Ink for visualizing disinfectant, and disinfectant visualization sheet

Abstract

To provide an ink that allows for the visual checking of disinfectant application.SOLUTION: An ink for visualizing a disinfectant comprises: a visualizing agent that shows a change in its coloring state upon application of a disinfectant and is poorly soluble in an aqueous liquid; a dispersing agent for dispersing the visualizing agent in the aqueous liquid; and the aqueous liquid.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to an ink for visualizing a disinfectant and a disinfectant visualizing 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] 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 in one liquid, making it difficult to store the product for a long period of time.

[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.

[0006] Patent Document 3 discloses a technology to develop color by embedding porous detection particles in the surface of a material. However, since the detection species is not water-soluble, a paste-like material like UV ink is deposited in advance after the detection species is sprayed. As a result, the resolution is insufficient. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] U.S. Patent No. 8,519,360 [Patent Document 2] US Patent Application Publication No. 2017 / 0336373 [Patent Document 3] Patent Publication No. 2020-101535 Summary of the Invention [Problem to be solved by the invention]

[0008] Therefore, an object of the present invention is to provide an ink that allows visual confirmation that a disinfectant has been applied. [Means for solving the problem]

[0009] The disinfectant visualization ink according to the present invention comprises a visualization agent whose color state changes when a disinfectant is applied and which is poorly soluble in an aqueous liquid, a dispersant that disperses the visualization agent in the aqueous liquid, and the aqueous liquid. Effect of the Invention

[0010] According to the disinfectant visualization ink of the present invention, it is possible to provide an ink that allows visual confirmation that a disinfectant has been applied. [Brief description of the drawings]

[0011] [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. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described. However, prior to describing an embodiment of the aqueous ink for producing a sterilization visualization sheet, an embodiment of a sterilization visualization sheet that uses the sterilizing agent visualization ink according to this embodiment will be described.

[0013] In this embodiment, the disinfectant visualization sheet 103 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 manner, 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. This allows easy long-term storage of the materials used.

[0014] Here, the application of the disinfectant means that the disinfectant reaches the visualization agent, and includes spraying the disinfectant or wiping with a duster containing the disinfectant. In the disinfection process by wiping with a duster, sodium hypochlorite, ethanol water, and the like are widely used as the disinfectant.

[0015] The disinfectant visualization ink according to this embodiment changes its color state when a disinfectant is applied, and contains a visualization agent that is poorly soluble in aqueous liquids, a dispersant that disperses the visualization agent in the aqueous liquid, and the aqueous liquid.

[0016] In the present embodiment, the dispersant preferably has at least one functional group selected from the group consisting of a polyethylene oxide group, a polypropylene oxide group, and a polyglycerin group, and preferably has a copolymer containing a repeating unit derived from ethylene oxide and a repeating unit derived from propylene oxide.

[0017] In this embodiment, when the total mass of the visualization agent contained in the ink is taken as 100 mass %, the dispersant contained in the ink is preferably 30 mass % or more and 200 mass % or less.

[0018] In this embodiment, the visualization agent preferably contains at least one selected from the group consisting of orthocresolphthalein, thymol blue, and thymolphthalein. Here, when the total mass of the ink is taken as 100 mass%, the visualization agent contained in the ink is preferably 1 mass% or more and 10 mass% or less.

[0019] The sterilization visualization ink of the present embodiment is an ink for forming a colored portion on the sterilization visualization sheet, and can be applied to the substrate by various methods such as spraying, coating, etc. Among them, by forming the colored portion by the inkjet method, it becomes possible to display a character barcode or the like on demand with high resolution on the colored portion.

[0020] The details of each part of the sterilization visualization sheet will be described later.

[0021] The aqueous ink for producing the sterilization visualization sheet of this embodiment will be described below.

[0022] <Visualization Agent> The visualizing agent in this embodiment is not particularly limited as long as it is poorly soluble in water and changes its color state by reacting with a disinfectant described below. In this embodiment, the change in color state refers to a change in which the difference in color 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 recognized by the naked eye. Examples of the visualizing agent in this embodiment include o-cresolphthalein and thymolphthalein.

[0023] 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.

[0024] The visualization agent may be a combination of a plurality of materials that exhibit different changes in color state.

[0025] 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.

[0026] Among the above, the visualization agent of the present embodiment is one that is poorly soluble in water. In this specification, poorly soluble is defined as having a solubility of 0.1% or less in pure water at 23°C.

[0027] The amount of the visualization agent is preferably 1 to 10% based on the total mass of the ink composition in order to obtain a deep color.

[0028] <Dispersant> The disinfectant visualization ink in this embodiment contains a dispersant for dispersing the visualization agent in water. When the visualization agent is colored by acidichromism, it is preferable that the dispersant has at least one functional group selected from the group consisting of 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 visualization 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 for the visualization agent to continue coloring. In particular, when the visualization agent is thymol blue or orthocresolphthalein (o-cresolphthalein), 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 suitable for the above reasons.

[0029] 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 coloring by the disinfectant.

[0030] 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.

[0031] These dispersants are used in an amount of 30% by mass to 200% by mass when the total mass of the visualization agent is taken as 100% by mass, and are dispersed by a conventionally known method to form ink components.

[0032] <Aqueous liquid> The aqueous ink for producing the sterilization visualization sheet of the present invention is an aqueous ink containing at least water as an aqueous liquid. The ink can contain water or an aqueous liquid that is a mixed solvent of water and a water-soluble organic solvent. As the water, it is preferable to use deionized water or ion-exchanged water.

[0033] The content (mass%) of water in the ink is preferably 50.00% by mass or more and 95.00% by mass or less based on the total mass of the ink. The content (mass%) of water-soluble organic solvent in the ink is preferably 3.00% by mass or more and 50.00% by mass or less based on the total mass of the ink. As the water-soluble organic solvent, any of those usable in inkjet inks, such as alcohols, (poly)alkylene glycols, glycol ethers, nitrogen-containing compounds, and sulfur-containing compounds, can be used.

[0034] (Other additives) In addition to the above-mentioned components, the aqueous ink for producing the sterilization visualization sheet of the present invention 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.

[0035] When the aqueous ink for producing the sterilization visualization sheet of the present invention is discharged from an inkjet recording head to record an image on a recording medium, it is preferable to use one in which the surface tension and viscosity are appropriately controlled. Specifically, 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.

[0036] 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.

[0037] <Image recording method (method of applying water-based ink for manufacturing sterilization visualization sheet)> The image recording method in this embodiment may be a spray method, an inkjet method, or the like. For example, the inkjet method is a method in which the ink of the present invention is ejected from an inkjet recording head to record an image on a recording medium. Methods for ejecting the ink include a method of applying mechanical energy and a method of applying thermal energy to the composition. Other than using the ink of the present invention, known methods may be used for the steps of the inkjet recording method.

[0038] 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.

[0039] 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.

[0040] (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.

[0041] <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.

[0042] 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.

[0043] 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.

[0044] <Base material> The substrate in this embodiment may be any substrate on which a color-developing portion is provided.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] <Holding part> The disinfectant visualization sheet 103 in this embodiment may have a holding section 104 for holding a disinfectant on the coloring section 101 (FIG. 2). The holding section 103 can hold the disinfectant for a long time, and therefore can extend the time for the disinfectant to react with the visualization agent and develop a color. In addition, by appropriately selecting a material for the holding section 103, the coloring time can be controlled. For example, the time it takes for a color to change from a visible color state to an invisible color state can be controlled.

[0051] Because of such a function, the holding unit can also be called a decoloring time control unit.

[0052] The holding part desirably has voids to hold the applied disinfectant. For example, the holding part may be configured to include a plurality of inorganic particles, and voids may be formed between the plurality of inorganic particles. The inorganic particles used here are at least one selected from the group consisting of pearl necklace-shaped silica particles, chain-shaped silica particles, spherical colloidal silica, non-spherical colloidal silica, alumina particles, titania particles, and zirconia particles. The peak position of the particle size distribution of the particle size of the inorganic fine particles by dynamic light scattering method (hereinafter simply referred to as particle size) is preferably 1 nm or more and 300 nm or less, more preferably 1 nm or more and 150 nm or less, and particularly preferably 1 nm or more and 60 nm or less. In particular, the particle size of the pearl necklace-shaped silica particles is preferably 20 nm or more and 50 nm or less. In addition, the particle size of the chain-shaped silica particles is desirably 1 nm or more and 10 nm or less. By setting the particle size to 300 nm or less, the amount of voids can be sufficiently secured, and by setting the particle size to 1 nm or more, the pore diameter of the voids formed by the inorganic particles can be sufficiently large, and the absorption speed of the applied disinfectant can be increased. The pore diameter of the voids is preferably such that the pore diameter distribution curve has a maximum peak in the range of 5 nm to 20 nm. If the pore diameter peak is 5 nm or more, the absorption rate of the disinfectant increases, and if it exceeds 20 nm, the haze may increase. If the haze increases, the whitishness becomes noticeable, so it is desirable that the pore diameter is 20 nm or less in order to reduce the decrease in visibility of the colored part. The pore diameter can be measured by BET specific surface area measurement.

[0053] The resin used here can be selected from various resins, but when the disinfectant is water-based, water-soluble resin is preferred.The water-soluble resin can be at least one selected from the group consisting of cellulose binders such as methyl cellulose, methyl hydroxyethyl cellulose, methyl hydroxypropyl cellulose, and hydroxyethyl cellulose, natural polymer resins or derivatives thereof such as starch and its modified products, gelatin and its modified products, casein, pullulan, gum arabic, karaya gum, and albumin, latexes and emulsions such as SBR latex, NBR latex, methyl methacrylate-butadiene copolymer, and ethylene-vinyl acetate copolymer, vinyl polymers such as polyacrylamide and polyvinylpyrrolidone, polyethyleneimine, polypropylene glycol, polyethylene glycol, and maleic anhydride or its copolymer.

[0054] The thickness of the retaining part does not have to be uniform. For example, the retention time of the disinfectant can be changed by changing the thickness of a part. This allows the coloring time of the color-changing part to be changed, and the time since the disinfectant came into contact can be displayed as an indicator.

[0055] <Protection Department> In this embodiment, a protective part for protecting the colored part may be provided on the colored part. Here, on the colored part, the protective part may be provided so as to be in contact with the colored part, or when the holding part is provided on the colored part, the protective part may be provided on the holding part. For example, when a water-soluble resin is used as the holding part, the surface becomes viscous, so it is preferable to coat it with a protective layer. As the protective part in this embodiment, at least one selected from the group consisting of resins such as acrylic resins, vinyl acetate resins, vinyl chloride resins, ethylene / vinyl acetate copolymer resins, polyamide resins, polyester resins, urethane resins, polyolefin resins, and copolymer resins thereof can be used. In addition, it is preferable that the protective part is configured to allow the disinfectant to pass through sufficiently to cause the visualization agent to be colored.

[0056] The protective part in this embodiment may have a water-resistant material that improves water resistance. As the water-resistant material, a binder that is highly hydrophobic and difficult to hydrolyze can be used instead of a hydrophilic resin, with a reduced amount of the hydrophilic resin. Specific examples of the water-resistant material include acrylic resin, polycarbonate-modified urethane resin, and polyether-modified urethane resin.

[0057] One of these may be used, or a combination of two or more of them may be used.

[0058] The amount of the binder that is not easily hydrolyzed to be used is preferably such that the content of the water-soluble resin relative to the total content of the binder in the ink receiving layer is 20 mass % or less.

[0059] The protective portion in this embodiment may have a weather-resistant material for improving weather resistance. As the weather-resistant material, any of hindered amine-based compounds such as benzophenone-based, benzotriazole-based, and triazine-based compounds, which are ultraviolet absorbents or light stabilizers, can be used.

[0060] Furthermore, the decolorization time control unit is more preferable because it can provide durability by repeatedly wiping the surface of the disinfectant visualization sheet with the disinfectant.

[0061] <Tank> The ink tank according to the present embodiment contains the disinfectant visualization ink according to the present embodiment. EXAMPLES

[0062] 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 deviate from the gist of the invention. Note that, with regard to the amounts of components, "parts" and "%" are based on mass unless otherwise specified.

[0063] Preparation of Example 1 Visualization agent: O-cresolphthalein: 2 parts Dispersant: Dispersant BYK DisperBKY 190: 0.8 parts Ion-exchanged water: 16 parts

[0064] The above was dispersed (Fritsch planetary ball mill, 300 rpm, 4 hours, media: zirconia beads, 0.5 mmΦ, media filling rate: 70%), diluted with a 15% aqueous glycerin solution so that the visualization agent concentration became 5%, stirred with a stirrer for 1 hour, and then filtered through a 0.5 μm filter to obtain ink 1 of this example.

[0065] Examples 2 to 9 were obtained in the same manner, except that the visualization agent, dispersant, and visualization agent concentration were changed as shown in Table 1.

[0066] Furthermore, ink was prepared in the same manner as in Example 1 using thymolphthalein as a visualization agent but without using a dispersant, to obtain ink of Comparative Example 1.

[0067] [Table 1]

[0068] Creation of sterilization visualization sheets 1 to 8 The ink of Example 1 was filled into a yellow cartridge of an inkjet recording device (EP-M553T manufactured by Epson Corporation), and a solid image with 100% yellow duty was created using image processing software (PHOTOSHOP (registered trademark) manufactured by Adobe Systems Incorporated). 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 with a temperature of 23°C and a relative humidity of 55%.

[0069] This is referred to as sterilization visualization sheet 1.

[0070] Sterilization visualization sheets 2 to 9 and a sterilization visualization sheet 10 using the ink of Comparative Example 1 were prepared in the same manner as above, except that the ink was changed to the ink of Example 2.

[0071] <Evaluation> A 0.5 wt% aqueous solution of sodium hypochlorite was used as the disinfectant. 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 white paper and filmed on a videotape. The filmed video was converted into a grayscale of 0 to 255, and the absolute value of the change in value before and after application was measured. Of the following evaluation criteria, "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

[0072] [Table 2]

[0073] The ink according to the embodiment of the present invention makes it possible to visually confirm that the disinfectant has been applied.

[0074] <Evaluation of Examples 2: Inkjet Discharge by Thermal Energy> The ink of Example 1 was filled into an ink cartridge and set in an inkjet recording device (PIXUS iP7230; manufactured by Canon) that ejects ink from a recording head by the action of thermal energy. In this example, 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%.

[0075] No ejection problems occurred, and a uniform solid image could be recorded.

[0076] The present invention is not limited to the above-described embodiments, and various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, the following claims are appended to apprise the public of the scope of the present invention.

[0077] The above disclosure includes the following configurations.

[0078] (Configuration 1) The ink for visualizing a disinfectant comprises: a visualizing agent whose color state changes when a disinfectant is applied and which is poorly soluble in an aqueous liquid; a dispersant which disperses the visualizing agent in the aqueous liquid; and the aqueous liquid.

[0079] (Configuration 2) 2. The disinfectant visualization ink according to claim 1, wherein the dispersant has at least one functional group selected from the group consisting of a polyethylene oxide group, a polypropylene oxide group, and a polyglycerin group.

[0080] (Configuration 3) 3. The disinfectant visualization ink according to claim 1 or 2, wherein the dispersant has a copolymer containing a repeating unit derived from ethylene oxide and a repeating unit derived from propylene oxide.

[0081] (Configuration 4) 4. The disinfectant visualization ink according to any one of Configurations 1 to 3, wherein the dispersant contained in the ink is 30% by mass or more and 200% by mass or less when the total mass of the visualization agent contained in the ink is 100% by mass.

[0082] (Configuration 5) 5. The disinfectant visualizing ink according to any one of claims 1 to 4, wherein the visualizing agent comprises at least one selected from the group consisting of orthocresolphthalein, thymol blue, and thymolphthalein.

[0083] (Configuration 6) 2. The disinfectant visualization ink according to claim 1, wherein the visualization agent contained in the ink is 1% by mass or more and 10% by mass or less, when the total mass of the ink is 100% by mass.

[0084] (Configuration 7) 2. The disinfectant visualization ink according to claim 1, wherein the aqueous liquid comprises water or a mixed solvent of water and a water-soluble organic solvent.

[0085] (Configuration 8) A substrate and a color-changing portion provided on the substrate, The colored portion comprises the visualizing agent according to any one of Configurations 1 to 7.

[0086] (Configuration 9) 9. The disinfectant visualization sheet according to any one of claims 1 to 8, wherein the colored portion has a retaining portion that retains the disinfectant.

[0087] (Configuration 10) 10. The disinfectant-visualizing sheet according to configuration 9, wherein the holding section contains a plurality of inorganic particles, and voids are formed among the plurality of inorganic particles.

[0088] (Configuration 11) 11. The disinfectant-visualizing sheet according to claim 9 or 10, wherein the holding part contains at least one particle selected from the group consisting of pearl-necklace-shaped silica particles, spherical colloidal silica, non-spherical colloidal silica, alumina particles, titania particles, and zirconia particles.

[0089] (Configuration 12) 12. The disinfectant-visualizing sheet according to any one of Configurations 8 to 11, wherein the colored portion comprises a binder.

[0090] (Configuration 13) 13. The disinfectant-visualizing sheet according to any one of Configurations 8 to 12, wherein a protective part is provided on the colored part.

Claims

1. The disinfectant visualization ink comprises a visualization agent whose color state changes when a disinfectant is applied and which is poorly soluble in an aqueous liquid, a dispersant that disperses the visualization agent in the aqueous liquid, and the aqueous liquid.

2. 2. The disinfectant visualization ink according to claim 1, wherein the dispersant has at least one functional group selected from the group consisting of a polyethylene oxide group, a polypropylene oxide group, and a polyglycerin group.

3. 2. The disinfectant visualization ink according to claim 1, wherein the dispersant comprises a copolymer containing a repeating unit derived from ethylene oxide and a repeating unit derived from propylene oxide.

4. 2. The disinfectant visualization ink according to claim 1, wherein the dispersant contained in the ink is 30% by mass or more and 200% by mass or less when the total mass of the visualization agent contained in the ink is 100% by mass.

5. 2. The disinfectant visualization ink according to claim 1, wherein the visualization agent comprises at least one selected from the group consisting of orthocresolphthalein, thymol blue, and thymolphthalein.

6. 2. The disinfectant visualization ink according to claim 1, wherein the visualization agent contained in the ink is 1% by mass or more and 10% by mass or less, when the total mass of the ink is taken as 100% by mass.

7. The disinfectant visualization ink according to claim 1 , wherein the aqueous liquid comprises water or a mixed solvent of water and a water-soluble organic solvent.

8. An ink for visualizing disinfectants as described in Claim 7, wherein when the total mass of the ink is 100 mass%, the water contained in the aqueous solvent is 50.00 mass% or more and 95.00 mass% or less.

9. An ink for visualizing disinfectants as described in claim 1, wherein the visualizing agent comprises a plurality of materials that exhibit different color state changes from each other.

10. An ink for visualizing disinfectants as described in claim 1, wherein the visualizing agent changes color as the disinfectant evaporates and returns to the state it was in before the disinfectant was applied.

11. An ink for visualizing disinfectants as described in claim 1, which has a surface tension of 10 mN / m or more and 60 mN / m or less at 25°C.

12. An ink for visualizing disinfectants as described in claim 1, which has a viscosity at 25°C of 1.0 mPa·s or more and 10 mPa·s or less.

13. a substrate; and a color-changing portion provided on the substrate and having the visualization agent; The disinfectant visualization sheet, wherein the colored portion comprises the visualization agent according to claim 1.

14. The disinfectant visualization sheet according to claim 13 , wherein the colored portion has a holding portion that holds the disinfectant.

15. The disinfectant visualizing sheet according to claim 14, wherein the holding portion contains a plurality of inorganic particles, and voids are formed between the plurality of inorganic particles.

16. 15. The disinfectant visualization sheet according to claim 14, wherein the holding portion contains at least one particle selected from the group consisting of pearl necklace-shaped silica particles, spherical colloidal silica, non-spherical colloidal silica, alumina particles, titania particles, and zirconia particles.

17. A disinfectant visualization sheet as described in Claim 14, characterized in that the holding portion holds the disinfectant and thereby controls the time it takes for the disinfectant to react with the visualization agent and change color.

18. A disinfectant visualization sheet as described in claim 14, wherein the holding portion has voids that hold the disinfectant, and the pore diameter distribution curve of the voids has a maximum peak in the range of 5 nm or more and 20 nm or less.

19. The disinfectant visualization sheet according to claim 13, wherein the colored portion contains a binder.

20. The disinfectant-visualizing sheet according to claim 13, wherein a protective part is provided on the colored part.

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