Hydrogel composition with color change

Abstract

The present invention relates to a hydrogel composition comprising a functional ingredient and an alcohol. Specifically, it relates to a hydrogel composition designed such that the functional ingredient is gradually delivered to the skin while simultaneously adsorbing sebum and waste products by appropriately combining the functional ingredient and the alcohol. According to the above composition, within the hydrogel matrix, the solubility of the functional ingredient decreases due to water movement and some ingredients precipitate; during this process, a color change reaction occurs in which a transparent color changes to a milky white color. Furthermore, the color change is characterized by providing a color change effect that allows the change in the state of the ingredients within the hydrogel to be visually confirmed, thereby enabling intuitive recognition of the composition's functioning state.

Description

Technology Field

[0001] The present invention relates to a hydrogel composition having a color-changing effect, and specifically, to a hydrogel composition having a color-changing effect in which the existing transparent color gradually changes to milky white by optimally combining a functional ingredient and an alcohol, and as the solubility of the functional ingredient decreases and a precipitation phenomenon occurs due to the hydration phenomenon during use. Background Technology

[0002] Patch and mask products incorporating hydrogel compositions can provide excellent adhesion, hydration, and delivery of functional ingredients, and demand has been steadily increasing recently, particularly among consumers who value functionality and sensory satisfaction. In particular, as consumer demand for intuitively checking whether a product is working or the progress of use on the skin increases, interest in hydrogel products that change color or visually indicate the state of action during use is also gradually growing.

[0003] However, conventional hydrogel patch and mask products are often developed with a focus on single functions such as moisturization or nutrient supply, and thus have limitations in that they fail to sufficiently meet complex improvement requirements, such as the absorption of skin impurities and sebum. In addition, most products lack color changes that allow visual confirmation of the active state of the composition during use, and even when color changes, the change is generally in the direction of becoming transparent from milky white as the functional ingredients dissolve, making it difficult for users to intuitively perceive whether the product is working directly on the skin.

[0004] Accordingly, the present invention provides a hydrogel composition that implements a color-changing effect by utilizing the precipitation of functional ingredients, thereby delivering active ingredients to the skin while simultaneously adsorbing skin waste and sebum, and developing a hydrogel composition that exhibits a visual change in which a transparent formulation turns into a milky white color during use. Prior art literature

[0005] Published Patent Application No. 10-2025-0019788 The problem to be solved

[0006] The present invention aims to provide a hydrogel composition that satisfies both the functional and sensory needs of consumers by combining a functional ingredient and an alcohol, thereby providing a functional effect of delivering the functional ingredient to the skin while simultaneously adsorbing waste products or sebum on the skin, and simultaneously providing a visual effect of the hydrogel changing from a transparent color to a milky white color.

[0007] The technical problems of the present invention are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0008] According to an embodiment of the present invention, a hydrogel composition comprising a functional ingredient, a dihydric alcohol, and a trihydric alcohol is provided.

[0009] In addition, the functional ingredient may be one or more selected from the group consisting of niacinamide, caffeine, and allantoin.

[0010] In addition, niacinamide may be included in an amount of 6 to 34 weight percent based on the total weight of the hydrogel composition.

[0011] In addition, caffeine may be included in an amount of 0.4 to 5 weight percent based on the total weight of the hydrogel composition.

[0012] In addition, allantoin may be included in an amount of 0.3 to 5 weight percent based on the total weight of the hydrogel composition.

[0013] In addition, the dihydric alcohol may be one or more selected from the group consisting of 1,2-hexanediol, butylene glycol, propanediol, ethylene glycol, pentylene glycol, caprylyl glycol, and dipropylene glycol.

[0014] In addition, dihydric alcohol may be included in an amount of 1 to 24 weight percent based on the total weight of the hydrogel composition.

[0015] In addition, the trihydric alcohol may include at least one of glycerin and 1,2,6-hexanetriol.

[0016] In addition, trihydric alcohol may be included in an amount of 1 to 29 weight percent based on the total weight of the hydrogel composition.

[0017] In addition, the hydrogel composition may further include one or more selected from the group consisting of monohydric alcohols, surfactants, oils, antioxidants, antifoaming agents, thickeners, and preservatives.

[0018] In addition, the hydrogel composition may be characterized by a color change from transparent to milky white.

[0019] According to another embodiment of the present invention, a hydrogel patch comprising a hydrogel composition is provided.

[0020] According to another embodiment of the present invention, a hydrogel mask pack comprising a hydrogel composition is provided. Effects of the invention

[0021] The hydrogel composition according to the present invention, through a combination of functional ingredients and alcohol, simultaneously performs the delivery of functional ingredients to the skin and the adsorption of waste and sebum from the skin, and, unlike typical color changes of the past, has the characteristic of realizing a color change from transparent to milky white.

[0022] In addition, the hydrogel composition according to the present invention can provide a rich moisturizing sensation and excellent adhesion to the skin upon use, and can achieve visual differentiation through a visual effect in which the transparent color changes to milky white. Furthermore, by providing a stable formulation in which uniformity among the ingredients is maintained, it maintains excellent physical stability even during use, and has the advantage of simultaneously conveying reliability and quality excellence to consumers through the combination of such formulation stability and visual differentiation. Brief explanation of the drawing

[0023] A brief description of each drawing is provided to help to better understand the drawings cited in the detailed description of the invention. Figure 1 is a figure showing a case where the color change effect is properly implemented as a result of checking whether the color change effect is implemented. Figure 2 is a figure showing a case where the color change effect is only partially implemented as a result of checking whether the color change effect is implemented. Figure 3 is a figure showing a case where the color change effect was not properly implemented as a result of checking whether the color change effect was implemented. Specific details for implementing the invention

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by a skilled expert in the art to which the present invention pertains. In general, the nomenclature used herein is well known and commonly used in the art. Furthermore, in describing embodiments of the present invention, detailed descriptions of related known components or functions are omitted if it is determined that such detailed descriptions would hinder understanding of the embodiments of the present invention. Additionally, while embodiments of the present invention will be described below, the technical concept of the present invention is not limited or restricted thereto and can be modified and implemented in various ways by those skilled in the art.

[0025] In this specification, when a part is described as including a certain component, it means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. In this specification, the term "and / or" includes a combination of a plurality of related items or any one of a plurality of related items.

[0027] According to an embodiment of the present invention, a hydrogel composition comprising a functional ingredient, a dihydric alcohol, and a trihydric alcohol is provided.

[0028] The hydrogel composition according to an embodiment of the present invention contains a functional ingredient and an alcohol, thereby enabling simultaneous delivery of the functional ingredient to the skin and adsorption of waste and sebum from the skin, and is characterized by a color change effect from transparent to milky white. In particular, by optimally combining the above ingredients, it is possible to provide a rich moisturizing sensation and excellent adhesion to the skin, and at the same time, a differentiated visual effect can be achieved through a color change different from conventional typical color changes.

[0029] The above-mentioned active ingredient refers to a component included in cosmetic compositions, etc., that causes direct physiological effects on the skin or exerts specific functional efficacy. Representative functions include moisturizing, whitening, wrinkle improvement, anti-inflammatory, soothing, and sebum control, and are designed to be effectively delivered to the skin by being combined with other ingredients within the formulation.

[0030] In one embodiment, the functional ingredient may be one or more selected from the group consisting of niacinamide, caffeine, and allantoin. However, it is not limited thereto.

[0031] The above-mentioned niacinamide is a functional ingredient that strengthens the skin barrier and improves skin tone as an amide form of vitamin B₃. Niacinamide promotes the synthesis of ceramide and fatty acids within the skin to inhibit moisture evaporation and protects the skin from external stimuli, thereby preventing the weakening of the skin barrier caused by dryness and damage. Furthermore, niacinamide alleviates pigmentation by inhibiting the migration of melanin to keratinocytes and improves the skin tone to be clear and even. In addition, it regulates excessive sebum secretion on the skin surface, tightens pores to refine skin texture, and can improve skin elasticity and radiance.

[0032] In one embodiment, the niacinamide may be included in an amount of 6 to 34 weight% based on the total weight of the hydrogel composition, specifically in an amount of 10 to 30 weight%. If the niacinamide is included in an amount less than 6 weight%, the concentration of the functional ingredient is insufficient, so precipitation within the hydrogel does not occur, or the change in refractive index is negligible, so a color change effect may not be realized, and sufficient functional ingredients may not be delivered to the skin, so appropriate skin improvement effects such as moisturizing effects may not be provided. On the other hand, if it is included in an amount exceeding 34 weight%, uneven precipitation may occur in a supersaturated state of the functional ingredient, resulting in a color change occurring only partially, and a decrease in usability may occur due to uneven surface formation and a heavy texture. However, it is not limited thereto.

[0033] The caffeine mentioned above is a functional ingredient that contributes to the alleviation of skin edema and the restoration of elasticity by improving blood circulation through the promotion of blood flow in the capillaries within the skin. Caffeine regulates the contraction and relaxation of blood vessels within skin tissue to facilitate the flow of stagnant blood; this improves the supply of oxygen and nutrients, thereby promoting the elimination of waste products. Through these actions, it has the effect of reducing skin swelling and providing elasticity to the skin. Furthermore, caffeine can play a role in suppressing the generation of reactive oxygen species (ROS) through its antioxidant activity and alleviating skin damage and the aging process caused by external stimuli.

[0034] In one embodiment, the caffeine may be included in an amount of 0.4 to 5 weight% based on the total weight of the hydrogel composition, specifically in an amount of 0.5 to 2.5 weight%. If the caffeine is included in an amount less than 0.4 weight%, precipitation does not occur due to the low concentration of the functional ingredient, so a color change is not realized, and the skin irritation relief effect is reduced, resulting in a user experience lacking in refreshing sensation and elasticity. On the other hand, if it is included in an amount exceeding 5 weight%, uneven precipitation occurs due to the supersaturated functional ingredient, so a color change may be observed only in some parts, and problems in use may arise, such as increased skin irritation and a rough texture. However, it is not limited thereto.

[0035] The aforementioned allantoin is a functional ingredient with excellent skin soothing and regeneration-promoting effects, playing a role in protecting skin damaged by external stimuli or environmental factors and facilitating its recovery. Allantoin increases the moisture content of the stratum corneum to keep the skin soft and supple, and improves skin condition by alleviating roughness or irritation caused by dryness. Furthermore, allantoin promotes the proliferation of epithelial cells to aid in wound healing and the regeneration of damaged skin, while stabilizing the skin to provide a soothing effect. Through these actions, it can reduce surface roughness, redness, and irritation, and maintain a soft skin condition after use.

[0036] In one embodiment, the allantoin may be included in an amount of 0.3 to 5 weight% based on the total weight of the hydrogel composition, specifically in an amount of 0.7 to 1 weight%. If the allantoin is included in an amount less than 0.3 weight%, precipitation does not occur within the hydrogel composition, so a color change cannot be observed, and the soothing effect is not sufficiently expressed, which may result in a reduced user experience. On the other hand, if it is included in an amount exceeding 5 weight%, a color change may be observed only locally due to non-uniform precipitation caused by supersaturation, and a heavy and stuffy user experience may be exhibited due to increased viscosity. However, it is not limited thereto.

[0037] The above divalent alcohol (Diol) is a low-molecular-weight alcohol having two hydroxyl groups (-OH) and is a multifunctional ingredient applied as a moisturizer, solvent, gel structure regulator, etc. in cosmetic compositions. Divalent alcohols possess structural characteristics of having both hydrophilicity and hydrophobicity, and accordingly, they help to uniformly disperse aqueous and oil phase components within the formulation and contribute to controlling the viscosity, fluidity, and adhesion of the gel matrix.

[0038] In one embodiment, the dihydric alcohol may be one or more selected from the group consisting of 1,2-hexanediol, butylene glycol, propanediol, ethylene glycol, pentylene glycol, caprylyl glycol, and dipropylene glycol; specifically, it may include at least one of 1,2-hexanediol and butylene glycol, and more specifically, one or more including butylene glycol. However, it is not limited thereto.

[0039] In one embodiment, the divalent alcohol may be included in an amount of 1 to 24 weight% based on the total weight of the hydrogel composition, specifically in an amount of 5 to 15 weight%. If the divalent alcohol is included in an amount of less than 1 weight%, the hydrogel may not be sufficiently formed, and thus the viscoelasticity of the formulation may not be secured. On the other hand, if it is included in an amount exceeding 24 weight%, problems may occur such as abnormal changes in the viscosity of the formulation due to the excessive divalent alcohol content, increased skin irritation, or a heavy sensation during use. However, it is not limited thereto.

[0040] The above triol is a highly moisturizing alcohol having three hydroxyl groups (-OH) and is an ingredient widely used as a moisturizer and texture improver in cosmetic compositions. The triol can provide a moist and soft sensation by forming a moisture film on the skin surface and inhibiting moisture evaporation, and can contribute to achieving a smooth and elastic texture by contributing to maintaining the hydration state of the gel and enhancing its structural stability. However, it is not limited thereto.

[0041] In one embodiment, the trihydric alcohol may include at least one of glycerin and 1,2,6-hexanetriol, and specifically, may include at least one of glycerin. However, it is not limited thereto.

[0042] In one embodiment, the trivalent alcohol may be included in an amount of 1 to 29 weight% based on the total weight of the hydrogel composition, specifically in an amount of 10 to 20 weight%. If the trivalent alcohol is included in an amount of less than 1 weight%, the moisture retention capacity of the formulation may be reduced, and the hydrogel may not be formed stably. On the other hand, if it is included in an amount exceeding 29 weight%, the viscosity may increase due to excessive moisture binding capacity, and a sticky and uncomfortable feeling may occur when applied to the skin, and a problem may arise where the precipitation of functional ingredients becomes uneven due to the excessive formation of the gel matrix structure. However, it is not limited thereto.

[0043] The hydrogel composition according to an embodiment of the present invention may further include one or more selected from the group consisting of monohydric alcohol, surfactant, oil, antioxidant, antifoaming agent, thickener, and preservative.

[0044] The above monohydric alcohol is a low-molecular-weight alcohol component having a single hydroxyl group, characterized by solvent properties and volatility. In addition, when the monohydric alcohol is included in the composition, it can help improve the usability of the formulation by contributing to assisting the dissolution of the component, controlling the fluidity of the formulation, and improving the initial texture.

[0045] The above surfactant is a component having an amphiphilic structure that simultaneously possesses a hydrophilic group and a hydrophobic group within its molecule, and plays a role in helping the components to be uniformly dispersed by reducing interfacial tension between substances of different polarities. In addition, when the surfactant is included in the composition, it influences physicochemical properties such as particle dispersion and stabilization, solubility assistance, viscosity control, and texture improvement, thereby contributing to improving the homogeneity and usability of the formulation.

[0046] In one embodiment, the surfactant may be one or more selected from the group consisting of Octyldodeceth-16, Polyglyceryl-10 Laurate, Sodium Laurate, PEG-60 Hydrogenated Castor Oil, Bis-PEG-15 Methyl Ether Dimethicone, Polyglyceryl-10 Oleate, Polyglyceryl-10 Myristate, and PEG-40 Hydrogenated Castor Oil. However, it is not limited thereto.

[0047] In one embodiment, the surfactant may be included in an amount of 0.1 to 10 weight% based on the total weight of the hydrogel composition, and specifically, in an amount of 1 to 8 weight%. When the surfactant is included within the above weight range, the dispersion stability of the functional ingredient is improved, and the precipitation process occurs uniformly, thereby enabling a more vivid color change effect. Additionally, the viscoelasticity and feel of the hydrogel composition are improved, providing formulation characteristics that adhere gently to the skin. However, it is not limited thereto.

[0048] The above-mentioned antioxidant is a component that has the function of inhibiting the oxidation reaction of a component in the composition, and can have a positive effect on maintaining quality for a long period by contributing to the improvement of the stability and shelf life of the formulation.

[0049] The above defoamer is a component that has the function of suppressing or removing bubbles generated during the manufacturing process, and has the characteristic of preventing excessive foam formation, and can help secure a homogeneous formulation by contributing to dispersion stability and the improvement of the appearance of the formulation.

[0050] The above-mentioned thickener is a component having a polymeric structure that increases viscosity in an aqueous or oil phase, and plays a role in providing structural stability to the formulation. It can improve the physical completeness of the formulation by contributing to viscosity control, stabilization of rheological properties, and improvement of texture upon application.

[0051] The above-mentioned preservative is a component that has the function of inhibiting the growth and reproduction of microorganisms, and can contribute to improving the safety and stability of the product by preventing spoilage and contamination during long-term storage.

[0052] In addition to the above components, the hydrogel composition according to the present invention may additionally include components included in general cosmetic compositions, such as ion chelating agents, disinfectants, pH adjusters, plant extracts, fragrances, cooling agents, additives, etc.

[0053] The amount of the above ingredients is not particularly limited and can be easily selected by a person skilled in the art within a range that does not impair the purpose and effect of the present invention.

[0055] The hydrogel composition according to an embodiment of the present invention may be a hydrogel composition characterized by a color change from transparent to milky white.

[0056] Although the above color change may vary slightly depending on the thickness and application amount of the hydrogel, it is desirable for it to occur within approximately 40 to 180 minutes from the time of use. The color change occurs as moisture migration (hydration) takes place within the hydrogel composition. Consequently, as the solubility of the functional ingredient dissolved in the hydrogel matrix gradually decreases, the functional ingredient precipitates and converts into a particle form. This causes light scattering and changes in refractive index, resulting in a change from a transparent color to a milky white color. This color change is also linked to the migration and adsorption process of the functional ingredient onto the skin surface, providing a visual confirmation effect that allows the user to visually verify the change in the composition's action.

[0057] According to another embodiment of the present invention, a hydrogel patch comprising the hydrogel composition is provided.

[0058] According to another embodiment of the present invention, a hydrogel mask pack comprising the hydrogel composition is provided.

[0059] In addition, the hydrogel composition of the present invention can be manufactured into any product conventionally produced in the art. For example, it can be manufactured into various items such as mask packs, films, gels, sheets, and patch products, but is not limited thereto.

[0061] The above hydrogel composition may be used by applying it alone or in combination with other compositions other than the present invention. In addition, the hydrogel composition according to the present invention may be used according to a conventional method of use, and the frequency of use may be varied depending on the user's skin condition or preference.

[0063] In the following, examples and comparative examples are presented to further explain the present invention in more detail, but the present invention is not limited thereto.

[0065] Experimental Example 1. Experiment to Verify the Specificity of Niacinamide Content

[0066] (1) Preparation of Examples and Comparative Examples

[0067] In order to examine whether the color change effect of the hydrogel composition according to the present invention is realized and the effect of the niacinamide content on the feel of use, examples and comparative examples were prepared with different niacinamide contents as described in Tables 1 and 2 below.

[0068]

[0070]

[0072] The unit of the component content in Tables 1 and 2 is weight%, and the specific manufacturing method is as follows.

[0073] First, the ingredients excluding the thickener were added to purified water in a batch and mixed uniformly. Then, the mixture was heated to ensure that the ingredients were completely dissolved, after which the thickener was added and stirred to prepare a hydrogel solution. Subsequently, the solution was degassed, and then the coating, perforation, and inlet processes were performed sequentially to prepare the compositions of the examples and comparative examples.

[0075] (2) Check whether color change effect is implemented

[0076] The compositions of the examples and comparative examples were applied to the faces of subjects, consisting of 10 adult men and 10 adult women, and the color of the composition was observed to determine whether the color change effect was achieved by observing whether the color of the composition changed from transparent to milky white within 180 minutes. As a result of the verification, if the color of the composition changed to milky white within 180 minutes, it was marked “O”; if the color changed only partially to milky white, it was marked “△”; and if the transparent color was maintained, it was marked “X” and recorded in Table 3 below. The results of verifying the color change effect of the compositions of the examples and comparative examples are shown in Figures 1 to 3 below.

[0078] (3) Check for signs of use

[0079] After applying the compositions of the examples and comparative examples to the faces of subjects consisting of 10 adult men and 10 adult women, the average response values ​​of the subjects regarding the sensation of use after 180 minutes were indicated in Table 3 below on a scale of 0 to 5. 0 represents the worst sensation of use, and 5 represents the best sensation of use.

[0081] (4) Experimental results

[0082]

[0084] As confirmed in Table 3 above, in the case of Examples 1 to 3 containing an appropriate amount of niacinamide, a color change from transparent to milky white was observed upon use, and the user experience also showed excellent results with a score of 4.0 or higher.

[0085] On the other hand, in the case of Comparative Example 1, which contained a small amount of niacinamide compared to the example, no color change occurred, and it still showed a transparent appearance even after use. Furthermore, as the skin improvement effect decreased, the sensation of use was measured to be low at 1.5, indicating that it was not suitable for use.

[0086] In addition, in the case of Comparative Example 2, which contained an excess amount of niacinamide compared to the example, only a partial change in color to milky white was observed, and the user experience also showed a low result value as skin adhesion decreased due to the excess of functional ingredients.

[0087] Based on the experimental results described above, it was confirmed that including niacinamide in an appropriate amount in the hydrogel composition is desirable for realizing color change effects and improving usability.

[0089] Experimental Example 2. Experiment to Verify Specificity of Caffeine Content

[0090] (1) Preparation of Examples and Comparative Examples

[0091] In order to examine whether the color change effect of the hydrogel composition according to the present invention is realized and the effect of caffeine content on the user experience, examples and comparative examples were prepared with different caffeine content as described in Tables 4 and 5 below. The unit of the component content in Tables 4 and 5 is weight%, and the preparation method is the same as in Experimental Example 1.

[0092]

[0094]

[0096] (2) Checking whether color change effects are implemented and the user experience

[0097] The color change effect and usability of each composition were verified using the same method as in Experimental Example 1 above, and the experimental results of each composition are indicated in Table 6 below.

[0098]

[0100] As confirmed in Table 6 above, in the case of Examples 4 to 7 containing an appropriate amount of caffeine, a color change from transparent to milky white was observed upon use, and the sensation of use was also excellent, with all of them scoring 4.5 or higher.

[0101] On the other hand, in the case of Comparative Example 3, which contains a small amount of caffeine compared to the example, the results of the measurement of usability were similar to those of the example; however, since no color change occurred and the appearance remained transparent even after use, it was found that it was not suitable for use.

[0102] In addition, in the case of Comparative Example 4, which contains an excessive amount of caffeine compared to the example, only a partial change in color to milky white was observed, and the irritancy increased due to the excess of functional ingredients, resulting in a low value for usability.

[0103] Based on the experimental results described above, it was confirmed that including caffeine in an appropriate amount in the hydrogel composition is desirable for realizing color change effects and improving usability.

[0105] Experimental Example 3. Experiment to Verify the Specificity of Allantoin Content

[0106] (1) Preparation of Examples and Comparative Examples

[0107] In order to examine whether the color change effect of the hydrogel composition according to the present invention is realized and the effect of the allantoin content on the feel of use, examples and comparative examples were prepared with different allantoin contents as described in Tables 7 and 8 below. The unit of the component content in Tables 7 and 8 is weight%, and the preparation method is the same as that of Experimental Example 1.

[0108]

[0110]

[0112] (2) Checking whether color change effects are implemented and the user experience

[0113] The color change effect and usability of each composition were verified using the same method as in Experimental Example 1 above, and the experimental results of each composition are indicated in Table 9 below.

[0114]

[0116] As confirmed in Table 9 above, in the case of Examples 8 to 10 containing an appropriate amount of allantoin, a color change from transparent to milky white was observed upon use, and the sensation of use was also all higher than 3.7 compared to the comparative examples.

[0117] On the other hand, in the case of Comparative Example 5, which contains a small amount of allantoin compared to the example, no color change occurred, and it still showed a transparent appearance even after use. Furthermore, the usability was measured at 2.0 due to low moisture content, indicating that it was not suitable for use.

[0118] In addition, in the case of Comparative Example 6, which contains an excess amount of allantoin compared to the example, only a partial change in color to milky white was observed, and a low sensation of use was recorded due to the heavy sensation caused by the excess of the functional ingredient.

[0119] Based on the experimental results described above, it was confirmed that including allantoin in an appropriate amount in the hydrogel composition is desirable for realizing color change effects and improving usability.

[0121] Experimental Example 4. Experiment to Verify the Specificity of Divalent Alcohol Content

[0122] (1) Preparation of comparative example

[0123] In order to examine whether the color change effect of the hydrogel composition according to the present invention is realized and the effect of the content of divalent alcohol on the feel of use, comparative examples were prepared by varying the content of divalent alcohol based on the examples, as described in Tables 10 to 12 below. The unit of the component content in Tables 10 to 12 is weight%, and the manufacturing method is the same as that of Experimental Example 1.

[0124]

[0126]

[0128]

[0130] (2) Checking whether color change effects are implemented and the user experience

[0131] The color change effect and usability of each composition were verified using the same method as in Experimental Example 1 above, and the experimental results of each composition are indicated in Tables 13 and 14 below.

[0132]

[0134]

[0136] As confirmed in Tables 13 and 14 above, in the case of Examples 1, 4, and 8 containing an appropriate amount of dihydric alcohol, a color change from transparent to milky white was observed upon use, and all showed excellent results in terms of usability.

[0137] On the other hand, in the case of Comparative Examples 7, 9, and 11, which contain a small amount of divalent alcohol compared to the example, the color change to milky white did not occur overall but was observed only locally, and the usability was also measured to be low at 2 points or less.

[0138] In addition, in the case of Comparative Examples 8, 10, and 12, which contained an excessive amount of divalent alcohol compared to the example, although a color change from transparent to milky white was partially achieved upon use, it was found that they were not suitable for use due to increased irritation and a heavy sensation caused by the excessive content of divalent alcohol.

[0139] Based on the experimental results described above, it was confirmed that including a dihydric alcohol in an appropriate amount in the hydrogel composition is desirable for realizing a color change effect and improving the user experience.

[0141] Experimental Example 4. Experiment to Verify the Specificity of Trivalent Alcohol Content

[0142] (1) Preparation of comparative example

[0143] In order to examine whether the color change effect of the hydrogel composition according to the present invention is realized and the effect of the content of trivalent alcohol on the feel of use, comparative examples were prepared by varying the content of trivalent alcohol based on the examples, as described in Tables 15 to 17 below. The unit of the component content in Tables 15 to 17 is weight%, and the manufacturing method is the same as that of Experimental Example 1.

[0144]

[0146]

[0148]

[0150] (2) Checking whether color change effects are implemented and the user experience

[0151] The color change effect and usability of each composition were verified using the same method as in Experimental Example 1 above, and the experimental results of each composition are indicated in Tables 18 and 19 below.

[0152]

[0154]

[0156] As confirmed in Tables 18 and 19 above, in the case of Examples 1, 4, and 8 containing an appropriate amount of trivalent alcohol, a color change from transparent to milky white was observed upon use, and all showed excellent results in terms of usability.

[0157] On the other hand, in the case of Comparative Examples 13, 15, and 17, which contain a small amount of trivalent alcohol compared to the example, it was confirmed that a color change to milky white was achieved only in some parts, and it was found that the usability also showed low results.

[0158] In addition, in the case of Comparative Examples 14, 16, and 18, which contained an excessive amount of trivalent alcohol compared to the example, although a color change from transparent to milky white was achieved during use, it was found that they were not suitable for use as the viscosity increased excessively due to the excessive content of trivalent alcohol, resulting in a deterioration in usability.

[0159] Based on the experimental results described above, it was confirmed that including trivalent alcohol in an appropriate amount in the hydrogel composition is desirable for realizing color change effects and improving usability.

[0161] Foregoing, specific parts of the content of the present invention have been described in detail. It will be apparent to those skilled in the art that such specific descriptions are merely preferred embodiments and do not limit the scope of the present invention. Accordingly, the actual scope of the present invention is defined by the appended claims and their equivalents.

Claims

Claim 1 A hydrogel composition characterized by a color change from transparent to milky white, comprising an active ingredient, a dihydric alcohol, and a trihydric alcohol, wherein the active ingredient comprises one or more selected from the group consisting of niacinamide, caffeine, and allantoin, wherein the niacinamide is included in an amount of 6 to 34 weight% based on the total weight of the hydrogel composition, the caffeine is included in an amount of 0.4 to 5 weight% based on the total weight of the hydrogel composition, the allantoin is included in an amount of 0.3 to 5 weight% based on the total weight of the hydrogel composition, and the dihydric alcohol comprises 1,2-hexanediol, butylene glycol, propanediol, ethylene glycol, A hydrogel composition comprising at least one selected from the group consisting of pentylene glycol, caprylyl glycol, and dipropylene glycol in an amount of 1 to 24 weight% based on the total weight of the hydrogel composition, wherein the trihydric alcohol comprises at least one selected from glycerin and 1,2,6-hexanetriol in an amount of 1 to 29 weight% based on the total weight of the hydrogel composition. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 delete Claim 7 delete Claim 8 delete Claim 9 delete Claim 10 The hydrogel composition of claim 1, wherein the hydrogel composition further comprises one or more selected from the group consisting of monohydric alcohol, surfactant, oil, antioxidant, antifoaming agent, thickening agent, and preservative. Claim 11 delete Claim 12 A hydrogel patch comprising a hydrogel composition according to either claim 1 or claim 10. Claim 13 A hydrogel mask pack comprising a hydrogel composition according to either claim 1 or claim 10.

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