a substantially colorless state (colorless or a pale color).

[0113] Certain colorants are preferably developed through the action of acids.

[0114] The acid that produces color when acting on a specific color-producing agent can be an acid produced by a specific acid-producing agent, or it can be an acid other than an acid produced by a specific acid-producing agent.

[0115] Whether a particular colorant develops color through the action of acid can be determined, for example, by the following methods.

[0116] The UV-sensing layer before light irradiation was cut from a UV inspection tool and immersed in methanol for 2 days to obtain methanol solution A from which the chromogenic agent was extracted. Subsequently, methanol solution A was analyzed by liquid chromatography (Analysis 1). During the immersion of the UV-sensing layer in methanol, a cap was placed to prevent methanol evaporation.

[0117] On the other hand, 0.01 mol / L (1N) hydrochloric acid was added to methanol solution A to adjust the pH to 1, and the solution was analyzed by liquid chromatography in the same manner as in Analysis 1 (Analysis 2).

[0118] Compare the data (maximum absorption wavelength) obtained from Analysis 1 with the data (maximum absorption wavelength) obtained from Analysis 2 to confirm whether the maximum absorption wavelength has changed. If it has changed, it indicates color development via acid. The maximum absorption wavelength change is preferably greater than 10 nm. Furthermore, there are many instances where a visible color change is observed before and after adjusting the pH to 1 with 0.01 mol / L (1N) hydrochloric acid.

[0119] In addition, the determination conditions for liquid chromatography are as follows.

[0120] Device: Nexera (manufactured by Shimadzu Corporation)

[0121] Column: Capcell pak C18 UG-120

[0122] Eluent: Water / Methanol

[0123] Oven: 40℃

[0124] Injection: 5μL

[0125] Flow rate: 0.2 mL / min

[0126] A particular color-developing agent has at least one selected from the group consisting of lactone structure, lactam structure, sulcolone structure, sulfinolone structure and their open-ring structures, and azobenzene structure.

[0127] Most of the specific acid-producing agents are oil-soluble. From the viewpoint that the specific color-producing agent and the specific acid-producing agent can react easily when mixed, it is preferable that the specific color-producing agent is also oil-soluble.

[0128] Furthermore, from the same viewpoint as above, a particular color-developing agent is more preferably having at least one selected from the group consisting of lactone structures, lactam structures and their open-ring structures, and even more preferably having a phthalide structure or an isoindolin-1-one structure.

[0129] Where isomers (e.g., structural isomers and stereoisomers) are present in the compounds disclosed in this specification, the compounds contain such isomers unless otherwise stated. For example, the term "azobenzene structure" means that the compounds contain both the azobenzene structure and its tautomers (e.g., hydrazone structures). Furthermore, the compounds represented by formula (V) described later, unless otherwise stated, also include compounds having the tautomers of the compounds represented by formula (V).

[0130] Colorless pigments are preferred as specific color-generating agents.

[0131] Examples of colorless pigments include triarylmethane phthalide compounds having a triarylmethane structure and a phthalide structure, fluorane compounds having a xanthonium structure and a phthalide structure, indoleyl phthalide compounds having an indoleyl structure and a phthalide structure, aza-indoleyl phthalide compounds having an azidoindoleyl structure and a phthalide structure, and rhodamine lactam compounds having a xanthonium structure and a lactam structure.

[0132] The specific color-developing agent preferably comprises at least one selected from the group consisting of fluorane compounds, indolephthalide compounds, azidoindolephthalide compounds, and rhodamine lactam compounds, and more preferably comprises indolephthalide compounds.

[0133] The specific color-developing agent preferably comprises at least one selected from the group consisting of the compound represented by formula (I), the compound represented by formula (II), and their open-ring compounds.

[0134] [Chemical Formula 4]

[0135]

[0136] In formula (I), Ar a1 and Ar a2 Each can independently represent an aromatic ring that may have substituents. R a1 and R a2 Each can be independently represented as an alkyl group that may have substituents. R a3 Indicates a substituent. X a1 Indicates -O- or -NR a4 -. R a4 It represents a hydrogen atom, an alkyl group that may have substituents, or an aryl group that may have substituents. na represents an integer from 0 to 4.

[0137] In equation (II), R b1 and R b3 Each can independently represent a hydrogen atom, an alkyl group that may have substituents, or an aryl group that may have substituents. R b2 and R b4 Each can be independently represented as an alkyl group that may have substituents or an aryl group that may have substituents. X b1 Indicates -NR b5 -. R b5 It represents a hydrogen atom, an alkyl group that may have substituents, or an aryl group that may have substituents.

[0138] Ar a1 and Ar a2 Each can be represented independently as an aromatic ring that may have substituents. Additionally, Ar... a1 and Ar a2 The aromatic rings represented above each contain the two carbon atoms (C=C) described in formula (I).

[0139] The aromatic rings that can have substituents can be either monocyclic or polycyclic.

[0140] Examples of aromatic rings that can have substituents include aromatic hydrocarbon rings and aromatic heterocycles that can have substituents, with aromatic heterocycles that can have substituents being preferred.

[0141] Examples of substituents that can be present in the aforementioned aromatic ring that may have substituents include alkyl, aryl, and heteroaryl groups, with alkyl groups being preferred. These groups may further have substituents. Additionally, the aforementioned substituents are excluding R. a1 and R a2 Other than groups.

[0142] The alkyl group can be any of the following: straight-chain, branched, and cyclic, preferably straight-chain or branched.

[0143] The number of carbon atoms in the alkyl group is preferably 1 to 20, more preferably 5 to 10.

[0144] The number of ring members of the aromatic ring that may have substituents is preferably 6 to 30, more preferably 6 to 18, and even more preferably 6 to 12.

[0145] Examples of aromatic rings that may have substituents include, for instance, aromatic hydrocarbon rings such as benzene rings, naphthalene rings, anthracene rings, and phenanthrene rings; and aromatic heterocycles such as indole rings, pyrrole rings, pyrazole rings, triazole rings, pyridine rings, pyrazine rings, pyrimidine rings, pyridazine rings, thiophene rings, furan rings, pyran rings, thiazole rings, oxazole rings, selenophenol rings, and imidazole rings. Aromatic heterocycles that may have substituents are preferred, and indole rings that may have substituents are more preferred.

[0146] Ar a1 and Ar a2 It can be any of the same group or different groups, preferably representing the same group.

[0147] R a1 and R a2 Each can be independently represented as an alkyl group that may have substituents.

[0148] The alkyl groups that may have substituents can be any of the following: straight-chain, branched, and cyclic.

[0149] The number of carbon atoms in the alkyl group that may have substituents is preferably 1 to 10, more preferably 1 to 3.

[0150] Examples of substituents that can be present in the aforementioned alkyl groups include aryl and heteroaryl groups. Furthermore, it is preferable to use unsubstituted alkyl groups (unsubstituted alkyl groups).

[0151] The compound represented by formula (I) has R at a specified position. a1 and R a2 .

[0152] It is believed that by having R at the specified position a1 and R a2 It is difficult to carry out the deoxygenation reaction from open ring to closed ring, so the reaction from closed ring to open ring is carried out effectively, resulting in better performance of the present invention.

[0153] In formula (I), X is included. a1 The 5-membered ring and Ar a1 and Ar a2 This represents aromatic ring bonding that can have substituents. In Ar a1 and Ar a2 In the aromatic ring that can have substituents, R a1 and R a2 It is bonded to the carbon atom adjacent to the carbon atom (the ring member atom of each ring) that forms the above bond.

[0154] The following provides a detailed description of compounds (A) and (B). Compound (A) corresponds to the compound represented by formula (I), while compound (B) does not correspond to the compound represented by formula (I). In compound A, R in formula (I) a1 and R a2 Corresponding to methyl. That is, in formula (I), R a1 and R a2 This refers to the position of the methyl group in compound (A). Furthermore, compound (B) does not have an R group at the specified position. a1 and R a2 Therefore, it does not correspond to the compound represented by formula (I).

[0155] [Chemical Formula 5]

[0156]

[0157] R a3 Indicates a substituent.

[0158] Examples of substituents mentioned above include halogen atoms, cyano groups, nitro groups, carboxyl groups, alkyl groups, aryl groups, and groups formed by combining them. Multiple R groups exist. a3 In the case of R a3 They can be the same or different.

[0159] X a1 Indicates -O- or -NR a4 -. R a4It represents a hydrogen atom, an alkyl group that may have substituents, or an aryl group that may have substituents.

[0160] As X a1 , preferred -O-.

[0161] As an alkyl group that can have substituents, examples of R mentioned above are... a1 and R a2 The alkyl group represented may have substituents.

[0162] The aryl groups that can have substituents can be either monocyclic or polycyclic.

[0163] The number of carbon atoms in the aryl group that may have substituents is preferably 6 to 20.

[0164] Examples of substituents that can be present in the alkyl group and the aryl group mentioned above include R. a3 The substituents represented.

[0165] na represents an integer from 0 to 4.

[0166] As na, it is preferably an integer from 0 to 2, more preferably 0. In other words, the compound represented by formula (I) preferably does not have R. a3 .

[0167] As for the compound represented by formula (I), the compound represented by formula (IA) is preferred.

[0168] [Chemical Formula 6]

[0169]

[0170] In formula (IA), R a22 and R a24 Each can be independently represented as an alkyl group that may have substituents. R a21 and R a23 Each can be represented independently by a hydrogen atom or an alkyl group that may have substituents. X a21 Indicates -O- or -NR a25 R a25 It represents a hydrogen atom, an alkyl group that may have substituents, or an aryl group that may have substituents.

[0171] R a22 and R a24 Each can be independently represented as an alkyl group that may have substituents. R a21 and R a23 Each can be represented independently as a hydrogen atom or an alkyl group that may have substituents.

[0172] As an alkyl group that can have substituents as described above, Ar can be cited as an example. a1and Ar a2 The aromatic ring represented can have alkyl groups that can have substituents. As R a21 and R a23 Preferably, the alkyl group may have a substituent, and more preferably, the alkyl group may have no substituent (unsubstituted alkyl group).

[0173] R a22 and R a24 The meaning of alkyl groups that can have substituents is the same as that of R above. a1 and the above R a2 They are the same, and the preferred range is also the same.

[0174] X a21 Indicates -O- or -NR a25 R a25 It represents a hydrogen atom, an alkyl group that may have substituents, or an aryl group that may have substituents.

[0175] As X a21 and R a25 The meanings are respectively the same as those of X above. a1 and R a4 They are the same, and the preferred range is also the same.

[0176] The compounds represented by formula (II) will be described in detail below.

[0177] R b1 and R b3 Each can independently represent a hydrogen atom, an alkyl group that may have substituents, or an aryl group that may have substituents. R b2 and R b4 Each can be independently represented as an alkyl group that may have substituents or an aryl group that may have substituents.

[0178] The alkyl group that can have substituents can be any of the following: straight-chain, branched, and cyclic, preferably straight-chain or branched.

[0179] The number of carbon atoms in the alkyl group that may have substituents is preferably 1 to 10, more preferably 1 to 5.

[0180] The above can be aryl groups with substituents, for example, the above R can be cited as an example. a4 The aryl group represented can have substituents.

[0181] Examples of substituents that can be present in the alkyl group and the aryl group mentioned above include R. a3 The substituents represented.

[0182] As R b1 ~R b4Preferably, the alkyl group may have a substituent, and more preferably, the alkyl group may have no substituent (unsubstituted alkyl group).

[0183] X b1 Indicates -NR b5 -. R b5 It represents a hydrogen atom, an alkyl group that may have substituents, or an aryl group that may have substituents.

[0184] As R b5 The meaning is the same as the above R. a4 They are the same, and the preferred range is also the same.

[0185] The specific colorant also preferably includes at least one of the compounds selected from the group consisting of the compound represented by formula (I), the compound represented by formula (III), and their open-ring compounds.

[0186] [Chemical Formula 7]

[0187]

[0188] In equation (III), Ar c1 This indicates an aromatic ring that can have substituents. R c1 Represents a hydrogen atom, an alkyl group that may have substituents, or an aryl group that may have substituents. R c2 This indicates an alkyl group that may have substituents or an aryl group that may have substituents. X c1 Indicates -O- or -NR c3 -. R c3 It represents a hydrogen atom, an alkyl group that may have substituents, or an aryl group that may have substituents.

[0189] Ar c1 This indicates that an aromatic ring can have substituents.

[0190] The aromatic rings that can have substituents can be either monocyclic or polycyclic.

[0191] Examples of aromatic rings that can have substituents include aromatic hydrocarbon rings and aromatic heterocycles that can have substituents, with aromatic hydrocarbon rings that can have substituents being preferred.

[0192] Examples of substituents that can be present in the aforementioned aromatic rings that may have substituents include alkyl groups and -NR groups. N1 R N2 aryl and heteroaryl, preferably alkyl or -NR N1 R N2 R N1 and R N2 Each can be independently represented by a hydrogen atom, an alkyl group that may have substituents, or an aryl group that may have substituents.

[0193] The alkyl group can be any of the following: straight-chain, branched, and cyclic, preferably straight-chain or branched.

[0194] The number of carbon atoms in the alkyl group is preferably 1 to 20, more preferably 1 to 5.

[0195] The number of ring members of the aromatic ring that may have substituents is preferably 6 to 30, more preferably 6 to 18, and even more preferably 6 to 12.

[0196] Examples of aromatic rings that may have substituents include, for instance, aromatic hydrocarbon rings that may have substituents, such as benzene rings, naphthalene rings, anthracene rings, and phenanthrene rings; and aromatic heterocycles that may have substituents, such as indole rings, pyrrole rings, pyrazole rings, triazole rings, pyridine rings, pyrazine rings, pyrimidine rings, pyridazine rings, thiophene rings, furan rings, pyran rings, thiazole rings, oxazole rings, selenophenol rings, and imidazole rings. Aromatic hydrocarbon rings that may have substituents are preferred, and benzene rings that may have substituents are more preferred.

[0197] R c1 Represents a hydrogen atom, an alkyl group that may have substituents, or an aryl group that may have substituents. R c2 This indicates an alkyl group that may have substituents or an aryl group that may have substituents.

[0198] As an alkyl group that can have substituents, examples of R mentioned above are... b1 The alkyl group is represented.

[0199] As R c1 and R c2 Preferably, it is a straight-chain or branched alkyl group without substituents.

[0200] X c1 Indicates -O- or -NR c3 -. R c3 It represents a hydrogen atom, an alkyl group that may have substituents, or an aryl group that may have substituents.

[0201] X c1 and R c3 The meanings are respectively the same as those of X above. a1 and the above R a4 They are the same, and the preferred range is also the same.

[0202] The specific color-developing agent also preferably comprises at least one of the compounds selected from the group consisting of compounds represented by formula (IV) and their closed-ring compounds, and compounds represented by formula (V).

[0203] [Chemical Formula 8]

[0204]

[0205] In equation (IV), Rd1 and R d2 Each can be represented independently by a halogen atom or an alkyl group that may have substituents. R d3 COO - M d + or SO3 - M d + M d + This represents a cation. nd1 and nd2 independently represent integers from 0 to 4.

[0206] In equation (V), R e1 and R e2 Each can be independently represented as an alkyl group that may have substituents. R e3 COO - M e + or SO3 - M e + M e + It represents a cation. ne represents 0 or 1.

[0207] R d1 and R d2 Each can be represented independently as a halogen atom or an alkyl group that may have substituents.

[0208] Chlorine or bromine atoms are preferred as the halogen atom mentioned above.

[0209] The alkyl groups that may have substituents can be any of the following: straight-chain, branched, and cyclic.

[0210] The number of carbon atoms in the alkyl groups that can have substituents mentioned above is mostly between 1 and 10.

[0211] R d3 COO - M d + or SO3 - M d + M d + It represents a cation.

[0212] Examples of cations mentioned above include well-known cations, specifically H+. + Monovalent cations, including protons, monovalent organic cations, and monovalent inorganic cations, are preferred, especially K. + Or Na + .

[0213] nd1 and nd2 independently represent integers from 0 to 4.

[0214] nd1 and nd2 can be the same or different, but it is preferred that they represent the same integer.

[0215] The compound represented by formula (V) will be described in detail below.

[0216] R e1 and R e2 Each can be independently represented as an alkyl group that may have substituents.

[0217] As R e1 and R e2 For example, the above R can be cited. d1 and the above R d2 The alkyl group represented may have substituents.

[0218] R e3 COO - M e + or SO3 - M e + M e + It represents a cation.

[0219] M e + The meaning of M above d + The methods are the same, and the preferred methods are also the same.

[0220] ne represents 0 or 1.

[0221] Examples of specific color-developing agents include 3,3-bis(2-methyl-1-octyl-3-indolyl)phthalide, 6'-(dibutylamino)-2'-bromo-3'-methylspiro[phthalide-3,9'-xanthine], 3-(4-diethylamino-2-ethoxyphenyl)-3-(1-ethyl-2-methylindol-3-yl)-4-azaphthalide, and 3-(4-diethylamino-2-ethoxyphenyl)- 3-(1-n-octyl-2-methylindole-3-yl)phthalide, 3-[2,2-bis(1-ethyl-2-methylindole-3-yl)vinyl]-3-(4-diethylaminophenyl)phthalide, 2-anilino-6-dibutylamino-3-methylfluorane, 6-diethylamino-3-methyl-2-(2,6-dimethylphenylamino)fluorane, 2-(2-chloroanilino)-6-dibutylamino Fluorane, 2-anilino-6-diethylamino-3-methylfluorane, 9-[ethyl(3-methylbutyl)amino]spiro[12H-benzo[a]xanthan-12,1'(3'H)isobenzofuran]-3'-one, 2'-methyl-6'-(N-p-tolyl-N-ethylamino)spiro[isobenzofuran-1(3H),9'-[9H]xanthan]-3-one, 3',6'-bis(diethyl) (amino)-2-(4-nitrophenyl)spiro[isoindol-1,9'-xanthon]-3-one, 9-(N-ethyl-N-isopentylamino)spiro[benzo[a]xanthon-12,3'-phthalide], 2'-anilino-6'-(N-ethyl-N-isopentylamino)-3'-methylspiro[phthalide-3,9'-[9H]xanthon] and 6'-(diethylamino)-1',3'-dimethylfluorane.

[0222] Examples of compounds represented by formula (IV) above include open-ring compounds of compounds having a sulfonyl lactone ring, such as phenol red, thymol blue, bromothymol blue, bromocresol green, and bromocresol purple; and open-ring compounds of compounds having a lactone ring, such as phenolphthalein and thymolphthalein.

[0223] Examples of compounds represented by the above formula (V) include compounds with an azobenzene structure such as methyl yellow, methyl orange, and methyl red.

[0224] As a specific colorant, examples include U.S. Patent No. 3,445,234, Japanese Patent Application Publication No. 5-257,272, and International Publication No. 2009 / 008248, paragraphs 0029 to 0034.

[0225] The maximum absorption wavelength of a particular colorant is mostly in the wavelength range of 190 to 400 nm, preferably in the wavelength range of 200 to 300 nm, and more preferably in the wavelength range of 200 to 230 nm.

[0226] The molecular weight of the specific color-developing agent is preferably 300 or more, more preferably 500 or more. The upper limit is preferably 2000 or less, more preferably 1000 or less.

[0227] There are no particular restrictions on the hue of a specific color-developing agent, but from a visibility point of view, it is preferred that the specific color-developing agent produce a reddish hue (e.g., red, magenta, and orange). Specifically, the L color, standardized by the CIE color system... * a * b * a in * Preferably, the value is greater than 0. L. * a * b * Measurements can be performed using JIS Z 8781-4:2013 as a reference and with a Spectrolino spectrophotometer (manufactured by Gretag Macbeth).

[0228] A specific colorant can be used alone or in combination with two or more.

[0229] The content of a specific colorant is preferably 0.010–1.000 g / m² relative to the unit area of ​​the ultraviolet sensing layer. 2 More preferably 0.020~0.600g / m 2 Further optimization was performed using 0.020–0.140 g / m³. 2 .

[0230] It is speculated that by setting the content of the specific chromophore to the above range, excessive absorption of light with a wavelength of 222nm based on the specific chromophore is suppressed, thus the chromophore properties for light with a wavelength of 222nm are excellent even under low irradiation.

[0231] The content of a specific colorant can be determined by the following methods.

[0232] The amount of methanol can be calculated by cutting a UV-sensing layer from a UV inspection tool, immersing the UV-sensing layer in methanol for 2 days, and then analyzing the obtained methanol using liquid chromatography. Furthermore, methanol evaporation is avoided during the immersion of the UV-sensing layer. Additionally, a calibration curve for the content of the specific chromogenic agent being detected is prepared using the same measurement conditions as the liquid chromatography determination. The liquid chromatography measurement conditions are as follows.

[0233] Device: Nexera (manufactured by Shimadzu Corporation)

[0234] Column: Capcell pak C18 UG-120

[0235] Eluent: Water / Methanol

[0236] Oven: 40℃

[0237] Injection: 5μL

[0238] Detection: The wavelength of maximum absorption of the specific chromophore being detected.

[0239] Flow rate: 0.2 mL / min

[0240] <Specific acid-producing agents>

[0241] The ultraviolet sensing layer contains a specific acid-producing agent.

[0242] Specific acid-producing agents are those with a molecular weight of less than 600.

[0243] The molecular weight of the specific acid-producing agent is 600, preferably 200 to 600, and more preferably 300 to 500. From the viewpoint of increasing the number of moles of acid produced per unit mass of the specific acid-producing agent, a smaller molecular weight of the specific acid-producing agent is preferred. On the other hand, from the viewpoint of storage stability, a molecular weight of 200 or higher of the specific acid-producing agent is preferred.

[0244] "Acid-producing agents" are compounds that can produce acids.

[0245] The specific acid-producing agent is preferably a compound that generates acid through photoactivation. For example, it is preferable for the acid generated by the specific acid-producing agent activated by photoactivation to act on the specific chromophore to cause the chromophore to develop color, and more preferably for the acid generated by the specific acid-producing agent activated by ultraviolet light (especially light with a wavelength of 222 nm) to act on the specific chromophore to cause the chromophore to develop color.

[0246] The acid produced by a specific acid-producing agent can be any of organic acids such as carboxylic acids or inorganic acids, with inorganic acids being preferred.

[0247] Examples of such inorganic acids include hydrogen halides, sulfonic acids, sulfuric acid, and nitric acid.

[0248] From the viewpoint of achieving superior effects, the specific acid-producing agent preferably comprises a compound that produces at least one acid selected from the group consisting of HBr, HI, HPF6, HSbF6, and perfluorosulfonic acid; more preferably, it comprises a compound that produces at least one acid selected from the group consisting of HBr and HI; and even more preferably, it comprises a compound that produces HBr. Furthermore, since the aforementioned acids are strong acids, the effects of the present invention are considered to be superior.

[0249] As specific acid-producing agents, examples include nonionic acid-producing agents and ionic acid-producing agents.

[0250] As a specific acid-producing agent, it is preferred to include at least one selected from the group consisting of organic halogen compounds, sulfonium salt compounds and iodine salt compounds, more preferably at least one selected from the group consisting of compounds represented by formula (1) described below and triaryl sulfonium salt compounds, and even more preferably compounds represented by formula (1).

[0251] The compounds represented by formula (1) and triarylsulfonium salts have low absorption of light with wavelengths above 300 nm, and therefore do not readily produce color under fluorescent lamps. For example, when measuring ultraviolet irradiation using ultraviolet testing tools, measurements are often taken under fluorescent lamps. In such cases, when the acid colorant reacts to produce color within the wavelength range of fluorescent lamps, it may be impossible to accurately measure light with a target wavelength of 222 nm.

[0252] Therefore, when the specific acid-producing agent is set as the above-mentioned compound, even if the content of the specific acid-producing agent is increased, it is possible to suppress the color emission of light with wavelengths above 300 nm, and the color emission of light with a target wavelength of 222 nm becomes better.

[0253] (Nonionic acid-producing agent)

[0254] Examples of nonionic acid-producing agents include organohalogen compounds, oxime compounds, and diazo compounds.

[0255] From the viewpoint of achieving better results with the present invention, the organohalogen compound is preferably a compound having three or more halogen atoms per molecule. The upper limit for the number of halogen atoms is preferably nine or less, more preferably five or less.

[0256] As an organohalogen compound, the compound represented by formula (1) or the compound represented by formula (2) is preferred, and the compound represented by formula (1) is more preferred.

[0257] R 1 -L 1 -CX 1 X 2 X 3 ……(1)

[0258] In equation (1), R 1 This indicates an aryl group that may have substituents or a heteroaryl group that may have substituents. L 1 Indicates -SO- or -SO2-. X 1 ~X 3 Each can be represented independently as either a hydrogen atom or a halogen atom. Where X... 1 ~X 3 Except for the case where all atoms are hydrogen atoms.

[0259] R 1This indicates an aryl group that may have substituents or a heteroaryl group that may have substituents.

[0260] The number of carbon atoms in the aryl group that may have substituents is preferably 6 to 20, more preferably 6 to 14, and even more preferably 6 to 10.

[0261] The number of carbon atoms in the heteroaryl group that may have substituents is preferably 4 to 20, more preferably 4 to 13, and even more preferably 4 to 9.

[0262] Examples of substituents that can be present in the aryl group and the heteroaryl group mentioned above include nitro, halogen atom, alkyl group having 1 to 3 carbon atoms, haloalkyl group having 1 to 3 carbon atoms, acetyl group, haloacetyl group, and alkoxy group having 1 to 3 carbon atoms.

[0263] L 1 It represents -SO- or -SO2-.

[0264] As L 1 , preferably -SO2-.

[0265] X 1 ~X 3 Each can be represented independently as either a hydrogen atom or a halogen atom. Where X... 1 ~X 3 Except for the case where all atoms are hydrogen atoms.

[0266] As X 1 ~X 3 Examples of suitable atoms include fluorine, chlorine, bromine, and iodine, with chlorine, bromine, or iodine atoms being preferred, and chlorine or bromine atoms being more preferred.

[0267] Examples of compounds represented by formula (1) include hexabromodimethyl sulfoxide, pentabromodimethyl sulfoxide, hexabromodimethyl sulfone, trichloromethylphenyl sulfone, tribromomethylphenyl sulfone (BMPS), trichloro-p-chlorophenyl sulfone, tribromomethyl-p-nitrophenyl sulfone, 2-trichloromethylbenzothiazole sulfone, 4,6-dimethylpyrimidine-2-tribromomethyl sulfone, tetrabromodimethyl sulfone, 2,4-dichlorophenyl-trichloromethyl sulfone, 2-methyl-4-chlorophenyltrichloromethyl sulfone, 2,5-dimethyl-4-chlorophenyltrichloromethyl sulfone, 2,4-dichlorophenyltrimethyl sulfone and tri-p-tolylsulfonium trifluoromethanesulfonate, preferably trichloromethylphenyl sulfone or tribromomethylphenyl sulfone (BMPS), more preferably tribromomethylphenyl sulfone (BMPS).

[0268] R 4 CX 6 X 7 X 8 ……(2)

[0269] In equation (2), R4 This indicates a heteroaryl group that can have substituents. X 6 ~X 8 Each can be represented independently as either a hydrogen atom or a halogen atom. Where X... 6 ~X 8 Except for the case where all atoms are hydrogen atoms.

[0270] As R 4 The heteroaryl group represented is preferably a heteroaryl group with 4 to 20 carbon atoms, more preferably a heteroaryl group with 4 to 13 carbon atoms, and even more preferably a heteroaryl group with 4 to 9 carbon atoms, wherein a triazine group is preferred.

[0271] As R 4 The substituents that the heteroaryl group can have include, for example, nitro, halogen atom, alkyl group with 1 to 3 carbon atoms, haloalkyl group with 1 to 3 carbon atoms, acetyl group, haloacetyl group, and alkoxy group with 1 to 3 carbon atoms.

[0272] As X 6 ~X 8 The halogen atom represented can be, for example, a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom, preferably a chlorine atom, a bromine atom, or an iodine atom, more preferably a chlorine atom or a bromine atom.

[0273] Examples of compounds represented by formula (2) include 2,4,6-tris(trichloromethyl)-1,3,5-triazine and 2-methyl-4,6-bis(trichloromethyl)-1,3,5-triazine.

[0274] Examples of oxime compounds include (2-methyl-2-[(4-methylphenyl)sulfonyl]-1-[4-(methylthio)phenyl]-1-propanone).

[0275] Examples of diazo compounds include bis(tert-butylsulfonyl)diazomethane, bis(cyclohexylsulfonyl)diazomethane, and bis(4-methylphenylsulfonyl)diazomethane.

[0276] (Ionic acid-producing agent)

[0277] Examples of ionic acid-generating agents include diazonium salts, iodine salts, and sulfonium salts, with sulfonium salts or iodine salts being preferred, sulfonium salts being more preferred, and triarylsulfonium salts being even more preferred.

[0278] As for the aryl group present in the above-mentioned triarylsulfonium salt compound, examples of aryl groups that may have substituents can be cited. From the viewpoint of having better effects of the present invention, it is preferable to have an aryl group that does not have substituents (unsubstituted aryl group).

[0279] As ionic acid-generating agents, examples include compounds described in Japanese Patent Application Publication Nos. 62-161860, 61-067034, and 62-050382, and these contents are incorporated into this specification.

[0280] Examples of ionic acid-generating agents include triarylsulfonium salts such as triarylsulfonium hexafluorophosphate (e.g., triphenylsulfonium hexafluorophosphate, trimethylsulfonium hexafluorophosphate, and diphenylmethylsulfonium hexafluorophosphate), triarylsulfonium arsenates (e.g., triphenylsulfonium acetate), and triarylsulfonium antimonates (e.g., triphenylsulfonium antimonates).

[0281] Furthermore, examples of sulfonium salt compounds other than triarylsulfonium salt compounds include dialkylbenzoylmethylsulfonium tetrafluoroborate, dialkylbenzoylmethylsulfonium hexafluorophosphate, dialkyl-4-hydroxyphenylsulfonium tetrafluoroborate, and dialkyl-4-hydroxyphenylsulfonium hexafluorophosphate.

[0282] Furthermore, examples of iodized salt compounds include diaryliodohexafluorophosphate, diaryliodoarsenate, and diaryliodoantimonate.

[0283] A specific acid-producing agent can be used alone or in combination with two or more agents.

[0284] The content of a specific acid-generating agent is preferably 0.03–3 g / m² relative to the unit area of ​​the ultraviolet sensing layer. 2 More preferably 0.05~1.5g / m 2 Further optimization is achieved with a concentration of 0.1–1 g / m³. 2 .

[0285] Methanol can be extracted and the content of the specific acid-producing agent can be determined by liquid chromatography in the same manner as the method for determining the content of the specific chromogenic agent described above. Furthermore, the specific acid-producing agent is detected at its maximum absorption wavelength.

[0286] <mass ratio>

[0287] The mass ratio of the content of a specific acid-producing agent to the content of a specific color-developing agent (content of specific acid-producing agent / content of specific color-developing agent) is 1.01 to 40.00, preferably 2.01 to 40.00, and more preferably 3.00 to 35.00, from the viewpoint of better effect of the present invention.

[0288] Furthermore, as a preferred method for ultraviolet inspection tools, a specific color-generating agent may be provided in a manner in which the specific color-generating agent comprises at least one selected from the group consisting of a compound represented by formula (I), a compound represented by formula (III), and their open-ring compounds, and the mass ratio of the content of the specific acid-generating agent to the content of the specific color-generating agent is 2.01 to 40.00.

[0289] It is speculated that when the above mass ratio is within the above range, the absorption of light with a wavelength of 222nm by a specific colorant is suppressed, and the specific acid-producing agent can effectively absorb light with a wavelength of 222nm, so the effect of the present invention is even better.

[0290] Methanol can be extracted in the same manner as the method for determining the content of the specific chromophore described above, and the mass ratio of the content of the specific acid-producing agent to the content of the specific chromophore can be determined by liquid chromatography. Furthermore, the specific acid-producing agent and the specific chromophore are detected at their respective maximum absorption wavelengths, and their mass ratio is calculated.

[0291] <Light stabilizers>

[0292] The ultraviolet sensing layer may contain a light stabilizer.

[0293] Light stabilizers are simply light-stabilized materials, preferably free radical scavenging substances that capture the free radicals of specific acid-producing agents that have been activated.

[0294] Examples of light stabilizers include polyvalent phenols such as 2,5-bis(1,1,3,3-tetramethylbutyl)hydroquinone, hydroquinone, catechol, resorcinol, and hydroxyhydroquinone, as well as aminophenols such as o-aminophenol and p-aminophenol.

[0295] Light stabilizers can be used alone or in combination with two or more.

[0296] The molar ratio of the light stabilizer content to the content of the specific acid-producing agent (molar ratio of light stabilizer content / content of specific acid-producing agent) is preferably 0.0001 to 10, more preferably 0.0002 to 5.

[0297] <UV absorber>

[0298] The ultraviolet sensing layer may contain an ultraviolet absorber.

[0299] Ultraviolet absorbers can be used alone or in combination with two or more.

[0300] Examples of ultraviolet absorbers include benzotriazole compounds, benzophenone compounds, triazine compounds, and benzodithiol compounds having a benzotriazole structure.

[0301] From the viewpoint of superior sensitivity to light with a wavelength of 222 nm, ultraviolet absorbers are preferably those with low absorption of light with a wavelength of 222 nm. Triazine compounds, benzophenone compounds, or benzodithiols are preferred as ultraviolet absorbers.

[0302] Furthermore, the ultraviolet sensing layer preferably does not contain benzotriazole compounds that have high absorption of light at a wavelength of 222 nm. If the ultraviolet sensing layer contains benzotriazole compounds, the content of the benzotriazole compound relative to the total mass of the specific acid-producing agent is preferably 1% by mass or less, more preferably 0.5% by mass or less. The lower limit is mostly 0.0001% by mass or more. Furthermore, the content of the benzotriazole compound relative to the total mass of the specific color-developing agent is preferably 1% by mass or less, more preferably 0.5% by mass or less. The lower limit is mostly 0.0001% by mass or more.

[0303] Examples of triazine compounds include ADEKA STAB LA-F70 (manufactured by ADEKA CORPORATION), Tinuvin 1577ED, Tinuvin 1600 (manufactured by BASF), 2,4-bis(2,4-dimethylyl)-6-(2-hydroxy-4-n-octyloxophenyl)-1,3,5-triazine, 2-(2,4-dihydroxyphenyl)-4,6-diphenyl-1,3,5-triazine, and ethylhexyltriazinone (manufactured by Tokyo Chemical Industry Co., Ltd.).

[0304] Examples of benzophenone compounds include Chimassorb 81 and Chimassorb 81 FL (manufactured by BASF).

[0305] Examples of benzodithiols include those described in International Publication No. 2019 / 159570.

[0306] <Adhesive>

[0307] The ultraviolet sensing layer may contain an adhesive.

[0308] The adhesive described above preferably includes either a water-soluble adhesive resin or a non-water-soluble adhesive resin.

[0309] Examples of adhesives include cellulose resins such as methylcellulose, ethylcellulose, carboxymethylcellulose, and carboxypropylcellulose; polyvinyl alcohol; polyvinyl butyral; gum arabic; gelatin; polyvinylpyrrolidone; casein; styrene-butadiene copolymer; acrylonitrile-butadiene copolymer; polyvinyl acetate; acrylic resin; polyvinyl chloride; and ethylene-vinyl acetate copolymer. From the viewpoint of superior performance of the present invention, adhesives that are substantially free of aromatic groups are preferred, and cellulose resins or acrylic resins are more preferred.

[0310] From the viewpoint of achieving better results with the present invention, the adhesive is preferably a resin containing hydroxyl groups. Examples of resins containing hydroxyl groups include the aforementioned cellulose resin, polyvinyl alcohol, and polyvinyl butyral.

[0311] From the viewpoint of not developing color under no irradiation and exhibiting excellent storage stability, the adhesive preferably has a low acid value. Specifically, 0 to 50 mg KOH / g is preferred, and 0 to 20 mg KOH / g is more preferred. Furthermore, as an adhesive, examples include the adhesive described in paragraph 0078 of Japanese Patent Application Publication No. 2017-167155, and these contents are incorporated into this specification.

[0312] One type of adhesive can be used alone, or two or more types can be mixed together.

[0313] Adhesives can be cross-linked. In other words, adhesives can be cross-linked adhesives.

[0314] There are no particular limitations on the crosslinking agent; for example, ethylenedioxazole can be used. Furthermore, the crosslinking agent described in paragraph 0079 of Japanese Patent Application Publication No. 2017-167155 can also be referenced. This information is incorporated herein by reference.

[0315] To suppress excessive absorption of light at a wavelength of 222 nm, the adhesive preferably does not contain aromatic rings. "Substantially does not contain aromatic rings" means that the content of aromatic rings relative to the total mass of the adhesive is preferably 0-1% by mass, more preferably 0-0.1% by mass.

[0316] <surfactants>

[0317] The ultraviolet sensing layer may contain surfactants.

[0318] As surfactants, anionic or nonionic surfactants are preferred, such as alkylbenzene sulfonates (e.g., sodium dodecylbenzene sulfonate and ammonium dodecylbenzene sulfonate), alkyl sulfonates (e.g., sodium lauryl sulfate and sodium dioctyl sulfosuccinate), and polyalkylene glycols (e.g., nonylphenol polyoxyethylene ether).

[0319] <Other Ingredients>

[0320] In addition to the above-mentioned components, the ultraviolet sensing layer may, as needed, include at least one additive selected from the group consisting of colorants other than colorants, paraffin wax, colorants other than specific colorants, acid-producing agents other than specific acid-producing agents, and deodorants.

[0321] Colorants can be used in conjunction with color-developing agents to control color.

[0322] Examples of coloring agents include dyes and pigments. Examples of pigments include inorganic particles such as yellow and white pigments described in paragraphs 0018 to 0022 of International Publication No. 2016 / 017701.

[0323] <Method for forming an ultraviolet sensing layer>

[0324] Well-known methods can be cited as methods for forming the ultraviolet sensing layer.

[0325] For example, a method can be described by coating a composition for forming an ultraviolet sensing layer onto a support and, if necessary, drying the coating.

[0326] The composition for forming the ultraviolet sensing layer may contain a specific colorant, a specific acid colorant, and other components mentioned above as needed.

[0327] As a method for forming a composition for coating an ultraviolet sensing layer, the coating machine used during coating can be, for example, an air knife coating machine, a bar coating machine, a rod coating machine, a curtain coating machine, a gravure coating machine, an extrusion coating machine, a die coating machine, a sliding bead coating machine, and a doctor blade coating machine.

[0328] The composition for forming the ultraviolet sensing layer can be applied to a support, and then the coating can be dried as needed. Examples of drying processes include air blowing and heating.

[0329] Furthermore, while the method for forming an ultraviolet sensing layer on a support has been described above, it is not limited to the above method. For example, after forming an ultraviolet sensing layer on a temporary support, the temporary support can be peeled off to form an ultraviolet inspection tool composed of an ultraviolet sensing layer.

[0330] As a temporary support, there are no particular restrictions as long as it is a peelable support.

[0331] [Support body]

[0332] Ultraviolet inspection tools may have a support.

[0333] The support is a component used to support the ultraviolet sensing layer.

[0334] In addition, if the ultraviolet sensing layer itself can perform the processing, the ultraviolet inspection tool may not need a support.

[0335] Examples of materials that can be used as a support include resin sheets, paper (including synthetic paper), cloth (including woven and nonwoven fabrics), glass, wood, and metal. Resin sheets or paper are preferred as the support, more preferably resin sheets or synthetic paper, and even more preferably resin sheets.

[0336] Examples of resin sheet materials include polyethylene resin, polypropylene resin, cyclic polyolefin resin, polystyrene resin, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, polyvinyl chloride resin, fluororesin, poly(meth)acrylic acid resin, polycarbonate resin, polyester resin (e.g., polyethylene terephthalate and polyethylene naphthalate), nylon and other polyamide resins, polyimide resin, polyamide-imide resin, polyaryl phthalate resin, silicone resin, polysulfone resin, polyphenylene sulfide resin, polyethersulfone resin, polyurethane resin, acetal resin, and cellulose resin.

[0337] Examples of synthetic paper include synthetic paper made by biaxially stretching polypropylene or polyethylene terephthalate to form multiple micropores (e.g., YUPO), synthetic paper made using synthetic fibers such as polyethylene, polypropylene, polyethylene terephthalate and polyamide, and synthetic paper made by layering these on a portion of paper, either on one side or both sides.

[0338] Furthermore, as another preferred method for resin sheets, white resin sheets made by dispersing white pigment in resin can also be cited. The same material as the resin used in the aforementioned white resin sheets can be used.

[0339] White resin sheets are reflective of ultraviolet light. Therefore, when the support is a white resin sheet, the scattering of ultraviolet light inside the ultraviolet inspection tool is suppressed because the ultraviolet light irradiated onto the tool is reflected by the support. As a result, the detection accuracy of ultraviolet irradiation in the ultraviolet inspection tool can be further improved.

[0340] As a white pigment, the white pigment described in paragraph 0080 of International Publication No. 2016 / 017701 can be cited, and these contents are incorporated into this specification.

[0341] As a white resin sheet, a white polyester sheet is preferred, and a white polyethylene terephthalate sheet is more preferred.

[0342] Commercially available white resin sheets include, for example, YUPO (manufactured by Yupo Corporation), Lumirror (manufactured by Toray Industries, Inc.) and CRISPR (manufactured by TOYOBO CO., LTD.).

[0343] The thickness of the support is preferably 5 μm or more, more preferably 25 μm or more, and even more preferably 50 μm or more. The upper limit is preferably 1 cm or less, more preferably 2 mm or less, and even more preferably 500 μm or less.

[0344] [Other layers]

[0345] The ultraviolet inspection tool may have other layers besides the ultraviolet sensing layer and the support body mentioned above.

[0346] Other layers that can be included include reflective layers, gloss layers, filter layers, and sensitivity adjustment layers.

[0347] <Reflective layer>

[0348] Ultraviolet inspection tools can be further equipped with a reflective layer.

[0349] When the ultraviolet sensing layer has a reflective layer, the ultraviolet rays irradiated onto the ultraviolet inspection tool can be reflected by the ultraviolet-reflective layer, thus suppressing the scattering of ultraviolet rays inside the ultraviolet inspection tool and further improving the detection accuracy of ultraviolet irradiation.

[0350] The reflectivity of the reflective layer to light with wavelengths of 180–380 nm is preferably 10–100%, more preferably 50–100%. The reflectivity can be measured, for example, by diffuse reflectance measurement using a UV-Vis spectrophotometer (UV-2700, manufactured by Shimadzu Corporation).

[0351] In addition, when the support and the reflective layer are arranged adjacent to each other, an adhesive layer can be provided between the support and the reflective layer.

[0352] As for reflective layers and adhesive layers and methods of manufacturing thereof, examples can be found in paragraphs 0082 to 0091 of International Publication No. 2016 / 017701, and these contents are incorporated into this specification.

[0353] <Gloss Layer>

[0354] Ultraviolet inspection tools can be further enhanced with a glossy layer.

[0355] When the ultraviolet sensing layer has a glossy layer, the visibility of both the front and back sides can be improved.

[0356] As for the glossy layer and the method of manufacturing the same, examples can be found in paragraphs 0092 to 0094 of International Publication No. 2016 / 017701, and these contents are incorporated into this specification.

[0357] <Filter Layer>

[0358] Ultraviolet inspection tools preferably have a filter layer.

[0359] The filter layer is a layer that selectively transmits light of certain arbitrary wavelengths (hereinafter also referred to as "specified wavelengths"). "Selective transmission of specified wavelengths" means allowing light of the specified wavelengths to pass through while blocking other light. The specified wavelengths can be appropriately adjusted according to the intended use of the ultraviolet inspection tool. The transmittance of the transmitted wavelengths is preferably 70-100%, more preferably 80-100%, and even more preferably 90-100%. The transmittance of the blocked wavelengths is preferably 0-30%, more preferably 0-20%, and even more preferably 0-10%.

[0360] The filter layer is preferably a filter layer that blocks light with a wavelength of 300 nm or higher, and more preferably a filter layer that blocks light with a wavelength of 300 to 800 nm. A filter that preferably includes an ultraviolet bandpass filter and / or a dielectric is preferred.

[0361] In addition, the spectral characteristics of the filter layer and the sensitivity adjustment layer described later can be measured, for example, using a UV-Vis spectrophotometer (UV-2700, manufactured by Shimadzu Corporation).

[0362] The filter layer preferably contains an ultraviolet absorber. Known ultraviolet absorbers can be used as the ultraviolet absorber.

[0363] As for the filter layer and the method of manufacturing the same, for example, the filter layer and the method of manufacturing the same described in paragraphs 0016 to 0026 of International Publication No. 2016 / 017701 can be cited, and these contents are incorporated into this specification.

[0364] <Sensitivity Adjustment Layer>

[0365] When an ultraviolet inspection tool has a filter layer, a sensitivity adjustment layer can be further added to the surface of the filter layer.

[0366] As for the sensitivity adjustment layer and the method of manufacturing thereof, for example, the sensitivity adjustment layer and the method of manufacturing thereof described in paragraphs 0095 to 0109 of International Publication No. 2016 / 017701 can be cited, and these contents are incorporated into this specification.

[0367] Implementation Method 2

[0368] The second embodiment of the ultraviolet inspection tool is an embodiment that includes the microcapsules described later.

[0369] Specifically, in the second embodiment of the ultraviolet inspection tool, the ultraviolet sensing layer comprises microcapsules.

[0370] The microcapsules contain specific color-developing agents and specific acid-producing agents.

[0371] The mass ratio of the content of a specific acid-producing agent to the content of a specific color-developing agent is 1.01 to 40.00.

[0372] In addition, as a second embodiment of the ultraviolet inspection tool 10, the ultraviolet sensing layer 14 includes microcapsules (not shown), which contain a specific colorant and a specific acid-producing agent. Otherwise, it is the same as the first embodiment of the ultraviolet inspection tool 10.

[0373] The components of the second embodiment of the ultraviolet inspection tool will be described in detail below.

[0374] [Ultraviolet Sensing Layer]

[0375] The ultraviolet inspection tool has an ultraviolet sensing layer.

[0376] The ultraviolet sensing layer contains microcapsules containing specific colorants and specific acid-producing agents.

[0377] Microcapsules

[0378] The ultraviolet sensing layer contains microcapsules.

[0379] The materials that make up the microcapsules are described in detail below.

[0380] Microcapsules typically have a core and a capsule wall for containing the core material (the contents, hereinafter also referred to as "inclusions") that constitute the core.

[0381] The microcapsules contain specific acid-producing agents and specific color-developing agents as core materials (components).

[0382] As microcapsules, it is preferable to prevent contact between substances inside and outside the capsule through the material barrier effect of the capsule wall at room temperature. Specifically, Japanese Patent Application Publication Nos. 59-190886 and 60-242094 can be cited, and these contents are incorporated into this specification.

[0383] (Capsule wall)

[0384] The capsule wall of the microcapsule is preferably made of resin.

[0385] "Substantially composed of resin" means that the resin content is 90% by mass or more, preferably 100% by mass, relative to the total mass of the capsule wall. That is, the capsule wall of the microcapsule is preferably composed of resin.

[0386] Examples of the aforementioned resins include polyurethane, polyurea, polyurethane urea, polyester, polycarbonate, urea-formaldehyde resin, melamine-formaldehyde resin, polystyrene, styrene-methacrylate copolymer, gelatin, polyvinylpyrrolidone, and polyvinyl alcohol. From the viewpoint of having a dense cross-linked structure that prevents leakage of inclusions and controlling the transmittance at a wavelength of 222 nm, thereby further improving the colorimetric properties for light at a wavelength of 222 nm, at least one of the following groups is more preferred: polyurea, polyurethane urea, and polyurethane.

[0387] Polyurea is preferably a polymer having multiple urea bonds and is a reaction product formed from raw materials containing polyamines and polyisocyanates.

[0388] In addition, by reacting a portion of the polyisocyanate with water to form a polyamine, it is possible to synthesize polyurea using polyisocyanate without using polyamine.

[0389] Furthermore, the polyurethane urea is preferably a polymer having urethane bonds and urea bonds, and is a reaction product formed from raw materials containing polyols, polyamines and polyisocyanates.

[0390] In addition, when polyols are reacted with polyisocyanates, a portion of the polyisocyanate reacts with water to become polyamines, sometimes resulting in polyurethane urea.

[0391] Furthermore, the polyurethane is preferably a polymer having multiple urethane bonds and is a reaction product formed from raw materials comprising polyols and polyisocyanates.

[0392] Polyisocyanates preferably have aromatic or alicyclic rings.

[0393] Among these, polyisocyanates with alicyclic rings are preferred. When using polyisocyanates with alicyclic rings, the transparency of the microcapsule walls is excellent, resulting in superior sensitivity to light at a wavelength of 222 nm.

[0394] Examples of aromatic polyisocyanates include, for instance, aromatic diisocyanates, specifically, m-phenylene diisocyanate, p-phenylene diisocyanate, 2,6-toluene diisocyanate, 2,4-toluene diisocyanate, naphthalene-1,4-diisocyanate, diphenylmethane-4,4'-diisocyanate, 3,3'-dimethoxy-biphenyl diisocyanate, 3,3'-dimethyldiphenylmethane-4,4'-diisocyanate, xylene-1,4-diisocyanate, xylene-1,3-diisocyanate, 4-chloroxylene-1,3-diisocyanate, 2-methylxylene-1,3-diisocyanate, 4,4'-diphenylpropane diisocyanate, and 4,4'-diphenylhexafluoropropane diisocyanate.

[0395] Examples of aliphatic polyisocyanates include, for instance, aliphatic diisocyanates, specifically, trimethylene diisocyanate, hexamethylene diisocyanate, propylene-1,2-diisocyanate, butylene-1,2-diisocyanate, cyclohexene-1,2-diisocyanate, cyclohexene-1,3-diisocyanate, cyclohexene-1,4-diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, 1,4-bis(isocyanate methyl)cyclohexane, 1,3-bis(isocyanate methyl)cyclohexane, isophorone diisocyanate, lysine diisocyanate, hydrogenated toluene diisocyanate, and hydrogenated diphenylene diisocyanate.

[0396] Examples of polyisocyanates include polyisocyanates with three or more functions (e.g., trifunctional triisocyanates and tetrafunctional tetraisocyanates).

[0397] As a polyisocyanate with three or more functions, it is preferred to be an adduct (addition product) of an aromatic or alicyclic diisocyanate and a compound having three or more active hydrogen groups in one molecule (e.g., polyols, polyamines, or polythiols with three or more functions), i.e., a polyisocyanate with three or more functions (addition-type polyisocyanates with three or more functions) and a trimer of an aromatic or alicyclic diisocyanate (biuret type or isocyanurate type).

[0398] Examples of polyisocyanates include formalin condensates of benzene isocyanate, methacryloyloxyethyl isocyanate, and lysine triisocyanate, which have polymerizable groups.

[0399] For polyisocyanates, one can refer to the "Polyurethane Resin Handbook" (edited by Keiji Iwata, published by Nikkan Kogyo Shimbun (1987)).

[0400] Examples of polyols include aliphatic and aromatic polyols, hydroxyl polyesters, and hydroxyl polyalkylene ethers.

[0401] Specifically, examples include the polyols described in Japanese Patent Application Publication No. 60-049991, such as dihydroxycyclohexane, diethylene glycol, 1,2,6-trihydroxyhexane, 2-phenylpropanediol, 1,1,1-trimethylolpropane, hexanetriol, and pentaerythritol.

[0402] The content of hydroxyl groups in the polyol is preferably 0.02 to 2 moles relative to 1 mole of isocyanate group.

[0403] Examples of polyamines include ethylenediamine, trimethylenediamine, tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, tetraethylenepentamine, and amine adducts of epoxides.

[0404] Polyisocyanates can also react with water to form polymers.

[0405] Examples of polyisocyanates, polyols, and polyamines include, for example, U.S. Patent Nos. 3,281,383, 3,773,695, 3,793,268, Japanese Patent Publication Nos. Sho 48-040347, 49-024159, 48-080191, and 48-084086, and these contents are incorporated herein by reference.

[0406] The average particle size of the microcapsules, measured by volume average particle size, is preferably 0.1 to 100 μm.

[0407] (solvent)

[0408] From the viewpoint that the microcapsules can dissolve specific colorants and specific acid-producing agents and that the present invention has better effects, the microcapsules preferably contain a solvent, and more preferably contain a solvent with a boiling point of 100°C or higher.

[0409] As a solvent, for example, well-known organic solvents can be cited, aromatic solvents are preferred, and aromatic phosphates are more preferred.

[0410] -Aromatic solvents-

[0411] Aromatic solvents are aromatic solvents containing aromatic rings.

[0412] Aromatic solvents can contain heteroatoms.

[0413] As for heteroatoms in aromatic solvents containing heteroatoms, examples include atoms other than carbon and hydrogen atoms, with nitrogen, oxygen, sulfur, or phosphorus atoms being preferred, and oxygen or phosphorus atoms being more preferred. From the viewpoint of ensuring transmittance of light at a wavelength of 222 nm, promoting the colorimetric reaction, and having superior sensitivity to light at a wavelength of 222 nm, aromatic solvents containing heteroatoms preferably include at least one selected from the group consisting of carboxylic acid ester linkages, sulfonate linkages, phosphate ester linkages, carbonyl linkages, and sulfonate linkages.

[0414] Examples of aromatic solvents containing heteroatoms include substituted or unsubstituted benzenesulfonates such as methyl benzenesulfonate, ethyl benzenesulfonate, methyl toluenesulfonate, and ethyl toluenesulfonate; substituted or unsubstituted phthalate diesters such as dimethyl phthalate, diethyl phthalate, dibutyl phthalate, dipentyl phthalate, dihexyl phthalate, and dicyclohexyl phthalate; triphenyl phosphate (TPP), tricresyl phosphate (TCP), and tris(2-xyl)-cresyl phosphate (TPP). Aromatic phosphates include TXP, toluene diphenyl phosphate (CDP), 2-ethylhexyl diphenyl phosphate (EHDP), tert-butylphenyl diphenyl phosphate (t-BDP), bis-(tert-butylphenyl)phenyl phosphate (BBDP), tri-(tert-butylphenyl) phosphate (TBDP), isopropylphenyl diphenyl phosphate (IPP), bis-(isopropylphenyl) diphenyl phosphate (BIPP), and tri-(isopropylphenyl) phosphate (TIPP).

[0415] Examples of aromatic solvents that do not have heteroatoms include alkylbenzenes, diarylalkanes such as 1,1-diphenylethane and 1-phenyl-1-(2,3-dimethyl)ethane, alkylbiphenyls such as isopropylbiphenyl, triarylmethane, diarylalkylene and aryldihydroindene, and other aromatic hydrocarbons.

[0416] The boiling point of the solvent is preferably 100–500°C, more preferably 120–500°C, and even more preferably 140–500°C.

[0417] One solvent can be used alone, or two or more solvents can be used in combination.

[0418] (Specific colorant)

[0419] The microcapsules contain specific color-developing agents.

[0420] As a specific colorant contained within the microcapsule, examples can be made of the same type of colorant as the specific colorant contained in the ultraviolet sensing layer in the first embodiment described above, and the preferred method is also the same.

[0421] (Specific acid-producing agents)

[0422] The microcapsules contain specific acid-producing agents.

[0423] As a specific acid-producing agent contained within the microcapsule, examples can be made of the same type of acid-producing agent as the specific acid-producing agent contained in the ultraviolet sensing layer in the first embodiment described above, and the preferred method is also the same.

[0424] (mass ratio)

[0425] The mass ratio of the content of a specific acid-producing agent to the content of a specific color-developing agent (content of specific acid-producing agent / content of specific color-developing agent) is 1.01 to 40.00, preferably 2.01 to 40.00, and more preferably 3.00 to 35.00, from the viewpoint of better effect of the present invention.

[0426] Referring to the method for determining the content of the specific chromophore described above, methanol is extracted, and the mass ratio of the content of the specific acid-producing agent to the content of the specific chromophore is determined by liquid chromatography. Furthermore, the specific acid-producing agent and the specific chromophore are detected at their respective maximum absorption wavelengths, and their mass ratio is calculated.

[0427] <Methods for manufacturing microcapsules>

[0428] Methods for manufacturing microcapsules include well-known methods such as interfacial polymerization, internal polymerization, phase separation, external polymerization, and agglomeration.

[0429] As an example of a method for manufacturing microcapsules, one can include an emulsification process and an encapsulation process as described below. Furthermore, in the encapsulation process, it is preferable to form the resin wall (capsule wall) using interfacial polymerization.

[0430] Emulsification process: The process of preparing an emulsion by mixing a specific colorant, a specific acid-generating agent, a solvent, and an emulsifier in water.

[0431] Encapsulation process: The process of encapsulating oil droplets containing specific colorants, specific acid-producing agents, and solvents obtained from the emulsion process to form a resin wall (capsule wall).

[0432] The following describes the interfacial polymerization method using a method for manufacturing microcapsules with polyurea or polyurethane urea as an example.

[0433] As an interfacial polymerization method, an interfacial polymerization method comprising the following steps is preferred: a step of preparing an emulsion by dispersing an oil phase containing a specific acid-generating agent, a solvent, a solvent with a boiling point of less than 100°C (hereinafter also referred to as "encapsulation solvent"), a specific colorant, and a capsule wall material (e.g., polyisocyanate) in an aqueous phase containing an emulsifier (emulsification step); and a step of forming a capsule wall by polymerizing the capsule wall material at the interface between the oil phase and the aqueous phase to form a capsule wall, thereby forming microcapsules containing a specific acid-generating agent, a solvent, and a specific colorant (encapsulation step).

[0434] In the emulsification process described above, the encapsulation solvent is a component that can typically be added to improve the solubility of the core material in the solvent. The encapsulation solvent is removed through a drying process in the method for forming the ultraviolet sensing layer, described later. Therefore, the microcapsules in the ultraviolet inspection tool preferably do not contain the encapsulation solvent.

[0435] Examples of solvents used in capsule manufacturing include ethyl acetate (boiling point 77°C), isopropyl acetate (boiling point 89°C), methyl ethyl ketone (boiling point 80°C), and dichloromethane (boiling point 40°C).

[0436] The solvent used for capsule making can be a single solvent or a mixture of two or more solvents.

[0437] Furthermore, examples of emulsifiers used in the emulsification process include dispersants and surfactants.

[0438] As a dispersant, examples include water-soluble polymers selected from the group consisting of known anionic polymers, nonionic polymers, and amphoteric polymers. Specifically, examples include polyvinyl alcohol, gelatin, and cellulose derivatives, with polyvinyl alcohol being preferred.

[0439] As a surfactant, the surfactant in the first embodiment of the ultraviolet inspection tool can be cited as an example.

[0440] Furthermore, as other methods for manufacturing microcapsules, the methods described in U.S. Patent No. 3,726,804 and U.S. Patent No. 3,796,696 are also cited and incorporated into this specification.

[0441] The content of microcapsules in the ultraviolet sensing layer is preferably 50-99% by mass, more preferably 60-90% by mass, relative to the total mass of the ultraviolet sensing layer.

[0442] The content of microcapsules (solid component coating amount) in the ultraviolet sensing layer is preferably 0.1 to 30 g / m² relative to the unit area of ​​the ultraviolet sensing layer. 2 As a lower limit, 0.5 g / m³ is preferred. 2 More preferably, 1g / m2 The above is the upper limit, preferably 25g / m³. 2 Below, 20g / m is preferred. 2 the following.

[0443] The ultraviolet sensing layer may contain other components besides the microcapsules mentioned above.

[0444] Other components include, for example, binders, reducing agents, light stabilizers, crosslinking agents, sensitizers, colorants, UV absorbers, and surfactants.

[0445] As an adhesive, for example, the adhesive in the first embodiment of the ultraviolet inspection tool can be cited.

[0446] As reducing agents, sensitizing agents, and surfactants, reference can be made to the descriptions on page 9 (bottom left column) to page 10 (top left column) of Japanese Patent Application Publication No. 1-207741, and paragraphs 0038-0039 and 0048-0059 of Japanese Patent Application Publication No. 2004-233614, and these contents are incorporated into this specification.

[0447] Furthermore, as reducing agents, light stabilizers, ultraviolet absorbers, and surfactants, they can also be used in microcapsules.

[0448] The mass per unit area of ​​the ultraviolet sensing layer (solid component coating amount) is preferably, for example, 0.1 to 30 g / m². 2 More preferably 0.5–25 g / m 2 Further optimization of 1-10 g / m 2 .

[0449] The thickness of the ultraviolet sensing layer is preferably 0.1 to 30 μm, more preferably 0.5 to 25 μm, and even more preferably 1 to 10 μm.

[0450] <Method for forming an ultraviolet sensing layer>

[0451] As a method for forming the aforementioned ultraviolet sensing layer, well-known methods can be cited.

[0452] For example, a method can be described by coating a composition for forming an ultraviolet sensing layer containing the above-mentioned microcapsules onto a support, and then drying the coating as needed.

[0453] As a specific step in the above-described method using a composition for forming an ultraviolet sensing layer containing microcapsules, the steps of the method for forming an ultraviolet sensing layer in the first embodiment of the ultraviolet inspection tool can be cited.

[0454] [Ultraviolet Detection Kit]

[0455] The present invention also relates to an ultraviolet inspection kit comprising the above-described ultraviolet inspection tool.

[0456] The ultraviolet inspection kit contains at least the ultraviolet inspection tools described above.

[0457] A specific structure of an ultraviolet (UV) testing kit may include, for example, a UV testing tool; and other components selected from a filter layer having a selective transmission of light of a specific wavelength (preferably a filter that blocks light with a wavelength of 300 nm or higher), a light-blocking bag (UV cut-off bag), a judgment sample, a limit sample (calibration sheet), a focusing fixture such as a lens and a concave mirror, and a holding component for holding the UV testing tool.

[0458] In addition, the aforementioned holding component may have an opening for irradiating ultraviolet light onto the held ultraviolet inspection tool, or the holding component may be integrated with the judgment sample.

[0459] [Ultraviolet Light Inspection Method]

[0460] The present invention also relates to an ultraviolet inspection method for inspecting ultraviolet light with wavelengths of 180 to 230 nm using the above-mentioned ultraviolet inspection tool.

[0461] Example

[0462] The following examples and comparative examples further illustrate the features of the present invention. The materials, amounts, proportions, processing contents, and processing steps shown in the following examples can be appropriately modified without departing from the spirit of the invention. However, the scope of the invention should not be limited by the specific examples shown below. Unless otherwise stated, "%" and "parts" are based on mass.

[0463] [Making of Ultraviolet Inspection Tools]

[0464] [Example 1]

[0465] The mixture 1 with the following composition was added to a 5% by mass aqueous solution of polyvinyl alcohol (202 parts), and then emulsified and dispersed at 20°C to obtain an emulsion with a volume average particle size of 1 μm. Furthermore, the obtained emulsion was continuously stirred at 50°C for 4 hours. Water was then added to adjust the concentration, resulting in a microcapsule dispersion containing a colorant with a solid content of 21.2% by mass.

[0466] <Composition of Mixture 1>

[0467] Colorant: Colorant A, 3,3-bis(2-methyl-1-octyl-3-indolyl)phthalide (manufactured by BASF) (2.6 parts)

[0468] Acid-generating agents: BMPS, tribromomethylphenyl sulfone (manufactured by Sumitomo Seika Chemicals Company, Limited) (10 parts)

[0469] The microcapsules contain the following solvents: TCP and tricresyl phosphate (manufactured by DAIHACHI CHEMICAL INDUSTRY CO., LTD.) (23 parts).

[0470] Solvent for microencapsulation: Ethyl acetate (manufactured by Showa Denko KK) (50 parts)

[0471] Light stabilizer: 2,5-bis(1,1,3,3-tetramethylbutyl)hydroquinone (manufactured by Tokyo Chemical Industry Co., Ltd.) (0.03 parts)

[0472] Microcapsule wall forming material: D-110N (“TAKENATE D-110N”, manufactured by Mitsui Chemicals, Inc., 75% by mass ethyl acetate solution) (31 parts)

[0473] A composition for forming an ultraviolet sensing layer was prepared by mixing the obtained microcapsule dispersion (20 parts), a 6% aqueous solution of polyvinyl alcohol (product name "DENKASIZE EP-130", manufactured by Denka Co. Ltd.) (5 parts), glyoxal (manufactured by DAITO CHEMICAL CO.LTD.) (0.05 parts), and a 50% aqueous solution of sodium dodecylbenzenesulfonate (manufactured by DKS Co. Ltd.) (0.09 parts).

[0474] The obtained composition for forming the ultraviolet sensing layer was applied to a support of a 188 μm thick white polyethylene terephthalate sheet (“CRISPR K1212”, manufactured by TOYOBO CO., LTD.) to achieve a liquid coating amount of 21 mL / m. 2 The material was heated and dried at 105°C for 1 minute to produce an ultraviolet inspection tool with a support and an ultraviolet sensing layer. Furthermore, the solid content of the ultraviolet sensing layer was 3 g / m² relative to the area of ​​the ultraviolet sensing layer. 2 The thickness of the ultraviolet sensing layer is 3 μm.

[0475] [Examples 2-12 and Comparative Example 2]

[0476] Except for the changes to the types of ingredients, amounts of ingredients, concentrations of solid components, and content of colorant per unit area of ​​the ultraviolet sensing layer recorded in Table 1, the ultraviolet inspection tools of Examples 2-12 and Comparative Example 2 were produced using the same method as in Example 1.

[0477] [Example 13]

[0478] Trimethylol phosphate (23 parts) was replaced with 17 parts of tricresyl phosphate and 6 parts of phenyl dimethyl ethane (SAS-296: "Nippon Oil Hysol SAS296", manufactured by JX Nippon Oil & Energy Corporation), and the proportions were changed to those listed in Table 1. Otherwise, the ultraviolet inspection tool of Example 13 was prepared by the same method as in Example 1.

[0479] [Example 14]

[0480] Trimethylol phosphate (23 parts) was replaced with 23 parts of tricresyl phosphate and 7 parts of phenyl dimethyl ethane (SAS-296: "Nippon Oil Hysol SAS296", manufactured by JX Nippon Oil & Energy Corporation), and the proportions and solid content were changed to those listed in Table 1. Otherwise, the ultraviolet inspection tool of Example 14 was prepared by the same method as in Example 1.

[0481] [Comparative Example 1]

[0482] Referring to the radiation sensing composition No. 14 disclosed in Japanese Patent Application Publication No. 2001-242249, the mixture 1 was changed to the mixture C1. Otherwise, the ultraviolet inspection tool of Comparative Example 1 was prepared by the same method as in Example 1.

[0483] <Composition of Mixture C1>

[0484] Colorant: Colorant F, crystal violet lactone (manufactured by Tokyo Chemical Industry Co., Ltd.) (0.2 parts)

[0485] Acid-generating agents: BMPS, tribromomethylphenyl sulfone (manufactured by Sumitomo Seika Chemicals Company, Limited) (10 parts)

[0486] The microcapsules contain the solvent 1-octanol (manufactured by FUJIFILM Wako Pure Chemical Corporation) (14 parts).

[0487] The microcapsules contain the solvent xylene (manufactured by FUJIFILM Wako Pure Chemical Corporation) (7 parts).

[0488] Solvent for microencapsulation: Ethyl acetate (manufactured by Showa Denko KK) (50 parts)

[0489] Light stabilizer: 2,5-bis(1,1,3,3-tetramethylbutyl)hydroquinone (manufactured by Tokyo Chemical Industry Co., Ltd.) (0.03 parts)

[0490] Microcapsule wall forming material: D-110N (“TAKENATE D-110N”, manufactured by Mitsui Chemicals, Inc., 75% by mass ethyl acetate solution) (31 parts)

[0491] [Example 15]

[0492] 50 parts by weight of polyvinyl butyral (100% by weight solids), 300 parts by weight of tetrahydrofuran, and 68.2 parts by weight of ethanol were mixed to dissolve the polyvinyl butyral. 10.0 parts by weight of tribromomethylphenyl sulfone (manufactured by Sumitomo Seika Chemicals Company, Limited) and 5.0 parts by weight of 3,3-bis(2-methyl-1-octyl-3-indolyl)phthalide (manufactured by BASF) were added to the obtained polyvinyl butyral solution and dissolved. The obtained UV sensing layer forming composition was coated onto a 188 μm thick white polyethylene terephthalate sheet (product name "CRISPR K1212", manufactured by TOYOBO CO., LTD.) and dried to a film thickness of 5 μm to fabricate a UV inspection tool with a support and a UV sensing layer.

[0493] [Examples 16-20]

[0494] Except for the changes to the types of ingredients, amounts of ingredients, and content of colorant per unit area of ​​the ultraviolet sensing layer recorded in Table 1, the ultraviolet inspection tools of Examples 16-20 were produced using the same method as in Example 15.

[0495] [Example 21]

[0496] 25.8 parts by weight of acrylic resin 1 (acrylic acid / ethyl acrylate / methyl methacrylate = 13 / 40 / 47, acid value 100 mg KOH / g, 1-methoxy-2-propanol solution, solid content 38.8% by weight), 10.0 parts by weight of tribromomethylphenyl sulfone (manufactured by Sumitomo Seika Chemicals Company, Limited), 5.0 parts by weight of 3,3-bis(2-methyl-1-octyl-3-indolyl)phthalide (manufactured by BASF), and 10.2 parts by weight of methyl ethyl ketone were mixed and dissolved. The obtained composition for forming the ultraviolet sensing layer was coated onto a white polyethylene terephthalate sheet (product name "CRISPR K1212", manufactured by TOYOBO CO., LTD.) with a thickness of 188 μm and dried to a film thickness of 5 μm to produce an ultraviolet inspection tool with a support and an ultraviolet sensing layer.

[0497] [Comparative Example 3]

[0498] Referring to Example 5 of Japanese Patent Application Publication No. 62-112020, the ingredients and proportions listed in Table 2 were changed. Otherwise, the ultraviolet inspection tool of Comparative Example 3 was prepared by the same method as in Example 15.

[0499] The components shown in Tables 1 and 2 are as follows.

[0500] In addition, the values ​​in parentheses listed alongside the ingredient names in Tables 1 and 2 refer to the content (parts by mass).

[0501] [The microcapsules contain solvents]

[0502] • TCP (Trimethylbenzene Phosphate, manufactured by DAIHACHI CHEMICAL INDUSTRY CO., LTD., boiling point 231~255℃)

[0503] • SAS-296 (Phenylene dimethyl ethane, "Nippon OilHysol SAS296", manufactured by JX Nippon Oil & Energy Corporation, boiling point 290~305℃)

[0504] · 1-Octanol (manufactured by FUJIFILM Wako Pure Chemical Corporation)

[0505] Xylene (manufactured by FUJIFILM Wako Pure Chemical Corporation)

[0506] [Acid-producing agent]

[0507] •BMPS: Tribromomethylphenyl sulfone (molecular weight 393, manufactured by Sumitomo Seika Chemicals Company, Limited)

[0508] • PAG-A: Tris-tolylsulfonium hexafluorophosphate (molecular weight 450, manufactured by Tokyo Chemical Industry Co., Ltd.)

[0509] PAG-B: p-Octooxyphenyl-2,4,6-trimethoxyphenyl iodide hexafluorophosphate (molecular weight 644)

[0510] [Coloring agent]

[0511] • Colorant A: 3,3-bis(2-methyl-1-octyl-3-indolyl)phthalide (manufactured by BASF)

[0512] • Colorant B: Rhodamine B matrix (manufactured by KANTO CHEMICAL CO., INC.)

[0513] • Colorant C: 3',6'-bis(diethylamino)-2-(4-nitrophenyl)spiro[isoindol-1,9'-xanthon]-3-one (manufactured by Pink-DCF and Hodogaya Chemical Co., Ltd.)

[0514] • Colorant D: 6'-(ethylisobutylamino)-2'-anilino-3'-methylspiro[isobenzofuran-1(3H),9'-[9H]xanthan]-3-one

[0515] • Colorant E: 6'-(diethylamino)-1',3'-dimethylfluorane (manufactured by Orange-DCF and Hodogaya Chemical Co., Ltd.)

[0516] • Colorant F: 6-(dimethylamino)-3,3-bis[4-(dimethylamino)phenyl]phthalide (crystal violet lactone, manufactured by Tokyo Chemical Industry Co., Ltd.)

[0517] • Colorant G: 6'-(diethylamino)-1',2'-benzofluorane (manufactured by FUJIFILM Wako Pure Chemical Corporation)

[0518] [Microcapsule wall forming materials]

[0519] • D-110N (Adduct of xylene-1,3-diisocyanate with trimethylolpropane, product name "TAKENATE D-110N", manufactured by Mitsui Chemicals, Inc., 75% by mass ethyl acetate solution)

[0520] [Adhesive]

[0521] • PVB: Polyvinyl butyral (manufactured by Seki Sui Chemical Co., Ltd.)

[0522] • Acrylic Resin 1: Acrylic acid / ethyl acrylate / methyl methacrylate = 13 / 40 / 47, molecular weight 10,000

[0523] [evaluate]

[0524] [Evaluation of the colorimetric properties of light with a wavelength of 222 nm]

[0525] The ultraviolet sensing layer of the ultraviolet inspection tools of each embodiment and each comparative example was irradiated with light of a wavelength of 222 nm using Care222 (registered trademark) until the irradiation dose reached 3 mJ / cm². 2 .

[0526] Subsequently, using a spectrophotometer Spectrol ino (manufactured by Gretag Macbeth), the CIE L of the ultraviolet inspection tool before and after light irradiation was measured. * a * b * and in L * a * b * The distance before and after light irradiation was calculated on a coordinate system and denoted as ΔE. Regarding the measurement conditions, illumination type D65, observation field of view 2°, and concentration standard ANSI STATUS A were used. Furthermore, in each example and comparative example, open-ring compounds originating from specific chromophores were identified in each of the evaluated ultraviolet testing tools.

[0527] [Evaluation of color tone]

[0528] The ultraviolet sensing layer was irradiated with ultraviolet light under the same conditions as described above (evaluation of the colorimetric properties of light with a wavelength of 222 nm).

[0529] Subsequently, using a Spectrolino spectrophotometer (manufactured by Gretag Macbeth), the CIE L of the ultraviolet inspection tools after irradiation with the aforementioned light was measured. * a * b * And measured L * a* b * Coordinate system. Regarding the measurement conditions, illumination type D65, observation field of view 2°, and concentration standard ANSI STATUS A were used. (The last sentence appears to be incomplete and possibly refers to a coordinate system.) * and b * As shown in the table.

[0530] [Color evaluation under no illumination]

[0531] The degree of color was visually confirmed for the ultraviolet inspection tools manufactured in each embodiment and comparative example immediately after manufacture and before the above-described evaluation of the colorimetric properties of light with a wavelength of 222 nm was performed.

[0532] A: Cases where the color is the same as the support, or cases where the color is faint but within acceptable limits.

[0533] B: Cases with colors that are significantly different from the support.

[0534] [Evaluation of visibility]

[0535] Visibility was evaluated using the evaluation results obtained above, based on the following evaluation criteria.

[0536] A: Satisfies a ΔE of 10.0 or higher, an A in "Color Evaluation under Unilluminated Conditions", and an a in "Hue". * "All conditions exceeding 0."

[0537] B: Satisfies a ΔE of 10.0 or higher, an A rating in "Color Evaluation under Unilluminated Conditions", and an a rating in "Hue". * "More than 1 or 2 of the conditions in 0. Except for the case where "ΔE" is less than 5.0."

[0538] C: "ΔE" is less than 5.0.

[0539] The table contains the following descriptions.

[0540] The "Specific Acid-Generating Agent / Specific Color-Generating Agent" column indicates the mass ratio of the content of the specific acid-generating agent to the content of the specific color-gener.

[0541] "Content of specific colorant / Area of ​​UV sensing layer (g / m²)" 2 The column “) indicates the content of chromophore per unit area relative to the ultraviolet sensing layer (g / m²)” indicates the amount of chromophore per unit area. 2 ).

[0542] The values ​​in parentheses listed together with the types of each component indicate the content (parts by mass) of each component.

[0543] [Table 1]

[0544]

[0545] [Table 2]

[0546]

[0547] As shown in the table above, the ultraviolet inspection tool of the present invention exhibits the desired effect.

[0548] It has been confirmed that when the color-generating agent comprises at least one of the compounds represented by formula (I), the compounds represented by formula (II), and their open-ring compounds, it exhibits superior performance in at least one of the following: color generating properties, color evaluation under no-irradiation conditions, and visibility at low irradiation levels (comparison of Examples 1-11 and Examples 15-20, etc.).

[0549] When it can be confirmed that a specific acid-producing agent contains a compound represented by formula (1), the colorimetric properties for light with a wavelength of 222 nm at low irradiation levels are superior (comparison of Examples 14 and 12, etc.).

[0550] It can be confirmed that when the ultraviolet inspection tool contains an adhesive, and the adhesive is a resin with hydroxyl groups, it is more effective in at least one of the following: colorimetric properties, color evaluation under no irradiation, and visibility under low irradiation intensity of 222nm light (comparison of Examples 15-21, etc.).

[0551] Symbol Explanation

[0552] 10-Ultraviolet inspection tool, 12-Support body, 14-Ultraviolet sensing layer.

Claims

1. An ultraviolet inspection tool having an ultraviolet sensing layer comprising a colorant and an acid-generating agent, The color-developing agent has at least one selected from the group consisting of lactone, lactam, sulfonyl lactone, sulfinolone and their open-ring structures, and azobenzene structures. The molecular weight of the acid-producing agent is below 600. The mass ratio of the acid-producing agent to the color-developing agent is 3.00 to 35.

00.

2. The ultraviolet inspection tool according to claim 1, wherein, The color-developing agent comprises at least one selected from the group consisting of compounds represented by formula (I), compounds represented by formula (II), and their open-ring compounds. In formula (I), Ar a1 and Ar a2 Each independently represents an aromatic ring optionally having substituents, R a1 and R a2 Each independently represents an alkyl group optionally having substituents, R a3 Indicates substituent, X a1 Indicates -O- or -NR a4 -, R a4 The atom represents a hydrogen atom, an alkyl group optionally having substituents, or an aryl group optionally having substituents; na represents an integer from 0 to 4. In equation (II), R b1 and R b3 Each of the following independently represents a hydrogen atom, an alkyl group optionally having substituents, or an aryl group optionally having substituents, R b2 and R b4 Each independently represents an alkyl group optionally having substituents or an aryl group optionally having substituents, X b1 Indicates -NR b5 -, R b5 Represents a hydrogen atom, an alkyl group optionally having substituents, or an aryl group optionally having substituents.

3. The ultraviolet inspection tool according to claim 1, wherein, The color-developing agent comprises at least one selected from the group consisting of compounds represented by formula (I), compounds represented by formula (III), and their open-ring compounds. The mass ratio of the acid-producing agent to the color-developing agent is 2.01 to 40.

00. In formula (I), Ar a1 and Ar a2 Each independently represents an aromatic ring optionally having substituents, R a1 and R a2 Each independently represents an alkyl group optionally having substituents, R a3 Indicates substituent, X a1 Indicates -O- or -NR a4 -, R a4 The atom represents a hydrogen atom, an alkyl group optionally having substituents, or an aryl group optionally having substituents; na represents an integer from 0 to 4. In equation (III), Ar c1 R represents an aromatic ring that optionally has substituents. c1 R represents a hydrogen atom, an alkyl group optionally having substituents, or an aryl group optionally having substituents. c2 X represents an alkyl group optionally having substituents or an aryl group optionally having substituents. c1 Indicates -O- or -NR c3 -, R c3 Represents a hydrogen atom, an alkyl group optionally having substituents, or an aryl group optionally having substituents.

4. The ultraviolet inspection tool according to claim 1, wherein, The color-developing agent comprises at least one selected from the group consisting of compounds represented by formula (IV) and their closed-ring compounds, and compounds represented by formula (V). In equation (IV), R d1 and R d2 R represents halogen atoms or alkyl groups optionally having substituents, each independently. d3 COO - M d + or SO3 - M d + M d + The nd1 and nd2 represent cations, and nd1 and nd2 represent integers from 0 to 4, respectively. In equation (V), R e1 and R e2 Each independently represents an alkyl group optionally having substituents, R e3 COO - M e + or SO3 - M e + M e + ne represents a cation, and ne represents 0 or 1.

5. The ultraviolet inspection tool according to any one of claims 1 to 4, wherein, The acid-producing agent comprises a compound that produces at least one acid selected from the group consisting of HBr, HI, HPF6, HSbF6 and perfluorosulfonic acid.

6. The ultraviolet inspection tool according to any one of claims 1 to 4, wherein, The acid-producing agent comprises at least one selected from the group consisting of organic halogen compounds, matte salt compounds, and iodine salt compounds.

7. The ultraviolet inspection tool according to claim 6, wherein, The acid-producing agent comprises at least one selected from the group consisting of compounds represented by formula (1) and triarylsulfonium salt compounds. R 1 -L 1 -CX 1 X 2 X 3 (1) In equation (1), R 1 L represents an aryl group optionally having substituents or a heteroaryl group optionally having substituents. 1 Indicates -SO- or -SO2-, X 1 ~X 3 Each can be represented independently as a hydrogen atom or a halogen atom, where X 1 ~X 3 Except for the case where all atoms are hydrogen atoms.

8. The ultraviolet inspection tool according to any one of claims 1 to 4, wherein, The colorant has a maximum absorption wavelength in the range of 200nm to 230nm.

9. The ultraviolet inspection tool according to any one of claims 1 to 4, further comprising an adhesive, The adhesive does not actually have aromatic rings.

10. The ultraviolet inspection tool according to any one of claims 1 to 4, wherein, The ultraviolet sensing layer also contains microcapsules. The microcapsule contains the color-generating agent and the acid-producing agent.

11. The ultraviolet inspection tool according to any one of claims 1 to 4, wherein, The content of the colorant is 0.010 g / m² relative to the area of ​​the ultraviolet sensing layer. 2 ~1.000g / m 2 .

12. The ultraviolet inspection tool according to any one of claims 1 to 4, wherein it senses ultraviolet light with a wavelength of 180 nm to 230 nm.

13. An ultraviolet inspection kit comprising the ultraviolet inspection tool according to any one of claims 1 to 12.

14. An ultraviolet inspection method, wherein the ultraviolet inspection tool according to any one of claims 1 to 12 is used to inspect ultraviolet light with a wavelength of 180 nm to 230 nm.

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