Disinfectant visualization sheet

Abstract

To provide a disinfectant visualization sheet that enables long-term storage, allows for easy visual checking of disinfectant application, and facilitates repeated use, and to provide disinfectant visualization particles.SOLUTION: A disinfectant visualization sheet includes: a substrate; and a coloring section that is disposed above the substrate. The coloring section includes a visualizing agent that shows a change in its coloring state upon application of a disinfectant. A coating section includes a silsesquioxane structure.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a disinfectant visualization sheet. [Background technology]

[0002] In recent years, the risk of infectious diseases has increased, and cities have been locked down in consideration of the medical system. In daily life, there are more and more cases where face-to-face conversations are not possible, and in highly public spaces such as coworking spaces, the occupancy rate has decreased, the productivity of users of the facility has decreased, and business opportunities have been lost. There are concerns that this will ultimately lead to a decline in the economy.

[0003] Therefore, the actions of cleaning and sterilization are considered important, and a technology for visualizing the actions has been disclosed. In Patent Document 1, the sterilization operation during cleaning is visualized using a fluorescent material in the ultraviolet range. However, this technology requires special tools and is therefore not convenient.

[0004] For example, Patent Document 2 discloses a technology in which the color of a pH-responsive dye changes when the disinfectant reacts with the dye. However, this method requires mixing two reactive substances into one liquid, making it difficult to store for a long time. Patent Document 3 discloses a technology in which a detection species is contained in an aerogel to cause it to develop color, but this technology lacks durability for repeated use.

[0005] In addition, Patent Documents 1 and 2 disclose materials that can visualize the application of a disinfectant, but do not disclose how to record or manage the application status of the disinfectant when there are many disinfection targets. When there are many disinfection targets, if a person records the application of the disinfectant by hand or by inputting it into a computer, it is time-consuming and there is a possibility that the application status will be recorded incorrectly. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] U.S. Patent No. 8,519,360 [Patent Document 2] US Patent Application Publication No. 2017 / 0336373 [Patent Document 3] JP 2020-101535 A Summary of the Invention [Problem to be solved by the invention]

[0007] Therefore, an object of the present invention is to provide a disinfectant-visualizing sheet and disinfectant-visualizing particles that can be stored for a long period of time, allow the application of a disinfectant to be easily confirmed visually, and can be used repeatedly.

[0008] Another object of the present invention is to provide an information acquisition system that can correctly and easily acquire information regarding the application of a disinfectant. [Means for solving the problem]

[0009] The disinfectant visualization sheet according to the present invention has a substrate, a color portion provided on the substrate, and a covering portion on the color portion, the color portion having a visualization agent whose color state changes when a disinfectant is applied thereto, and the covering portion has a silsesquioxane structure.

[0010] Another disinfectant visualization sheet according to the present invention has a substrate, a colored portion provided on the substrate, and a covering portion on the colored portion, the colored portion having a visualization agent whose color state changes when a disinfectant is applied thereto, and the covering portion having polyethyleneimine. Effect of the Invention

[0011] The disinfectant-visualizing sheet and disinfectant-visualizing particles according to the present invention can be stored for a long period of time, and repeated application of the disinfectant can be easily confirmed visually. [Brief description of the drawings]

[0012] [Figure 1]FIG. 1 is a schematic diagram of a disinfectant-visualizing sheet according to a first embodiment of the present invention. [Diagram 2] FIG. 1 is a schematic diagram showing an example of a disinfectant visualizing sheet according to a first embodiment of the present invention. [Diagram 3] FIG. 4 is a schematic diagram of disinfectant-visualizing particles according to a second embodiment of the present invention. [Figure 4] FIG. 11 is a schematic diagram showing another example of the disinfectant visualizing sheet according to the second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to these.

[0014] In this embodiment, the surface to be sterilized may be any surface, such as a desk, table, chair, floor, wall, etc., and may be either horizontal or vertical. The surface to be sterilized may be a wood, plastic, or metal surface, and the device may be installed by attaching a sheet to the surface or coating the surface with particles.

[0015] In this embodiment, the disinfectant and the visualization agent are separately arranged, and react with each other when used. The visualization agent is arranged on the surface to be disinfected, and the color state (appearance) changes when the disinfectant is brought into contact with the surface. This change in appearance can be visually recognized.

[0016] The disinfectant visualization sheet according to the present embodiment includes a substrate, a coloring portion provided on the substrate, and a coating portion on the coloring portion, the coloring portion having a visualization agent whose color state changes when a disinfectant is applied, and the coating portion has a silsesquioxane structure. Here, the thickness of the coating portion is preferably 10 nm or more and 300 nm or less. Furthermore, the coating portion preferably has a silsesquioxane structure containing at least one functional group selected from the group consisting of a vinyl group, an epoxy group, an amino group, a styryl group, a methacryl group, an acrylic group, an isocyanurate group, a ureido group, a mercapto group, and an isocyanate group.

[0017] A disinfectant visualization sheet according to another embodiment of the present invention has a substrate, a color portion provided on the substrate, and a covering portion on the color portion, the color portion having a visualization agent whose color state changes when a disinfectant is applied thereto, and the covering portion having polyethyleneimine.

[0018] Hereinafter, the disinfectant visualization sheet and the disinfectant visualization particles will be described as examples.

[0019] (First embodiment: disinfectant visualization sheet) The disinfectant visualization sheet 103 according to this embodiment has a base material 102 and a coloring portion 101 provided on the base material 102 (FIG. 1). The coloring portion 101 has a visualization agent (not shown) whose coloring state changes when a disinfectant is applied. By using the disinfectant visualization sheet according to this embodiment in this way, the application of the disinfectant can be confirmed by visually checking the change in coloring state, which is convenient. In addition, the disinfectant and the visualization agent are mixed when the disinfectant is applied to the disinfectant visualization sheet, and the time during which the disinfectant and the visualization agent are mixed is short. Therefore, the material used can be easily stored for a long time. Here, application of the disinfectant means that the disinfectant reaches the visualization agent, and examples of this include spraying the disinfectant and wiping with a duster containing the disinfectant.

[0020] <Colored part> The colored portion in this embodiment contains at least a visualization agent. The colored portion may contain a binder to improve adhesion to the substrate. The binder may be a resin, such as a urethane resin or polyvinyl alcohol.

[0021] In this embodiment, the thickness of the colored portion is preferably 1 μm to 80 μm, more preferably 5 μm to 60 μm, and even more preferably 15 μm to 50 μm. By making the thickness of the colored portion 80 μm or less, the adhesion to the substrate is improved, and by making the thickness of the colored portion 1 μm or more, the colored state of the colored portion is improved.

[0022] The colored portion in this embodiment may be provided on at least a part of the substrate, and may be provided on the entire surface. Examples of the colored portion provided on at least a part of the substrate include a polka dot pattern and a checkerboard pattern. In addition, the starting position and the ending position of wiping when wiping with a disinfectant may be indicated by the pattern of the colored portion. In addition, when the colored portion is provided on a rectangular substrate, the pattern may be such that the area of ​​the colored portion near the center is smaller than that of the four corners.

[0023] The visualization agent in this embodiment is not particularly limited as long as it changes its color state by reacting with the disinfectant described below. In this embodiment, the change in color state refers to a change in which the color difference can be visually confirmed before and after the application of the disinfectant. For example, any of the following changes may occur: a change from a state that is invisible to the naked eye to a state that is visible to the naked eye, a change from a state that is visible to the naked eye to a state that is invisible to the naked eye, and a color change that can be visually recognized.

[0024] Here, visually recognizable color changes include changes in color shades and color changes. A change in color shade is, for example, a change from dark red to light red, and a color change is, for example, a change from red to blue. Visually recognizable color changes also include, for example, a change from colorless to colored and vice versa.

[0025] The visualization agent may be a combination of a plurality of materials that exhibit different changes in color state.

[0026] The phenomenon of changing the color state is chromism. Examples of chromism include photochromism, thermochromism, electrochromism, acidichromism, solvatochromism, and vapochromism. In the present embodiment, a substance that causes these phenomena is called a chromic substance, and can be specifically called a photochromic substance, a thermochromic substance, an electrochromic substance, an acidichromic substance, a solvatochromic substance, or a vapochromic substance.

[0027] Acidichromic substances change color with changes in pH, and the color range varies depending on the properties of each substance. For example, metanil yellow, metacresol purple, thymol blue, tropaeoline O, 2,4-dinitrophenol, methyl yellow, bromophenol blue, Congo red, methyl orange, bromochlorophenol blue, alizarin red S, bromocresol green, methyl orange-xylene cyanol FF, 2,5-dinitrophenol, methyl orange-indigo carmine, methyl red, methyl orange-xylene cyanol FF-phenolphthalein, lacmoid, chlorophenol red, o-nitrophenol, p-nitrophenol, bromocresol green-methyl red, bromocresol purple, bromophenol red, methyl red-methylene blue, bromothymol blue, neutral red, phenol red, neutral red-bromothymol blue, cresol red, α-naphtholphthalein, bromothymol blue-phenol red, curcumin, phenolphthalein, cresol red-thymol blue, o-cresolphthalein, α-naphtholbenzein, thymolphthalein, thymol blue-phenolphthalein, Alizarin Yellow GG, Alizarin Yellow R, Tropaeolin O, nitramine, 1,3,5-trinitrobenzene, indigo carmine, methyl violet, litmus, and methyl purple. From the viewpoint of low toxicity, metanil yellow, meta-cresol purple, thymol blue, tropaeolin O, bromophenol blue, bromochlorophenol blue, alizarin red S, bromocresol green, methyl red, lacmoid, chlorophenol red, o-nitrophenol, bromocresol purple, bromophenol red, bromothymol blue, neutral red, phenol red, cresol red, α-naphtholphthalein, phenolphthalein, o-cresolphthalein, thymolphthalein, alizarin yellow GG, alizarin yellow R, tropaeolin O, methyl violet, litmus, and methyl purple are preferable.More preferred are metacresol purple, thymol blue, tropeolin O, bromophenol blue, bromochlorophenol blue, alizarin red S, bromocresol green, methyl red, lacmoid, chlorophenol red, o-nitrophenol, bromocresol purple, bromophenol red, bromothymol blue, neutral red, phenol red, cresol red, α-naphtholphthalein, phenolphthalein, o-cresolphthalein, thymolphthalein, alizarin yellow GG, alizarin yellow R, litmus, and methyl purple, as they change color at a pH between 3 and 11. The substance that changes color in the alkaline pH range is at least one selected from the group consisting of p-nitrophenol, bromothymol blue, neutral red, phenol red, cresol red, phenolphthalein, cresolphthalein, thymolphthalein, alizarin yellow, troperion, and indigo carmine. It is desirable that the color change occurs when the disinfectant is alkaline and when the disinfectant is acidic.

[0028] Two or more types of visualization agents may be used. For example, it is preferable to use visualization agents that maintain their color for different periods of time, since this can serve as an indicator to show the time since the disinfectant came into contact.

[0029] The visualizing agent may be provided to show text information, image information (figure), or both image information and text information. Although the text information and image information are not particularly limited, it is considered that if the visualizing agent shows text information or image information that is pleasing to the user of the sterilized area, the user will be more likely to apply the sterilizing agent voluntarily. The visualizing agent changes color and recovers as the sterilizing agent evaporates. Here, recovery means that the color returns to the state before the sterilizing agent was applied. In other words, the coloring state is reversible. That is, the visualizing agent in this embodiment can be one that changes color for a certain period of time when the sterilizing agent is applied, and then returns to the state before the sterilizing agent is applied. For example, the visualizing agent can be made to change from a state invisible to the naked eye to a state visible to the naked eye when the sterilizing agent is applied, and then return to the state invisible to the naked eye after a certain period of time has passed. In this way, the visualizing agent is reversible, and can be used in situations where sterilization needs to be repeated.

[0030] Two or more types of visualization agents may be used. For example, it is preferable to use visualization agents that maintain their color for different periods of time, since this can serve as an indicator to show the time since the disinfectant came into contact.

[0031] <Base material> The substrate in this embodiment may be any substrate on which a color-developing portion is provided.

[0032] When the substrate is a resin sheet, it is preferable because it is lightweight and flexible. Examples of the resin sheet include polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene terephthalate / isophthalate copolymer; polyolefin resins such as polyethylene, polypropylene, and polymethylpentene; polyvinyl fluoride, polyvinylidene fluoride, polytetrafluoroethylene, and ethylene-tetrafluoroethylene copolymer-based polyfluorinated ethylene resins; aliphatic polyamide resins such as nylon 6 and nylon 6,6; vinyl polymer resins such as polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, ethylene / vinyl acetate copolymer, ethylene / vinyl alcohol copolymer, polyvinyl alcohol, and vinylon; cellulose resins such as cellulose triacetate and cellophane; acrylic resins such as polymethyl methacrylate, polyethyl methacrylate, polyethyl acrylate, and polybutyl acrylate; other synthetic resins such as polystyrene, polycarbonate, polyarylate, and polyimide; and the like. The resin sheet may be used alone or in combination or laminated form of two or more types. It is preferable to provide a receiving layer for holding the colored portion on the substrate. This is because when the visualization agent is ink, it is easier for the receiving layer to retain the ink.

[0033] In the present embodiment, it is preferable that the receiving layer of the substrate does not react with the visualization agent. For example, in the case of a visualization agent that changes color in an alkaline state, it is preferable that the receiving layer is neutral or acidic. If the receiving layer reacts with the visualization agent, it will change color before reacting with the disinfectant, which is undesirable.

[0034] The substrate in this embodiment may be transparent, opaque, or colored. If the visualization agent is colored before it reacts with the disinfectant, it is preferable that the substrate be colored in a color close to that color.

[0035] In this embodiment, the substrate may be made of release paper, metal plate, wood, or the like. An adhesive may be provided to bond the substrate to another member. The adhesive may be provided on the entire surface of the substrate, or on a portion of the substrate. The adhesive is easily peeled off when it is provided on a portion of the substrate. The adhesive may be easily peeled off when it contains a UV-curable resin.

[0036] When the substrate is paper, the coloring portion may contain an anionic, cationic, nonionic, or other surfactant to facilitate compatibility of the visualization agent with the paper. As the surfactant, it is preferable to use a nonionic surfactant such as polyoxyethylene alkyl ether, polyoxyethylene fatty acid ester, polyoxyethylene alkyl phenyl ether, polyoxyethylene-polyoxypropylene block copolymer, or acetylene glycol compound.

[0037] <Coated part> The disinfectant visualization sheet 103 in this embodiment may have a covering portion 104 on the colored portion 101 that holds the disinfectant and enables repeated use (FIG. 2).

[0038] In this embodiment, the covering portion 104 provided on the coloring portion is required to be permeable to a sufficient degree of disinfectant to cause the visualization agent to develop a color, and to be durable enough to withstand repeated wiping with the disinfectant. When using a combination of a neutral disinfectant and a visualization agent having a coloring range on the alkaline side, it is preferable to make the covering portion out of an alkaline material.

[0039] For example, the coating portion may be an organic-inorganic hybrid material such as an acrylic resin, a vinyl chloride resin, a polyamide resin, a polyester resin, a urethane resin, or a polyethyleneimine resin, or a polyphosphazene or a silsesquioxane. Among them, silsesquioxane is preferable. Silsesquioxane (hereinafter sometimes abbreviated as SQ) is a siloxane-based compound whose main chain skeleton is composed of Si-O bonds, and is represented by the composition formula [R1(SiO1.5)n]. The R1 is preferably at least one substituent selected from the group consisting of a vinyl group, an epoxy group, an amino group, a styryl group, a methacryl group, an acrylic group, an isocyanurate group, a ureido group, a mercapto group, and an isocyanate group. When silsesquioxane plays a role of binding particles composed of a large number of solid substances, it is possible to achieve a superior film strength while maintaining a high porosity. Silsesquioxane is not particularly limited in the form of polymer, and examples thereof include known linear polysiloxane, cage polysiloxane, ladder polysiloxane, etc. The silsesquioxane structure is a structure in which each silicon atom is bonded to three oxygen atoms, and each oxygen atom is bonded to two silicon atoms (the number of oxygen atoms relative to the number of silicon atoms is 1.5). From the viewpoint of cost, linear polysiloxane, cage polysiloxane, and ladder polysiloxane may be mixed.

[0040] Silane coupling agents, which are the raw material for silsesquioxane, include vinyltrimethoxysilane, vinyltriethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, N-2-(aminoethyl)-3-aminopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, Examples of suitable silanes include p-styryltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane, 3-acryloxypropyltrimethoxysilane, tris-(trimethoxysilylpropyl)isocyanurate, 3-ureidopropyltrialkoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, and 3-trimethoxysilylpropylsuccinic anhydride.

[0041] One or more of these may be used.

[0042] The above-mentioned silane coupling agent may be dissolved in a solvent to prepare a coating liquid. The solvent is preferably an organic solvent. The organic solvent is not particularly limited, but may be alcohol, carboxylic acid, aliphatic or alicyclic hydrocarbons, aromatic hydrocarbons, esters, ketones, ethers, or a mixture of two or more of these. The alcohol may be, for example, methanol, ethanol, 2-propanol, butanol, 2-methoxyethanol, 2-ethoxyethanol, 1-methoxy-2-propanol, 1-ethoxy-2-propanol, 1-propoxy-2-propanol, 4-methyl-2-pentanol, 2-ethylbutanol, 3-methoxy-3-methylbutanol, ethylene glycol, diethylene glycol, glycerin, or the like. As the carboxylic acid, specifically, n-butyric acid, α-methylbutyric acid, i-valeric acid, 2-ethylbutyric acid, 2,2-dimethylbutyric acid, 3,3-dimethylbutyric acid, 2,3-dimethylbutyric acid, 3-methylpentanoic acid, 4-methylpentanoic acid, 2-ethylpentanoic acid, 3-ethylpentanoic acid, 2,2-dimethylpentanoic acid, 3,3-dimethylpentanoic acid, 2,3-dimethylpentanoic acid, 2-ethylhexanoic acid, and 3-ethylhexanoic acid are preferably used. As the aliphatic or alicyclic hydrocarbons, specifically, n-hexane, n-octane, cyclohexane, cyclopentane, and cyclooctane are preferable. As the aromatic hydrocarbons, toluene, xylene, and ethylbenzene are preferable. As the esters, ethyl formate, ethyl acetate, n-butyl acetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, and γ-butyrolactone are preferable. Preferred ketones include acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc. Preferred ethers include dimethoxyethane, tetrahydrofuran, dioxane, diisopropyl ether, etc.

[0043] In preparing the coating solution, it is preferable to use alcohols among the above-mentioned various solvents from the viewpoint of solution stability.

[0044] The coating liquid can be prepared by adding a predetermined amount of a silane coupling agent to an organic solvent.

[0045] When forming a layer using a coating liquid, it is preferable to carry out the coating in an atmosphere of dry air or an inert gas such as dry nitrogen. The relative humidity of the dry atmosphere is preferably 30% or less.

[0046] Furthermore, as a solution coating method for forming a layer, known coating means can be appropriately adopted, such as, for example, dipping, spin coating, spraying, printing, flow coating, and combinations of these. The film thickness can be controlled by changing the pulling speed in the dipping method or the substrate rotation speed in the spin coating method, and by changing the concentration of the coating solution.

[0047] In this embodiment, the thickness of the coating portion is preferably 10 nm to 1 μm, more preferably 10 nm to 500 nm, and even more preferably 10 nm to 300 nm. By setting the thickness of the coating portion to 1 μm or less, a good balance between the coloring state and durability of the colored portion is achieved.

[0048] <Disinfectant> The disinfectant in this embodiment is used for purposes such as sterilization, disinfection, and sterilization, and may be a liquid composition that reacts with the visualization agent to change the color state. Examples of the active ingredient include a surfactant, a basic ingredient, an acidic ingredient, and an alcohol. Examples of the basic ingredient include an alkali, perchloric acid, hypochlorous acid, and furthermore, a sodium salt thereof. The reaction between the disinfectant and the visualization agent in this embodiment may occur in a liquid or at a solid-liquid interface, and may occur under normal temperature and pressure conditions, or under conditions of heating, cooling, or pressure application. Examples of the principle include the above-mentioned photochromism, thermochromism, electrochromism, acidichromism, solvatochromism, and vaporchromism. The reaction may be irreversible or reversible. The disinfectant in this embodiment may use a weakly acidic material. Examples of the weakly acidic material include organic acids such as citric acid, malic acid, lactic acid, and succinic acid, and weakly acidic hypochlorous acid water.

[0049] <Another example of a disinfectant visualization sheet> In another example of the disinfectant visualization sheet in this embodiment, the color-developing portion may be provided with visualization particles that contain a visualization agent and carrier particles that carry the visualization agent. An aggregate of the visualization particles can function as the color-developing portion. When the visualization particles are used, the positions of the moisture-retaining layer and the layer containing the visualization particles can be designed microscopically, making it possible to design precise characteristics.

[0050] <Invisible parts> In yet another example of the disinfectant visualization sheet in this embodiment, in addition to the visualization agent, a combination of multiple principles can be used. An invisible part can be provided on the sheet having the colored part. The invisible part in this embodiment can be provided with an invisible material that absorbs light of wavelengths in the ultraviolet and infrared regions. The ultraviolet and infrared regions include near ultraviolet and near infrared. By providing an invisible agent, in addition to visual confirmation of the application of the disinfectant, additional confirmation can be made from a third-party perspective.

[0051] Furthermore, in the disinfectant visualization sheet of this embodiment, thermochromism can be used in combination. For example, a dye that changes color depending on temperature is used in the coloring portion. This not only changes the color depending on the presence or absence of disinfectant, but also changes the color when the temperature changes from the environment in which it is used. This makes it possible to indirectly know the history of touch, etc. The thermochromic dye can be selected from known substances.

[0052] Among the invisible materials in this embodiment, the dye that absorbs light of wavelengths in the infrared region may be at least one selected from the group consisting of phthalocyanine dyes, naphthalocyanine dyes, metal complex dyes, polymethine dyes, quinone dyes, azo dyes, diphenylmethane and triphenylmethane dyes, radical dyes, perimidine dyes, and Au nanorods. The dye that absorbs light in the ultraviolet region and emits fluorescence may be at least one selected from the group consisting of merocyanine, perylene, acridine, luciferin, pyranine, stilbene, rhodamine, coumarin, and fluorescein.

[0053] <Visible wavelength range, infrared and ultraviolet wavelength range> In this embodiment, the visible wavelength range is light in the wavelength range of 360 nm to 830 nm, the infrared wavelength range is light in the wavelength range of 900 nm to 14 μm, and the ultraviolet wavelength range is light in the wavelength range of 100 nm to 400 nm.

[0054] <Marking composition> The colored portion provided on the disinfectant visualization sheet in this embodiment may be provided as a marking indicating whether or not the disinfectant has been applied (whether or not the disinfectant has been cleaned). In this embodiment, the material for marking can be called a marking composition. The marking composition contains the visualization agent and a solvent, and examples of the solvent include hydrophobic solvents and aqueous solvents. Examples of the hydrophobic solvent include organic solvents such as heptane and petroleum ether, and examples of the aqueous solvent include water and alcohol.

[0055] In addition, when the visualization agent is poorly soluble in water, a dispersant for dispersing the visualization agent in water is included. As the dispersant, a wide variety of conventionally known dispersants can be used.

[0056] When the visualizing agent is colored by acidichromism, it is particularly preferable that the dispersant has one or more functional groups selected from a polyethylene oxide group, a polypropylene oxide group, and a polyglycerin group. This is because acidichromism requires the mediation of water, and it is presumed that the presence of these functional groups in the vicinity of the visualizing agent makes it easier for water to be attracted, which makes it easier to color. In addition, the water retention effect of these functional groups makes it easier to continue coloring. In particular, when the visualizing agent is thymol blue or orthocresolphthalein, which is colored by acidichromism, a dispersant having one or more functional groups selected from a polyethylene oxide group, a polypropylene oxide group, and a polyglycerin group is preferable for the above reasons.

[0057] On the other hand, if a highly hydrophobic dispersant is used, such as a styrene-maleic acid copolymer with a molecular weight of 10,000 or more, the dispersant may cover the visualization agent in the colored area, inhibiting the coloration by the disinfectant.

[0058] As dispersants having one or more functional groups selected from a polyethylene oxide group, a polypropylene oxide group, and a polyglycerin group, preferred are EO-PO block polymer-based dispersants mainly composed of a copolymer of ethylene oxide (EO) and propylene oxide (PO) (product names: DisperBYK 183, DisperBYK185, DisperBYK190, etc., manufactured by BYK-Chemie), decaglycerin-based dispersants (product names: Nikkol Decaglycerin 1-ISV, etc., manufactured by Nikko Chemical), and ethylene oxide-based dispersants (product names: Emulgen 420, manufactured by Kao), among which EO-PO block polymer-based dispersants are preferred.

[0059] These dispersants are used in an amount of 30% to 200% based on the total mass of the visualization agent, and are dispersed by a conventionally known method to form ink components.

[0060] As the aqueous solvent in this embodiment, water or a mixed medium in which water is the main solvent and a protic organic solvent or an aprotic organic solvent is used in combination can be used. As the organic solvent in this embodiment, it is preferable to use one that is miscible or soluble with water at any ratio, and it is preferable to use a uniform mixed medium containing 50 mass % or more of water. As the water, it is preferable to use deionized water (ion-exchanged water) or ultrapure water.

[0061] A protic organic solvent is an organic solvent having a hydrogen atom (acidic hydrogen atom) bonded to oxygen or nitrogen. An aprotic organic solvent is an organic solvent having no acidic hydrogen atom. Examples of the organic solvent include alcohols, alkylene glycols, polyalkylene glycols, glycol ethers, glycol ether esters, carboxylic acid amides, ketones, ketoalcohols, and cyclic ethers.

[0062] Examples of suitable aqueous media include water, a water / ethanol mixed solvent, a water / ethylene glycol mixed solvent, a water / N-methylpyrrolidone mixed solvent, etc. The water content is preferably 10.0% by mass or more and 90.0% by mass or less, and more preferably 50.0% by mass or more and 90.0% by mass or less, based on the total mass of the composition.

[0063] The content of the water-soluble organic solvent in the composition is preferably from 5.0% by mass to 90.0% by mass, and more preferably from 10.0% by mass to 50.0% by mass, based on the total mass of the composition.

[0064] (Other additives) In addition to the above-mentioned components, the marking composition in this embodiment may contain water-soluble organic compounds such as polyhydric alcohols such as trimethylolpropane and trimethylolethane, and urea derivatives such as urea and ethyleneurea, if necessary. Furthermore, the marking composition in this embodiment may contain various additives such as surfactants, pH adjusters, rust inhibitors, preservatives, antifungal agents, antioxidants, reduction inhibitors, evaporation promoters, chelating agents, and water-soluble resins, if necessary. Examples of the above surfactants include anionic, cationic, and nonionic surfactants. The content of the surfactant in the marking composition is preferably 0.1% by mass or more and 5.0% by mass or less, and more preferably 0.1% by mass or more and 2.0% by mass or less, based on the total mass of the composition. Specific examples of the above surfactants include nonionic surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene fatty acid esters, polyoxyethylene alkyl phenyl ethers, polyoxyethylene-polyoxypropylene block copolymers, and acetylene glycol compounds.

[0065] When the marking composition of the present embodiment is discharged from an inkjet recording head to record an image on a recording medium, it is preferable to use a marking composition whose surface tension and viscosity are appropriately controlled. Specifically, the concentration of the color former compound in the marking composition is preferably about 5% to 20%. The surface tension of the composition at 25°C is preferably 10 mN / m or more and 60 mN / m or less, more preferably 20 mN / m or more and 60 mN / m or less, and particularly preferably 30 mN / m or more and 50 mN / m or less.

[0066] The viscosity of the composition at 25° C. is preferably 1.0 mPa·s or more and 10 mPa·s or less, and more preferably 1.0 mPa·s or more and 5 mPa·s or less.

[0067] <Image Recording Method (Method of Applying Marking Composition)> The image recording method in this embodiment relates to a method of applying the marking composition to a substrate. Various methods can be used for the image recording method in this embodiment, and examples of such methods include an inkjet method, a flexographic method, a screen method, an offset method, and a spin coating method. For example, the inkjet method is a method in which the marking composition in this embodiment is discharged from an inkjet recording head to record an image on a recording medium. Methods for discharging the marking composition include a method of applying mechanical energy to the marking composition and a method of applying thermal energy to the composition. Other than using the marking composition in this embodiment, known methods can be used for the steps of the inkjet recording method.

[0068] In addition to the above image recording methods, an electrophotographic method can be used as the image recording method.

[0069] <Toner manufacturing method> The method for producing the toner in the electrophotographic system of the present embodiment is not particularly limited, but the following toner production methods (1) to (3) can be exemplified.

[0070] (1) Crushing method When producing a toner by the pulverization method, first, the visualization agent is thoroughly mixed with the binder resin, which is a dispersion medium, and other additives in a mixer such as a Henschel mixer or a ball mill. The mixture is melted and kneaded in a thermal kneader that uses heat and mechanical shear force, such as a kneader or an extruder, to make the resins compatible with each other. The molten and kneaded mixture is cooled and solidified, and then the solidified product is pulverized, and the pulverized product is classified to obtain toner particles of the desired particle size.

[0071] (2) Suspension polymerization method In the suspension polymerization method, for example, a visualization agent, a polymerizable monomer capable of forming a binder resin, and optionally a polymerization initiator, a crosslinking agent, a charge control agent, and other additives are uniformly dispersed to obtain a polymerizable monomer composition. The obtained polymerizable monomer composition is then dispersed and granulated in a continuous layer (e.g., an aqueous phase) containing a dispersion stabilizer using an appropriate stirrer, and a polymerization reaction is carried out using a polymerization initiator to obtain toner particles having a desired particle size.

[0072] (3) Emulsion aggregation method When producing a toner by the emulsion aggregation method, first, each material such as a visualization agent, a binder resin, and other additives is dispersed and mixed in an aqueous medium containing a dispersion stabilizer. A surfactant may be added to the aqueous medium. Then, an aggregating agent is added to aggregate the particles until the desired toner particle size is obtained, and then or simultaneously with the aggregation, the resin particles are fused together. If necessary, the shape is controlled by heat to form toner particles. Then, the toner particles are obtained through a filtration, washing, and drying process.

[0073] In addition, if necessary, a process of dispersing the visualization agent in the binder resin may be provided in the series of toner production processes. As a method of dispersing the visualization agent in the binder resin, for example, a method of using a masterbatch in the toner production process can be exemplified. That is, the visualization agent is mixed with a part of the binder resin so as to have a high concentration, and melt-kneaded while applying a high shear to produce a masterbatch in which the visualization agent is finely dispersed. Then, the masterbatch is melt-kneaded while being diluted with the remaining binder resin. Examples of melt-kneading devices that are preferably used in producing the masterbatch include a kneader, a Banbury mixer, a two-roll mill, a three-roll mill, etc., which can be used alone or in combination. Examples of melt-kneading devices used in dilution kneading include a twin-screw kneader, etc. In addition, if necessary, a process of suppressing aggregation of the visualization agent may be provided in the series of toner production.

[0074] An example of a method for suppressing the aggregation of the visualization agent during toner production is a method of rapidly cooling after the melt-kneading step. For example, the melt-kneaded material can be rapidly cooled by spreading it into a sheet on a water-cooled metal belt. Rapid cooling can suppress the aggregation of the visualization agent that occurs during cooling. Examples of suitable cooling devices for rapid cooling include "High Viscosity NR Double Belt Cooler (manufactured by Nippon Belting Co., Ltd.)", "Cooling Solidification Machine Belt Drum Flaker (manufactured by Nippon Coke & Co., Ltd.)", and "Cooling Solidification Device Drum Flaker (manufactured by Katsuragi Kogyo Co., Ltd.)".

[0075] The step of dispersing the visualization agent in the binder resin and the method of suppressing aggregation of the visualization agent may be used in combination.

[0076] <Various additives> If necessary, the toner may contain one or more additives selected from wax, charge control agents, external additives, etc. In addition, the toner according to the present disclosure preferably does not contain a coloring component that makes the fixed image a visible image.

[0077] <Wax> The wax is not particularly limited, but colorless or light-colored waxes are preferred, and examples thereof include the following. Hydrocarbon wax, ester wax, amide wax, higher aliphatic alcohol, higher fatty acid, etc. One type of wax may be used alone, or multiple types may be used in combination.

[0078] <Charge control agent> The charge control agent is not particularly limited, but colorless or light-colored charge control agents are preferred, and examples thereof include the following. Aromatic oxycarboxylic acids, metal compounds of aromatic oxycarboxylic acids, boron compounds, quaternary ammonium salts, calixarenes, resins having sulfonic acid (salt) groups, resins having sulfonate ester groups, etc. The charge control agents may be used alone or in combination of two or more.

[0079] <External additives> The external additive is not particularly limited, but is preferably a colorless or light-colored one, and examples thereof include silica, alumina, titanium oxide, strontium titanate, silicon nitride, polytetrafluoroethylene, zinc stearate, etc. The surface of the external additive may be subjected to a hydrophobic treatment.

[0080] Moreover, the average particle size of the primary particles of the external additive is preferably 1 / 10 or less of the weight average particle size (D4) of the toner particles.

[0081] <Developer> The toner can be used as a one-component developer, but may also be mixed with a carrier to be used as a two-component developer. As the carrier, magnetic particles made of known materials such as metals such as iron, ferrite, and magnetite, and alloys of these metals with metals such as aluminum and lead, can be used. In addition, a coated carrier in which the surface of the carrier is coated with a coating agent such as a resin, or a resin-dispersed carrier in which magnetic particles are dispersed in a binder resin may also be used. The volume average particle diameter of the carrier is preferably 15 μm or more and 100 μm or less, more preferably 25 μm or more and 80 μm or less.

[0082] (Second embodiment: disinfectant visualization particles) The disinfectant visualization particle 303 according to the present embodiment changes its color state when a disinfectant is applied. Specifically, the disinfectant visualization particle 303 has a visualization agent 302 whose color state changes when a disinfectant is applied, and a support particle 301 that supports the visualization agent. The disinfectant visualization particle 303 according to the present embodiment may have a decolorization time control section. The decolorization time control section does not necessarily have to be in a layered form. A porous particle can be used as the decolorization time control section. For example, at least one selected from the group consisting of mesoporous silica particles, porous silica particles, porous titania particles, porous zirconia particles, porous ceria particles, porous zinc oxide particles, porous crosslinked polymethyl methacrylate particles, porous crosslinked polystyrene particles, and porous methyl methacrylate-styrene copolymer crosslinked particles can be used. The disinfectant visualization particle having a colored section can be formed by impregnating the porous particle with a solution in which the visualization agent is dissolved and drying it.

[0083] The surfaces of the porous particles may be treated to be hydrophilic or hydrophobic. When the disinfectant is aqueous, hydrophilicity is preferred, and when it is not aqueous, hydrophobicity is preferred.

[0084] In addition, the disinfectant visualization particles are preferable because they have high rigidity and therefore are highly durable even if wiped repeatedly with a disinfectant.

[0085] The particle size of the disinfectant visualization particles is preferably 30 nm to 5 μm, more preferably 50 nm to 3 μm, and particularly preferably 80 nm to 1 μm. By setting the particle size to 30 nm or more, the particles are less likely to aggregate. Furthermore, by setting the particle size to 5 μm or less, the disinfectant visualization particles are less likely to settle when dispersed in a solution.

[0086] <Sheet using disinfectant visualized particles> The disinfectant visualization particles according to this embodiment can also be used as a sheet using disinfectant visualization particles by providing disinfectant visualization particles 303 on a substrate 102 as shown in FIG.

[0087] <Coating fluid and coated products with visualized particles> The disinfectant-visualizing particles according to the present embodiment can also be used as a coating liquid such as a dispersion liquid or a slurry. The coating liquid can also be applied to an article to form a coated product.

[0088] <Modification of visualized particles> The disinfectant visualization particles according to the present embodiment do not necessarily have to be in a particle shape. For example, they may be in a rod shape, a plate shape, or a film shape. In the case of a film shape, it is particularly preferable to provide a decolorization time control unit in order to maintain strength against wiping off the disinfectant.

[0089] (Third embodiment: disinfectant visualization method) An example of a disinfectant visualization method in this embodiment includes a step of providing the disinfectant visualization sheet according to the first embodiment on a surface to be disinfected, and a step of applying a disinfectant to the disinfectant visualization sheet provided on the surface to be disinfected.

[0090] The disinfectant visualization method according to another embodiment of the present invention includes a step of applying disinfectant visualization particles according to the second embodiment to a surface to be disinfected, and a step of applying a disinfectant to the disinfectant visualization particles provided on the surface to be disinfected. EXAMPLES

[0091] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples as long as it does not go beyond the gist of the present invention. In addition, the amounts of components are based on mass unless otherwise specified. The abrasion resistance test in the examples was performed as follows. A load of 100 g was applied to a slider attached with Silbon paper using a surface property tester HEIDON Type:38 (manufactured by Shinto Scientific Co., Ltd.), and the sample was abraded for 1 minute at a speed of 50 reciprocations per minute. The abrasion resistance was evaluated by optical microscope observation and reflectance measurement. An optical microscope (Olympus, BX51M) was used for the optical microscope observation.

[0092] <Production of disinfectant visualization sheets> <Example 1> As a visualization agent, 70 ml of ultrapure water, 30 ml of ethylene glycol, and 0.1 g of a surfactant (product name: Olfin PD-005, manufacturer: Nissin Chemical Industry Co., Ltd.) were added to 0.5 g of phenolphthalein (Tokyo Chemical Industry Co., Ltd.) to prepare a composition. The composition was filled into an ink cartridge and set in an inkjet recording device (PIXUS iP7230, Canon) that ejects ink from a recording head by the action of thermal energy. In this embodiment, a solid image recorded by applying eight ink droplets of 2.5 pL per droplet to a unit area of ​​1 / 600 inch x 1 / 600 inch is defined as having a "recording duty of 100%". A solid image with a recording duty of 100% was recorded using this inkjet recording device in an environment with a temperature of 23°C and a relative humidity of 55%. Glossy paper (product name: Glossy Pro PT-201, manufacturer: Canon) was used as the substrate. The obtained recorded matter was dried for 24 hours in an environment of a temperature of 23° C. and a relative humidity of 55%, to obtain a print (shape: a rectangular image of 2 mm×3 cm).

[0093] A coating was formed on this printed matter as follows. 10 g of ethanol (Kishida Chemical Co., Ltd.) was added to 10 g of 3-aminopropyltrimethoxysilane (Tokyo Chemical Industry Co., Ltd.). This solution was applied using a Baker-type applicator (Tester Sangyo Co., Ltd.) so that the thickness h when dried would be 150 nm. It was then placed on a hot plate heated to 50°C for 30 minutes and dried. This is Sheet 1.

[0094] <Examples 2 to 48> The visualization agent and the thickness h of the decolorization time control section were changed as shown in Table 1, but other than that, disinfectant visualization sheets (sheets 2 to 50) were prepared in the same manner as in Examples 2 to 50.

[0095] <Comparative Example 1> The product of Example 12 in which the covering portion was not formed was used as Comparative Example 1.

[0096] <Example 49> Visualization agent: O-cresolphthalein: 2.0 parts Dispersant: Dispersant BKY 190 manufactured by BYK: 0.8 parts Ion-exchanged water: 16 parts

[0097] The above was dispersed (Fritsch planetary ball mill, 300 rpm, 4 hours, media: zirconia beads, 0.5 mm diameter, media filling rate: 70%), diluted with a 15% aqueous glycerin solution so that the visualization agent concentration was 5% relative to the total mass of the marking composition, stirred with a stirrer for 1 hour, and then filtered through a 0.5 μm filter to obtain a marking composition for visualization agent.

[0098] A sterilization visualization sheet 49 was prepared in the same manner as in Example 1 except for the above, and designated as Example 49.

[0099] <Example 50> Visualization agent: Thymolphthalein: 2.0 parts Dispersant: Dispersant BKY 190 manufactured by BYK: 2.0 parts Ion-exchanged water: 16 parts

[0100] The above was dispersed (Fritsch planetary ball mill, 300 rpm, 4 hours, media: zirconia beads, 0.5 mm diameter, media filling rate: 70%), diluted with a 15% aqueous glycerin solution so that the visualization agent concentration was 5% relative to the total mass of the marking composition, stirred with a stirrer for 1 hour, and then filtered through a 0.5 μm filter to obtain a marking composition for visualization agent.

[0101] A sterilization visualization sheet 49 was prepared in the same manner as in Example 1 except for the above, and designated as Example 49.

[0102] [Table 1]

[0103] The amino in the table stands for 3-aminopropyltrimethoxysilane. Amino 2 is N-2-(aminoethyl)-3-aminopropyltrimethoxysilane, Vinyl is vinyltrimethoxysilane, Epoxy is 3-glycidoxypropyltrimethoxysilane; Methacryl is 3-methacryloxypropyltrimethoxysilane; Acrylic is 3-acryloxypropyltrimethoxysilane, Styryl is p-styryltrimethoxysilane, The isocyanurate is tris-(trimethoxysilylpropyl) isocyanurate. The ureido is 3-ureidopropyltrialkoxysilane, Mercapto is 3-mercaptopropyltrimethoxysilane, The isocyanate represents 3-isocyanatepropyltrimethoxysilane.

[0104] <Examples 51 to 100> <Comparative Example 2> <Evaluation> <Evaluation (color change)> A 0.5 wt% aqueous solution of sodium hypochlorite and an 80% aqueous solution of ethanol were used as disinfectants. 1 ml of the disinfectant was dropped onto a Kimwipe, and the disinfectant was applied to the disinfectant visualization sheet with the Kimwipe. The sheet was placed on a piece of white paper and filmed on a videotape. The filmed video was converted to a grayscale of 0 to 255, and the absolute value of the change in value before and after application was measured. Of the evaluation criteria shown below, "A" and "B" were considered acceptable levels, and "C" was considered an unacceptable level. A: 30 or older B: 15 to 30 C: Less than 15

[0105] <Evaluation (durability)> Regarding abrasion resistance, a grade of A was given to specimens that showed no noticeable abrasion marks when observed under an optical microscope after the abrasion test and showed no significant change in reflectance in the visible and infrared regions before and after the abrasion test. A grade of B was given to specimens that showed noticeable abrasion marks when observed under an optical microscope after the abrasion test or showed a significant change in reflectance in the visible and infrared regions before and after the abrasion test. Of the evaluation criteria shown below, "A" was an acceptable level and "B" was an unacceptable level. A: Small change in reflectance, no wear marks B: Large change in reflectance, wear marks

[0106] The results are shown in Table 2.

[0107] [Table 2]

[0108] In Comparative Example 2, when an abrasion test was carried out, noticeable abrasion marks were observed, and a significant change in the reflectance in the visible light and infrared regions was observed before and after the abrasion test.

[0109] The above disclosure includes the following configurations.

[0110] (Configuration 1) A substrate, a coloring portion provided on the substrate, and a covering portion on the coloring portion, The disinfectant-visualizing sheet, wherein the colored portion has a visualizing agent whose color state changes when a disinfectant is applied, and the covering portion has a silsesquioxane structure.

[0111] (Configuration 2) 2. The disinfectant-visualizing sheet according to configuration 1, wherein the thickness of the covering portion is 10 nm or more and 300 nm or less.

[0112] (Configuration 3) 3. The disinfectant-visualizing sheet according to configuration 1 or 2, wherein the coating portion has a silsesquioxane structure containing at least one functional group selected from the group consisting of a vinyl group, an epoxy group, an amino group, a styryl group, a methacryl group, an acrylic group, an isocyanurate group, a ureido group, a mercapto group, and an isocyanate group.

[0113] (Configuration 4) A disinfectant visualization sheet comprising a substrate, a color portion provided on the substrate, and a covering portion on the color portion, the color portion comprising a visualization agent whose color state changes when a disinfectant is applied thereto, and the covering portion comprising polyethyleneimine.

Claims

1. a substrate, a coloring portion provided on the substrate, and a covering portion on the coloring portion; the colored portion has a visualization agent whose color state changes when a disinfectant is applied, The disinfectant visualization sheet, wherein the covering portion has a silsesquioxane structure.

2. A sterilization visualization sheet as described in claim 1, characterized in that the thickness of the abdomen is 10 nm or more and 1 μm or less.

3. The disinfectant-visualizing sheet according to claim 1, wherein the thickness of the covering portion is 10 nm or more and 300 nm or less.

4. 2. The disinfectant visualization sheet according to claim 1, wherein the coating portion has a silsesquioxane structure containing at least one functional group selected from the group consisting of a vinyl group, an epoxy group, an amino group, a styryl group, a methacryl group, an acrylic group, an isocyanurate group, a ureido group, a mercapto group, and an isocyanate group.

5. A sterilization visualization sheet as described in claim 1, characterized in that the thickness of the colored portion is 1 μm or more and 80 μm or less.

6. A sterilization visualization sheet as described in Claim 1, characterized in that the coloring portion contains multiple visualization agents that maintain their coloration for different periods of time.

7. The sterilization visualization sheet described in Claim 1, characterized in that the visualization agent contains multiple materials that exhibit different color state changes.

8. A sterilization visualization sheet as described in claim 1, characterized in that the visualization agent changes color as the disinfectant evaporates, and returns to the state it was in before the disinfectant was applied.

9. The sterilization visualization sheet described in Claim 1, characterized in that the coloring portion contains visualization particles including the visualization agent and carrier particles that carry the visualization agent.

10. a substrate, a coloring portion provided on the substrate, and a covering portion on the coloring portion; the colored portion has a visualization agent whose color state changes when a disinfectant is applied, The disinfectant-visualizing sheet, wherein the covering portion contains polyethyleneimine.

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