Cosmetic ink and cosmetic sheet

Abstract

The cosmetic ink is a blue cosmetic ink containing a blue pigment (A), acrylic particles (B), an alcohol solvent (C), and water (D), the content of the blue pigment (A) being 0.5-4.5 mass% with respect to the total amount of the blue pigment (A), the acrylic particles (B), the alcohol solvent (C), and the water (D), and the alcohol solvent (C) including a dihydric alcohol solvent (C1) and a trihydric alcohol solvent (C2). The total content of the dihydric alcohol-based solvent (C1) and the trihydric alcohol-based solvent (C2) is 30% by mass or more and 85% by mass or less with respect to the total amount of the blue pigment (A), the acrylic particles (B), the alcohol-based solvent (C), and the water (D).

Description

Technical Field

[0001] The present invention relates to cosmetic ink (specifically, blue cosmetic ink and white cosmetic ink) and a cosmetic sheet printed with the cosmetic ink. Background Art

[0002] In the past, a technique has been proposed for making spots, moles, scars, etc. formed on the skin (hereinafter sometimes referred to as "discolored areas") less noticeable by applying ink containing various colorants on a sheet and attaching it to a human body (for example, see Patent Document 1). In the technique of Patent Document 1, the skin is photographed to identify the discolored areas. Then, the color of the outer area close to the discolored area is printed on the sheet and attached to the skin, thereby making the discolored area less noticeable.

[0003] However, it is difficult for the cosmetic sheet to reproduce the color of the skin. In particular, if more ink is applied to cover the discolored area, the deviation from the original skin color becomes larger when the cosmetic sheet is attached. Therefore, regarding the ink used for the cosmetic sheet, a cosmetic ink (cosmetic material ink) that can reproduce the original skin color when the cosmetic sheet is attached has been developed. For example, Patent Document 2 describes a cosmetic ink that has high concealing properties for spots and the like and can reproduce a color close to the skin color regardless of the amount of the cosmetic ink applied.

[0004] In addition, regarding the cosmetic ink, an inkjet printing ink has been developed that has high biological safety, can be stably ejected from an inkjet printer, and produces an image with high durability (see, for example, Patent Document 3).

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Publication No. 2015-43836

[0008] Patent Document 2: International Patent Publication No. 2019 / 073743

[0009] Patent Document 3: Japanese Patent Publication No. 2017-57261 Summary of the invention

[0010] Therefore, an object of the present invention is to provide a cosmetic ink that can be suitably used as a cosmetic ink and has excellent discharge stability in inkjet printing.

[0011] The present inventors have conducted intensive research to solve the above-mentioned problems and have completed the present invention. That is, the present invention includes the following preferred technical solutions.

[0012] The cosmetic ink involved in the first aspect of the present invention is blue cosmetic ink, and comprises:

[0013] Blue pigment (A);

[0014] Acrylic particles (B);

[0015] an alcohol solvent (C); and

[0016] Water (D), where

[0017] The content of the blue pigment (A) is 0.5% by mass or more and 4.5% by mass or less relative to the total amount of the blue pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D),

[0018] The alcohol solvent (C) comprises a divalent alcohol solvent (C1) and a trivalent alcohol solvent (C2).

[0019] The total content of the above-mentioned divalent alcohol solvent (C1) and the above-mentioned trivalent alcohol solvent (C2) is 30% by mass or more and 85% by mass or less relative to the total amount of the above-mentioned blue pigment (A), the above-mentioned acrylic particles (B), the above-mentioned alcohol solvent (C) and the above-mentioned water (D).

[0020] Alternatively, another cosmetic ink according to the first aspect of the present invention is white cosmetic ink, and comprises:

[0021] White pigment (A);

[0022] Acrylic particles (B);

[0023] an alcohol solvent (C); and

[0024] Water (D), where

[0025] The median diameter of the white pigment (A) is 300 nm or more and 900 nm or less,

[0026] The content of the white pigment (A) is 4% by mass or more and 35% by mass or less relative to the total amount of the white pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D),

[0027] The alcohol solvent (C) comprises a divalent alcohol solvent (C1) and a trivalent alcohol solvent (C2).

[0028] The total content of the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) is 17% by mass or more and 55% by mass or less relative to the total amount of the white pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D).

[0029] The cosmetic sheet according to the second aspect of the present invention comprises:

[0030] A sheet having a thickness of 10 nm or more and 3000 nm or less; and

[0031] The coating film is formed on the sheet and has at least an ink layer formed from the cosmetic ink according to the first aspect or another cosmetic ink according to the first aspect. DETAILED DESCRIPTION

[0032] As described above, cosmetic inks and cosmetic inks for inkjet printing having various properties have been developed in recent years. On the other hand, when, for example, masking a discolored area and / or expressing skin color, multi-color cosmetic inks are often mixed in a sheet or applied to a sheet for use. Therefore, it is desirable to further improve various properties of the cosmetic ink for each color of the cosmetic ink.

[0033] The present inventors have conducted intensive research and found that by setting the content (mass %) of the blue pigment contained in the blue cosmetic ink within a specified range, the blue cosmetic ink can be suitably used to express skin color. In addition, it is also found that by setting the median diameter and content (mass %) of the white pigment contained in the white cosmetic ink within a specified range, a cosmetic sheet produced using the white cosmetic ink has good hiding power for the color change area and excellent ejection stability in inkjet printing.

[0034] It is also known that: by making the alcohol solvent contained in blue or white cosmetic ink (sometimes referred to as "blue cosmetic ink or white cosmetic ink" or simply "cosmetic ink") contain both a divalent alcohol solvent and a trivalent alcohol solvent, and setting the total content (mass %) of the divalent alcohol solvent and the trivalent alcohol solvent within a specified range, the cosmetic ink can exhibit excellent ejection stability in inkjet printing.

[0035] As described above, the cosmetic ink of the present embodiment can be suitably used as a cosmetic ink and has excellent discharge stability in inkjet printing.

[0036] More specifically, according to this embodiment, a blue cosmetic ink that is suitable for expressing skin color and has excellent ejection stability in inkjet printing can be provided. Alternatively, according to this embodiment, a white cosmetic ink that has good shielding properties for a discolored area and has excellent ejection stability in inkjet printing can be provided.

[0037] In this specification, the “coating film” formed on a printed object (e.g., a sheet) includes not only a coating film having only an ink layer formed of blue or white cosmetic ink, but also a coating film having an ink layer formed of blue or white cosmetic ink and one or more ink layers formed of cosmetic ink of other colors in a stacked state.

[0038] In this specification, "a coating film having a spectral reflectance that can be distinguished from skin color (sensually)" means: a coating film formed using a blue or white cosmetic ink and a cosmetic ink of another color, and a coating film in which a curve obtained by measuring the spectral reflectance of the coating film at a wavelength of 400nm to 700nm satisfies all of the following requirements (i) to (iv) (see Patent Document 2).

[0039] (i) There is a first inflection point in the region shorter than a wavelength of 550 nm.

[0040] (ii) A second inflection point exists in the region between a wavelength of 550 nm and a wavelength of 610 nm.

[0041] (iii) The spectral reflectance at the second inflection point is higher than the spectral reflectance at the first inflection point.

[0042] (iv) The spectral reflectance in the region with a wavelength exceeding 580 nm is higher than the spectral reflectance at a wavelength of 580 nm.

[0043] In addition, in this specification, "expressing skin color" or "having skin color expression" means that a coating film formed using cosmetic ink has a spectral reflectance that can be sensoryly distinguished from skin color, or when the skin color expression of cosmetic ink is evaluated by the method described in the Examples below, the coating film is judged to have appropriate skin color expression. Specifically, the latter refers to the following: the L of the coating film formed using blue cosmetic ink, red cosmetic ink, and yellow cosmetic ink is measured using a spectrophotometer. * a * b * L of the color system * Value, a * Value and b * When the value is * Value, a * Value and b * The color difference of the measured value ΔE *ab is less than 13.0.

[0044] Alternatively, in this specification, "expressing skin color" means that a coating film formed using cosmetic ink has a spectral reflectance that can be sensorily distinguished from skin color, or a coating film formed using cosmetic ink satisfies the following L * Value, a * Value and b * Value condition.

[0045] (L * Value, a * Value and b * Value condition)

[0046] The L values ​​of the coating films formed using the white cosmetic ink and the cosmetic inks of other colors were measured using a spectrophotometer (e.g., "CM-700d" manufactured by Konica Minolta Inc.). * a * b * L of the color system * Value, a * Value and b * When the measured value is L, the measured value is consistent with the L of the skin model (e.g., biological skin (Beaulax, product number BIO)). * Value, a * Value and b * The color difference of the measured value ΔE * ab is less than 13.0.

[0047] The following is a detailed description of the embodiments of the present invention. It should be noted that the scope of the present invention is not limited to the embodiments described here, and various modifications can be made within the scope that does not impair the gist of the present invention.

[0048] 1. Cosmetic ink (blue cosmetic ink or white cosmetic ink)

[0049] The cosmetic ink in this embodiment, i.e., the blue cosmetic ink or the white cosmetic ink, has excellent ejection stability in inkjet printing. Therefore, the cosmetic ink can be used as an inkjet printing ink and printed on a printed object. Specifically, the blue or white cosmetic ink is preferably an inkjet printing ink for inkjet printing on a sheet having a thickness of 10 nm or more and 3000 nm or less. Such a sheet as a printed object will be described in detail later.

[0050] Then, as described in detail below, a coating film having an ink layer formed of a blue or white cosmetic ink is formed on the sheet by, for example, inkjet printing, thereby producing a cosmetic sheet. Alternatively, a coating film having an ink layer formed of a blue or white cosmetic ink and one or more ink layers formed of cosmetic inks of other colors may be formed on the sheet, thereby producing a cosmetic sheet.

[0051] 1-1. Blue cosmetic ink

[0052] First, the blue cosmetic ink among the cosmetic inks in the present embodiment will be described in detail below.

[0053] 1-1-1. Components of blue cosmetic ink

[0054] The blue cosmetic ink in this embodiment includes a blue pigment (A), acrylic particles (B), an alcohol solvent (C) and water (D). In addition, the blue cosmetic ink may include other components as needed. Each component is described in detail below.

[0055] <Blue Pigment (A)>

[0056] The blue pigment (A) contained in the blue cosmetic ink is not particularly limited as long as it is a pigment that can display blue, but from the viewpoint of skin irritation, it is preferably selected from the ingredients listed in the list of cosmetic ingredient labels based on the Japanese Pharmaceutical Affairs Law, the ingredients in accordance with EU cosmetic regulations (Cosmetics Directive 76 / 768 / EEC), and the International Cosmetic Ingredient Dictionary and Handbook (January 1, 2002, 9th edition) of the CTFA (Cosmetic, Toiletry & Fragrance Association, US). Specifically, the blue pigment (A) can be any inorganic pigment and organic pigment used in any cosmetics known to those skilled in the art, but inorganic pigments are preferred from the viewpoint that they can be used appropriately and do not have adverse effects on the skin.

[0057] Specifically, as the inorganic pigment, the blue pigment (A) preferably contains at least one selected from Prussian blue (ferric ferrocyanide), ultramarine blue, lapis lazuli, blue verditer, aluminum-cobalt oxide, aluminum-zinc-cobalt oxide, silicon-cobalt oxide, silicon-zinc-cobalt oxide, cobalt pigment, smalt, cobalt blue, cobalt stannate, cobalt chrome blue, cobalt-aluminum-silicon oxide and manganese blue.

[0058] Among these, the blue pigment (A) more preferably contains Prussian blue (ferric ferrocyanide) from the viewpoint of color development, safety and biocompatibility as a cosmetic material.

[0059] The content of the blue pigment (A) is 0.5% by mass or more and 4.5% by mass or less based on the total amount of the blue pigment (A), the acrylic particles (B), the alcohol solvent (C) and water (D).

[0060] If the content of the blue pigment (A) is less than 0.5% by mass, it is difficult to impart a blue color derived from the pigment to the printed object, and it is difficult to express skin color when used together with other colored cosmetic inks. On the other hand, if the content of the blue pigment (A) exceeds 4.5% by mass, an excessive amount of blue derived from the pigment is imparted to the printed object, and it is difficult to express skin color when used together with other colored cosmetic inks.

[0061] The content of blue pigment (A) is preferably 0.52% by mass or more, more preferably 1% by mass or more, and further preferably 2% by mass or more. In addition, the content of blue pigment (A) is preferably 4.15% by mass or less, more preferably 4% by mass or less, and further preferably 3% by mass or less.

[0062] The median diameter (median value (D50) of the cumulative value in the particle size distribution) of the blue pigment (A) measured by the laser diffraction method is preferably greater than 90 nm and less than 500 nm. By making the median diameter of the blue pigment (A) greater than 90 nm, it is easy to impart the blue color derived from the pigment to the printed body, and it is easy to use it with other colors of cosmetic inks to express the skin color. In addition, by making the median diameter of the blue pigment (A) less than 500 nm, it is easy to prevent the printed body from excessively showing the blue color derived from the pigment, and it is easy to use it with other colors of cosmetic inks to express the skin color. In addition, by setting the median diameter of the blue pigment (A) to this range, the blue cosmetic ink can also be stably ejected from the inkjet printer.

[0063] The median diameter of the blue pigment (A) is more preferably 95 nm or more, and even more preferably 100 nm or more. In addition, the median diameter of the blue pigment (A) is more preferably 400 nm or less, and even more preferably 250 nm or less.

[0064] <Acrylic Particles (B)>

[0065] The blue cosmetic ink in this embodiment contains acrylic particles (B). The acrylic particles (B) make the blue cosmetic ink adhere to the printed object and improve the water resistance and durability of the printed material.

[0066] The acrylic particles (B) are not particularly limited as long as they are particles formed of a (meth) acrylic resin having the above-mentioned effects, and examples thereof include (meth) acrylic acid alkyl ester polymers, styrene-(meth) acrylic acid copolymers, (meth) acrylic acid alkyl ester-vinyl acetate copolymers, (meth) acrylic acid-(meth) acrylic acid alkyl ester copolymers, (meth) acrylic acid alkyl ester polydimethylsiloxane polymers, etc. In the present specification, (meth) acrylic acid means acrylic acid, methacrylic acid, or a mixture of acrylic acid and methacrylic acid.

[0067] The acrylic particles (B) are preferably particles formed of a (meth) acrylic resin that is non-irritating to the skin. Therefore, the acrylic particles (B) are preferably selected from the ingredients listed in the list of ingredient labels of cosmetics based on the Japanese Pharmaceutical Affairs Law, the ingredients in accordance with the EU Cosmetics Regulation (Cosmetics Directive 76 / 768 / EEC), and the ingredients recorded in the International Cosmetic Ingredients Dictionary and Handbook (January 1, 2002, 9th edition) of the American CTFA (Cosmetic Fragrance Association). Specifically, it is more preferable to select any particles formed of a (meth) acrylic resin known to those skilled in the art for use in cosmetics, etc.

[0068] As a specific example, the acrylic particles (B) include a homopolymer of a (meth)acrylic monomer, a copolymer of two or more (meth)acrylic monomers, a copolymer of a (meth)acrylic monomer and other monomers, and the like.

[0069] Among these, the acrylic particles (B) preferably contain at least one of a homopolymer of a (meth)acrylic monomer and a copolymer of two or more (meth)acrylic monomers. Furthermore, the acrylic particles (B) more preferably contain an acrylic (ester) copolymer. An acrylic (ester) copolymer is a copolymer formed from two or more monomers selected from acrylic acid, methacrylic acid, and simple esters thereof.

[0070] The above-mentioned (meth)acrylic monomers include, for example, acrylic acid, methyl acrylate, ethyl acrylate, acrylamide, n-propyl acrylate, n-butyl acrylate, isobutyl acrylate, octyl acrylate, 2-ethylhexyl acrylate, N,N-dimethylaminoethyl acrylate, acrylonitrile, methacrylic acid, ethyl methacrylate, methacrylamide, n-propyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, octyl methacrylate, hydroxyethyl methacrylate, N,N-dimethylaminoethyl methacrylate, and the like.

[0071] Examples of other monomers copolymerizable with the (meth)acrylic monomer include styrene, vinyl acetate, silicone macromonomers, fluorine-based monomers, and alkoxysilane unsaturated monomers.

[0072] The content of the acrylic particles (B) is not particularly limited, but is preferably 1% by mass or more and 20% by mass or less based on the total amount of the blue pigment (A), the acrylic particles (B), the alcohol solvent (C) and water (D).

[0073] By setting the content of the acrylic particles (B) within this range, a good adhesiveness (water resistance) effect of the blue cosmetic ink can be ensured.

[0074] The content of the acrylic particles (B) is more preferably 1.5% by mass or more, and still more preferably 2% by mass or more. The content of the acrylic particles (B) is more preferably 15% by mass or less, and still more preferably 10% by mass or less.

[0075] The median diameter of the acrylic particles (B) is preferably greater than 1 nm and less than 150 nm. It should be noted that the median diameter of the acrylic particles (B) refers to the median value (D50) of the cumulative value in the particle size distribution measured by the laser diffraction method. Furthermore, it is further preferred that the value (D90) of 90% of the cumulative value in the particle size distribution of the acrylic particles (B) is less than 250 nm. By setting the particle size of the acrylic particles (B) to this range, the adhesion (water resistance) of the blue cosmetic ink can be made better, and the blue cosmetic ink can be ejected more stably from the inkjet printer.

[0076] When preparing a blue cosmetic ink, acrylic particles (B) are usually dispersed in a dispersion medium (in the form of a slurry or a dispersion liquid) and mixed with a blue pigment (A), an alcohol solvent (C), water (D), etc. The dispersion medium at this time is preferably a solvent that does not irritate the skin, and is preferably an alcohol solvent (C) or water (D) described below.

[0077] <Alcohol solvent (C)>

[0078] The blue cosmetic ink in this embodiment contains an alcohol solvent (C). The alcohol solvent (C) has the function of a moisturizing material (anti-drying agent) and a solvent for the blue cosmetic ink. Specifically, when the blue cosmetic ink is used for inkjet printing, the alcohol solvent (C) prevents the drying of the area around the inkjet printer nozzle and suppresses clogging of the holes caused by adhesion of the ink.

[0079] The alcohol solvent (C) is not particularly limited as long as it is a higher alcohol having 3 or more carbon atoms and being able to perform the above functions, but preferably one without skin irritation. It should be noted that the alcohol solvent (C) is absorbed into the printed object or volatilized after printing the blue cosmetic ink on the printed object.

[0080] The number of carbon atoms in the alcoholic solvent (C) is preferably 3 to 5, and more preferably 3 or 4. When the number of carbon atoms in the alcoholic solvent (C) is within this range, it is easily compatible with water (D) described later.

[0081] In addition, the alcohol solvent (C) preferably contains an alcohol solvent having a boiling point of 200° C. or higher. By containing an alcohol solvent (C) having a boiling point of 200° C. or higher, the moisturizing effect can be further improved, and the drying of the inkjet printer nozzle periphery can be more reliably prevented. In addition, in this case, it is more preferred that both the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) described later contain an alcohol solvent having a boiling point of 200° C. or higher.

[0082] Furthermore, the blue cosmetic ink in the present embodiment contains both a divalent alcohol solvent (C1) and a trivalent alcohol solvent (C2) as the alcohol solvent (C).

[0083] By including both the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2), the blue cosmetic ink can be stably ejected from the inkjet printer. In other words, when the alcohol solvent (C) includes only one of the trivalent alcohol solvent (C1) and the trivalent alcohol solvent (C2), ejection defects such as ejection deflection may occur during inkjet printing.

[0084] By making the alcohol solvent (C) contain a divalent alcohol solvent (C1), the viscosity and surface tension of the blue cosmetic ink can be prevented from being excessively increased, and the ink can be stably ejected from the inkjet printer. In addition, the wettability of the blue cosmetic ink to the printed object can be improved, and the coating film finally formed is less likely to have spots.

[0085] The divalent alcohol solvent (C1) preferably contains at least one selected from diethylene glycol, propylene glycol, 1,3-propanediol, butylene glycol and hexylene glycol. Among these, 1,3-propanediol is more preferred from the viewpoint of suppressing aggregation of the blue pigment.

[0086] By making the alcohol solvent (C) contain a trivalent alcohol solvent (C2), the alcohol solvent (C) and / or water (D) described later can be made less likely to volatilize, and the viscosity of the blue cosmetic ink can be stably maintained within a range suitable for inkjet printing. As a result, the ink can be stably ejected from the inkjet printer.

[0087] From the viewpoint of high biological safety, the trivalent alcohol solvent (C2) is preferably glycerol. Furthermore, when glycerol is included as the trivalent alcohol solvent (C2), pigment aggregation is less likely to occur, and the ink can be stored for a long time without excessive thickening.

[0088] The total content of the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) is 30% by mass or more and 85% by mass or less relative to the total amount of the blue pigment (A), the acrylic particles (B), the alcohol solvent (C) and water (D).

[0089] When the total content of the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) is within this range, the viscosity of the blue cosmetic ink can be stably maintained within a range suitable for inkjet printing. When the viscosity of the blue cosmetic ink is within a range suitable for inkjet printing, the shape of the flying droplets after the ink is ejected can be made more stable, the shape of the droplets landing on the printed object can be made more uniform, and the ink ejection distortion can be prevented.

[0090] Furthermore, when the total content of the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) is within this range, the area around the nozzle of the inkjet printer can be well moisturized. As a result, the blue cosmetic ink can be stably ejected from the inkjet printer without nozzle clogging and print-through due to drying. Specifically, when the total content of the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) exceeds 85% by mass, it is easy to cause pigment aggregation and nozzle clogging, resulting in the inability to eject the ink.

[0091] The total content of the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) is preferably 35% by mass or more, more preferably 37% by mass or more, and further preferably 40% by mass or more. In addition, the total content of the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) is preferably 80% by mass or less, more preferably 65% ​​by mass or less, and further preferably 50% by mass or less. That is, the total content of the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) is particularly preferably 40% by mass or more and 50% by mass or less.

[0092] The content of the divalent alcohol solvent (C1) is preferably 15% by mass or more and 45% by mass or less relative to the total amount of the blue pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D). By setting the content of the divalent alcohol solvent (C1) to this range, the viscosity of the blue cosmetic ink can be stably maintained within a range suitable for inkjet printing, and the area around the nozzle of the inkjet printer can be more well moisturized. As a result, a blue cosmetic ink with better ejection stability in inkjet printing can be obtained.

[0093] The content of the divalent alcohol solvent (C1) is more preferably 17% by mass or more, and further preferably 20% by mass or more. In addition, the content of the divalent alcohol solvent (C1) is more preferably 42% by mass or less, and further preferably 30% by mass or less. That is, the content of the divalent alcohol solvent (C1) is particularly preferably 20% by mass or more and 30% by mass or less.

[0094] In addition, the content of the trivalent alcohol solvent (C2) is preferably 15% by mass or more and 45% by mass or less relative to the total amount of the blue pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D). By setting the content of the trivalent alcohol solvent (C2) to this range, the viscosity of the blue cosmetic ink can be easily stably maintained in a range suitable for inkjet printing, and the area around the nozzle of the inkjet printer can be easily moisturized. As a result, a blue cosmetic ink with better ejection stability in inkjet printing can be obtained.

[0095] The content of the trivalent alcohol solvent (C2) is more preferably 17% by mass or more, and further preferably 20% by mass or more. In addition, the content of the trivalent alcohol solvent (C2) is more preferably 42% by mass or less, and further preferably 30% by mass or less. That is, the content of the trivalent alcohol solvent (C2) is particularly preferably 20% by mass or more and 30% by mass or less.

[0096] <Water(D)>

[0097] The blue cosmetic ink in this embodiment contains water (D), preferably purified water. The water (D) functions as a solvent for the blue cosmetic ink. After the blue cosmetic ink is printed on the printed object, the water (D) is absorbed into the printed object or evaporates.

[0098] Water (D) is not particularly limited as long as it is water commonly used in cosmetics. For example, water (D) may be pure water purified by various methods such as distillation and ion exchange. For example, water (D) may include hot spring water, deep water, plant steam distilled water, etc.

[0099] The content of water (D) is preferably 10% by mass or more and 60% by mass or less, more preferably 50% by mass or more and 60% by mass or less, and further preferably 50% by mass or more and 56% by mass or less, relative to the total amount of the blue pigment (A), the acrylic particles (B), the alcohol solvent (C), and the water (D). By setting the content of water (D) within this range, the viscosity of the blue cosmetic ink can be easily adjusted to fall within a range suitable for inkjet printing.

[0100] <Other ingredients>

[0101] The blue cosmetic ink may further contain various additives and the like within a range that does not impair the skin color expression properties of the blue cosmetic ink of the present embodiment and the effects of discharge stability in inkjet printing.

[0102] For example, the blue cosmetic ink may include a surfactant as an additive. When a surfactant is included as an additive, the surfactant helps the pigment in the ink to be stably dispersed, thereby better suppressing the aggregation and sedimentation of the blue pigment. The type of surfactant is not particularly limited, but, from the viewpoint of being able to suppress the aggregation of the blue pigment caused by static electricity, a nonionic surfactant or an anionic surfactant is preferably used. As the surfactant, for example, a phosphoric acid surfactant, a phosphate, a sucrose surfactant, a carboxylate, etc. can be cited.

[0103] The additive is preferably a compound that is non-irritating to the skin. Examples of other additives include pH adjusters, thickeners, ultraviolet absorbers, ultraviolet scatterers, preservatives and mildew inhibitors, deoxidizers, antioxidants, preservatives, anti-fading agents, defoamers, fragrances, and solvents other than alcohol solvents (C) and water (D).

[0104] 1-1-2. Preparation method of blue cosmetic ink

[0105] The blue cosmetic ink in this embodiment can be prepared by mixing a slurry or dispersion containing a blue pigment (A), acrylic particles (B), an alcohol solvent (C) and water (D) and other components as required using a disperser. The components can be mixed using any mixing method known to those skilled in the art. For example, a ball mill, a sand mill, a roller mill, a homogenizer, an attritor, etc. can be used for mixing.

[0106] 1-1-3. Physical properties of blue cosmetic ink

[0107] The viscosity of the blue cosmetic ink in this embodiment is preferably 3 mPa·s or more and 15 mPa·s or less at 25°C when measured by a cone-plate viscometer at a shear rate of 1000 (1 / s). By setting the viscosity of the blue cosmetic ink to be within this range, the blue cosmetic ink can be ejected more stably from the inkjet printer. Specifically, the shape of the flying droplets after the ink is ejected can be made more stable, the shape of the droplets landing on the printed object can be made more uniform, and the ink ejection distortion can be prevented.

[0108] The viscosity of the blue cosmetic ink when measured under the same conditions as above is more preferably 3.5 mPa·s or more, and more preferably 4 mPa·s or more. In addition, the viscosity of the blue cosmetic ink when measured under the same conditions as above is more preferably 10 mPa·s or less, and more preferably 6 mPa·s or less.

[0109] The pH of the blue cosmetic ink is preferably 7 to 10. By setting the pH of the blue cosmetic ink within this range, it is possible to suppress the blue cosmetic ink from corroding components such as nozzles of various printing devices. Furthermore, if the pH of the blue cosmetic ink is within this range, pigment aggregation is unlikely to occur even when the blue cosmetic ink is stored for a long time, so that it can be stably ejected from an inkjet printer.

[0110] The surface tension of the blue cosmetic ink at 25°C is more preferably 30 mN / m or more and 40 mN / m or less. When the surface tension of the blue cosmetic ink at 25°C is within this range, the wettability of the blue cosmetic ink becomes good, so when the blue cosmetic ink is ejected from the inkjet printer onto the printed object, a coating film with uniform thickness can be formed. It should be noted that in this specification, the surface tension is a value measured by the pendant drop method.

[0111] In addition, the median diameter of the particles contained in the blue cosmetic ink measured by the laser diffraction method (median value of the cumulative value in the particle size distribution (D50)) is preferably 1 nm or more and 200 nm or less. Moreover, the 90% value (D90) of the cumulative value in the particle size distribution of the particles contained in the blue cosmetic ink is preferably 250 nm or less. By setting the D50 of the particles contained in the blue cosmetic ink, or preferably setting the D50 and D90 to this range, the blue cosmetic ink can be ejected more stably from the inkjet printer.

[0112] The D50 of the particles contained in the blue cosmetic ink is more preferably from 1 nm to 180 nm, and even more preferably from 1 nm to 150 nm.

[0113] In addition, the blue cosmetic ink in the present embodiment preferably has negative skin irritation, i.e., high biosafety. By making the blue cosmetic ink have negative skin irritation, it can be better used for applications that come into contact with the skin, etc. Here, in this specification, "negative skin irritation" means that when a three-dimensional skin model is used as an alternative method for skin irritation testing, the survival rate of cells exceeds 50%. In the alternative method for the skin irritation test, a 5% sodium dodecyl sulfate (SDS) solution is used as an irritation control and a phosphate buffered saline (PBS) is used as a negative control. In addition, after the object ink is exposed to the three-dimensional skin model for 18 hours, the survival rate of the cells is evaluated by the MTT test.

[0114] As an example of a method for making the skin irritation of the blue cosmetic ink negative, there is a method in which all the ingredients contained in the blue cosmetic ink are ingredients listed in the list of ingredient labels of cosmetics based on the Japanese Pharmaceutical Affairs Law, ingredients compliant with the EU Cosmetics Regulation (Cosmetics Directive 76 / 768 / EEC), and ingredients listed in the International Cosmetic Ingredients Dictionary and Handbook (January 1, 2002, 9th edition) of the U.S. CTFA (Cosmetic Fragrance Association).

[0115] 1-2. White cosmetic ink

[0116] Next, the white cosmetic ink among the cosmetic inks in the present embodiment will be described in detail below.

[0117] 1-2-1. Components of white cosmetic ink

[0118] The white cosmetic ink in this embodiment includes a white pigment (A), acrylic particles (B), an alcohol solvent (C) and water (D). In addition, the white cosmetic ink may include other components as needed. Each component is described in detail below.

[0119] <White Pigment (A)>

[0120] The white pigment (A) contained in the white cosmetic ink is not particularly limited as long as it can display white color. However, from the viewpoint of skin irritation, it is preferably a pigment selected from the list of ingredients listed in the cosmetic ingredient labeling name based on the Japanese Pharmaceutical Affairs Law, ingredients in accordance with the EU Cosmetics Regulation (Cosmetics Directive 76 / 768 / EEC), and ingredients listed in the International Cosmetic Ingredient Dictionary and Handbook (January 1, 2002, 9th edition) of the Cosmetic Fragrance Association (CTFA) of the United States. Specifically, the white pigment (A) may be any inorganic pigment or organic pigment used in any cosmetics, etc., which is known to those skilled in the art. However, from the viewpoint of being able to be used appropriately and not causing adverse effects on the skin, inorganic pigments are preferred.

[0121] Specifically, as the inorganic pigment, the white pigment (A) preferably contains at least one selected from titanium oxide, zinc oxide, cerium oxide, barium sulfate, talc, muscovite, phlogopite, red mica, biotite, synthetic mica, sericite, synthetic sericite, kaolin, silicon carbide, bentonite, smectite, silicic anhydride, aluminum oxide, magnesium oxide, zirconium oxide, antimony oxide, diatomaceous earth, aluminum silicate, magnesium aluminum metasilicate, calcium silicate, barium silicate, magnesium silicate, calcium carbonate, magnesium carbonate, hydroxyapatite and boron nitride.

[0122] Among these, the white pigment (A) more preferably contains titanium oxide from the viewpoints of water dispersion stability and color development, safety, and biocompatibility as a cosmetic material.

[0123] The content of the white pigment (A) is 4% by mass or more and 35% by mass or less based on the total amount of the white pigment (A), the acrylic particles (B), the alcohol solvent (C) and water (D).

[0124] If the content of the white pigment (A) is less than 4% by mass, it is difficult to well mask the discolored area with a cosmetic sheet produced using the white cosmetic ink. If the content of the white pigment (A) exceeds 35% by mass, it is difficult to stably eject the white cosmetic ink from an inkjet printer.

[0125] The content of white pigment (A) is preferably more than 5% by mass, more preferably more than 7% by mass, and further preferably more than 10% by mass. In addition, the content of white pigment (A) is preferably below 30% by mass, more preferably below 20% by mass, and further preferably below 15% by mass.

[0126] The median diameter (median value (D50) of the cumulative value in the particle size distribution) of the white pigment (A) measured by laser diffraction method is 300 nm or more and 900 nm or less. If the median diameter of the white pigment (A) is less than 300 nm, it is difficult to shield the discolored area, etc. by a cosmetic sheet made using the white cosmetic ink. In addition, if the content of the white pigment (A) exceeds 900 nm, it is difficult to stably eject the white cosmetic ink from an inkjet printer.

[0127] The median diameter of the white pigment (A) is preferably 310 nm or more, more preferably 320 nm or more, and further preferably 340 nm or more. In addition, the median diameter of the white pigment (A) is preferably 881 nm or less, more preferably 600 nm or less, and further preferably 500 nm or less.

[0128] <Acrylic Particles (B)>

[0129] The white cosmetic ink of the present embodiment contains acrylic particles (B). The acrylic particles (B) make the white cosmetic ink adhere to the printed object, thereby improving the water resistance and durability of the printed object.

[0130] The acrylic particles (B) are not particularly limited as long as they are particles made of a (meth)acrylic resin having the above-mentioned functions. Specific examples of the acrylic particles (B) are the same as those in the above-mentioned blue cosmetic ink.

[0131] The content of the acrylic particles (B) is preferably 3% by mass or more, more preferably 3% by mass or more and 20% by mass or less, based on the total amount of the white pigment (A), the acrylic particles (B), the alcohol solvent (C) and water (D).

[0132] By setting the content of the acrylic particles (B) to 3% by mass or more, preferably 3% by mass or more and 20% by mass or less, not only can the shielding property of the white cosmetic ink and the ejection stability in inkjet printing be improved, but also the printed material of the white cosmetic ink can obtain an excellent adhesion (water resistance) effect.

[0133] The content of the acrylic particles (B) is more preferably 4% by mass or more, and still more preferably 6% by mass or more. The content of the acrylic particles (B) is more preferably 15% by mass or less, and still more preferably 10% by mass or less.

[0134] The preferred range of the median diameter of the acrylic particles (B) and the effects obtained by setting the median diameter within the range are the same as those in the above-mentioned blue cosmetic ink.

[0135] When preparing a white cosmetic ink, acrylic particles (B) are usually dispersed in a dispersion medium (in the form of a slurry or a dispersion liquid) and mixed with a white pigment (A), an alcohol solvent (C), water (D), etc. The dispersion medium in this case is preferably a solvent that does not irritate the skin, and is preferably an alcohol solvent (C) or water (D) described below.

[0136] <Alcohol solvent (C)>

[0137] The white cosmetic ink of the present embodiment contains an alcohol solvent (C). The function of the alcohol solvent (C) is the same as that of the above-mentioned blue cosmetic ink.

[0138] The preferred range of the number of carbon atoms in the alcohol-based solvent (C), the effects brought about by setting the range, and the preferred properties of the alcohol-based solvent (C) are the same as those in the above-mentioned blue cosmetic ink.

[0139] In addition, the preferred lower limit of the boiling point of the alcohol solvent (C) (or the boiling points of both the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2)) and the effect brought about by setting the lower limit are also the same as those in the above-mentioned blue cosmetic ink.

[0140] The white cosmetic ink of this embodiment also contains both a divalent alcohol solvent (C1) and a trivalent alcohol solvent (C2) as alcohol solvents (C). The effects of containing both are the same as those of the above-mentioned blue cosmetic ink.

[0141] The effects of the alcohol solvent (C) containing the divalent alcohol solvent (C1), preferred specific examples of the divalent alcohol solvent (C1), and the preferred effects thereof are the same as those of the above-mentioned blue cosmetic ink.

[0142] The effects of the alcohol solvent (C) containing the trivalent alcohol solvent (C2), preferred specific examples of the trivalent alcohol solvent (C2), and the preferred effects thereof are the same as those of the above-mentioned blue cosmetic ink.

[0143] The total content of the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) is 17% by mass or more and 55% by mass or less relative to the total amount of the white pigment (A), the acrylic particles (B), the alcohol solvent (C) and water (D).

[0144] When the total content of the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) is within this range, the viscosity of the white cosmetic ink can be stably maintained within a range suitable for inkjet printing. When the viscosity of the white cosmetic ink is within a range suitable for inkjet printing, the shape of the flying droplets after the ink is ejected can be made more stable, the shape of the droplets landing on the printed object can be made more uniform, and the ink ejection distortion can be prevented.

[0145] In addition, when the total content of the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) is within this range, the area around the nozzle of the inkjet printer can be well moisturized. As a result, the white cosmetic ink can be stably ejected from the inkjet printer without nozzle clogging and print-through due to drying. Specifically, if the total content of the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) exceeds 55% by mass, it is easy to cause pigment aggregation and nozzle clogging, resulting in the inability to eject the ink.

[0146] The total content of the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) is preferably 18% by mass or more, more preferably 20% by mass or more. In addition, the total content of the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) is preferably 50% by mass or less, more preferably 40% by mass or less, and further preferably 30% by mass or less.

[0147] The content of the divalent alcohol solvent (C1) is preferably 10% by mass or more and 40% by mass or less relative to the total amount of the white pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D). By setting the content of the divalent alcohol solvent (C1) to this range, the viscosity of the white cosmetic ink can be stably maintained in a range suitable for inkjet printing and the area around the nozzle of the inkjet printer can be more well moisturized. As a result, a white cosmetic ink with better ejection stability in inkjet printing can be obtained.

[0148] The content of the divalent alcohol solvent (C1) is more preferably 40% by mass or less, and even more preferably 20% by mass or less.

[0149] In addition, the content of the trivalent alcohol solvent (C2) is preferably 7% by mass or more and 45% by mass or less relative to the total amount of the white pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D). By setting the content of the trivalent alcohol solvent (C2) to this range, the viscosity of the white cosmetic ink can be easily and stably maintained in a range suitable for inkjet printing and the area around the nozzle of the inkjet printer can be more well moisturized. As a result, a white cosmetic ink with better ejection stability in inkjet printing can be obtained.

[0150] The content of the trivalent alcohol solvent (C2) is more preferably 8% by mass or more, and even more preferably 10% by mass or more. In addition, the content of the trivalent alcohol solvent (C2) is more preferably 45% by mass or less, and even more preferably 20% by mass or less.

[0151] <Water(D)>

[0152] The white cosmetic ink of the present embodiment contains water (D), preferably purified water. The function and specific examples of water (D) are the same as those of the above-mentioned blue cosmetic ink.

[0153] The content of water (D) is preferably 30% by mass or more and 70% by mass or less, and more preferably 55% by mass or more and 70% by mass or less, relative to the total amount of the white pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D). By setting the content of water (D) within this range, the viscosity of the white cosmetic ink can be easily adjusted to fall within a range suitable for inkjet printing.

[0154] <Other ingredients>

[0155] The white cosmetic ink may further contain any various additives known to those skilled in the art within the range that does not impair the shielding properties of the white cosmetic ink of the present embodiment and the effect of ejection stability in inkjet printing. Specific examples of the various additives are the same as those of the above-mentioned blue cosmetic ink.

[0156] 1-2-2. Method for preparing white cosmetic ink

[0157] The white cosmetic ink of this embodiment can be prepared by mixing a slurry or dispersion containing a white pigment (A), acrylic particles (B), an alcohol solvent (C) and water (D) and other components as required using a disperser, etc. The mixing method of each component is the same as that of the above-mentioned blue cosmetic ink.

[0158] 1-2-3. Physical properties of white cosmetic ink

[0159] The viscosity of the white cosmetic ink in this embodiment is preferably 3 mPa·s or more and 20 mPa·s or less at 25°C when measured by a cone-plate viscometer at a shear rate of 1000 (1 / s). By making the viscosity of the white cosmetic ink within this range, the white cosmetic ink can be ejected more stably from the inkjet printer. Specifically, the shape of the flying droplets after the ink is ejected can be made more stable, the shape of the droplets landing on the printed object can be made more uniform, and the ink ejection distortion can be prevented.

[0160] The viscosity of the white cosmetic ink when measured under the same conditions as above is more preferably 4 mPa·s or more, and more preferably 5 mPa·s or more. In addition, the viscosity of the white cosmetic ink when measured under the same conditions as above is more preferably 10 mPa·s or less, and more preferably 8 mPa·s or less.

[0161] The preferred pH range of the white cosmetic ink and the effects obtained by setting the pH within the preferred range are the same as those of the above-mentioned blue cosmetic ink.

[0162] The preferred range of the surface tension at 25° C. of the white cosmetic ink and the effects obtained by setting the surface tension within the preferred range are the same as those of the above-mentioned blue cosmetic ink.

[0163] The preferred ranges of the median diameter of particles contained in the white cosmetic ink (median value of the cumulative value in the particle size distribution (D50)) and the 90% value of the cumulative value in the particle size distribution (D90), and the effects brought about by setting them within the preferred ranges are the same as those in the case of the above-mentioned blue cosmetic ink.

[0164] In addition, the white cosmetic ink of the present embodiment is also preferably negative in skin irritation, that is, highly biosafe. The details of the negative skin irritation of the white cosmetic ink are the same as those of the above-mentioned blue cosmetic ink.

[0165] 2. Ink cartridges

[0166] When the blue or white cosmetic ink in the above embodiment is used as ink for inkjet printing, the blue or white cosmetic ink can be filled in an ink cartridge for storage. The type and / or structure of the ink cartridge is not particularly limited and can be appropriately selected according to the printing device used to print the cosmetic ink. As an example of the ink cartridge, there can be cited an ink cartridge having an ink storage portion for storing the blue or white cosmetic ink and an ink supply port for supplying the blue or white cosmetic ink to the recording nozzle of the printing device.

[0167] 3. Makeup tablets

[0168] 3-1. Cosmetic sheet using cosmetic ink (blue cosmetic ink or white cosmetic ink)

[0169] The cosmetic sheet in the present embodiment includes: a printed object; and a coating film formed on the printed object and having an ink layer formed of the blue or white cosmetic ink in the above-mentioned embodiment.

[0170] The cosmetic sheet can be produced, for example, by a method including: printing (or applying) the cosmetic ink of the above embodiment on a printed object; and drying the cosmetic ink applied to the printed object.

[0171] The method of printing the cosmetic ink on the printed object is not particularly limited, and examples thereof include inkjet printing, screen printing, offset printing, gravure printing, etc. Among these, the cosmetic ink in the above embodiment is preferably printed by inkjet printing from the viewpoint of excellent ejection stability in inkjet printing. By using inkjet printing, blue or white cosmetic ink can be applied to the printed object multiple times according to the skin condition and skin color of the user of the cosmetic sheet.

[0172] The method for producing a cosmetic sheet will be described in more detail below using the case of printing the cosmetic ink by inkjet printing as an example, but the method for producing the cosmetic sheet is not limited to this method.

[0173] When the cosmetic ink is applied to the printed object by inkjet printing, the inkjet printer may be any device known to those skilled in the art without particular limitation. For example, a device of any of a piezoelectric method, a heating method, and an electrostatic method may be used. Among these, a piezoelectric element method inkjet printer is preferred from the viewpoint of not requiring heating as in a heated inkjet method.

[0174] In addition, the cosmetic ink may be applied only once or twice on the printed object. It should be noted that when the cosmetic ink is applied multiple times on the printed object, the cosmetic ink may be dried each time it is applied, or may be dried after applying multiple times.

[0175] The method for drying the cosmetic ink applied to the printed body is not particularly limited as long as it is a method that can remove the alcohol solvent (C) and water (D) in the cosmetic ink. For example, a method of drying at atmospheric pressure and room temperature can be adopted, and a method of drying by heating to a specified temperature and / or reducing pressure can be adopted. In the case of heating, for example, it is preferably heated to 25 to 50°C. If it is within this temperature range, the sheet and the solid components in the cosmetic ink will not deteriorate and can be dried efficiently. On the other hand, in the case of reducing pressure, it is preferably reduced pressure at -0.1 to 0 MPa. By reducing pressure within this range, the ink can be dried efficiently.

[0176] The printed body to be coated with cosmetic ink is not particularly limited as long as it does not damage the characteristics of the suitable cosmetic ink in the above-mentioned embodiment (good skin color expression of blue cosmetic ink or good concealing property of white cosmetic ink) and the effect of ejection stability in inkjet printing. The printed body can be made of the same material as the base material of any cosmetic sheet known to those skilled in the art. As examples of the printed body, ordinary paper, special recording paper, plastic, cloth, etc. can be cited. In addition, the printed body can include only one layer, or it can be stacked in more than two layers. Among these, in particular, a sheet composed of a biocompatible material used for direct or indirect contact or close contact with the skin is appropriate.

[0177] Examples of biocompatible materials include: polyesters represented by polyglycolic acid, polylactic acid, polycaprolactone, polyethylene succinate, polyethylene terephthalate, or copolymers thereof; polyethers represented by polyethylene glycol and polypropylene glycol; polyamides represented by nylon, polyglutamic acid, polyaspartic acid, or salts thereof; polysaccharides represented by pullulan, cellulose, starch, chitin, deacetylated chitosan, alginic acid, hyaluronic acid, and corn starch, or salts thereof; silicones represented by acrylic silicone and trimethylsiloxysilicic acid; acrylics represented by alkyl acrylates, acrylic silicones, acrylic amides, and copolymers thereof; polyvinyl alcohol; polyurethane; polycarbonate; polyanhydride; polyethylene; polypropylene; and porous layer coated sheets, nanofiber sheets, and the like. Examples of the sheet made of the biocompatible material include a sheet for fixing medical members, a sheet for sports bandages, a skin decoration sheet, a cosmetic sheet, and a surgical adhesion barrier.

[0178] The thickness of the printed object is not particularly limited and can be appropriately selected depending on the purpose of the cosmetic sheet, the material of the printed object, etc. The printed object is preferably a sheet having a thickness of, for example, 10 nm to 3000 nm.

[0179] When forming an image on the film sheet, a laminated body formed by laminating a film sheet as a printed body and a support body supporting the film sheet can be printed, and the film can be peeled off from the support body after printing. As the support body, there is no particular limitation, for example, it can be a support body formed by a highly water-absorbent material. When the support body is water-absorbent, the alcohol solvent (C) and water (D) can be easily absorbed into the support body, and only the solid components of the cosmetic ink in the above embodiment can be adhered to the surface of the film sheet as the printed body. Therefore, the obtained image is not easy to penetrate, etc., so that a high-precision image can be formed. As an example of a highly water-absorbent support body, a substrate composed of paper, cloth, nonwoven fabrics, fabrics, porous layer coated sheets, nanofiber sheets, water-absorbent polymers, water-soluble polymers, etc. can be cited.

[0180] The cosmetic sheet produced using the blue cosmetic ink of the above embodiment can show good brightness in the coating film. Therefore, the cosmetic sheet using the blue cosmetic ink can be applied to the skin and used, for example, for color makeup, special makeup, face or body painting, barcode, other marking, etc.

[0181] Alternatively, the cosmetic sheet made using the white cosmetic ink in the above embodiment has excellent concealing properties for the discolored area. Therefore, the cosmetic sheet using the white cosmetic ink can be applied to the skin for use, and can be suitably used for medical purposes such as making the discolored area inconspicuous.

[0182] 3-2. Cosmetic sheet using cosmetic ink and other color cosmetic ink

[0183] The cosmetic sheet in this embodiment may include: a printed object; and a coating film formed on the printed object and having an ink layer formed of the blue or white cosmetic ink in the above embodiment and one or more ink layers formed of cosmetic inks of other colors.

[0184] The cosmetic sheet can be produced, for example, by the following method, comprising the steps of applying droplets of the blue cosmetic ink (or white cosmetic ink) in the above embodiment and droplets of cosmetic ink of one or more colors selected from the group consisting of white cosmetic ink (or blue cosmetic ink), red cosmetic ink, yellow cosmetic ink, and black cosmetic ink (preferably at offset positions); and drying the cosmetic ink applied to the printed object.

[0185] By applying the cosmetic inks of different colors at staggered positions, a coating film having desired brightness and spectral reflectivity can be easily formed in a desired area of ​​a printed object. For example, a coating film showing a desired skin color or a coating film having a spectral reflectivity that can be distinguished from the skin color can be formed in a desired area of ​​a printed object.

[0186] When using cosmetic inks of other colors, it is preferred to use two or more colors of cosmetic inks selected from the group consisting of white cosmetic ink (or blue cosmetic ink), red cosmetic ink, yellow cosmetic ink, and black cosmetic ink. Furthermore, it is more preferred to use three colors of cosmetic inks, namely white cosmetic ink (or blue cosmetic ink), red cosmetic ink, and yellow cosmetic ink. By combining the blue cosmetic ink or white cosmetic ink in the above embodiment with cosmetic inks of these colors, it is easier to form, for example, a coating film that exhibits a desired skin color, a coating film with a spectral reflectance that can be sensorily distinguished from the skin color, and a cosmetic sheet having a coating film with high shielding properties for a discolored area, etc. can be produced.

[0187] Furthermore, by appropriately adjusting the amount and / or application area of ​​the cosmetic ink of each color according to the purpose of the cosmetic sheet, a coating film having desired brightness and spectral reflectance can be formed in a desired printed area with high definition.

[0188] The composition of the white cosmetic ink or blue cosmetic ink, red cosmetic ink, yellow cosmetic ink, and black cosmetic ink as cosmetic inks of other colors is not particularly limited, but preferably contains components substantially similar to those of the blue cosmetic ink or white cosmetic ink in the above-mentioned embodiment. For example, it preferably contains a pigment other than blue (A) (or a pigment other than white (A)), acrylic particles (B), an alcohol solvent (C), and water (D).

[0189] The method of applying each color of cosmetic ink is not particularly limited, and examples thereof include inkjet printing, screen printing, offset printing, gravure printing, etc. Among these, inkjet printing is preferred because the blue cosmetic ink in the above embodiment has excellent discharge stability in inkjet printing.

[0190] When forming the coating film by inkjet printing, firstly, the ink tank of the inkjet printer is filled with blue cosmetic ink (or white cosmetic ink) and one or more cosmetic inks selected from the group consisting of white cosmetic ink (or blue cosmetic ink), red cosmetic ink, yellow cosmetic ink and black cosmetic ink. Then, for example, the cosmetic inks of each color are applied at the same position or at staggered positions.

[0191] Specifically, when the cosmetic inks of each color are applied to the same position, after printing the first color using an inkjet printer, the second color is printed without moving or rotating the nozzle or the printed body. The printing of the third color and thereafter is performed in the same manner. On the other hand, when the cosmetic inks of each color are applied to offset positions, after printing the first color using an inkjet printer, the nozzle or the printed body is moved or rotated in a specified direction to print the second color. Then, when printing the third color and thereafter, the nozzle or the printed body is similarly moved or rotated in a specified direction to print. Thus, the droplets of the cosmetic inks of each color can be made to land at appropriately offset positions. From the viewpoint of making the coating of the printed body more uniform and forming a high-precision coating, it is preferred to apply the cosmetic inks of each color to offset positions.

[0192] The printed object to be applied with the ink is the same as the case where the cosmetic sheet is produced using only the above-mentioned blue or white cosmetic ink.

[0193] The cosmetic sheet produced using the blue cosmetic ink and other colors of cosmetic ink in the above embodiment can well express the skin color in its coating film. In addition, the cosmetic sheet produced using the white cosmetic ink and other colors of cosmetic ink in the above embodiment not only has excellent concealment of the discolored area, but also can form a coating film that expresses the desired skin color, a coating film with a spectral reflectance that can be distinguished from the skin color, etc. Therefore, the cosmetic sheet can be used by being attached to the skin, for example, and can be used not only for medical purposes such as making the discolored area inconspicuous, but also for various purposes such as skin color, beautification, and makeup.

[0194] While the outline of the present invention has been described above, the cosmetic ink and cosmetic sheet according to the present embodiment are summarized as follows.

[0195] (1) A cosmetic ink according to a first aspect of the present embodiment is a blue cosmetic ink, and includes:

[0196] Blue pigment (A);

[0197] Acrylic particles (B);

[0198] an alcohol solvent (C); and

[0199] Water (D), where

[0200] The content of the blue pigment (A) is 0.5% by mass or more and 4.5% by mass or less relative to the total amount of the blue pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D),

[0201] The alcohol solvent (C) comprises a divalent alcohol solvent (C1) and a trivalent alcohol solvent (C2).

[0202] The total content of the above-mentioned divalent alcohol solvent (C1) and the above-mentioned trivalent alcohol solvent (C2) is 30% by mass or more and 85% by mass or less relative to the total amount of the above-mentioned blue pigment (A), the above-mentioned acrylic particles (B), the above-mentioned alcohol solvent (C) and the above-mentioned water (D).

[0203] (2) In the cosmetic ink described in (1) above, preferably, the content of the divalent alcohol solvent (C1) is 15% by mass or more and 45% by mass or less, and the content of the trivalent alcohol solvent (C2) is 15% by mass or more and 45% by mass or less, relative to the total amount of the blue pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D).

[0204] (3) In the cosmetic ink described in (1) or (2) above, it is more preferred that the blue pigment (A) comprises at least one selected from Prussian blue (ferric ferrocyanide), ultramarine blue, lapis lazuli, azurite, aluminum-cobalt oxide, aluminum-zinc-cobalt oxide, silicon-cobalt oxide, silicon-zinc-cobalt oxide, cobalt pigment, cyan, cobalt blue, cobalt stannate, cobalt chrome blue, cobalt-aluminum-silicon oxide and manganese blue.

[0205] (4) In the cosmetic ink according to any one of (1) to (3) above, it is further preferred that the median diameter of the blue pigment (A) is 90 nm or more and 500 nm or less.

[0206] (5) In the cosmetic ink described in any one of (1) to (4) above, it is particularly preferred that the viscosity at 25° C. measured at a shear rate of 1000 (1 / s) using a cone-plate viscometer is 3 mPa·s or more and 15 mPa·s or less.

[0207] (6) Another cosmetic ink according to the first aspect of the present embodiment is white cosmetic ink, and includes:

[0208] White pigment (A);

[0209] Acrylic particles (B);

[0210] alcohol solvent (C); and

[0211] Water (D), where

[0212] The median diameter of the white pigment (A) is 300 nm or more and 900 nm or less,

[0213] The content of the white pigment (A) is 4% by mass or more and 35% by mass or less relative to the total amount of the white pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D),

[0214] The alcohol solvent (C) comprises a divalent alcohol solvent (C1) and a trivalent alcohol solvent (C2).

[0215] The total content of the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) is 17% by mass or more and 55% by mass or less relative to the total amount of the white pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D).

[0216] (7) In the cosmetic ink described in (6) above, preferably, the content of the acrylic particles (B) is 3% by mass or more and 20% by mass or less relative to the total amount of the white pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D).

[0217] (8) In the cosmetic ink described in (6) or (7) above, it is more preferred that the viscosity at 25°C measured by a cone-plate viscometer at a shear rate of 1000 (1 / s) is 3 mPa·s or more and 20 mPa·s or less.

[0218] (9) In the cosmetic ink described in any one of (6) to (8) above, it is further preferred that: the content of the divalent alcohol solvent (C1) is 10% by mass or more and 40% by mass or less, and the content of the trivalent alcohol solvent (C2) is 7% by mass or more and 45% by mass or less, relative to the total amount of the white pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D).

[0219] (10) In the cosmetic ink described in any one of (6) to (9) above, it is particularly preferred that the white pigment (A) comprises at least one selected from titanium oxide, zinc oxide, cerium oxide, barium sulfate, talc, muscovite, phlogopite, red mica, biotite, synthetic mica, sericite, synthetic sericite, kaolin, silicon carbide, bentonite, montmorillonite, silicic anhydride, aluminum oxide, magnesium oxide, zirconium oxide, antimony oxide, diatomaceous earth, aluminum silicate, magnesium aluminum metasilicate, calcium silicate, barium silicate, magnesium silicate, calcium carbonate, magnesium carbonate, hydroxyapatite and boron nitride.

[0220] (11) In the cosmetic ink according to any one of (1) to (10) above, it is preferred that the alcohol solvent (C) contains an alcohol solvent having a boiling point of 200° C. or higher.

[0221] (12) In the cosmetic ink described in any one of (1) to (11) above, it is more preferred that the divalent alcohol solvent (C1) contains at least one selected from diethylene glycol, propylene glycol, 1,3-propanediol, butylene glycol and hexylene glycol.

[0222] (13) In the cosmetic ink described in any one of (1) to (12) above, it is further preferred that the acrylic particles (B) contain at least one of a homopolymer of a (meth)acrylic monomer and a copolymer of two or more (meth)acrylic monomers.

[0223] (14) In the cosmetic ink described in any one of (1) to (13) above, it is particularly preferred that the cosmetic ink is an inkjet printing ink for inkjet printing on a sheet having a thickness of 10 nm to 3000 nm.

[0224] (15) A cosmetic sheet according to a second aspect of the present embodiment includes:

[0225] A sheet having a thickness of 10 nm or more and 3000 nm or less; and

[0226] The coating film is formed on the sheet and has at least an ink layer formed from the cosmetic ink described in any one of (1) to (14) above.

[0227] Example

[0228] Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to the examples at all.

[0229] [Material of blue cosmetic ink]

[0230] The materials of the blue cosmetic ink used in each example and each comparative example are as follows: The median diameter of each particle is the median value (D50) of the cumulative value in the particle size distribution measured by laser diffraction method.

[0231] Blue pigment (A): Prussian blue (median diameter: 105nm)

[0232] Acrylic particles (B): acrylic acid (ester) copolymer (median diameter: 5 nm)

[0233] · Divalent alcohol solvent (C1): 1,3-propylene glycol

[0234] ·Trivalent alcohol solvent (C2): glycerol

[0235] Water (D): Purified water

[0236] [Example 1]

[0237] In Example 1, each blue cosmetic ink was prepared by changing the content of the blue pigment (A) contained in the blue cosmetic ink. Specifically, each blue cosmetic ink was prepared by mixing the above materials according to the component ratios of Examples 1-1 to 1-4 and Comparative Examples 1-1 to 1-2 shown in Table 1 below.

[0238] [evaluate]

[0239] The viscosity of each of the prepared blue cosmetic inks was measured by the method described below. In addition, the skin color expression of each of the blue cosmetic inks and the ejection stability during inkjet printing were also evaluated by the method described below.

[0240] (Method for measuring viscosity of blue cosmetic ink)

[0241] The viscosity of the blue cosmetic ink was measured using a cone-plate viscometer (viscosity / viscoelasticity measuring device HAAKE MARS manufactured by Thermo Fisher Scientific). Specifically, 0.3 cc of the blue cosmetic ink was collected with a syringe and sampled onto the cone-plate, and the shear rate was varied within a range of 0.1 to 1000 (1 / s) at a measuring temperature of 25°C while the measurement was performed.

[0242] (Evaluation method for skin color expression of blue cosmetic ink)

[0243] Regarding the skin color expression of blue cosmetic ink, cosmetic sheets were made using the blue cosmetic ink of each embodiment and each comparative example, and the evaluation was performed using the same. First, each prepared blue cosmetic ink was filled into the ink tank of an inkjet printer equipped with an LB3 inkjet head manufactured by Panasonic Precision Devices Co., Ltd. In addition, a polylactic acid sheet with a thickness of 400 nm was attached to a support made of filter paper to prepare a printed body. Next, the blue cosmetic ink was applied to the polylactic acid sheet using an inkjet printer to form a circular pattern (solid pattern) with a radius of 30 mm. At this time, the amount of blue cosmetic ink applied was set to 10 nl. In addition, on the pattern of the blue cosmetic ink, 100 nl of each red cosmetic ink and yellow cosmetic ink were stacked in the form of a solid pattern by the same method. The printed sheet was dried at 50°C to obtain each cosmetic sheet.

[0244] Next, the skin color expression of the coating film formed on the obtained cosmetic sheet was evaluated by the following method. Specifically, the L of the obtained coating film was measured under the conditions of main light source: D50 and measurement mode: SCE using a spectrophotometer (manufactured by Konica Minolta, "CM-700d"). * a* b * L of the color system * Value, a * Value and b * On the other hand, the L value of the skin model (biological skin (Beaulax, product number BIO)) was also measured in the same manner. * a * b * L of the color system * Value, a * Value and b * Then, the color difference ΔE between the coating and the skin model was calculated. * ab. When ΔE * When ab is less than 13.0, it is assumed to have appropriate skin color expression (indicated by "A" in Tables 1 and 2 below). * When ab is 13.0 or more, it is determined that the skin color expression is not appropriate (indicated by "C" in Tables 1 and 2 described later).

[0245] (Evaluation method of ejection stability in inkjet printing)

[0246] The ejection stability of blue cosmetic ink in inkjet printing was measured by the following method. First, the prepared blue cosmetic ink was filled into the ink tank of an inkjet printer equipped with an LB3 inkjet head manufactured by Panasonic Precision Equipment Co., Ltd. Then, an inkjet ejection observation device was used to observe and photograph the flight of droplets of blue cosmetic ink ejected from the inkjet head on a camera monitor. The flight angle of the ink droplets relative to the inkjet head was measured from the observed and photographed images and animations, and evaluated by the ejection distortion (angle) in inkjet printing. It should be noted that when the ejection distortion is less than 2°

[0247] When , it is determined that: stable ejection is possible.

[0248]

[0249] (result)

[0250] As shown in Table 1 above, when the content of the blue pigment (A) contained in the blue cosmetic ink is in the range of 0.5 mass % to 4.5 mass % relative to the total amount of the blue pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D), the skin color expression of the printed matter obtained by using the blue cosmetic ink can be improved (see Examples 1-1 to 1-4).

[0251] On the other hand, when the content of the blue pigment (A) in the blue cosmetic ink was 0 mass %, the skin color expression was not good (see Comparative Example 1-1). Furthermore, when the content of the blue pigment (A) in the blue cosmetic ink was increased to 5.18 mass %, the skin color expression was not good (see Comparative Example 1-2).

[0252] It should be noted that all of the blue cosmetic inks of Examples 1-1 to 1-4 and Comparative Examples 1-1 to 1-2 had good discharge stability in inkjet printing.

[0253] [Example 2]

[0254] In Example 2, each blue cosmetic ink was prepared by changing the content of the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) contained in the blue cosmetic ink. Specifically, each blue cosmetic ink was prepared by mixing the above materials according to the component ratios of Examples 2-1 to 2-3 and Comparative Examples 2-1 to 2-5 shown in Table 2 below.

[0255] [evaluate]

[0256] The viscosity of each of the prepared blue cosmetic inks was measured in the same manner as in Example 1. In addition, the skin color expression properties of each of the blue cosmetic inks and the ejection stability during inkjet printing were also evaluated in the same manner as in Example 1.

[0257]

[0258] (result)

[0259] As shown in Table 2 above, when both a divalent alcohol solvent (C1) and a trivalent alcohol solvent (C2) are included as the alcohol solvent (C) and the content of the alcohol solvent (C) is 30% by mass or more and 85% by mass or less relative to the total amount of the blue pigment (A), acrylic particles (B), the alcohol solvent (C) and water (D), the ejection stability in inkjet printing can be improved (refer to Example 2-1 to Example 2-3).

[0260] On the other hand, when the content of the alcohol solvent (C) was reduced to 20.7% by mass, the ejection stability in inkjet printing deteriorated (see Comparative Examples 2-1, 2-2 and 2-4). Furthermore, when the alcohol solvent (C) did not contain both the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2), the ejection stability in inkjet printing deteriorated (see Comparative Examples 2-3 and 2-5).

[0261] It should be noted that the blue cosmetic inks of Examples 2-1 to 2-3 and Comparative Examples 2-1 to 2-5 all had good skin color expression properties.

[0262] [Material of white cosmetic ink]

[0263] The materials of the white cosmetic ink used in each example and each comparative example are as follows. As in the case of the blue cosmetic ink, the median diameter of each particle is the median value (D50) of the cumulative value in the particle size distribution measured by laser diffraction method.

[0264] White pigment (A): titanium oxide (median diameter: 175nm, 250nm, 340nm, 881nm and 950nm)

[0265] Acrylic particles (B): acrylic acid (ester) copolymer (median diameter: 5 nm)

[0266] · Divalent alcohol solvent (C1): 1,3-propylene glycol

[0267] ·Trivalent alcohol solvent (C2): glycerol

[0268] Water (D): Purified water

[0269] [Example 3]

[0270] In Example 3, each white cosmetic ink was prepared by changing the median diameter of the white pigment (A) contained in the white cosmetic ink. Specifically, the white pigment (A) having the median diameter in Examples 3-1 and 3-2 and Comparative Examples 3-1 and 3-3 shown in Table 3 below was used, and the above materials were mixed at various component ratios to prepare each white cosmetic ink.

[0271] [evaluate]

[0272] The viscosity of each prepared white cosmetic ink was measured by the same method as in the case of the above-mentioned blue cosmetic ink. In addition, the ejection stability of each white cosmetic ink in inkjet printing and the concealing property of the cosmetic sheet produced using each white cosmetic ink on the discolored area were evaluated by the method described below. In addition, as a reference evaluation unrelated to the effect of the white cosmetic ink of the present invention (hiding property and ejection stability in inkjet printing), the adhesion (water resistance) of each white cosmetic ink was also evaluated by the method described below.

[0273] (Evaluation method of ejection stability in inkjet printing)

[0274] The ejection stability of the white cosmetic ink in inkjet printing was measured by the following method. First, each prepared white cosmetic ink was filled in the ink tank of an inkjet printer equipped with an LB3 inkjet head manufactured by Panasonic Precision Equipment Co., Ltd. Then, a circular pattern (solid pattern) with a radius of 30 mm was formed on an OHP sheet (transmittance of light with a wavelength of 380 to 780 nm: 90%, OHP film manufactured by A-one (Product No.: 27077)) as a printed body using an inkjet printer. At this time, the coating amount of the white cosmetic ink was set to 10 μl. The printed sheet was dried at 50°C to obtain each print. Secondly, the inkjet printer's nozzle was visually confirmed to be clogged, and the printed pattern was carefully observed visually.

[0275] The evaluation was performed based on the following criteria.

[0276] AA: No nozzle clogging and no print-through.

[0277] A: There is no obvious print-through, but the printing direction can be identified upon careful observation (it is not an identical printing pattern, but the arrangement direction of the ink landing can be identified).

[0278] C: The nozzle is clogged and streak-like print-through occurs.

[0279] (Evaluation method for shielding properties of discolored areas)

[0280] Regarding the concealing property of the discolored area, the white cosmetic ink of each embodiment and each comparative example was used to make a cosmetic sheet, and the evaluation was performed using it. First, each prepared white cosmetic ink was filled in the ink tank of an inkjet printer equipped with an LB3 inkjet head manufactured by Panasonic Precision Equipment Co., Ltd. In addition, a polylactic acid sheet with a thickness of 400nm was attached to a support made of filter paper to prepare as a printed body. Next, using an inkjet printer, white cosmetic ink was applied to the polylactic acid sheet to form a circular pattern (solid pattern) with a radius of 30mm. At this time, the coating amount of each cosmetic ink was set to 10μl. The printed sheet was dried at 50°C to obtain each cosmetic sheet. Next, each prepared cosmetic sheet was attached to a spot (age spot) with an L value of 62, and the concealing property of the spot was evaluated visually.

[0281] The evaluation was performed based on the following criteria.

[0282] AA: Spots can be concealed (the color and boundary of the spots cannot be confirmed visually).

[0283] A: The boundary of the spot cannot be identified, but if you look closely at it, you can see that the color tone of the area outside the spot is slightly different from that of the center of the spot.

[0284] C: Unable to cover spots.

[0285] (Evaluation method of adhesion (water resistance) (reference evaluation))

[0286] The adhesion (water resistance) of the white cosmetic ink was evaluated by the following method. First, each prepared white cosmetic ink was filled into the ink tank of an inkjet printer equipped with an LB3 inkjet head manufactured by Panasonic Precision Equipment Co., Ltd. In addition, a polylactic acid sheet with a thickness of 400nm was attached to a support made of filter paper to prepare a printed body. Next, the white cosmetic ink was applied to the polylactic acid sheet using an inkjet printer to form a circular pattern (solid pattern) with a radius of 30mm. At this time, the coating amount of the white cosmetic ink was set to 10μl. The printed sheet was dried at 50°C to obtain a printed material. Next, enough water was dripped from the top of the ink layer of the printed material to the extent that the printed material was immersed in water, and the dissolution of the ink was visually observed.

[0287] The evaluation was performed based on the following criteria.

[0288] AA: The ink does not dissolve into water.

[0289] A: No obvious ink elution was observed, but a small amount of ink adhered to the finger when the printed surface was rubbed.

[0290] B: The ink is dissolved into the water.

[0291]

[0292] (result)

[0293] As shown in Table 3 above, when the median diameter of the white pigment (A) contained in the white cosmetic ink is 300 nm or more and 900 nm or less, the cosmetic sheet produced using the white cosmetic ink can well shield the discolored area and has good ejection stability during inkjet printing (see Examples 3-1 and 3-2).

[0294] On the other hand, when the median diameter of the white pigment (A) contained in the white cosmetic ink was reduced to 250 nm, the cosmetic sheet produced using the white cosmetic ink could not well shield the discolored area (see Comparative Examples 3-1 and 3-2). In addition, when the median diameter of the white pigment (A) contained in the white cosmetic ink was increased to 950 nm, the ejection stability in inkjet printing deteriorated (see Comparative Example 3-3).

[0295] It should be noted that the white cosmetic inks of Examples 3-1 and 3-2 and Comparative Examples 3-1 and 3-3 all had good adhesion (water resistance).

[0296] [Example 4]

[0297] In Example 4, each white cosmetic ink was prepared by changing the content of the white pigment (A) contained in the white cosmetic ink. Specifically, each white cosmetic ink was prepared by mixing the above materials according to the component ratios of Examples 4-1 to 4-4 and Comparative Examples 4-1 to 4-2 shown in Table 4 below.

[0298] [evaluate]

[0299] The viscosity of each prepared white cosmetic ink was measured in the same manner as in Example 3. In addition, the ejection stability during inkjet printing, the shielding property of the discolored area, and the adhesion (water resistance) of each white cosmetic ink were also evaluated in the same manner as in Example 3.

[0300]

[0301] (result)

[0302] As shown in Table 4 above, by making the content of the white pigment (A) contained in the white cosmetic ink 4% by mass or more and 35% by mass or less relative to the total amount of the white pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D), the concealing property of the cosmetic sheet on the color change area can be improved and the ejection stability in the inkjet printing can also be improved (refer to Examples 4-1 to 4-4).

[0303] On the other hand, when the content of the white pigment (A) contained in the white cosmetic ink was reduced to 3% by mass, the cosmetic sheet produced using the white cosmetic ink could not well shield the discolored area (see Comparative Example 4-1). Furthermore, when the content of the white pigment (A) in the white cosmetic ink was increased to 40% by mass, the ejection stability in inkjet printing deteriorated (see Comparative Example 4-2).

[0304] It should be noted that the white cosmetic inks of Examples 4-1 to 4-4 and Comparative Examples 4-1 to 4-2 all had good adhesion (water resistance).

[0305] [Example 5]

[0306] In Example 5, the contents of the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) contained in the white cosmetic ink were changed to prepare each white cosmetic ink. Specifically, the above materials were mixed according to the component ratios of Examples 5-1 to 5-6 and Comparative Examples 5-1 to 5-4 shown in Table 5 below, thereby preparing each white cosmetic ink.

[0307] [evaluate]

[0308] The viscosity of each prepared white cosmetic ink was measured in the same manner as in Example 3. In addition, the ejection stability during inkjet printing, the shielding property of the discolored area, and the adhesion (water resistance) of each white cosmetic ink were also evaluated in the same manner as in Example 3.

[0309]

[0310] (result)

[0311] As shown in Table 5 above, when the content of the alcohol solvent (C) is 17% by mass or more and 55% by mass or less relative to the total amount of the white pigment (A), acrylic particles (B), alcohol solvent (C) and water (D), the ejection stability in inkjet printing can be improved (refer to Examples 5-1 to 5-6).

[0312] On the other hand, when the content of the alcohol solvent (C) was reduced to 15% by mass, the ejection stability in inkjet printing deteriorated (see Comparative Examples 5-1 and 5-3). Furthermore, when the content of the alcohol solvent (C) was increased to 60% by mass, the ejection stability in inkjet printing also deteriorated (see Comparative Examples 5-2 and 5-4).

[0313] It should be noted that the white cosmetic inks of Examples 5-1 to 5-6 and Comparative Examples 5-1 to 5-4 all had good adhesion (water resistance).

[0314] [Example 6]

[0315] In Example 6, regardless of the effect of the white cosmetic ink of the present invention on the hiding property and the ejection stability in inkjet printing, the content of the acrylic particles (B) contained in the white cosmetic ink was changed to prepare each white cosmetic ink. Specifically, the above-mentioned materials were mixed according to the component ratios of Example 6-1 to Example 6-6 shown in Table 6 below, thereby preparing each white cosmetic ink.

[0316] [evaluate]

[0317] The viscosity of each prepared white cosmetic ink was measured by the same method as in Example 3. In addition, the ejection stability during inkjet printing, the shielding property of the discolored area, and the adhesion (water resistance) of each white cosmetic ink were also evaluated by the same method as in Example 3.

[0318]

[0319] (result)

[0320] As shown in Table 6 above, when the content of the acrylic particles (B) is 3% by mass or more relative to the total amount of the white pigment (A), the acrylic particles (B), the alcohol solvent (C) and water (D), not only the ejection stability and the shielding property of the discolored area in the inkjet printing of the white cosmetic ink can be improved, but also the adhesion (water resistance) can be reliably improved.

[0321] This application is based on Japanese patent application No. 2022-071815 and No. 2022-071816 filed on April 25, 2022, and the contents thereof are included in this application.

[0322] The embodiments and examples disclosed this time are illustrative in all aspects and should not be interpreted as limiting. The scope of the present invention is indicated by the claims rather than the above description, and is intended to include all changes within the meaning and scope equivalent to the claims.

[0323] Industrial Applicability

[0324] The cosmetic sheet using the cosmetic ink of the present invention can be used for various purposes, such as medical purposes for making discolored areas less noticeable, and cosmetic purposes such as coloring and beautifying the skin and makeup.

Claims

1. A cosmetic ink, characterized in that: The cosmetic ink is blue cosmetic ink and comprises: Blue pigment (A); Acrylic particles (B); an alcohol solvent (C); and Water (D), where The content of the blue pigment (A) is 0.5% by mass or more and 4.5% by mass or less relative to the total amount of the blue pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D), The alcohol solvent (C) comprises a divalent alcohol solvent (C1) and a trivalent alcohol solvent (C2), The total content of the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) is 30% by mass or more and 85% by mass or less relative to the total amount of the blue pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D).

2. The cosmetic ink according to claim 1, characterized in that: Relative to the total amount of the blue pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D), the content of the divalent alcohol solvent (C1) is greater than 15 mass % and less than 45 mass %, and the content of the trivalent alcohol solvent (C2) is greater than 15 mass % and less than 45 mass %.

3. The cosmetic ink according to claim 1 or 2, characterized in that: The blue pigment (A) comprises at least one selected from Prussian blue, i.e., ferric ferrocyanide, Buddha's head blue, i.e., ultramarine blue, lapis lazuli, azurite, aluminum-cobalt oxide, aluminum-zinc-cobalt oxide, silicon-cobalt oxide, silicon-zinc-cobalt oxide, cobalt pigment, cyan, cobalt blue, cobalt stannate, cobalt chrome blue, cobalt-aluminum-silicon oxide and manganese blue.

4. The cosmetic ink according to claim 1 or 2, characterized in that: The median diameter of the blue pigment (A) is 90 nm or more and 500 nm or less.

5. The cosmetic ink according to claim 1 or 2, characterized in that: The viscosity at 25° C. when measured with a cone-plate viscometer at a shear rate of 1000 (1 / s) is 3 mPa·s or more and 15 mPa·s or less.

6. A cosmetic ink, characterized in that: The cosmetic ink is white cosmetic ink and comprises: White pigment (A); Acrylic particles (B); an alcohol solvent (C); and Water (D), where The median diameter of the white pigment (A) is 300 nm or more and 900 nm or less, The content of the white pigment (A) is 4% by mass or more and 35% by mass or less relative to the total amount of the white pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D), The alcohol solvent (C) comprises a divalent alcohol solvent (C1) and a trivalent alcohol solvent (C2), The total content of the divalent alcohol solvent (C1) and the trivalent alcohol solvent (C2) is 17% by mass or more and 55% by mass or less relative to the total amount of the white pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D).

7. The cosmetic ink according to claim 6, characterized in that: The content of the acrylic particles (B) is 3% by mass or more and 20% by mass or less based on the total amount of the white pigment (A), the acrylic particles (B), the alcohol solvent (C), and the water (D).

8. The cosmetic ink according to claim 6 or 7, characterized in that: The viscosity at 25° C. when measured with a cone-plate viscometer at a shear rate of 1000 (1 / s) is 3 mPa·s or more and 20 mPa·s or less.

9. The cosmetic ink according to claim 6 or 7, characterized in that: Relative to the total amount of the white pigment (A), the acrylic particles (B), the alcohol solvent (C) and the water (D), the content of the divalent alcohol solvent (C1) is 10% by mass or more and 40% by mass or less, and the content of the trivalent alcohol solvent (C2) is 7% by mass or more and 45% by mass or less.

10. The cosmetic ink according to claim 6 or 7, characterized in that: The white pigment (A) comprises at least one selected from titanium oxide, zinc oxide, cerium oxide, barium sulfate, talc, muscovite, phlogopite, red mica, biotite, synthetic mica, sericite, synthetic sericite, kaolin, silicon carbide, bentonite, montmorillonite, silicic anhydride, aluminum oxide, magnesium oxide, zirconium oxide, antimony oxide, diatomaceous earth, aluminum silicate, magnesium aluminum metasilicate, calcium silicate, barium silicate, magnesium silicate, calcium carbonate, magnesium carbonate, hydroxyapatite and boron nitride.

11. The cosmetic ink according to claim 1 or 6, characterized in that: The alcoholic solvent (C) includes an alcoholic solvent having a boiling point of 200° C. or higher.

12. The cosmetic ink according to claim 1 or 6, characterized in that: The divalent alcohol solvent (C1) includes at least one selected from the group consisting of diethylene glycol, propylene glycol, 1,3-propanediol, butylene glycol, and hexylene glycol.

13. The cosmetic ink according to claim 1 or 6, characterized in that: The acrylic particles (B) include at least one of a homopolymer of a (meth)acrylic monomer and a copolymer of two or more (meth)acrylic monomers.

14. The cosmetic ink according to claim 1 or 6, characterized in that: The cosmetic ink is an inkjet printing ink for inkjet printing on a sheet having a thickness of 10 nm to 3000 nm.

15. A cosmetic sheet, characterized in that include: A sheet having a thickness of 10 nm or more and 3000 nm or less; as well as The coating film is formed on the sheet and has at least an ink layer formed from the cosmetic ink according to claim 1 or 6.

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