Testing tools, testing methods

Abstract

The present invention is capable of providing a test tool that allows easy testing of whether light that inactivates a virus or the like has been emitted and testing of whether light that is hazardous to the human body has been emitted. The test tool according to the present invention includes a first display part and a second display part. In the first display part, a visual change occurs between before and after the test tool has been irradiated with light having at least a wavelength in the wavelength range of 200-280 nm. In the second display part, a visual change does not occur between before and after the test tool has been irradiated with light having a wavelength in the wavelength range of 200-230 nm, but a visual change does occur between before and after the test tool has been irradiated with light having at least a wavelength in a wavelength range more than 230 nm but not more than 280 nm.

Description

Technical Field

[0001] The present invention relates to an inspection tool and an inspection method.

Background Art

[0002] In recent years, ultraviolet rays, particularly UV-C (wavelength 200 to 280 nm), have attracted attention for sterilizing viruses and the like. In the measurement of the ultraviolet irradiation dose, for example, in Patent Document 1, a method using a "UV label" (UV-H manufactured by NOF Corporation) and, in Patent Document 2, a method using a "UV scale" (manufactured by Fujifilm Corporation) are disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] On the other hand, it is known that UV-C includes wavelengths harmful to the human body, and there are also concerns about the effects of ultraviolet rays on the human body. Therefore, particularly when using UV-C in the presence of people, it is desirable to be able to inspect whether light that inactivates viruses and the like is irradiated and whether light harmful to the human body is irradiated. When the inventors of the present invention inspected whether light that inactivates viruses and the like is irradiated and whether light harmful to the human body is irradiated using conventionally known UV labels and UV scales, the UV labels and UV scales could not inspect both whether light that inactivates viruses and the like is irradiated and whether light harmful to the human body is irradiated.

[0005] In view of the above circumstances, the object of the present invention is to provide a testing device that can easily perform tests to determine whether light that inactivates viruses and the like has been irradiated, and whether light harmful to the human body has been irradiated. Furthermore, the present invention also aims to provide an inspection method. [Means for solving the problem]

[0006] The inventors of the present invention diligently studied and found that the above problems could be solved by the configuration shown below, and thus completed the present invention.

[0007] (1) An inspection device including a first display section and a second display section, The first display unit is a display unit that produces a visual change before and after irradiating the inspection tool with light of at least one wavelength in the range of 200 to 280 nm. An inspection device in which the second display unit is a display unit that does not produce a visual change before and after irradiating the inspection device with light of a wavelength in the range of 200 to 230 nm, but produces a visual change before and after irradiating the inspection device with light of at least one wavelength in the range of over 230 nm and up to 280 nm. (2) The inspection device described in (1), wherein the visual change is selected from the group consisting of a change in color, a change in pattern, a change in brightness, a change in illumination, and combinations thereof. (3) The second display unit includes a filter and a photosensitive unit that produces a visual change before and after receiving light of at least one wavelength in the range of wavelengths greater than 230 nm and less than or equal to 280 nm that has passed through the filter, The inspection device according to (1) or (2), wherein the filter blocks light in the wavelength range of 200 to 230 nm. (4) The inspection device described in (3), wherein the photosensitive part contains a color developer. (5) The inspection device includes a first light-receiving unit that receives light of at least one wavelength in the range of 200 to 280 nm, The device further includes a filter and a second light-receiving unit that receives light of at least one wavelength in the range of wavelengths greater than 230 nm and less than or equal to 280 nm that has passed through the filter, The filter blocks light in the wavelength range of 200-230nm. The first display unit produces a visual change in accordance with the amount of light received by the first light receiving unit. The inspection device described in (1) or (2), wherein the second display unit produces a visual change in accordance with the amount of light received by the second light receiving unit. (6) The transmittance of the filter at a wavelength of 222 nm is 5% or less. A test device as described in any of (3) to (5), wherein the transmittance of the filter at a wavelength of 254 nm is 50% or more. (7) The average transmittance of the filter at wavelengths of 200-230 nm is 1% or less. A testing device as described in any of (3) to (6), wherein the filter has an average transmittance of 50% or more at wavelengths of 230 to 280 nm. (8) The inspection device according to any one of (3) to (7), wherein the filter comprises a resin selected from the group consisting of triacetylcellulose, polyvinyl chloride, acrylic resin, methacrylic resin, polyurethane, and polyurea. (9) The second display unit has a second photosensitive unit that is not sensitive to light in the wavelength range of 200 to 230 nm, but produces a visual change before and after exposure to light of at least one wavelength in the range of over 230 nm and up to 280 nm, The inspection tool according to (1) or (2), wherein the second photosensitive part contains a compound that blocks light with a wavelength of 200 to 230 nm. (10) The transmittance of the compound that blocks light with wavelengths of 200-230 nm at a wavelength of 222 nm is 5% or less. The testing device described in (9), wherein the transmittance at a wavelength of 254 nm of a compound that blocks light with wavelengths of 200-230 nm is 50% or more. (11) The inspection tool according to (9) or (10), wherein the compound that blocks light with a wavelength of 200 to 230 nm has one substructure selected from the group consisting of an ester bond, a urethane bond, and a urea bond. (12) An inspection method using the inspection tool described in any of (1) to (11). [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a testing device that can easily perform tests to determine whether light that inactivates viruses and the like has been irradiated, and whether light harmful to the human body has been irradiated. Furthermore, the present invention can provide an inspection method. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic cross-sectional view showing an example of a first embodiment of the inspection tool. [Figure 2] This diagram illustrates the case where the inspection device is irradiated with light of a wavelength of 222 nm. [Figure 3] This is a plan view of the inspection device before it is irradiated with light of a wavelength of 222 nm. [Figure 4] This is a plan view of the inspection device after it has been irradiated with light of a wavelength of 222 nm. [Figure 5] This diagram illustrates the case where the inspection device is irradiated with light of wavelengths 222 nm and 254 nm. [Figure 6] This is a plan view of the inspection device before it is irradiated with light of wavelengths 222 nm and 254 nm. [Figure 7] This is a plan view of the inspection device after it has been irradiated with light of wavelengths 222 nm and 254 nm. [Figure 8] This figure shows other aspects of the visual changes in the inspection tool. [Figure 9] This figure shows other aspects of the visual changes in the inspection tool. [Figure 10] This figure shows another form of the inspection device. [Figure 11] This is a schematic cross-sectional view showing an example of a second embodiment of the inspection tool. [Modes for carrying out the invention]

[0010] The present invention will be described in detail below. The following description of the constituent elements may be based on a typical embodiment of the present invention, but the present invention is not limited to such embodiments. In this specification, a numerical range represented by "~" means a range that includes the numbers written before and after "~" as the lower and upper limits, respectively. Furthermore, in the numerical ranges described stepwise in this specification, the upper or lower limit stated in one numerical range may be replaced with the upper or lower limit of another numerical range described stepwise. Also, in the numerical ranges described in this specification, the upper or lower limit stated in one numerical range may be replaced with the value shown in the example. Furthermore, in this specification, "solids" refers to the components that form the composition layer using the composition, and if the composition contains a solvent (e.g., organic solvent and water), it refers to all components excluding the solvent. In addition, liquid components that form the composition layer are also considered to be solids. Furthermore, in this specification, ultraviolet light refers to light with a wavelength range of 10 to 400 nm. Furthermore, in this specification, (meth)acrylic means "at least one of acrylic and methacrylic." Furthermore, in this specification, "boiling point" means the boiling point at standard atmospheric pressure. In this specification, total light transmittance can be measured using a haze meter (e.g., NDH2000, manufactured by Nippon Denshoku Industries Ltd.) with a C light source.

[0011] The present invention relates to an inspection tool comprising a first display unit and a second display unit, wherein the first display unit is a display unit that produces a visual change before and after irradiating the inspection tool with light of at least one wavelength in the range of 200 to 280 nm, and the second display unit is a display unit that produces no visual change before and after irradiating the inspection tool with light of a wavelength in the range of 200 to 230 nm, but produces a visual change before and after irradiating the inspection tool with light of at least one wavelength in the range of over 230 nm and up to 280 nm. Furthermore, the occurrence of a visual change before and after irradiation with light refers to a visual change occurring when comparing the state before irradiation (unirradiated state) with the state after irradiation (irradiated state). However, "after irradiation" refers to the state from the unirradiated state to the irradiated state, and the concept includes the period during irradiation. Therefore, the inspection device of the present invention may be an inspection device in which a visual change occurs during light irradiation.

[0012] In the testing device of the present invention, the first display unit is a display unit that produces a visual change before and after irradiating the testing device with light of at least one wavelength in the range of 200 to 280 nm, making it easy to check whether light that inactivates viruses, etc. (light in the range of 200 to 280 nm) has been irradiated. Furthermore, the second display unit is a display unit that does not produce a visual change before and after irradiating the testing device with light of a wavelength in the range of 200 to 230 nm, but produces a visual change before and after irradiating the testing device with light of at least one wavelength in the range of over 230 nm and up to 280 nm, making it easy to check whether light harmful to the human body has been irradiated. For example, when a lamp that emits light with a wavelength of 222 nm deteriorates, it may emit light harmful to the human body with a wavelength of over 230 nm and up to 280 nm. In such cases, using the testing device of the present invention makes it easy to check whether the light emitted from the lamp being used has any effect on the human body. Below, we will first describe in detail the above-mentioned characteristics of the testing equipment.

[0013] The inspection tool of the present invention includes a first display unit and a second display unit. The inspection tool of the present invention may have the first display unit and the second display unit on the same component, or they may be on separate components. The visual changes in the first and second display units are not particularly limited as long as they are visually changing, but examples include changes in color, patterns, brightness, illumination, and combinations thereof (for example, a combination of color changes and pattern changes). Color changes include changes in hue and changes in color due to luminescence. Specifically, this includes changes from lighter colors to darker colors, and from darker colors to lighter colors. Pattern changes include changes in shapes, images, and forms. Specifically, this can include letters appearing on a plain background, shapes (illustrations or graphs) appearing on a plain background, numbers changing, letters changing, or shapes changing. A change in brightness refers to a change in luminous intensity, specifically, it can mean becoming brighter or dimmer. Changes in lighting include changes in the on / off state of the light source, such as turning on, blinking, and turning off. Specifically, this includes changes in the blinking pattern of the light source and changes in the pattern of lights that illuminate within an LED (light-emitting diode) array. As will be described later, when the first display unit and the second display unit are composed of displays, the above-mentioned visual change is made by the display on the display, and when the first display unit and the second display unit are composed of photosensitive units, the photosensitive units themselves may produce the above-mentioned visual change. The visual changes in the first display section and the visual changes in the second display section may be the same or different.

[0014] The shape of the inspection tool is not particularly limited; it may be in the form of a sheet, or various shapes such as rectangular prisms and cylindrical blocks can be used. Among these, sheet-shaped inspection tools are preferred. Furthermore, various shapes are available for the sheet-like inspection tool, including squares, rectangles, circles, ovals, and polygons other than quadrilaterals such as hexagons, as well as irregular shapes. Furthermore, the sheet-like inspection tool may also be long in length.

[0015] The lower limit of the thickness of the inspection tool is preferably 5 μm or more, and more preferably 25 μm or more. The upper limit of the thickness of the inspection tool is preferably 10 cm or less, and more preferably 2 cm or less.

[0016] [1st display section] The first display unit is a display unit that produces a visual change before and after irradiating the inspection tool with light of at least one wavelength in the range of 200 to 280 nm. The light source that emits light of at least one wavelength in the range of 200 to 280 nm is not particularly limited, but it is preferable to use a lamp with a maximum absorption wavelength of 207 nm or 222 nm as the light source, and it is more preferable to use a lamp with a maximum absorption wavelength of 222 nm as the light source. That is, the first display unit is preferably a display unit that produces a visual change before and after irradiating the inspection tool with light from a lamp with a maximum absorption wavelength of 222 nm as the light source. An example of a lamp with a maximum absorption wavelength of 222 nm is a KrCl excimer lamp, and an example of a lamp with a maximum absorption wavelength of 207 nm is a KrBr excimer lamp. In that respect, the first display unit has an irradiation dose of 0.1 mJ / cm² of light with a wavelength of 222 nm. 2 It is preferable that a visual change occurs before and after irradiation to the above extent. The irradiation dose of 222nm wavelength light that causes a visual change in the first display unit is 0.1 to 10 mJ / cm². 2 Preferably, 0.1 to 6 mJ / cm² 2 More preferably, 0.1 to 3 mJ / cm 2 More preferably, 0.1 to 1 mJ / cm 2 This is particularly preferable. The lower the irradiation dose, the better the sensitivity, indicating that a visual change occurs with less irradiation. Preferably, the first display unit exhibits a visual change before and after irradiation through a filter that blocks light with wavelengths greater than 230 nm and less than or equal to 280 nm. The statement that a visual change occurs before and after irradiation through a filter that blocks light with wavelengths greater than 230 nm and less than or equal to 280 nm also means that a visual change occurs even when irradiated with light that does not include the wavelength of 254 nm.

[0017] [Second display] The second display unit does not visually change before and after irradiating the inspection tool with light having a wavelength in the range of 200 to 230 nm, and visually changes before and after irradiating the inspection tool with light having at least one wavelength in the range of more than 230 nm and 280 nm or less. The light source that irradiates light having at least one wavelength in the range of more than 230 nm and 280 nm or less is not particularly limited, but it is preferable to use a lamp having a maximum absorption wavelength of 254 nm as the inspection tool. That is, the second display unit is preferably a display unit that visually changes before and after irradiating the inspection tool with light using a lamp having a maximum absorption wavelength of 254 nm as a light source. Examples of the lamp having a maximum absorption wavelength of 254 nm include low-pressure mercury lamps. In that regard, the second display unit preferably visually changes before and after irradiation such that the irradiation amount of light having a wavelength of 254 nm is 0.1 mJ / cm 2 or more. The irradiation amount of light having a wavelength of 254 nm that visually changes in the second display unit is preferably 0.1 to 10 mJ / cm 2 more preferably 0.1 to 6 mJ / cm 2 even more preferably 0.1 to 3 mJ / cm 2 still more preferably 0.1 to 1 mJ / cm 2 and particularly preferably 0.1 to 1 mJ / cm The second display unit does not visually change before and after irradiating the inspection tool with light having a wavelength in the range of 200 to 230 nm. As a means for ensuring that the second display unit does not visually change before and after irradiating the inspection tool with light having a wavelength in the range of 200 to 230 nm, there are methods such as using a member that does not become sensitive before and after irradiating the inspection tool with light having a wavelength in the range of 200 to 230 nm and becomes sensitive before and after irradiating the inspection tool with light having at least one wavelength in the range of more than 230 nm and 280 nm or less, and using a filter (hereinafter also referred to as filter X) that blocks light having a wavelength in the range of 200 to 230 nm. Hereinafter, specific embodiments will be given to describe the inspection tool in detail.

[0018] 〔First Embodiment〕 In the first embodiment of the inspection tool of the present invention, the first display unit has a first photosensitive unit that produces a visual change before and after exposure to light of at least one wavelength in the range of 200 to 280 nm, and the second display unit has a filter (filter X) that blocks light of 200 to 230 nm, and a second photosensitive unit A that produces a visual change before and after exposure to light of at least one wavelength in the range of over 230 nm and up to 280 nm that has passed through filter X. The first photosensitive section and the second photosensitive section A may be composed of the same material or different materials, as will be described later. The first display unit and the second display unit preferably have a support for supporting the first display unit and the second display unit. The support for the first display unit and the support for the second display unit may be the same or different.

[0019] A specific aspect of the first embodiment described above is shown in Figure 1. Figure 1 is a schematic cross-sectional view showing an example of the first embodiment of the inspection tool. The inspection tool 10 shown in Figure 1 has a support 12, a photosensitive part 14, and a filter 16 in that order. The filter 16 is positioned on a portion of the surface of the photosensitive part 14 opposite to the support 12 side. In other words, the filter 16 is positioned to cover a portion of the surface of the photosensitive part 14. In Figure 1, the filter 16 is positioned in contact with the photosensitive section 14, but the invention is not limited to this configuration, and other layers (for example, an adhesive layer and a bonding layer) may be placed between the filter 16 and the photosensitive section 14.

[0020] The photosensitive section 14 is a photosensitive section that is sensitive to any light with a wavelength of 200 to 280 nm and produces a visual change before and after exposure. In Figure 1, the photosensitive section 14 is shown to be sensitive to all light in the wavelength range of 200 to 280 nm, but the present invention is not limited to this embodiment, and as described above, it is sufficient to be sensitive to at least any wavelength in the wavelength range of 200 to 280 nm. Filter 16 corresponds to the aforementioned filter X and is a filter that blocks light with a wavelength of 200-230 nm. Filter 16 transmits at least some of the light in the wavelength range of 400-700 nm. In the inspection device 10, the area enclosed by the dashed line where only the support 12 and the photosensitive part 14 are laminated corresponds to the first display area 18, and the area enclosed by the dashed line where the support 12, the photosensitive part 14, and the filter X are laminated corresponds to the second display area 20.

[0021] The following describes the case where the inspection device 10 shown in Figure 1 is irradiated with light of a wavelength of 222 nm. As shown in Figure 2, light with a wavelength of 222 nm is shone from the side of the inspection tool 10 where the filter 16 is located, as indicated by the white arrow. In the photosensitive area 14A that is not covered by the filter 16 of the inspection tool 10, as shown in Figure 2, light with a wavelength of 222 nm is shone on it, and the photosensitive area 14A is exposed to light. In contrast, in the photosensitive area 14B that is not covered by the filter 16 of the inspection tool 10, as shown in Figure 2, the light with a wavelength of 222 nm is blocked by the filter 16, and since light with a wavelength of 222 nm does not reach the photosensitive area 14B, the photosensitive area 14B is not exposed to light. Here, we assume that the photosensitive part 14 visually changes from white to black before and after being exposed to light in the wavelength range of 200 to 280 nm. As shown in Figure 3, when the inspection tool 10 is first viewed from the normal direction before being irradiated with light of wavelength 222 nm, both the photosensitive parts 14A and 14B in the photosensitive part 14 contained in the inspection tool 10 are white. In contrast, as shown in Figure 2 above, after irradiating the inspection tool 10 with light of wavelength 222 nm, as shown in Figure 4, the photosensitive part 14A in the photosensitive part 14 contained in the inspection tool 10 is exposed to light of wavelength 222 nm and changes to black, while the photosensitive part 14B remains white because it is not exposed to light of wavelength 222 nm due to the filter 16. Therefore, if the light irradiated onto the testing device 10 includes light with a wavelength of 222 nm, which can contribute to the inactivation of viruses, etc., and does not include light in the range of wavelengths between 230 nm and 280 nm, which is harmful to the human body, the testing device will show a visual change as shown in Figure 4. Thus, it is easy to test that the irradiated light includes light with wavelengths that can contribute to the inactivation of viruses, etc., but does not include light in the range of wavelengths between 230 nm and 280 nm that is harmful to the human body.

[0022] Next, we will explain the case where the inspection device 10 shown in Figure 1 is irradiated with light containing wavelengths of 222 nm and 254 nm. Both wavelengths of light, 222 nm and 254 nm, can contribute to the inactivation of viruses, etc., but the wavelength of 254 nm is a wavelength of light that is harmful to the human body. As shown in Figure 5, the inspection device 10 is irradiated with light containing wavelengths of 222 nm and 254 nm from the side where the filter 16 is located. In Figure 5, the white arrows represent irradiation with 222 nm light, and the black arrows represent irradiation with 254 nm light. In the photosensitive area 14A that is not covered by the filter 16 of the inspection device 10, as shown in Figure 5, both 222 nm and 254 nm light are irradiated, and the photosensitive area 14A is exposed. In contrast, in the photosensitive area 14B that is not covered by the filter 16 of the inspection device 10, as shown in Figure 5, the 222 nm light is blocked by the filter 16, but the 254 nm light passes through the filter 16, so the photosensitive area 14B is exposed. Here, we assume that the photosensitive part 14 visually changes from white to black before and after being exposed to light in the wavelength range of 200 to 280 nm. As shown in Figure 6, before irradiating the inspection tool 10 with light containing wavelengths of 222 nm and 254 nm, both the photosensitive parts 14A and 14B in the photosensitive part 14 contained in the inspection tool 10 are white. In contrast, as shown in Figure 5, after irradiating the inspection tool 10 with light containing both wavelengths of 222 nm and 254 nm, as shown in Figure 7, the photosensitive part 14A in the photosensitive part 14 contained in the inspection tool 10 becomes black after being exposed to both wavelengths of 222 nm and 254 nm, and the photosensitive part 14B also becomes black after being exposed to the 254 nm light. Therefore, if the light irradiated onto the testing device 10 includes light with wavelengths of 222 nm and 254 nm, which can contribute to the inactivation of viruses, and also includes light with a wavelength of 254 nm, which is harmful to the human body, the testing device will show a visual change as shown in Figure 7. This makes it easy to test whether the irradiated light contains light with wavelengths that can contribute to the inactivation of viruses, as well as light with wavelengths of 254 nm, which is harmful to the human body.

[0023] In Figure 4 above, the photosensitive portion 14A is shown to visually change from white to black when exposed to light in the wavelength range of 200 to 280 nm. However, the present invention is not limited to this embodiment, and any embodiment that produces a visual change as described above is acceptable. For example, as shown in Figure 8, the photosensitive portion 14A may change to produce a striped pattern, or as shown in Figure 9, the photosensitive portion 14A may change to produce a pattern that displays the word "disinfection". Such embodiments are achieved by placing the light-emitting agent and photoactivator described later only in the parts that produce the change.

[0024] Furthermore, although Figure 1 shows a configuration in which the photosensitive section 14A and the photosensitive section 14B are connected, the configuration is not limited to this, and for example, as shown in Figure 10, the photosensitive section 14A and the photosensitive section 14B may be prepared as separate components. In the inspection tool 30 shown in Figure 10, a sheet including the support 12 and the photosensitive section 14A, and a sheet including the support 12, the photosensitive section 14B and the filter 16 are prepared separately, and these two sheets are arranged on the holding substrate 22.

[0025] The following describes in detail each component of the first embodiment of the inspection device.

[0026] <<Support>> Examples of support materials 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 material, resin sheets or synthetic paper are more preferred, and resin sheets are even more preferred. Examples of resin sheet materials include polyethylene resins, polypropylene resins, cyclic polyolefin resins, polystyrene resins, acrylonitrile-styrene copolymers, acrylonitrile-butadiene-styrene copolymers, polyvinyl chloride resins, fluororesins, poly(meth)acrylic resins, polycarbonate resins, polyester resins (polyethylene terephthalate and polyethylene naphthalate, etc.), various types of polyamide resins such as nylon, polyimide resins, polyamide-imide resins, polyarylphthalate resins, silicone resins, polysulfone resins, polyphenylene sulfide resins, polyethersulfone resins, polyurethane resins, acetal resins, and cellulose resins. As a support, a resin that absorbs light at a wavelength of 222 nm and transmits light at a wavelength of 254 nm (for example, triacetylcellulose (TAC) sheet), as described later, is also preferred. Examples of synthetic paper include those made by biaxially stretching polypropylene or polyethylene terephthalate to form numerous microvoids (such as Yupo), those made using synthetic fibers such as polyethylene, polypropylene, polyethylene terephthalate, and polyamide, and those made by laminating these onto a part, one side, or both sides of a paper.

[0027] Another preferred embodiment of the resin sheet is a white resin sheet in which a white pigment is dispersed in the resin. The resin material in the above white resin sheet is the same as the material for the resin sheet described above.

[0028] As white resin sheets and white pigments, reference can be made to the white resin films and white pigments described in paragraph 0080 of International Publication No. 2016 / 017701, which are incorporated herein by reference. The white resin sheet is preferably a white polyester sheet, and more preferably a white polyethylene terephthalate sheet. Examples of commercially available white resin sheets include Yupo (manufactured by Yupo Corporation), Lumirror (manufactured by Toray Industries), and Crisper (manufactured by Toyobo Co., Ltd.).

[0029] The lower limit of the support thickness 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.

[0030] <<First photosensitive section>> The first photosensitive area exhibits a visual change before and after exposure to light of at least one wavelength in the range of 200 to 280 nm (hereinafter also referred to as "specific ultraviolet X"). Preferably, the first photosensitive area is exposed to light of at least 222 nm. The first photosensitive area may be exposed to multiple wavelengths of light in the range of 200 to 280 nm, or it may be exposed to all wavelengths of light in the range of 200 to 280 nm. The first photosensitive section preferably contains a color developer, and more preferably contains both a color developer and a photoactivator, as this can further improve sensitivity to light with a wavelength of 222 nm. The main color development mechanism when a photoactivator and a color developer are present is presumed to be as follows: The photoactivator absorbs specific ultraviolet X and becomes activated, generating acids and / or radicals, and the color developer reacts with these acids and / or radicals to produce color. At this time, the amount of acids and / or radicals generated from the photoactivator varies depending on the amount of specific ultraviolet X irradiated, and the amount of color developer that produces color also varies depending on the amount of acids and / or radicals generated from the photoactivator. As a result, in the area of ​​the first photosensitive part irradiated with specific ultraviolet X, variations in color intensity occur depending on the amount of specific ultraviolet X irradiated, and a colored area is formed with a color intensity corresponding to the amount of specific ultraviolet X irradiated. Therefore, when the first photosensitive section is irradiated with specific ultraviolet X, a colored section (colored image) is formed in the irradiated area (ultraviolet irradiated area) with a color density corresponding to the amount of specific ultraviolet X irradiated (e.g., integrated illuminance). Coloring with a color density corresponding to the amount of specific ultraviolet X irradiated means that the colored image has gradation corresponding to the amount of specific ultraviolet X irradiated.

[0031] (Coloring agent) A coloring agent refers to a compound that changes color or color due to the action of acid, oxidation, or light irradiation. In the following explanation, "color development" is a concept that includes both coloring and color change. Coloring includes the development of color from a substantially colorless state (a state that is colorless or exhibits a weak color) due to the action of acid, oxidation, or light irradiation. Color change also includes the change of color from one color to another due to the effect of acid, oxidation, or light irradiation (for example, a change from yellow to red). The type of colorant is not particularly limited; examples include colorants that develop color through oxidation, colorants that develop color through the action of acid, and colorants that develop color through the action of light. Among these, colorants that develop color through oxidation or colorants that develop color through the action of acid are preferred. As a colorant, leuco dyes or photochromic dyes are preferred, with leuco dyes being more preferred. Known photochromic dyes include compounds that isomerize and produce color upon the action of light, compounds that absorb light and emit light of a different wavelength than the absorbed wavelength (also called luminescent dyes), compounds that undergo a ring-closing reaction upon the action of light and produce color, and compounds that undergo a ring-opening reaction upon the action of light. Known photochromic dyes can be used. Preferably, the photochromic dye is one in which the color-development and decolorization reactions proceed reversibly with energy. Examples of luminescent dyes include coumarin derivatives and rhodamine derivatives such as rhodamine B.

[0032] The leuco dyes described above are preferably compounds that develop color upon oxidation from a substantially colorless state (hereinafter also referred to as "oxidative leuco dyes") or compounds that develop color upon the action of an acid from a substantially colorless state (hereinafter also referred to as "acid-activated leuco dyes"). Examples of leuco dyes include triarylmethane phthalide compounds, fluorane compounds, phenothiazine compounds, indolylphthalide compounds, azaindolylphthalide compounds, leucoauramine compounds, rhodamine lactam compounds, triarylmethane compounds, diarylmethane compounds, triazene compounds, spiropyran compounds, thiazine compounds, and fluorene compounds. For further details on the above compounds, please refer to U.S. Patent No. 3,445,234, Japanese Patent Publication No. 5-257,272, and paragraphs 0029-0034 of International Publication No. 2009 / 8248. The colorants may be used individually or in combination of two or more types.

[0033] • Oxidative leuco dyes One preferred embodiment of an oxidative leuco dye is a compound having one or two hydrogen atoms that develops color by removing electrons. Examples of such oxidative color-developing leuco dyes include (a) aminotriarylmethane, (b) aminoxanthine, (c) aminothioxanthine, (d) amino-9,10-dihydroacridine, (e) aminophenoxazine, (f) aminophenothiazine, (g) aminodihydrophenazine, (h) aminodiphenylmethane, (i) leucoindamine, (j) aminohydrocinnamic acid (cyanethane, leucometine), (k) hydrazine, (l) leucoin dicoid dye, (m) amino-2,3-dihydroanthraquinone, (n) tetrahalo-p,p'-biphenol, (o) 2-(p-hydroxyphenyl)-4,5-diphenylimidazole, and (p) phenethylaniline, as described in U.S. Patent No. 3445234. Of the above (a) to (p), (a) to (i) produce color by losing one hydrogen atom, while (j) to (p) produce color by losing two hydrogen atoms.

[0034] Of these, aminoarylmethane is preferred, aminotriarylmethane is more preferred, and 4-dialkylaminotriarylmethane is even more preferred.

[0035] Specific examples of oxidative leuco dyes include tris(4-dimethylaminophenyl)methane, tris(4-diethylaminophenyl)methane, bis(4-diethylaminophenyl)-(4-diethylamino-2-methylphenyl)methane, bis(4-diethylamino-2-methylphenyl)-(4-diethylaminophenyl)methane, bis(1-ethyl-2-methylindole-3-yl)-phenylmethane, 2-N-(3-trifluoromethylphenyl)-N-ethylamino-6-diethylamino-9-(2-methoxycarbonylphenyl)xanthene, and 2-(2-chlorophenyl)amino-6 Examples include -dibutylamino-9-(2-methoxycarbonylphenyl)xanthene, 2-dibenzyamino-6-diethylamino-9-(2-methoxycarbonylphenyl)xanthene, benzo[a]-6-N,N-diethylamino-9,2-methoxycarbonylphenylxanthene, 2-(2-chlorophenyl)-amino-6-dibutylamino-9-(2-methylphenylcarboxyamidephenyl)xanthene, 3,6-dimethoxy-9-(2-methoxycarbonyl)-phenylxanthene, benzoylleucomethylene blue, and 3,7-bis-diethylaminophenoxazine.

[0036] • Acid-developing leuco dyes One preferred embodiment of an acid-chromogenic leuco dye is a compound that develops color by donating electrons or accepting protons such as acids. Specifically, examples include compounds having a partial skeleton such as lactones, lactams, saltons, spiropyrans, esters, and amides, in which these partial skeletons undergo ring-opening or cleavage upon contact with an acid or proton. Examples of leuco dyes that develop color through the action of acid (acid-chromogenic leuco dyes) include 3,3-bis(2-methyl-1-octyl-3-indolyl)phthalide, 6'-(dibutylamino)-2'-bromo-3'-methylspiro[phthalide-3,9'-xanthene], 3-(4-diethylamino-2-ethoxyphenyl)-3-(1-ethyl-2-methylindole-3-yl)-4-azaphthalide, and 3-(4-diethylamino-2-ethoxyphenyl) Nyl)-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-xylidino)-fluorane, 2-(2-chloroanilino)-6-dibutylaminofluorane, 3,3-bis(4 -dimethylaminophenyl)-6-dimethylaminophthalide, 2-anilino-6-diethylamino-3-methylfluorane, 9-[ethyl(3-methylbutyl)amino]spiro[12H-benzo[a]xanthene-12,1'(3'H)isobenzofuran]-3'-one, 2'-methyl-6'-(Np-tolyl-N-ethylamino)spiro[isobenzofuran-1(3H),9'-[9H]xanthene]-3'-one, 3',6'-bis(diethylamino) Examples include tylamino)-2-(4-nitrophenyl)spiro[isoindole-1,9'-xanthene]-3-one, 9-(N-ethyl-N-isopentylamino)spiro[benzo[a]xanthene-12,3'-phthalide], 2'-anilino-6'-(N-ethyl-N-isopentylamino)-3'-methylspiro[phthalide-3,9'-[9H]xanthene], and 6'-(diethylamino)-1',3'-dimethylfluorane.

[0037] The colorant is preferably a compound having either an indolylphthalide structure or an azaindolylphthalide structure, and more preferably a compound having an indolylphthalide structure, in terms of exhibiting superior effects of the present invention. Compounds having an indolylphthalide structure are compounds that have an indolylphthalide structure as a substructure. As mentioned above, compounds having an indolylphthalide structure (indolylphthalide compounds) and compounds having an azaindolylphthalide structure (azaindolylphthalide compounds) function as colorants. In other words, the above compounds fall under the category of colorants having an indolylphthalide structure (particularly acid colorants) and colorants having an azaindolylphthalide structure.

[0038] The number of indolyl phthalide structures in a compound having an indolyl phthalide structure is not particularly limited; there may be one or more. However, two or more are preferred, and two are more preferred, in terms of achieving superior effects according to the present invention.

[0039] As for compounds having an indolylphthalide structure, compounds represented by general formula (B) are preferred.

[0040] [ka]

[0041] In general formula (B), R b1 ~R b4 Each of these independently represents a hydrogen atom or an alkyl group which may have substituents. R b1 and R b3 The number of carbon atoms in the alkyl group represented is not particularly limited, but 1 to 30 is preferred, 1 to 20 is more preferred, 1 to 12 is even more preferred, and 5 to 10 is particularly preferred in terms of achieving superior effects of the present invention. R b2 and R b4 The number of carbon atoms in the alkyl group represented is not particularly limited, but 1 to 10 is preferred, 1 to 5 is more preferred, and 1 to 3 is even more preferred in terms of superior effects of the present invention. In particular, the present invention has superior effects, R b1 ~R b4 Preferably, alkyl groups may have substituents, and more preferably, unsubstituted alkyl groups.

[0042] X b is -O- or -NR b5 - represents In particular, the present invention offers superior effects, X b -O- is preferred as the form. R b5 This represents a hydrogen atom, an optionally substituted alkyl group, or an optionally substituted aryl group. R b5 The number of carbon atoms in the alkyl group represented by is not particularly limited, but 1 to 10 is preferred, and 1 to 5 is more preferred, in terms of superior effects of the present invention. R b5 The aryl group represented by may be a monocyclic or bicyclic structure.

[0043] The molecular weight of the compound represented by general formula (B) is not particularly limited, but is preferably 300 or more, and more preferably 500 or more. There is no particular upper limit, but is preferably 2000 or less, and more preferably 1000 or less.

[0044] The amount of colorant in the first photosensitive section is not particularly limited, but in terms of excellent color sensitivity at a wavelength of 222 nm, the unit area (m²) is 2 0.500g / m² 2 The following is preferred: 0.300 g / m 2 The following is more preferable: 0.140 g / m 2 The following is even more preferable: 0.070 g / m 2 The following are particularly preferred. There is no particular lower limit, but 0.020 g / m³ is preferable. 2 The above is preferable, and 0.030 g / m 2 The above is more preferable. By setting the content of the colorant in the first photosensitive section to the above range, excessive absorption at 222 nm by the colorant is suppressed, so the minimum amount of colorant required for the color reaction can be used, and it is presumed that this results in excellent color sensitivity at a wavelength of 222 nm. The content of the above-mentioned colorant can be calculated by immersing the first photosensitive section in methanol for two days and then analyzing the resulting solvent by liquid chromatography. Ensure that the methanol does not evaporate during the immersion period. If necessary, a calibration curve for the content of the colorant to be detected may be created before the liquid chromatography measurement. The measurement conditions for liquid chromatography are as follows: Equipment: Shimadzu Corporation Nexera Column: Capcell pak C18 UG-120 Eluent: Water / Methanol Oven: 40℃ Injection: 5μL Detection: Maximum absorption wavelength of the colorant to be detected Flow rate: 0.2mL / min

[0045] (Photoactivator) The photoactivator is preferably a compound that is activated by light, and more preferably a photoactivator that, when activated by light, acts on a colorant to produce color. The photoactivator is preferably activated by light of at least one wavelength in the range of 200 to 280 nm, and preferably by light of at least 222 nm. The photoactivator may be activated by multiple wavelengths of light in the range of 200 to 280 nm, or it may be activated by light of all wavelengths in the range of 200 to 280 nm.

[0046] The photoactivator is preferably one or more of either a photooxidizing agent or a photoacid generator. If the first photosensitive part contains a coloring agent that develops color through oxidation, the photoactivator is preferably a photooxidizing agent, and if the first photosensitive part contains a coloring agent that develops color through the action of an acid, the photoactivator is preferably a photoacid generator. The mass ratio of the photoactivator content to the chromogen content (photoactivator / chromogen (mass ratio)) is preferably greater than 1.00, more preferably 3.00 or higher, even more preferably 8.00 or higher, and particularly preferably 10.00 or higher, in terms of achieving superior effects of the present invention. There is no particular upper limit, but it is preferably 40.00 or lower, more preferably 30.00 or lower, even more preferably 25.00 or lower, and particularly preferably 20.00 or lower. By setting the mass ratio of the photoactivator content to the chromogen content within the above range, excessive absorption of 222nm light by the chromogen is suppressed, and the photoactivator efficiently absorbs 222nm light, allowing the color reaction to proceed efficiently and resulting in excellent sensitivity to 222nm light. The mass ratio of the photoactivator content to the chromogenic agent content can be measured by methanol extraction and liquid chromatography, similar to the chromogenic agent content described above. The photoactivator is detected at the maximum absorption wavelength of the photoactivator being detected, and the chromogenic agent is detected at the maximum absorption wavelength of the chromogenic agent being detected, and their mass ratio is determined.

[0047] • Photooxidizing agent The photooxidizing agent is preferably a compound that can cause the colorant to exhibit color by being activated by ultraviolet light, generating radicals, and / or by abstracting hydrogen atoms from the colorant. The photooxidizing agent is preferably one or more of a radical generator and an organic halogen compound. It is also preferable to use a combination of a radical generator and an organic halogen compound as the photooxidizing agent. When a radical generator and an organic halogen compound are used in combination, the ratio of the radical generator to the organic halogen compound (radical generator / organic halogen compound (mass ratio)) is preferably 0.1 to 10, and more preferably 0.5 to 5, in terms of providing better gradation of the colored area.

[0048] Radical Generator As a radical generator, a compound that generates radicals when activated by ultraviolet light is preferred, a compound that generates radicals when activated by light of at least one wavelength in the range of 200 to 280 nm is more preferred, and a compound that generates radicals when activated by light of at least 222 nm is even more preferred. The radical generator may also be a compound that generates radicals when activated by light of multiple wavelengths in the range of 200 to 280 nm, or a compound that generates radicals when activated by light of all wavelengths in the range of 200 to 280 nm. As a radical generator, a hydrogen abstraction type radical generator is preferred. Hydrogen abstraction type radical generators exhibit the effect of abstracting hydrogen atoms from the colorant, thereby promoting the oxidation of the colorant. Examples of radical generators include azide polymers described on page 55 of the abstract of the 1968 Spring Research Conference of the Photographic Society of Japan; azide compounds such as 2-azidobenzoxazole, benzoyl azide, and 2-azidobenzimidazole described in U.S. Patent No. 3,282,693; 3'-ethyl-1-methoxy-2-pyridothiacyanine perchlorate and 1-methoxy-2-methylpyridinium p-toluenesulfonate described in U.S. Patent No. 3,615,568; rhofin dimer compounds such as 2,4,5-triarylimidazole dimers described in Japanese Patent Publication No. 62-039728; benzophenone; p-aminophenyl ketone; polynuclear quinone; thioxanthenon; and others. In particular, one or more selected from rofindimer and benzophenone are preferred, with rofindimer being more preferred. Examples of rhofin dimers include hexaarylbiimidazole compounds. Examples of hexaarylbiimidazole compounds include those described in paragraph 0047 of International Publication No. 2016 / 017701, which are incorporated herein by reference. Among these, 2,2'-bis(2-chlorophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole is preferred. Examples of 2,2'-bis(2-chlorophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole that can be used include "B-IMD" (manufactured by Kurogane Kasei Co., Ltd.) and "B-CIM" (manufactured by Hodogaya Chemical Industry Co., Ltd.).

[0049] The radical generator may be used alone or in a mixture of two or more types.

[0050] • Organic halogen compounds Organic halogen compounds can accelerate the oxidation of colorants. As for the organic halogen compound, compounds with three or more halogen atoms in the molecule are preferred because they exhibit superior gradation of color in the colored area. The upper limit for the number of halogen atoms is preferably nine or less. Note that the organic halogen compound is a compound other than rhofin dimers and benzophenone. Organic halogen compounds may be used individually or in combination of two or more types. Examples of organic halogen compounds include those represented by the following general formulas (2) to (7).

[0051] P 0 -CX3(2) In the formula, P 0 X represents a hydrogen atom, a halogen atom, an optionally substituted alkyl group, or an optionally substituted aryl group. Each X independently represents a halogen atom. P 0 Examples of halogen atoms represented by X include fluorine, chlorine, bromine, and iodine atoms, with chlorine or bromine atoms being preferred. P 0 Examples of substituents that alkyl and aryl groups represented by can have include hydroxyl groups, halogen atoms, C1-C6 alkyl groups, C1-C6 haloalkyl groups, acetyl groups, and C1-C6 alkoxy groups.

[0052] Examples of compounds represented by general formula (2) include trichloromethane, tribromomethane, carbon tetrachloride, carbon tetrabromide, p-nitrobenzotribromide, bromotrichloromethane, pencitrichloride, hexabromoethane, iodoform, 1,1,1-tribromo-2-methyl-2-propanol, 1,1,2,2-tetrabromoethane, 2,2,2-tribromoethanol, and 1,1,1-trichloro-2-methyl-2-propanol.

[0053] [ka]

[0054] In the formula, R represents a substituent, and x represents an integer between 0 and 5.

[0055] Examples of substituents represented by R include nitro groups, halogen atoms, C1-C3 alkyl groups, C1-C3 haloalkyl groups, acetyl groups, haloacetyl groups, and C1-C3 alkoxy groups. Note that if there are multiple R values ​​in an expression, the R values ​​may be the same or different from each other.

[0056] For x, an integer between 0 and 3 is preferable.

[0057] Examples of compounds represented by general formula (3) include o-nitro-α,α,α-tribromoacetophenone, m-nitro-α,α,α-tribromoacetophenone, p-nitro-α,α,α-tribromoacetophenone, α,α,α-tribromoacetophenone, and α,α,α-tribromo-3,4-cycloloacetophenone.

[0058] R 1 -SO2-X 1 (4)

[0059] In the formula, R 1X represents an optionally substituted alkyl group or an optionally substituted aryl group. 1 This represents a halogen atom.

[0060] R 1 The alkyl group represented is preferably an alkyl group having 1 to 20 carbon atoms, more preferably an alkyl group having 1 to 10 carbon atoms, and even more preferably an alkyl group having 1 to 6 carbon atoms. R 1 The aryl group represented by is preferably an aryl group having 6 to 20 carbon atoms, more preferably an aryl group having 6 to 14 carbon atoms, and even more preferably an aryl group having 6 to 10 carbon atoms. R 1 Examples of substituents that alkyl and aryl groups represented by may have include nitro groups, halogen atoms, C1-C3 alkyl groups, C1-C3 haloalkyl groups, acetyl groups, haloacetyl groups, and C1-C3 alkoxy groups. X 1 Examples of halogen atoms represented include fluorine atoms, chlorine atoms, bromine atoms, and iodine atoms, with chlorine atoms, bromine atoms, or iodine atoms being preferred, and chlorine atoms or bromine atoms being more preferred.

[0061] Examples of compounds represented by general formula (4) include 2,4-dinitrobenzenesulfonyl chloride, o-nitrobenzenesulfonyl chloride, m-nitrobenzenesulfonyl chloride, 3,3'-diphenylsulfondisulfonyl chloride, ethanesulfonyl chloride, p-bromobenzenesulfonyl chloride, p-nitrobenzenesulfonyl chloride, p-3-benzenesulfonyl chloride, p-acetamidobenzenesulfonyl chloride, p-chlorobenzenesulfonyl chloride, p-toluenesulfonyl chloride, methanesulfonyl chloride, and hensensulfonyl bromide.

[0062] R 2 -SX 2 (5)

[0063] In the formula, R2 X represents an optionally substituted alkyl group or an optionally substituted aryl group. 2 This represents a halogen atom.

[0064] R 2 The alkyl group which may have substituents and the aryl group which may have substituents, represented by the general formula (4) R 1 It is the same as the previous one, and the preferred embodiment is also the same. X 2 Examples of halogen atoms represented include fluorine atoms, chlorine atoms, bromine atoms, and iodine atoms, with chlorine atoms, bromine atoms, or iodine atoms being preferred, and chlorine atoms or bromine atoms being more preferred.

[0065] Examples of compounds represented by general formula (5) include 2,4-dinitrobenzenesulfenyl chloride and o-nitrobenzenesulfenyl chloride.

[0066] R 3 -L 1 -CX 3 X 4 X 5 (6)

[0067] In the formula, R 3 L represents an optionally substituted aryl group or an optionally substituted heteroaryl group. 1 This represents -SO- or SO2-. 3 , X 4 , and, X 5 Each of these independently represents either a hydrogen atom or a halogen atom. However, X 3 , X 4 , and, X 5 Not all of them are hydrogen atoms.

[0068] R 3 The aryl group represented by is preferably an aryl group having 6 to 20 carbon atoms, more preferably an aryl group having 6 to 14 carbon atoms, and even more preferably an aryl group having 6 to 10 carbon atoms. R 3The heteroaryl group represented by is preferably a heteroaryl group having 4 to 20 carbon atoms, more preferably a heteroaryl group having 4 to 13 carbon atoms, and even more preferably a heteroaryl group having 4 to 9 carbon atoms. R 3 Examples of substituents that the aryl group and heteroaryl group represented by may have include a nitro group, a halogen atom, a C1-C3 alkyl group, a C1-C3 haloalkyl group, an acetyl group, a haloacetyl group, and a C1-C3 alkoxy group.

[0069] X 3 , X 4 , and, X 5 Examples of halogen atoms represented include fluorine atoms, chlorine atoms, bromine atoms, and iodine atoms, with chlorine atoms, bromine atoms, or iodine atoms being preferred, and chlorine atoms or bromine atoms being more preferred.

[0070] Examples of compounds represented by general formula (6) 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-cymethylpyrimidine-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, with trichloromethylphenyl sulfone or tribromomethylphenyl sulfone (BMPS) being preferred.

[0071] R 4 CX 6 X 7 X 8 (7)

[0072] In the formula, R 4 X represents a heteroaryl group which may have substituents. 6 , X 7 , and, X 8 Each of these independently represents either a hydrogen atom or a halogen atom. However, X 6 , X 7 , and, X 8 Not all of them are hydrogen atoms.

[0073] R 4 The heteroaryl group represented by is preferably a heteroaryl group having 4 to 20 carbon atoms, more preferably a heteroaryl group having 4 to 13 carbon atoms, and even more preferably a heteroaryl group having 4 to 9 carbon atoms. R 4 Examples of substituents that the heteroaryl group represented by may have include a nitro group, a halogen atom, a C1-C3 alkyl group, a C1-C3 haloalkyl group, an acetyl group, a haloacetyl group, and a C1-C3 alkoxy group. X 6 , X 7 , and, X 8 Examples of halogen atoms represented include fluorine atoms, chlorine atoms, bromine atoms, and iodine atoms, with chlorine atoms, bromine atoms, or iodine atoms being preferred, and chlorine atoms or bromine atoms being more preferred.

[0074] Examples of compounds represented by general formula (7) include tribromoquinaldine, 2-tribromomethyl-4-methylquinoline, 4-tribromomethylpyrimidine, 4-phenyl-6-tribromomethylpyrimidine, 2-trichloromethyl-6-nitrobenzothiazole, 1-phenyl-3-trichloromethylpyrazole, 2,5-ditribromomethyl-3,4-dibromothiophene, 2-trichloromethyl-3-(p-butoxystyryl)-1,3,4-oxadiazole, 2,6-didrichloromethyl-4-(p-methoxyphenyl)-triazine, and 2-(4-methylphenyl)-4,6-bis(trichloromethyl)-1,3,5-triazine.

[0075] Among these, the compounds represented by general formula (3), general formula (6), or general formula (7) are preferred as organic halogen compounds, with the compound represented by general formula (6) being more preferred due to its excellent sensitivity at a wavelength of 222 nm. The reason for the excellent sensitivity at a wavelength of 222 nm is not clear, but it is presumed that the compound represented by general formula (6) has good compatibility with the wavelength of 222 nm. The halogen atoms in the above compound are preferably chlorine atoms, bromine atoms, or iodine atoms, with chlorine atoms or bromine atoms being more preferred.

[0076] • Photoacid generator The photoacid generator is preferably a compound that cleaves upon exposure to ultraviolet light to generate acid, and the resulting acid can cause the coloring agent to exhibit color. More preferably, the photoacid generator is a compound that generates acid upon exposure to light of at least one wavelength in the range of 200 to 280 nm, and the resulting acid can cause the coloring agent to exhibit color. Even more preferably, the photoacid generator is a compound that generates acid upon exposure to light of at least 222 nm, and the resulting acid can cause the coloring agent to exhibit color. The photoacid generator may be a compound that cleaves and generates acid when exposed to light of multiple wavelengths in the range of 200 to 280 nm, or it may be a compound that cleaves and generates acid when exposed to light of all wavelengths in the range of 200 to 280 nm. Examples of photoacid generators include nonionic photoacid generators and ionic photoacid generators, with nonionic photoacid generators being preferred in terms of superior effects of the present invention. Examples of nonionic photoacid generators include organic halogen compounds and oxime compounds, with organic halogen compounds being preferred in terms of superior effects of the present invention, and the compound represented by the above-mentioned general formula (6) being even more preferred. As for organic halogen compounds, compounds with three or more halogen atoms in the molecule are preferred because they exhibit superior gradation of color in the colored area. The upper limit for the number of halogen atoms is preferably nine or less. Organic halogen compounds may be used individually or in combination of two or more types. Specific examples of organic halogen compounds include the same organic halogen compounds listed as photo-oxidizing agents in the upper section.

[0077] Examples of ionic photoacid generators include diazonium salts, iodonium salts, and sulfonium salts, with iodonium salts or sulfonium salts being preferred. Examples of ionic photoacid colorants include compounds described in Japanese Patent Publication No. 62-161860, Japanese Patent Publication No. 61-067034, and Japanese Patent Publication No. 62-050382, the contents of which are incorporated herein by reference. Furthermore, there are no particular restrictions on the photoacid generator, as long as it is a compound that generates acid in response to light. It may be a photoacid generator that generates inorganic acids such as hydrogen halides (e.g., hydrochloric acid), sulfuric acid, and nitric acid, or a photoacid generator that generates organic acids such as carboxylic acids and sulfonic acids. In terms of superior effects of the present invention, it is preferable that the photoacid generator generates inorganic acids, and more preferably that it generates hydrogen halides.

[0078] Specific examples of photoacid generators include triarylsulfonium hexafluorophosphate, triarylsulfonium arsenate, triarylsulfonium antimonate, diaryliodonium hexafluorophosphate, diaryliodonium arsenate, diaryliodonium antimonate, dialkylphenacylsulfonium tetrafluoroborate, dialkylphenacylsulfonium hexafluorophosphate, dialkyl-4-hydroxyphenylsulfonium tetrafluoroborate, dialkyl-4-hydroxyphenylsulfonium hexafluorophosphate, N-bromosuccinimide, tribromomethylphenylsulfone, diphenyliodine, 2-trichloromethyl-5-(p-butoxystyryl)-1,3,4-oxadiazole, and 2,6-ditrichloromethyl-4-(p-methoxyphenyl)-triazine. The photoacid generator may be used alone or in a mixture of two or more types.

[0079] (Light stabilizer) The first photosensitive section preferably contains a light stabilizer. The light stabilizer is not particularly limited as long as it is a material that is stabilized by light, but it is preferable that it acts as a so-called free radical scavenger that traps the free radicals of the activated photoactivator. Light stabilizers may be used individually or in combination of two or more types. Examples of light stabilizers include polyhydric 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-aminephenol. The ratio of light stabilizer to photoactivator (molar ratio of light stabilizer to photoactivator) is preferably 0.0001 to 10, and more preferably 0.0002 to 5.

[0080] (UV absorber) The first photosensitive section may contain an ultraviolet absorber. UV absorbers may be used individually or in combination of two or more types. As ultraviolet absorbers, triazine compounds and benzodithiol compounds are preferred due to their superior sensitivity at a wavelength of 222 nm. Examples of commercially available triazine compounds include Adeka Stab LA-F70 (manufactured by Adeka Corporation), Tinuvin 1577 ED, Tinuvin 1600 (manufactured by BASF), 2,4-Bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 2-(2,4-Dihydroxyphenyl)-4,6-diphenyl-1,3,5-triazine, and Ethylhexyl Triazone (manufactured by Tokyo Chemical Industry Co., Ltd.). Examples of benzodithiol compounds include those described in International Publication No. 2019 / 159570.

[0081] (binder) The first photosensitive section preferably includes a binder. The binder preferably contains either a water-soluble binder or a non-water-soluble binder. Examples of binders include cellulose resins such as methylcellulose, ethylcellulose, carboxymethylcellulose, and hydroxypropylcellulose, polyvinyl alcohol, gum arabic, gelatin, polyvinylpyrrolidone, casein, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, polyvinyl acetate, acrylic resin, polyvinyl chloride, and ethylene-vinyl acetate copolymer. In terms of excellent sensitivity at a wavelength of 222 nm, binders that substantially do not contain aromatic groups are preferred, and cellulose resins and acrylic resins are preferred. Furthermore, as a binder, the polymer binder described in paragraph 0078 of Japanese Patent Publication No. 2017-167155 can be considered, and these details are incorporated herein. The binder may be used individually or in combination of two or more types. The binder may be cross-linked. In other words, the binder may be a cross-linked binder. The crosslinking agent is not particularly limited, and for example, glyxazole can be used. Alternatively, the crosslinking agent described in paragraph 0079 of Japanese Patent Application Publication No. 2017-167155 may also be considered. These details are incorporated herein.

[0082] (Microcapsules) The first photosensitive section preferably contains microcapsules. A microcapsule typically has a core and a capsule wall for enclosing the core material (the substance to be contained within, also referred to as the "encapsulated component") that makes up the core. If the first photosensitive section includes microcapsules, the microcapsules preferably contain a colorant and a solvent as a core material (encapsulated component), more preferably contain a colorant, a photoactivator and a solvent, and even more preferably contain a colorant, a photoactivator, a light stabilizer and a solvent. Examples of the colorant, photoactivator and light stabilizer include the colorant, photoactivator and light stabilizer described above, and the preferred embodiments are similar. The solvent encapsulated in the microcapsules is not particularly limited as long as it is in a liquid state at 25°C, but it is preferable that it contains one or more solvents with a boiling point of 100°C or higher. The upper limit of the boiling point of the solvent is, for example, 500°C or lower. The presence of the solvent within the microcapsules means that the colorant is present in the liquid phase of the solvent, which improves the effect of the photoactivator on the colorant. The solvent contained within the microcapsule may be a single type used alone, or a mixture of two or more types may be used.

[0083] A preferred embodiment of the microcapsule is a microcapsule containing a photo-oxidizing agent as a photoactivator and a color-developing agent that develops color upon oxidation as a color-developing agent. Another preferred embodiment of the microcapsule is a microcapsule containing a photoacid generator as a photoactivator and a colorant that develops color through the action of an acid as a colorant.

[0084] Preferably, the microcapsules are those that, at room temperature, prevent contact between substances inside and outside the capsule due to the substance-separating effect of the capsule wall. Specifically, examples are given in Japanese Patent Publication No. 59-190886 and Japanese Patent Publication No. 60-242094, the contents of which are incorporated herein by reference.

[0085] The capsule walls of microcapsules are preferably composed substantially of resin. "Substantially composed of resin" means that the resin content is 90% by mass or more of the total mass of the capsule wall, and preferably 100% by mass. In other words, the capsule walls of microcapsules are preferably composed of resin. Examples of the above-mentioned resins include polyurethane, polyurea, polyester, polycarbonate, urea-formaldehyde resin, melamine-formaldehyde resin, polystyrene, styrene-methacrylate copolymer, gelatin, polyvinylpyrrolidone, and polyvinyl alcohol. In particular, it is more preferable to use one or more selected from the group consisting of polyurea, polyurethane urea, and polyurethane, as this provides a dense crosslinked structure that prevents leakage of encapsulated material and allows for improved sensitivity at a wavelength of 222 nm by controlling the transmittance at 222 nm.

[0086] Polyurea is a polymer having multiple urea bonds, and is preferably a reaction product formed from raw materials containing polyamine and polyisocyanate. Furthermore, by utilizing the fact that a portion of polyisocyanates reacts with water to form polyamines, it is also possible to synthesize polyureas using polyisocyanates without using polyamines. Furthermore, polyurethane urea is a polymer having urethane bonds and urea bonds, and is preferably a reaction product formed from raw materials containing a polyol, a polyamine, and a polyisocyanate. Furthermore, when polyols and polyisocyanates react, some of the polyisocyanate may react with water to form polyamines, resulting in the acquisition of polyurethane urea. Furthermore, polyurethane is a polymer having multiple urethane bonds, and is preferably a reaction product formed from raw materials containing polyol and polyisocyanate.

[0087] The average particle size of the microcapsules is preferably 0.1 to 100 μm in volume-average particle size. The average particle size (volume-average particle size) of microcapsules can be measured, for example, using a laser analysis / scattering particle size distribution analyzer LA950 (manufactured by Horiba, Ltd.). Furthermore, when measuring the average particle size of macrocapsules contained in the first photosensitive section, the average particle size (volume-average particle size) of microcapsules can be measured using a scanning electron microscope (SEM). Specifically, the surface of the first photosensitive section is observed at 5000x magnification with an SEM, and the average particle size of all microcapsules present in the observed field of view is determined by image analysis. If microcapsules cannot be observed on the surface, a cross-sectional section is prepared and measured in the same manner as described above. The average particle size (volume-average particle size) of microcapsules can be controlled by adjusting the manufacturing conditions of the microcapsules.

[0088] (Other ingredients) In addition to the components described above, the first photosensitive section may contain one or more additives as needed, such as wavelength conversion dyes, fluorescent dyes, surfactants, waxes, reducing agents, sensitizers, crosslinking agents, and odor suppressants.

[0089] For reducing agents, sensitizers, and surfactants, etc., refer to the descriptions in the lower left column of page 9 to the upper left column of page 10 of Japanese Patent Publication No. 1-207741, paragraphs 0072-0075 of International Publication No. 2016 / 017701, and paragraphs 0038-0039 and 0048-0059 of Japanese Patent Publication No. 2004-233614, the contents of which are incorporated herein by reference.

[0090] The type of surfactant is not particularly limited, and known surfactants can be used. In terms of excellent coating surface properties, anionic or nonionic surfactants are preferred, and examples include alkylbenzene sulfonates (e.g., sodium dodecylbenzenesulfonate and ammonium dodecylbenzenesulfonate), alkyl sulfonates (e.g., sodium lauryl sulfate and sodium dioctyl sulfosuccinate), and polyalkylene glycols (e.g., polyoxyethylene nonylphenyl ether).

[0091] The mass per unit area of ​​the first photosensitive section (amount of solid content applied) is not particularly limited, but for example, 0.1 to 30 g / m². 2 Preferably, 0.5 to 25 g / m2 More preferably, 1-10 g / m 2 That is even more preferable. The thickness of the first photosensitive area is preferably 0.1 to 30 μm, more preferably 0.5 to 25 μm, and even more preferably 1 to 10 μm.

[0092] The method for forming the first photosensitive area is not particularly limited and known methods can be used. Examples include applying a photosensitive area-forming composition containing microcapsules encapsulating a color developer onto a support, applying a photosensitive area-forming composition containing a color developer onto a support, and printing a photosensitive area-forming composition containing a color developer onto a support. If the first photosensitive area has a filter, which will be described later, the photosensitive area-forming composition may be applied onto the filter. The support may be changed to a temporary support, and the temporary support may be peeled off after the first photosensitive area is formed. The photosensitive area forming composition may contain other components that may be included in the first photosensitive area described above.

[0093] The method for applying the photosensitive area-forming composition is not particularly limited, and examples of coating machines used during application include air knife coaters, rod coaters, bar coaters, curtain coaters, gravure coaters, extrusion coaters, die coaters, slide bead coaters, and blade coaters. The method for printing the photosensitive composition is not particularly limited and includes screen printing and inkjet printing. After applying the photosensitive area-forming composition, the coating film may be subjected to a drying treatment as needed. Examples of drying treatments include heat treatment.

[0094] <<Other layers>> The first display unit may have layers other than the support and the first photosensitive unit described above. Other layers include, for example, a reflective layer, a glossy layer, a filter, and a sensitivity adjustment layer. For reflective layers, adhesion layers, gloss layers, and sensitivity-adjusting layers, and for methods of manufacturing them, reference can be made to the reflective layers, adhesion layers, gloss layers, and sensitivity-adjusting layers and methods of manufacturing them described in paragraphs 0082 to 0109 of International Publication No. 2016 / 017701. These contents are incorporated herein by reference.

[0095] As the filter, a filter that blocks light with a wavelength greater than 280 nm (hereinafter also referred to as filter Y) is preferred. By blocking light with a wavelength greater than 280 nm, the degradation of the first photosensitive area due to UV-A and UV-B can be suppressed. Filter Y preferably has an average transmittance of 0-30% in the wavelength range of over 280 nm and up to 400 nm, more preferably 0-20%, and even more preferably 0-10%. Filter Y may be colored, but it is preferable that the filter be transparent so that it can be seen through the filter, and that its total light transmittance is preferably 70-100%, more preferably 80-100%, and even more preferably 90-100%. The visible light transmittance of filter Y (average transmittance in the visible light region (400-700 nm)) is preferably 70-100%, more preferably 80-100%, and even more preferably 90-100%. When inspecting the first display unit by irradiating it with light in the wavelength range of 200 to 280 nm through filter Y, it is preferable that filter Y transmits light in the wavelength range of 200 to 280 nm. The average transmittance in the wavelength range of 200 to 280 nm is preferably 70 to 100%, more preferably 80 to 100%, and even more preferably 90 to 100%. Filter Y can be an ultraviolet bandpass filter, a filter containing a dielectric, or a sheet containing an ultraviolet absorber. Any known ultraviolet absorber can be used as the ultraviolet absorber. Furthermore, in terms of blocking light with a wavelength greater than 280 nm, it is preferable to include an ultraviolet absorber that may also be present in the first photosensitive portion. The spectral characteristics of filter Y (for example, various transmittances such as the visible light transmittance mentioned above) can be measured using, for example, a UV-Vis spectrophotometer (UV-2700 / Shimadzu Corporation). Methods for forming filter Y include laminating a sheet that blocks light with a wavelength greater than 280 nm, and applying a filter-forming composition having a compound that blocks light with a wavelength greater than 280 nm to the first photosensitive part.

[0096] <<Second photosensitive section A>> The second photosensitive section A exhibits a visual change before and after exposure to light of at least one wavelength in the range of wavelengths greater than 230 nm and less than or equal to 280 nm (hereinafter also referred to as "specific ultraviolet Y") that has passed through the filter X. The second photosensitive section A may be exposed to multiple wavelengths of light in the range of wavelengths greater than 230 nm and less than or equal to 280 nm, or it may be exposed to all wavelengths of light in the range of wavelengths greater than 230 nm and less than or equal to 280 nm. It is preferable that the second photosensitive section A exhibits a visual change before and after exposure to light with a wavelength of at least 254 nm. As will be described later, since the second photosensitive section A is irradiated with light through the filter X, the second photosensitive section A may be exposed to light of at least one wavelength in the range of 200 to 230 nm.

[0097] The second photosensitive section A, like the first photosensitive section, preferably contains a color developer, and more preferably contains both a color developer and a photoactivator. Examples of colorants that may be included in the second photosensitive section A include colorants that may be included in the first photosensitive section. Examples of photoactivators that may be included in the second photosensitive section A (specifically, photooxidants and photoacid generators) include photoactivators that may be included in the first photosensitive section, except that their photosensitive wavelength is the specific ultraviolet Y described above. More specifically, it is preferable that the photoactivator that may be included in the second photosensitive section A is activated by light of at least one wavelength in the range of wavelengths greater than 230 nm and less than or equal to 280 nm. The photoactivator that may be included in the second photosensitive section A may be activated by light of multiple wavelengths in the range of wavelengths greater than 230 nm and less than or equal to 280 nm, and the photoactivator may be activated by light of all wavelengths in the range of wavelengths greater than 230 nm and less than or equal to 280 nm. It is preferable that the photoactivator that may be included in the second photosensitive section A is activated by light of at least 254 nm. The second photosensitive section A may contain light stabilizers, ultraviolet absorbers, binders, microcapsules, and other components that may also be present in the first photosensitive section. A method for forming the second photosensitive area A is the same as the method for forming the first photosensitive area described above.

[0098] As mentioned above, the first photosensitive part is a component that produces a visual change when exposed to light of at least one wavelength in the range of 200 to 280 nm. However, if the first photosensitive part is also exposed to specific ultraviolet Y and produces a visual change, the first photosensitive part and the second photosensitive part A may be made of the same component. For example, if the first photosensitive part is exposed to light of all wavelengths in the range of 200 to 280 nm, this first photosensitive part is exposed to specific ultraviolet Y and can therefore be used as the second photosensitive part. In other words, if the second photosensitive section A is exposed to specific ultraviolet Y, it may also produce a visual change before and after exposure to light of at least one wavelength in the range of 200 to 230 nm. Therefore, the photoactivator that may be included in the second photosensitive section A may be activated by light of at least one wavelength in the range of 200 to 230 nm, and by light of at least one wavelength in the range of over 230 nm and up to 280 nm. Specifically, the photoactivator that may be included in the second photosensitive section A may be a photoactivator that is activated by light of all wavelengths in the range of 200 to 280 nm.

[0099] <<Filter that blocks light with wavelengths of 200-230nm (Filter X)>> Filter X is a filter that blocks light with wavelengths of 200-230 nm. The average transmittance of filter X at wavelengths of 200-230 nm is preferably 50% or less, more preferably 30% or less, even more preferably 10% or less, and particularly preferably 1% or less. The lower limit of the average transmittance of filter X at wavelengths of 200-230 nm is not particularly limited, but 0% is an example. The filter X preferably blocks light with a wavelength of 222 nm, and the transmittance of the filter X at a wavelength of 222 nm is preferably 10% or less, more preferably 5% or less, and even more preferably 1% or less. The lower limit of the transmittance of the filter X at a wavelength of 222 nm is not particularly limited, but 0% is an example. The filter X preferably blocks light with a wavelength of 230 nm, and its transmittance at 230 nm is preferably 50% or less, more preferably 40% or less, even more preferably 25% or less, and particularly preferably 15% or less. The lower limit of the transmittance of the filter X at 230 nm is not particularly limited, but 0% is an example. Generally, the lower the transmittance at 230 nm, the better the light-blocking performance in the wavelength range of 200 to 230 nm. Filter X is preferable in that, for superior effects of the present invention, the average transmittance at wavelengths of 200 to 230 nm is within the above range, and the transmittance at wavelength 222 nm is within the above range. The filter X is preferably a filter that transmits light with a wavelength of more than 230 nm and 280 nm. Specifically, the average transmittance of the filter X at wavelengths of 230 to 280 nm is preferably 50 to 100%, more preferably 60 to 100%, even more preferably 70 to 100%, particularly preferably 80 to 100%, and most preferably 90 to 100%. The filter X preferably transmits light with a wavelength of 254 nm, and its transmittance at a wavelength of 254 nm is preferably 50% or more, more preferably 70% or more, and even more preferably 75% or more. There is no particular upper limit to the transmittance of the filter X at a wavelength of 254 nm, but 100% is an example. The higher the transmittance at a wavelength of 254 nm, the better the sensitivity. In filter X, in order to satisfy both light shielding properties at wavelengths of 200-230 nm and transmittance properties at wavelengths greater than 230 nm and less than or equal to 280 nm, it is preferable that the difference between the transmittance at wavelength 222 nm and the transmittance at wavelength 254 nm is 50-100%, more preferably 65-100%, and even more preferably 75-100%. In filter X, in terms of superior light shielding at wavelengths of 200-230 nm and transmittance at wavelengths greater than 230 nm and less than or equal to 280 nm, it is preferable that the difference between the transmittance at 230 nm and the transmittance at 254 nm is 40-100%, more preferably 50-100%, and even more preferably 70-100%. Filter X may be colored, but from the viewpoint of visibility, it is preferable that filter X be transparent. The total light transmittance of filter X is preferably 70-100%, more preferably 80-100%, and even more preferably 90-100%. The visible light transmittance of filter X is preferably 70-100%, more preferably 80-100%, and even more preferably 90-100%.

[0100] A preferred embodiment of the filter X is a sheet that absorbs light with a wavelength of 222 nm and transmits light with a wavelength of 254 nm. Specifically, the sheet is preferably one that is substantially free of aromatic groups, and examples include triacetylcellulose (TAC) sheets, polyvinyl chloride (PVC) sheets, (meth)acrylic sheets, polyurethane sheets, and polyurea sheets. In other words, the filter X preferably contains a resin selected from the group consisting of triacetylcellulose, polyvinyl chloride, acrylic resin, methacrylic resin, polyurethane, and polyurea. In this embodiment, "triacetylcellulose (TAC)" refers to a cellulose acylate in which the hydrogen atoms constituting the hydroxyl groups of cellulose, i.e., the free hydroxyl groups at positions 2, 3, and 6 of the β-1,4-linked glucose units, are substituted with acetyl groups, and the degree of acetyl group substitution is 2.3 or higher. A degree of acetyl group substitution of 2.7 or higher is preferred. Here, "degree of substitution" refers to the degree to which an acetyl group substitutes for a hydrogen atom constituting a hydroxyl group in cellulose. 13 This can be calculated by comparing the area intensity ratio of carbon atoms in cellulose acylate measured by 13C-NMR. An example of a TAC sheet is the Fujitac Z-TAC (manufactured by Fujifilm Corporation).

[0101] Another preferred embodiment of filter X includes a compound that blocks light with a wavelength of 200 to 230 nm (hereinafter also referred to as compound X). Compound X is preferably a compound that absorbs light with a wavelength of 222 nm and transmits light with a wavelength of 254 nm. Compound X may be a low-molecular-weight compound, a high-molecular-weight compound, or a crosslinked compound. Compound X is a compound having a carbonyl bond, and it is preferable that it has one substructure selected from the group consisting of an ester bond, a urethane bond, and a urea bond. Specifically, examples include cellulose derivatives such as triacetylcellulose (TAC) resin, acetylcellulose, alkylcellulose, carboxymethylcellulose, and hydroxyalkylcellulose, polyvinyl alcohol derivatives such as polyvinyl acetate, polyvinyl butyral, and polyvinylpyrrolidone, (meth)acrylic resin, urethane resin, and urea resin. Examples of urethane resin and urea resin include resins obtained by reacting xylene diisocyanate. The content of compound X in filter X is preferably 50 to 100% by mass, and more preferably 80 to 100% by mass, based on the total mass of filter X. As compound X, known ultraviolet absorbers are also preferred. Examples of ultraviolet absorbers include triazine compounds, benzotriazole compounds, benzophenone compounds, and benzodithiol compounds. Among these, triazine compounds and benzodithiol compounds are preferred as compound X. Specific examples of triazine compounds and benzodithiol compounds are the same as those that may be present in the first photosensitive section.

[0102] The spectral characteristics of filter X (for example, various transmittances such as the visible light transmittance mentioned above) can be measured using, for example, an ultraviolet-visible spectrophotometer (UV-2700 / Shimadzu Corporation).

[0103] The thickness of filter X is appropriately selected considering the transmittance at wavelengths of 222 nm and 254 nm, preferably 500 nm or more, more preferably 1 μm or more, and even more preferably 2 μm or more. If the transmittance at wavelength 254 nm is sufficient, the thicker the filter X, the more it can block light at wavelength 222 nm. On the other hand, if the transmittance at wavelength 254 nm is low, the thinner the filter X, the more it can transmit light at wavelength 254 nm. There is no particular upper limit to the thickness of filter X, but it is preferably 2 cm or less, more preferably 1000 μm or less, even more preferably 500 μm or less, and especially preferably 200 μm or less in terms of light blocking at wavelength 222 nm and transmittance at wavelength 254 nm.

[0104] Methods for forming the second display unit, which includes the second photosensitive unit A and the filter X, include a method of laminating a sheet that blocks light with a wavelength of 200 to 230 nm to the second photosensitive unit A, a method of forming a filter by applying a filter-forming composition containing compound X to the second photosensitive unit A, and a method of applying a composition for forming the second photosensitive unit A to a sheet that blocks light with a wavelength of 200 to 230 nm.

[0105] [Second Embodiment] A second embodiment of the inspection tool of the present invention has a first display unit having a first photosensitive unit that produces a visual change before and after exposure to light of at least one wavelength in the range of 200 to 280 nm, and a second display unit having a second photosensitive unit B that does not produce a visual change before and after exposure to light of at least one wavelength in the range of over 230 nm and up to 280 nm, but does not produce a visual change before and after exposure to light in the range of over 230 nm and up to 280 nm. A specific embodiment of the second embodiment described above is shown in Figure 11. Figure 11 is a schematic cross-sectional view showing an example of the second embodiment of the inspection tool. The inspection tool 40 shown in Figure 11 has a support 12, a first photosensitive part 42, and a second photosensitive part B44.

[0106] <<First photosensitive section>> The first photosensitive section in the second embodiment has the same configuration as the first photosensitive section in the first embodiment, and the preferred embodiment is also the same.

[0107] <<Second photosensitive section B>> The second photosensitive section B is not sensitive to light in the wavelength range of 200 to 230 nm, but exhibits a visual change before and after exposure to light of at least one wavelength in the range of over 230 nm and up to 280 nm. The second photosensitive section B is designed to be unsensitive to light in the wavelength range of 200 to 230 nm. Therefore, it is preferable that the second photosensitive section B contains a compound (compound X) that blocks light in the wavelength range of 200 to 230 nm, and also contains a color developer and a photoactivator that is activated by at least specific ultraviolet Y, similar to the second photosensitive section A described above. The photoactivator contained in the second photosensitive section B may be sensitive to light of at least one wavelength in the wavelength range of 200 to 230 nm, similar to the photoactivator that may be contained in the second photosensitive section A described above. In other words, the materials that may be contained in the second photosensitive section B are the same as the materials that may be contained in the second photosensitive section A, except for compound X, so the explanation of materials other than compound X will be omitted below. Furthermore, in order to create a photosensitive area that is not sensitive to light in the wavelength range of 200 to 230 nm, it is also preferable to select the colorant and photoactivator according to the wavelength.

[0108] (A compound (compound X) that blocks light with a wavelength of 200-230 nm) Compound X is the same as compound X that may be present in the filter X in the first embodiment, and the preferred embodiment is also the same. In addition to existing as a binder or additive, compound X in the second photosensitive section B may also preferably exist as the capsule wall of a microcapsule. The microcapsules that the second photosensitive section B may have have the same configuration as the microcapsules that the first photosensitive section may have in the first embodiment, and the preferred embodiments are also the same. In other words, it is preferable that the second photosensitive section B contains a microcapsule with compound X as the capsule wall and a core material containing a colorant and a solvent. The microcapsules in the second photosensitive section B are preferably microcapsules in which a reaction product of xylene diisocyanate forms the capsule wall and a colorant or the like is encapsulated inside. When compound X is used as the capsule wall, the thickness of the capsule wall (number-average wall thickness) of the microcapsule is preferably 0.2 to 5 μm, and more preferably 0.3 to 2 μm, from the viewpoint of light shielding. The thickness of a microcapsule refers to the thickness of the capsule wall that forms the capsule particle of the microcapsule. The number-average wall thickness is the average value obtained by measuring the thickness of the individual capsule walls of 10 microcapsules using a scanning electron microscope (SEM). More specifically, a cross-sectional section of the second photosensitive section B containing the microcapsules is prepared, and the cross-section is observed at 1000x magnification using an SEM. Five microcapsules are selected in descending order of average particle size (volume-average particle size), and the cross-section of each selected microcapsule is observed at 15000x magnification to determine the thickness of the capsule wall and calculate the average value.

[0109] Methods for forming the second photosensitive area B include applying a composition containing compound X and a colorant to a support, applying a composition containing a compound X precursor having an isocyanate group and a colorant to a support and reacting the isocyanate by heating to form a film, and applying a composition containing microcapsules encapsulating compound X and a colorant to a support.

[0110] [Third Embodiment] A third embodiment of the inspection device of the present invention includes a first light-receiving unit that receives light of at least one wavelength in the range of 200 to 280 nm, a first display unit that produces a visual change according to the amount of light received by the first light-receiving unit, a filter X, a second light-receiving unit that receives light of at least one wavelength in the range of over 230 nm and up to 280 nm, and a second display unit that produces a visual change according to the amount of light received by the second light-receiving unit. The filter X is provided on the light-receiving surface side of the second light-receiving unit. When, for example, light with a wavelength of 222 nm is irradiated onto the inspection device of the third embodiment described above, the irradiated light is received by the first light receiving unit, and a visual change occurs on the first display unit according to the amount of light received. On the other hand, since a filter X is placed on the light receiving surface side of the second light receiving unit, when light with a wavelength of 222 nm is irradiated toward the second light receiving unit, the light with a wavelength of 222 nm is absorbed by the filter X, the light with a wavelength of 222 nm is not received by the second light receiving unit, and no visual change occurs on the second display unit. From the above results, if the light irradiated onto the inspection device of the third embodiment includes light with a wavelength of 222 nm that can contribute to the inactivation of viruses, etc., and does not include light with a wavelength between 230 nm and 280 nm that is harmful to the human body, then a visual change will occur only on the first display unit, and it can be inspected that the irradiated light includes light with a wavelength that can contribute to the inactivation of viruses, etc. (in this case, light with a wavelength of 222 nm) and does not include light that is harmful to the human body.

[0111] The first light-receiving section and the second light-receiving section may be the same or different. The first display unit and the second display unit may be the same or different.

[0112] In the third embodiment described above, the first and second display units are not particularly limited in type as long as they produce a visual change, but for example, they may be composed of a light source array, and it is preferable that they be composed of an LED array. A light source array is an array of multiple light sources arranged at a predetermined distance, and more specifically, an array of multiple LED light sources arranged at a predetermined distance is preferred. When the first and second display units are composed of such LED arrays, a visual change is produced by changing the number of LED light sources in the LED array that are lit according to the amount of light received by the first and second light receiving units. The relationship between the number of LED light sources to be lit and the amount of light received is determined based on a predetermined relationship. Furthermore, the first and second display units may be configured in ways other than the light source array described above, for example, they may be composed of a display. The display can display characters and numbers according to the amount of light received. The relationship between the amount of light received and the characters to be displayed is determined based on a predetermined relationship.

[0113] In the third embodiment described above, the first light-receiving unit receives light of at least one wavelength in the range of 200 to 280 nm. Preferably, the first light-receiving unit receives light of at least 222 nm. The first light-receiving unit may receive light of multiple wavelengths in the range of 200 to 280 nm, or it may receive light of all wavelengths in the range of 200 to 280 nm. In the third embodiment described above, the second light-receiving unit receives light of at least one wavelength in the range of wavelengths greater than 230 nm and less than or equal to 280 nm. Preferably, the second light-receiving unit receives light of at least 254 nm wavelength. The second light-receiving unit may receive light of multiple wavelengths in the range of wavelengths greater than 230 nm and less than or equal to 280 nm, or it may receive light of all wavelengths in the range of wavelengths greater than 230 nm and less than or equal to 280 nm. Furthermore, since the second light-receiving unit is irradiated with light through the filter X, the second light-receiving unit may receive light of at least one wavelength in the range of 200 to 230 nm. The specific configurations of the first and second light-receiving units are not particularly limited; for example, a photodiode can be used to detect the amount of light received.

[0114] In the inspection device of the third embodiment, a control unit may be further included, which causes a visual change in the first display unit in accordance with the amount of light received by the first light receiving unit. The control unit may also cause a visual change in the second display unit in accordance with the amount of light received by the second light receiving unit.

[0115] In the inspection tool of the present invention, the first display unit and the second display unit may be structurally connected or may be composed of separate components. For example, as described in the first embodiment above, when a portion of a photosensitive sheet that is sensitive to light of all wavelengths in the range of 200 to 280 nm and produces a visual change is used as the first photosensitive unit and the other portion as the second photosensitive unit A, the first display unit and the second display unit are structurally connected. Also, for example, in the third embodiment above, the tool may include a first unit that includes a first light receiving unit and a first display unit, and a second unit that includes a second light receiving unit and a second display unit and is not structurally connected to the first unit.

[0116] [Test kit] The test kit includes at least the testing equipment described above. The specific configuration of the test kit is not particularly limited, and examples include a test tool and other elements selected from the group consisting of a light-shielding filter (for example, a filter that blocks indoor light such as fluorescent lamps or LEDs, and sunlight), a light-shielding bag (a bag that blocks indoor light and sunlight), a judgment sample, a limit sample (calibration sheet), and a focusing jig such as a lens and a concave mirror. The light-shielding filter is preferably the same as the filter Y described above.

[0117] The present invention also relates to an inspection method using the inspection tool of the present invention. In the inspection method of the present invention, by using the inspection tool described above, it is possible to perform an inspection to determine whether light that inactivates viruses, etc., has been irradiated, and an inspection to determine whether light harmful to the human body has been irradiated. [Examples]

[0118] The features of the present invention will be further described below with reference to examples and comparative examples. The materials, amounts used, proportions, processing content, and processing procedures shown in the following examples can be modified as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be interpreted restrictively by the specific examples shown below.

[0119] [Example 1] After adding mixture 1 with the following composition to a 5% by mass aqueous solution of polyvinyl alcohol (202 parts by mass), it was emulsified and dispersed at 20°C to obtain an emulsion with a volume average particle size of 1 μm. Further, the obtained emulsion was continuously stirred at 50°C for 4 hours. Further, water was added to adjust the concentration, and a color former-containing microcapsule liquid with a solid content concentration of 15.9% by mass was obtained.

[0120] <Composition of mixture 1> Color former: 3,3-bis(2-methyl-1-octyl-3-indolyl)phthalide (manufactured by BASF) 0.7 parts by mass Organic halogen compound: tribromomethylphenyl sulfone (manufactured by Sumitomo Seika Co., Ltd.) 10 parts by mass Solvent: tricresyl phosphate (manufactured by Daihachi Chemical Industry Co., Ltd.) 23 parts by mass Solvent for capsule production: ethyl acetate (manufactured by Showa Denko K.K.) 50 parts by mass Light stabilizer: 2,5-bis(1,1,3,3-tetramethylbutyl)hydroquinone (manufactured by Tokyo Chemical Industry Co., Ltd.) 0.03 parts by mass Capsule wall-forming material: an adduct of xylene diisocyanate and trimethylolpropane (trade name "Takenate D-110N", manufactured by Mitsui Chemicals, Inc., 75 wt% ethyl acetate solution) 31 parts by mass

[0121] The obtained microcapsule dispersion (20 parts by mass), a 6% by mass aqueous solution of polyvinyl alcohol (trade name "Denka Size EP-130", manufactured by Denka Co., Ltd.) (5 parts by mass), glyoxal (manufactured by Daito Chemical Co., Ltd.) 0.05 parts by mass, and a 50% by mass aqueous solution of sodium dodecylbenzenesulfonate (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 0.09 parts by mass were mixed to prepare a composition for forming a photosensitive part.

[0122] The obtained composition for forming a photosensitive part was applied to a white polyethylene terephthalate sheet with a thickness of 188 μm (trade name "Crisper K1212", manufactured by Toyobo Co., Ltd.) at a solid content coating amount of 3 g / m 2A sheet 1A comprising a support and a photosensitive area was fabricated by coating and heat-drying in the manner described. The film thickness of the photosensitive area was approximately 3 μm. The photosensitive area exhibits a visual change before and after exposure to light with a wavelength of at least 200 to 280 nm. The photosensitive portion in sheet 1A corresponds to the first photosensitive portion of the first embodiment of the inspection device described above.

[0123] Sheet 1A was prepared separately as described above, and a TAC sheet (Fujitac Z-TAC, manufactured by Fujifilm Corporation, 60 μm thick, transmittance at 222 nm is 0.1%, transmittance at 230 nm is 3.2%, transmittance at 254 nm is 79.9%, average transmittance at 200-230 nm is 0.3%, average transmittance at 230-280 nm is 66.0%, and visible light transmittance is 92%) was laminated onto the side of the obtained sheet 1A opposite to the support of the photosensitive area to produce sheet 1B. The TAC sheet in sheet 1B corresponds to the filter X of the first embodiment of the inspection device described above, and the photosensitive part in sheet 1B corresponds to the second photosensitive part A of the first embodiment of the inspection device described above. Sheet 1A and Sheet 1B were set in a single white resin holding jig to create the inspection device 1. The holding jig had two openings, and was set so that light would hit the first photosensitive area in Sheet 1A and the second photosensitive area A in Sheet 1B. That is, Sheet 1A and Sheet 1B were set in the holding jig so that the side opposite to the support was the light-receiving surface. The inspection device 1 corresponds to the first embodiment, and the first photosensitive area and the second photosensitive area A contain microcapsules. In Example 1, sheet 1A and sheet 1B were placed in a single holding jig, but they may also be used as separate sheets.

[0124] [Example 2] Except for changing mixture 1 to mixture 2, sheet 2B was prepared in the same manner as in Example 1, but instead of sheet 1B. Sheet 1A and Sheet 2B, prepared in Example 1, were set in a single holding jig, and an inspection tool 2 was prepared and evaluated in the same manner as in Example 1. Inspection tool 2 corresponds to the first embodiment, and the first and second photosensitive parts have microcapsules. The second photosensitive area in sheet 2B produces a visual change before and after exposure to light with a wavelength of at least 240 to 280 nm.

[0125] <Composition of Mixture 2> Colorant: Leucocrystal violet (product name "LCV", manufactured by Yamada Chemical Industry Co., Ltd.) 2.6 parts by mass Organic halogen compound: Tribromomethylphenylsulfone (manufactured by Sumitomo Seika Co., Ltd.) 1.3 parts by mass Radical generator: Lophenidimer (2,2'-bis(2-chlorophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole, trade name "B-IMD", manufactured by Kurogane Kasei Co., Ltd.) 2.5 parts by mass Solvent: Tricresyl phosphate (manufactured by Daihachi Chemical Industry Co., Ltd.) 23 parts by mass Solvent: SAS-296 (phenylxylethane, trade name "Nisseki Hyzole SAS296", manufactured by JX Nippon Oil & Energy Corporation) 8 parts by mass Solvent for capsule preparation: Ethyl acetate (manufactured by Showa Denko K.K.) 50 parts by mass Light stabilizer: 2,5-bis(1,1,3,3-tetramethylbutyl)hydroquinone (manufactured by Tokyo Chemical Industry Co., Ltd.) 0.3 parts by mass Capsule wall forming material: Adduct of xylene diisocyanate and trimethylolpropane (product name "Takenate D-110N", manufactured by Mitsui Chemicals, Inc., 75% by weight ethyl acetate solution) 31 parts by mass

[0126] [Example 3] Mixture 3 with the following composition was applied to a 188 μm thick white polyethylene terephthalate sheet (product name "Crisper K1212", manufactured by Toyobo Co., Ltd.) at a solid content rate of 10 g / m². 2 The material was coated and dried to create a sheet 3A comprising a support and a photosensitive area. The film thickness of the photosensitive area was approximately 10 μm. The photosensitive portion in sheet 3A corresponds to the first photosensitive portion of the first embodiment of the inspection device described above. The photosensitive portion in sheet 3A produces a visual change before and after exposure to light with a wavelength of at least 200 to 280 nm.

[0127] <Composition of Mixture 3> Colorant: 3,3-bis(2-methyl-1-octyl-3-indolyl)phthalide (BASF) 0.65 parts by mass Organic halogen compound: Tribromomethylphenylsulfone (manufactured by Sumitomo Seika Co., Ltd.) 0.6 parts by mass Binder: Acrylic acid / ethyl acrylate / ethyl methacrylate copolymer 13 parts by mass Light stabilizer: 2,5-bis(1,1,3,3-tetramethylbutyl)hydroquinone (manufactured by Tokyo Chemical Industry Co., Ltd.) 0.03 parts by mass Solvent: Tricresyl phosphate (manufactured by Daihachi Chemical Industry Co., Ltd.) 1 part by mass Solvent: Methyl ethyl ketone (manufactured by Sankyo Chemical Co., Ltd.) 26 parts by mass

[0128] Sheet 3A was prepared separately as described above, and a TAC sheet (Fujitac Z-TAC, 60 μm thick, manufactured by Fujifilm Corporation) was laminated onto the side of the obtained sheet 3A opposite to the support of the photosensitive area to produce sheet 3B. The TAC sheet in sheet 3B corresponds to the filter X of the first embodiment of the inspection device described above, and the photosensitive part in sheet 3B corresponds to the second photosensitive part A of the first embodiment of the inspection device described above. Sheet 3A and Sheet 3B were set in a single holding jig, and inspection tool 3 was fabricated and evaluated in the same manner as in Example 1. Note that inspection tool 3 corresponds to the first embodiment, and the first and second photosensitive parts do not contain microcapsules.

[0129] [Example 4] Sheet 4 was prepared in the same manner as Sheet 1A in Example 1, except that the support material was changed to a 60 μm thick TAC sheet (Fujitac Z-TAC, 60 μm thick, manufactured by Fujifilm Corporation). Sheet 4 was set in a white resin holding jig so that the side coated with the photosensitive area became the light-receiving surface. This sheet was designated as Sheet 4A. The photosensitive portion in sheet 4A corresponds to the first photosensitive portion of the first embodiment of the inspection device described above. Furthermore, the TAC sheet surface of sheet 4 was similarly set into a white resin holding jig so that it would become the light-receiving surface. This sheet is designated as sheet 4B. The TAC sheet positioned on the light-receiving surface side of sheet 4B corresponds to the filter X of the first embodiment of the inspection device described above, and the photosensitive portion of sheet 4B corresponds to the second photosensitive portion A of the first embodiment of the inspection device described above. A sample containing sheet 4A and sheet 4B was designated as test tool 4 and evaluated in the same manner as in Example 1. Test tool 4 corresponds to the first embodiment, and the first and second photosensitive parts have microcapsules.

[0130] [Example 5] 25 parts by mass of ethyl acetate and 10 parts by mass of Takenate D-110N (an adduct of xylene diisocyanate and trimethylolpropane, manufactured by Mitsui Chemicals, Inc., 75% by weight ethyl acetate solution) were mixed and spin-coated onto a silicon wafer at 1500 rpm for 15 seconds. The resulting coating was immersed in 85°C hot water for 3 hours to crosslink. After being removed from the hot water and dried, the coating was peeled off the silicon wafer to obtain filter sheet X5. The obtained filter sheet X5 had a thickness of approximately 1 μm, with a transmittance of 0.2% at a wavelength of 222 nm, 18.9% at a wavelength of 230 nm, and 70.3% at a wavelength of 254 nm. Furthermore, the average transmittance of filter sheet X5 at wavelengths of 200-230 nm was 16%, the average transmittance at wavelengths of 230-280 nm was 71%, and the visible light transmittance was 93%. Sheet 5B was fabricated by laminating a filter sheet X5 onto the side of sheet 1A, which was prepared in Example 1, that was opposite to the support for the photosensitive area. The filter sheet X in sheet 5B corresponds to the filter X of the first embodiment of the inspection device described above, and the photosensitive part in sheet 5B corresponds to the second photosensitive part A of the first embodiment of the inspection device described above. The sheet 1A prepared in Example 1 and the sheet 5B described above were set in a single holding jig, and the inspection tool 5 was prepared and evaluated in the same manner as in Example 1. The inspection tool 5 corresponds to the first embodiment, and the first and second photosensitive parts have microcapsules.

[0131] [Example 6] We prepared two commercially available indicators that light up according to the illuminance in the wavelength range of 220-280 nm. The indicator is equipped with a light-receiving unit and a display unit, as described in the third embodiment above. One of the two indicators was designated as Indicator A, and a TAC sheet (Fujitac Z-TAC, 60 μm thick, manufactured by Fujifilm Corporation) was attached to the light-receiving part of the other indicator, making it Indicator B. Indicator A has a first light receiving unit and a first display unit as described in the third embodiment described above, and indicator B has a filter X, a second light receiving unit and a second display unit as described in the third embodiment described above. Indicator A and Indicator B were combined to form Inspection Tool 6, which was evaluated in the same manner as in Example 1. Inspection Tool 6 corresponds to the third embodiment.

[0132] [Example 7] Mixture 4 with the following composition was added to a 5% by mass aqueous solution of polyvinyl alcohol (202 parts by mass), and then emulsified and dispersed at 20°C to obtain an emulsion with a volume-average particle size of 0.1 μm. The obtained emulsion was continuously stirred at 50°C for 4 hours. Furthermore, water was added to adjust the concentration to obtain a polyurethane urea particle dispersion with a solid content of 10% by mass. <Composition of Mixture 4> Solvent: Ethyl acetate (manufactured by Showa Denko K.K.) 20 parts by mass Fine particle forming material: Adduct of xylene diisocyanate and trimethylolpropane (product name "Takenate D-110N", manufactured by Mitsui Chemicals, Inc., 75% by weight ethyl acetate solution) 50 parts by mass

[0133] A composition for forming a filter layer was prepared by mixing the obtained polyurethane urea particle dispersion (33 parts by mass), a 6% by mass aqueous solution of polyvinyl alcohol (product name "Denka Size EP-130", manufactured by Denka Co., Ltd.) (22 parts by mass), glyoxal (manufactured by Daito Chemical Co., Ltd.), and a 50% by mass aqueous solution of sodium dodecylbenzenesulfonate (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.). The obtained filter layer-forming composition was applied to the side of sheet 1A opposite to the support at a solid content rate of 2 g / m². 2 The sheet 7B, comprising a support and a photosensitive area, was fabricated by coating and heat-drying in the manner described. The surface layer of sheet 7B was scraped off from the side opposite the support, leaving a top layer of 1 μm, and the transmittance was measured. The transmittance was found to be almost the same as that of filter sheet X5 obtained in Example 5. Sheet 1A and Sheet 7B were set in a single holding jig, and the inspection device 7 was fabricated and evaluated in the same manner as in Example 1. Sheet 7B was set in the holding jig so that the side opposite to the support became the light-receiving surface.

[0134] [Example 8] Sheet 8B was fabricated by laminating the TAC sheets to be used (Fujitac Z-TAC, manufactured by Fujifilm Corporation, 130 μm, transmittance at wavelength 222 nm is 0.0%, transmittance at wavelength 230 nm is 0.06%, transmittance at wavelength 254 nm is 69.7%, average transmittance at wavelengths 200-230 nm is 0.0%, average transmittance at wavelengths 230-280 nm is 54.0%, and visible light transmittance is 92%). Sheet 1A and Sheet 8B were set in a single holding jig, and an inspection tool 7 was fabricated and evaluated in the same manner as in Example 1.

[0135] [Example 9] Mixture 1 with the following composition was added to a 5% by mass aqueous solution of polyvinyl alcohol (202 parts by mass), and then emulsified and dispersed at 20°C to obtain an emulsion with a volume-average particle size of 10 μm. Furthermore, the obtained emulsion was continuously stirred at 50°C for 4 hours. Further, water was added to adjust the concentration to obtain a microcapsule solution containing a colorant with a solid content concentration of 15.9% by mass.

[0136] <Composition of Mixture 5> Colorant: Leucocrystal violet (product name "LCV", manufactured by Yamada Chemical Industry Co., Ltd.) 2.6 parts by mass Organic halogen compound: Tribromomethylphenylsulfone (manufactured by Sumitomo Seika Co., Ltd.) 1.3 parts by mass Radical generator: Lophenidimer (2,2'-bis(2-chlorophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole, trade name "B-IMD", manufactured by Kurogane Kasei Co., Ltd.) 2.5 parts by mass Solvent: Tricresyl phosphate (manufactured by Daihachi Chemical Industry Co., Ltd.) 23 parts by mass Solvent: SAS-296 (phenylxylethane, trade name "Nisseki Hyzole SAS296", manufactured by JX Nippon Oil & Energy Corporation) 8 parts by mass Solvent for capsule preparation: Ethyl acetate (manufactured by Showa Denko K.K.) 50 parts by mass Light stabilizer: 2,5-bis(1,1,3,3-tetramethylbutyl)hydroquinone (manufactured by Tokyo Chemical Industry Co., Ltd.) 0.3 parts by mass Capsule wall forming material: Adduct of xylene diisocyanate and trimethylolpropane (product name "Takenate D-110N", manufactured by Mitsui Chemicals, Inc., 75% by weight ethyl acetate solution) 50 parts by mass

[0137] A photosensitive area-forming composition was prepared by mixing the obtained microcapsule dispersion (20 parts by mass), a 6% by mass aqueous solution of polyvinyl alcohol (product name "Denka Size EP-130", manufactured by Denka Co., Ltd.) (5 parts by mass), glyoxal (manufactured by Daito Chemical Co., Ltd.), and a 50% by mass aqueous solution of sodium dodecylbenzenesulfonate (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.). The resulting photosensitive area-forming composition was applied to a 188 μm thick white polyethylene terephthalate sheet (product name "CRISPER K1212", manufactured by Toyobo Co., Ltd.) with a solid content coating amount of 10 g / m². 2 The material was applied and heated to create a sheet 9B comprising a support and a photosensitive area. The film thickness of the photosensitive area was approximately 10 μm, and the thickness of the capsule wall was approximately 0.5 μm. Sheet 1A and Sheet 9B were set in a single holding jig, and an inspection tool 7 was fabricated and evaluated in the same manner as in Example 1.

[0138] [Example 10] 0.8 g of 7-(diethylamino)coumarin-3-carboxylic acid (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) and 1 kg of dried acrylic resin pellets were placed in a container, dispersed using a shaker, and then mixed using an extruder to produce pellets. Sheet 10A was then produced by forming it into a sheet using a heat press. Sheet 2B was also produced in the same manner as in Example 2. The obtained sheet 10A and sheet 2B were set in a single holding jig, and the inspection tool 10 was fabricated and evaluated in the same manner as in Example 1.

[0139] [Evaluation of irradiation at a wavelength of 222nm] Test devices 1-10 were evaluated by irradiating them with light at a wavelength of 222 nm. Specifically, Care222 (registered trademark) (manufactured by Ushio Inc.) was placed 20 cm away from test devices 1-10, and the irradiation dose of 222 nm light was 1 mJ / cm². 2 Light was shone onto test devices 1-10 until the desired result was reached, and the visual changes before and after irradiation (color changes for test devices 1-5 and 7-10, and lamp illumination for test device 6) were observed visually. Note that in Examples 6 and 10, visual changes were observed only while the light was being shone, while in Examples 1-5 and 7-9, visual changes remained even after the light had been shone. The results are shown in Table 1.

[0140] [Evaluation of irradiation at a wavelength of 254nm] Test devices 1-10 were evaluated by irradiating them with light at a wavelength of 254 nm. Specifically, a handy UV lamp SLUV-8 (manufactured by AS ONE Corporation) was placed 20 cm away from test devices 1-10, and the irradiation dose of 254 nm light was 3 mJ / cm². 2 Light was shone onto test devices 1-10 until the desired result was reached, and the visual changes before and after irradiation (color changes for test devices 1-5 and 7-10, and lamp illumination for test device 6) were observed visually. Note that in Examples 6 and 10, visual changes were observed only while the light was being shone, while in Examples 1-5 and 7-9, visual changes remained even after the light had been shone. The results are shown in Table 1.

[0141] In Table 1, "White → Magenta" indicates a change from white to magenta in visual evaluation before and after irradiation, and "White → Purple" indicates a change from white to purple in visual evaluation before and after irradiation.

[0142] [Table 1]

[0143] Since the testing devices manufactured in each embodiment include a first display unit and a second display unit, it was easy to determine, by visual change, whether light that inactivates viruses, etc., was irradiated, and whether light harmful to the human body was irradiated. More specifically, for example, when the inspection tool 1 of Example 1 is irradiated with light that includes light with a wavelength of 222 nm but does not include light with wavelengths of 230 to 280 nm, a visual change from white to magenta occurs in the first display unit, but there is no visual change in the second display unit. Therefore, it can be confirmed that light that inactivates viruses and the like is being irradiated, and that light harmful to the human body is not being irradiated. On the other hand, irradiation evaluations similar to those in the examples were performed using commercially available UV scales (L type, manufactured by Fujifilm Corporation) and UV labels (S type, manufactured by NOF Corporation), but it was not possible to simultaneously determine whether light that inactivates viruses, etc., was irradiated and whether light harmful to the human body was irradiated.

Description of Symbols

[0144] Inspection tools 10, 30, 40 Support 12 Photosensitive part 14 Filter 16 First display part 18 Second display part 20 Holding substrate 22 First photosensitive part 42 Second photosensitive part B 44

Claims

1. An inspection device including a first display section and a second display section, The first display unit is a display unit that produces a visual change before and after irradiating the inspection device with light of at least one wavelength in the range of 200 to 280 nm. The first display unit includes a first photosensitive unit that produces a visual change before and after receiving light of at least one wavelength in the range of 200 to 280 nm, The second display unit is a display unit that shows no visual change before and after irradiating the inspection device with light of a wavelength in the range of 200 to 230 nm, and shows a visual change before and after irradiating the inspection device with light of at least one wavelength in the range of over 230 nm and up to 280 nm. The second display unit includes a filter X that blocks light in the wavelength range of 200 to 230 nm, and a second photosensitive unit that produces a visual change before and after receiving light of at least one wavelength in the range of wavelengths greater than 230 nm and less than or equal to 280 nm that has passed through the filter X. An inspection device in which the second photosensitive area is a region covered by the filter X of a photosensitive sheet that is sensitive to light of all wavelengths in the range of 200 to 280 nm and produces a visual change, and the first photosensitive area is a region of the photosensitive sheet that is not covered by the filter X.

2. The inspection device according to claim 1, wherein the aforementioned visual change is selected from the group consisting of a change in color, a change in pattern, and a combination thereof.

3. The inspection device according to claim 1, wherein the second photosensitive part contains a color-developing agent.

4. The transmittance of the aforementioned filter X at a wavelength of 222 nm is 5% or less. The inspection device according to any one of claims 1 to 3, wherein the transmittance of the filter X at a wavelength of 254 nm is 50% or more.

5. The average transmittance of the filter X at wavelengths of 200 to 230 nm is 1% or less. The inspection device according to any one of claims 1 to 4, wherein the average transmittance of the filter X at wavelengths of 230 to 280 nm is 50% or more.

6. The inspection device according to any one of claims 1 to 5, wherein the filter X comprises a resin selected from the group consisting of triacetylcellulose, polyvinyl chloride, acrylic resin, methacrylic resin, polyurethane, and polyurea.

7. An inspection method using the inspection tool described in any one of claims 1 to 6.

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