Oil-in-water (O / W) cosmetic composition comprising agarose

Abstract

The oil-in-water (O / W) cosmetic composition of the present invention achieves excellent elasticity and sufficient hardness through an optimal combination of an elastic thickener and a co-thickener containing agarose, making it suitable for molding into shapes such as sticks. Therefore, it provides an excellent user experience and the formulation does not disintegrate during application, making it convenient to use.

Description

Technical Field

[0001] This invention relates to an oil-in-water (O / W) cosmetic composition containing agarose, and more specifically, to an oil-in-water (O / W) formulation cosmetic composition that, through an optimal combination of agarose and an auxiliary thickener, achieves sufficient hardness, making it suitable for preparation into a stick form and providing a unique user experience. Background Technology

[0002] Stick-shaped cosmetics are convenient to carry and easy to use without the need for additional tools, making them one of the most widely used cosmetic types, regardless of age or gender. However, stick-shaped cosmetics typically pose a risk of shattering when applied to the skin, thus requiring sufficient rigidity. Therefore, cosmetic compositions used in stick-shaped cosmetics employ oil-dispersant or water-in-oil formulations suitable for achieving this rigidity.

[0003] Unlike oil-dispersible or water-in-oil formulations, oil-in-water formulations have a low oiliness, providing a refreshing and cooling sensation. In particular, due to their low oil content, they are suitable for oily or acne-prone skin. However, they are not only difficult to prepare into stick form, but even if they can be prepared into stick form, there are technical challenges in achieving the right firmness for application to the skin.

[0004] Therefore, there is an urgent need to develop a water-in-oil emulsion formulation with sufficient hardness to enable its formulation as a stick. If the convenience advantages of stick formulations can be stably applied to water-in-oil emulsion cosmetic compositions, people with oily or sensitive skin types can also conveniently use stick cosmetics. Furthermore, a wider variety of functional cosmetics can be prepared in stick form, thus providing consumers with a broader range of product choices to meet their needs.

[0005] Accordingly, the inventors of this invention used agarose as an elastic thickener and combined it in an optimal way with an auxiliary thickener to achieve an oil-in-water (O / W) formulation cosmetic composition. The cosmetic composition has a hardness suitable for a stick form and provides an excellent user experience due to its unique elasticity, thus completing this invention. Summary of the Invention

[0006] The problem the invention aims to solve The purpose of this invention is to provide a water-in-oil (O / W) formulation of a cosmetic composition, which has sufficient hardness to be suitable for preparation into a stick form and has a unique user experience.

[0007] The technical problems of this invention are not limited to those mentioned above, and those skilled in the art will clearly understand other technical problems not mentioned from the following description.

[0008] means for solving problems According to an embodiment of the present invention, an oil-in-water (O / W) cosmetic composition is provided, comprising an elastic thickener and an auxiliary thickener, wherein the elastic thickener comprises agarose.

[0009] Invention Effects The water-in-oil cosmetic composition of the present invention can form sufficient hardness, thus making it suitable for molding into rods or the like, and the formulation can remain stable without disintegrating when applied to the skin.

[0010] In addition, the cosmetic composition has excellent elasticity, thus providing a superior user experience due to its elasticity.

[0011] In addition, the cosmetic composition has a low water separation rate, thus exhibiting excellent long-term storage stability and superior marketability.

[0012] In addition, the cosmetic composition has a low melting temperature, which easily improves its fluidity, making it suitable for molding into the desired form. Attached Figure Description

[0013] To provide a fuller understanding of the accompanying drawings referenced in the detailed description of the invention, a brief description of each drawing is provided.

[0014] Figure 1 A photograph of Example 1 is shown. Detailed Implementation

[0015] According to an embodiment of the present invention, an oil-in-water (O / W) cosmetic composition is provided, comprising an elastic thickener and an auxiliary thickener, wherein the elastic thickener comprises agarose.

[0016] Additionally, the thickening agent may include carrageenan and Amorphophallus Konjac Root Extract.

[0017] In addition, based on the total weight of the water-in-oil cosmetic composition, it may contain 0.7% to 2.0% by weight of the agarose.

[0018] In addition, based on the total weight of the oil-in-water cosmetic composition, it may contain 0.05% to 0.4% by weight of the carrageenan.

[0019] In addition, based on the total weight of the water-in-oil cosmetic composition, it may contain 0.05% to 0.15% by weight of the konjac root extract.

[0020] In addition, the water-in-oil cosmetic composition may also contain a UV protectant.

[0021] In addition, the water-in-oil cosmetic composition can be semi-solid.

[0022] In addition, the water-in-oil cosmetic composition can be an elastic gel formulation.

[0023] In addition, the water-in-oil cosmetic composition can be a stick-shaped cosmetic composition. Specific Implementation Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Generally, the nomenclature used in this specification is well-known and conventionally used in this art. Furthermore, in describing embodiments of the invention, detailed descriptions of related well-known structures or functions will be omitted when it is determined that such detailed descriptions would hinder understanding of the embodiments. Additionally, embodiments of the invention will be described below, but the technical concept of the 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 referred to as "containing" a certain component, unless specifically stated otherwise, it means that other components may also be included, and does not exclude other components. In this specification, the term "and / or" includes a combination of multiple related items or any one of multiple related items.

[0026] According to embodiments of the present invention, an oil-in-water (O / W) cosmetic composition is provided, comprising an elastic thickener and an auxiliary thickener, wherein the elastic thickener comprises agarose. The O / W cosmetic composition of the present invention has sufficient hardness and a low melting temperature, and its flowability is easily adjusted, making it very suitable for molding into rods or other forms. Furthermore, due to its unique elasticity, the O / W cosmetic composition provides users with an excellent user experience when applied to the skin, due to its superior elasticity and spreadability.

[0027] Agarose is a natural polysaccharide extracted from seaweed. It is a linear polymer composed of disaccharide monomers containing D-galactose and 3,6-anhydro-L-galactose. The chain-like agarose can form a double helix structure through hydrogen bonding and is stabilized through hydrogen bonding and van der Waals forces. Specifically, in this invention, agarose acts as an elastic thickener, imparting elasticity to oil-in-water cosmetic compositions. Furthermore, the agarose chains can form a three-dimensional network structure in gel formulations, thereby stabilizing the dosage form of the cosmetic composition.

[0028] In one embodiment, based on the total weight of the oil-in-water cosmetic composition, it may contain 0.7% to 2.0% agarose, specifically 1.0% to 2.0% by weight, and more specifically, 1.0% to 1.5% by weight. When the agarose content is less than 0.7% by weight, the long-term stability of the oil-in-water cosmetic composition dosage form may decrease; when the content exceeds 2.0% by weight, its melting temperature increases, leading to difficulties in flowability adjustment.

[0029] In this specification, "melting temperature" refers to the temperature at which the gel begins to melt and soften. At a low melting temperature, it is easier to ensure the fluidity of the composition, thus making it suitable for molding.

[0030] In this invention, the auxiliary thickener can improve the stability of the dosage form and the user experience. Specifically, it can improve the long-term stability of the oil-in-water cosmetic composition by reducing water separation and / or maintaining the hardness of the oil-in-water cosmetic composition, thereby improving its commercialability. Based on agarose as an elastic thickener, the inventors derived the optimal combination of agarose and auxiliary thickeners to obtain an oil-in-water cosmetic composition that exhibits excellent elasticity, improves processability by ensuring fluidity, and also possesses excellent long-term stability.

[0031] In this specification, "water separation phenomenon" refers to the phenomenon that as water-containing gels shrink over time, the network structure shrinks, releasing the water and other solvents contained within the gel.

[0032] In one embodiment, the auxiliary thickener may include carrageenan and Amorphophallus Konjac Root Extract. When both of these components are included as auxiliary thickeners, a water-in-oil cosmetic composition with superior elasticity and / or firmness can be obtained.

[0033] In one embodiment, based on the total weight of the water-in-oil cosmetic composition, it may contain 0.05% to 0.4% by weight of carrageenan, specifically 0.05% to 0.3% by weight, and more specifically, 0.2% to 0.3% by weight. When the carrageenan content is less than 0.05% by weight, water separation is aggravated, which may lead to increased water loss over time. When the content exceeds 0.4% by weight, elasticity or spreadability is reduced, resulting in a poor user experience.

[0034] In one embodiment, based on the total weight of the water-in-oil cosmetic composition, it may contain 0.05% to 0.15% by weight of konjac root extract, specifically, 0.05% to 0.12% by weight, and more specifically, 0.07% to 0.12% by weight. When the content of the konjac root extract is less than 0.05% by weight, the melting temperature increases, which may reduce processability; when the content exceeds 0.15% by weight, the long-term stability of the dosage form may be reduced.

[0035] In one embodiment, the water-in-oil cosmetic composition of the present invention may further comprise a UV protectant. The UV protectant may comprise organic UV protectants, inorganic UV protectants, and / or organic / inorganic compound UV protectants available to those skilled in the art. Examples of such UV-protective agents include ethylhexyl triazone, diethylaminohydroxybenzoyl hexyl benzyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl methoxycinnamate, ethylhexyl salicylate, octocrylene, diethylhexyl butamido triazone, homosalate, isoamyl p-methoxycinnamate, polysilicone-15, and methylene bis-benzotriazolyl tetramethylbutylphenol. At least one of the following: tetramethylbutylphenol, tris-biphenyl triazine, phenylbenzimidazole sulfonic acid, terephthalylidene dicamphor sulfonic acid, titanium dioxide, bis-ethylhexyloxyphenol methoxyphenyl triazine, and zinc oxide. However, it is not limited to these and may contain a variety of UV-protective agents.

[0036] In one embodiment, the water-in-oil cosmetic composition of the present invention may further comprise purified water, polyols, oils, surfactants, humectants, preservatives, or functional ingredients.

[0037] In one embodiment, the oil can give the rod-shaped cosmetic composition a firmness and provide a pleasant feel and moisturizing sensation. Examples of the oil may include dibutyl adipate, octyl-dodecyl alcohol, caprylic / capric / succinic acid triglyceride, glyceryl caprylate, coconut oil-caprylate / capric acid ester, butyl octyl salicylate, and sunflower seed oil, etc. However, it is not limited to these.

[0038] In one embodiment, the powder may be used to adjust hardness or as a building agent. Examples of the powder may include silica, synthetic fluorophlogopite, methyl methacrylate crosspolymer, etc. However, it is not limited to these.

[0039] In one embodiment, the surfactant can act as a stabilizer for the emulsion formulation. Examples of the surfactant may include polyglycerol-6 polyricinoleate, polyglycerol-4 diisostearate / polyhydroxystearate / sebacic acid ester, cetyl PEG / PPG-10 / 1 polydimethylsiloxane, and lauryl polyglycerol-3 polydimethylsiloxane*tocopherol, etc. However, it is not limited to these.

[0040] In one embodiment, the moisturizer can provide or retain moisture to the skin and provide a lasting moisturizing sensation. Examples of the moisturizer may include, but are not limited to, caprylyl glycol, butylene glycol, dipropylene glycol, methyl propylene glycol, pentylene glycol, glyceryl polyether-26, sorbitol, diglycerides, etc.

[0041] In one embodiment, the preservative is used to improve preservation, and for example, ethylhexylglycerin, 1,2-hexanediol, etc., may be used, but are not limited thereto.

[0042] In one embodiment, the functional ingredient may be a mixture of multiple ingredients depending on the purpose of the cosmetic composition. For example, it may include anti-wrinkle agents, whitening functional ingredients, pigmentation functional ingredients, skin soothing functional ingredients, and sebum or pore care functional ingredients.

[0043] In one embodiment, the water-in-oil cosmetic composition of the present invention may further include pigments. Pigments may be appropriately compounded according to the intended use to adjust the hue of the water-in-oil cosmetic composition.

[0044] In addition, the water-in-oil cosmetic composition of the present invention may also contain ingredients contained in conventional cosmetic compositions, such as waxes, powders, emulsion stabilizers, skin conditioning agents, ion chelating agents, bactericides, pH adjusters, antioxidants, alcohols, plant extracts, fragrances, and user experience modifiers.

[0045] There are no particular limitations on the amount of the above-mentioned components, and they can be easily selected by those skilled in the art without impairing the purpose and effect of the present invention.

[0046] In one embodiment, the water-in-oil cosmetic composition of the present invention can be provided in other dosage forms that include an oil-in-water (O / W) formulation. For example, it can be provided in multiple emulsion formulations (O / W / O or W / O / W, etc.), creams, foams, etc.

[0047] In one embodiment, the water-in-oil cosmetic composition of the present invention can be provided in a stick form. The water-in-oil cosmetic composition exhibits sufficient hardness, excellent elasticity, and a low melting temperature, thereby easily adjusting its flowability and possessing excellent long-term stability. Therefore, it is easy to fill into containers (e.g., stick form) and maintains its excellent quality for a long time. Furthermore, the stick form facilitates the storage and use of the water-in-oil cosmetic composition. For example, it can be formulated as sunscreen sticks, sunscreen creams, lipsticks, lip balms, lip glosses, multi-purpose balms, foundations, lip creams, and concealers, among other cosmetics.

[0048] In one specific embodiment, the water-in-oil cosmetic composition of the present invention can be an elastic gel formulation. In the gel formulation, agarose can form a gel network through hydrogen bonds and / or van der Waals forces, and obtain elasticity from the resilience of the gel network, etc. Therefore, when the cosmetic composition is applied to the skin, it provides the user with a unique feel due to its elasticity, and has a highly elastic appearance similar to a gel, thus providing consumers with aesthetic appeal from a formulation perspective.

[0049] In one embodiment, the water-in-oil cosmetic composition of the present invention can be prepared into a semi-solid state by means of its unique elasticity and stability over time. By being prepared into the semi-solid state, it has the hardness required to maintain its shape, and its shape can change according to changes in pressure or temperature.

[0050] In one embodiment, the water-in-oil cosmetic composition of the present invention can be a stick-shaped cosmetic composition for UV protection. For example, the water-in-oil cosmetic composition of the present invention can be provided in the form of sunscreen sticks, sunscreen creams, etc.

[0051] In one specific embodiment, the water-in-oil cosmetic composition of the present invention can be provided in a semi-solid form within a sunscreen stick product. When applied to the sunscreen stick product, the formulation does not disintegrate, providing a unique user experience due to its elasticity. Its gel-like appearance can stimulate the user's aesthetic curiosity or sense of satisfaction.

[0052] The following will show embodiments and experimental examples for more specific illustration of the present invention, but the present invention is not limited thereto.

[0053] Experimental Example 1. Comparative Experiment Based on Thickener Combinations (1) Preparation of Examples and Comparative Examples To realize the water-in-oil cosmetic composition of the present invention, examples and comparative examples of gel-type sticks were prepared, as shown in Table 1 below, to compare the effects of containing or not containing a specific thickener. The contents in Table 1 below are by weight%.

[0054] Table 1

[0055] The specific preparation method is as follows.

[0056] The components of phase A (aqueous phase) were heated to above 80°C and then mixed thoroughly by stirring. The components of phase B (oil phase) were heated to 90°C and then mixed thoroughly by stirring. Phase B was slowly added to the thoroughly stirred phase A, and the mixture was homogenized for 5 minutes at 95°C using a homogenizer. The emulsified mixture was then filled into a rubber mold, cooled to room temperature, and the solidified contents were filled into rod-shaped containers to complete the examples and comparative examples.

[0057] (2) Evaluation of physical properties The physical properties of the examples and comparative examples prepared according to the components and contents shown in Table 1 were evaluated. Specifically, flowability, water separation rate, and formulation stability were evaluated.

[0058] Regarding flowability, 100g of the examples and comparative examples were placed at 90°C for 30 minutes, and the flowability of the examples and comparative examples was evaluated by tilting the container. After 30 minutes, if no lumps formed in the sample, the flowability was evaluated as "excellent," indicating easy molding and a low melting temperature. If some lumps formed in the sample, the flowability was evaluated as "moderate," indicating that although molding was possible, the defect rate was significant and the melting temperature was not low. If a large number of lumps formed in the sample, the flowability was evaluated as "poor," indicating that molding itself was difficult and the melting temperature was high. If the flowability lasted for a long time, the melting temperature was low. If the melting temperature was moderate, the flowability of the contents was suitable for filling the container. If the flowability lasted for a short time, the melting temperature was high, and the sample was evaluated as unsuitable for filling due to insufficient flowability.

[0059] Regarding the syneresis rate, the examples and comparative examples were left for 30 days, and the degree of syneresis was measured and calculated according to the following mathematical formula.

[0060]

[0061] A water separation rate below 10% is rated as "low," a water separation rate between 10% and 15% is rated as "average," and a water separation rate above 15% is rated as "poor." A lower water separation rate means less water is lost over time; therefore, a lower water separation rate indicates better physical properties.

[0062] Regarding the evaluation of dosage form stability, the examples and comparative examples were placed at low temperature (5°C), normal temperature (25°C), and high temperature (40°C) for 30 days, and the degree of change in needle penetration was measured. The degree of deformation of the dosage form observed by the naked eye and whether the dosage form disintegrated when applied to the skin were comprehensively evaluated. As for the needle penetration, a hardness tester was used, and the test was conducted with a needle with a diameter of 1 mm at a speed of 30 cm / min and a depth of 10 mm.

[0063] The evaluation results obtained through the experimental method are shown in Table 2 below.

[0064] (3) Sensory evaluation Sensory evaluations were conducted on the examples and comparative examples prepared according to the ingredients and contents shown in Table 1. Specifically, the examples and comparative examples were applied to the entire left arm of 10 professional reviewers, and three aspects—elasticity, cooling sensation, and spreadability—were evaluated on a scale of 5. The closer the score for each item was to 5, the better.

[0065] In terms of elasticity, the evaluation mainly focuses on whether the elasticity of the formulation is fully felt during the application process, and whether the composition adheres strongly to the skin. In terms of cooling sensation, the evaluation mainly focuses on whether the application area feels sufficiently moisturized. In terms of spreadability, the evaluation mainly focuses on whether the application is smooth (without dryness or pilling).

[0066] The evaluation results obtained through the evaluation method are shown in Table 2 below. Figure 1 A photograph of Example 1 is shown.

[0067] Table 2

[0068] According to Table 2, in Example 1, which included agarose as an elastic thickener, carrageenan as a co-thickening agent, and konjac root extract in appropriate amounts, a low water separation rate of less than 10% and excellent dosage form stability were observed, confirming the excellent long-term stability of the oil-in-water composition. Furthermore, the low melting temperature and high fluidity made it easy to mold (fill into containers, etc.). Moreover, as... Figure 1 As shown in the photographs, the product exhibits excellent elasticity, resulting in a unique user experience. It also demonstrates excellent spreadability and maintains the superior cooling sensation characteristic of oil-in-water formulations. Conversely, according to Comparative Examples 1 to 4, which contain only agarose and no auxiliary thickener, it was confirmed that the higher the content of the elastic thickener, the better the elasticity and the better the water separation rate. However, as seen in Comparative Examples 1 and 2, the fluidity was extremely poor, to the point of being unable to form properly. During application, partial breakage of the formulation occurred, confirming that the stability was also worse than when using an auxiliary thickener. Regarding Comparative Examples 5 and 6, which do not contain any of the auxiliary thickeners, compared to the examples, it was confirmed that the penetration increased significantly after storage, the formulation stability was poor, the fluidity decreased, or the water separation rate was high, leading to reduced marketability. In particular, regarding Comparative Example 7, which does not contain agarose, it was confirmed that the formulation completely disintegrated upon application, exhibiting extremely poor formulation stability to the point that it could not be applied, failing to provide any elasticity, exhibiting extremely poor spreadability, and failing to achieve a cooling sensation.

[0069] Therefore, it is confirmed that for the water-in-oil cosmetic compositions of the present invention, the inclusion of specific elastic thickeners and auxiliary thickeners is an important component.

[0070] Experimental Example 2. Comparison Experiment Based on Thickener Content (1) Preparation of comparative examples In this invention, to determine the optimal content of the elastic thickener and auxiliary thickener, comparative examples were prepared using the same preparation method as in Experimental Example 1, as shown in Table 3 below. Specifically, based on Example 1, the content of any one of the three thickeners was changed, while other components and their contents remained the same. The units in Table 3 are by weight%.

[0071] Table 3

[0072] (2) Evaluation of physical properties For the comparative examples prepared according to the components and contents shown in Table 3, the physical properties were evaluated using the same method as in Experimental Example 1, and the results are shown in Table 4 below.

[0073] (3) Sensory evaluation For the comparative examples prepared according to the ingredients and contents shown in Table 3, sensory evaluation was performed using the same method as in Experimental Example 1, and the results are shown in Table 4 below.

[0074] Table 4

[0075] According to Table 4, in Comparative Example 8, where the content of konjac root extract as an auxiliary thickener was lower than an appropriate amount, slightly poor flowability and dosage form stability were observed. In Comparative Example 9, where the content of konjac root extract was higher than an appropriate amount, poor dosage form stability was observed. Then, in Comparative Example 10, where the content of carrageenan as an auxiliary thickener was lower than an appropriate amount, water separation was observed to be more severe than in the previous examples, and marketability decreased over time. In Comparative Example 11, where the carrageenan content was excessive, good physical properties such as water separation rate and flowability were observed, but elasticity, spreadability, and a lack of cooling sensation were observed. In Comparative Example 12, where the agarose content was lower than an appropriate amount, dosage form deterioration and disintegration were observed, indicating extremely poor dosage form stability and very low scores in all three sensory evaluations, confirming significantly insufficient elasticity. In Comparative Example 13, where the agarose content exceeded an appropriate amount, poor flowability, difficulty in forming, and slightly insufficient spreadability were observed.

[0076] Therefore, it is confirmed that, for the water-in-oil type cosmetic composition of the present invention, including a specific elastic thickener and an auxiliary thickener in appropriate amounts is an important component.

[0077] The foregoing has described in detail specific parts of the present invention. It will be apparent to those skilled in the art that this specific description is merely a preferred embodiment, and the scope of the present invention is not limited thereto. Therefore, the essential scope of the present invention will be defined by the appended claims and their equivalents.

Claims

1. A water-in-oil cosmetic composition, characterized in that, Includes elastic thickeners and auxiliary thickeners. The elastic thickener contains agarose.

2. The water-in-oil cosmetic composition according to claim 1, characterized in that, The auxiliary thickener includes carrageenan and konjac root extract.

3. The water-in-oil cosmetic composition according to claim 1, characterized in that, Based on the total weight of the oil-in-water cosmetic composition, it contains 0.7% to 2.0% by weight of the agarose.

4. The water-in-oil cosmetic composition according to claim 2, characterized in that, Based on the total weight of the oil-in-water cosmetic composition, it contains 0.05% to 0.4% by weight of the carrageenan.

5. The water-in-oil cosmetic composition according to claim 2, characterized in that, Based on the total weight of the water-in-oil cosmetic composition, it contains 0.05% to 0.15% by weight of the konjac root extract.

6. The water-in-oil cosmetic composition according to claim 1, characterized in that, The water-in-oil cosmetic composition also contains a UV protectant.

7. The water-in-oil cosmetic composition according to claim 1, characterized in that, The water-in-oil cosmetic composition is semi-solid.

8. The water-in-oil cosmetic composition according to claim 1, characterized in that, The water-in-oil cosmetic composition is an elastic gel formulation.

9. The water-in-oil cosmetic composition according to claim 1, characterized in that, The water-in-oil cosmetic composition is a stick-shaped cosmetic composition.

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