Cosmetic Composition for UV Protection Having Enhanced Formulation Stability

Abstract

The present invention relates to a UV blocking composition with excellent formulation stability, and more specifically, to a composition that includes sorbitan isostearate and polysorbate 60 together with a highly polar organic UV blocking ingredient, thereby providing excellent formulation stability and reduced irritation without the problem of precipitation of the UV blocking ingredient within the formulation.

Description

Technology Field

[0001] The present invention relates to a UV blocking composition with excellent formulation stability, and more specifically, to a composition that includes sorbitan isostearate and polysorbate 60 together with a highly polar organic UV blocking ingredient, thereby providing excellent formulation stability and reduced irritation without the problem of precipitation of the UV blocking ingredient within the formulation. Background Technology

[0002] In general, it is important to use sunscreens in makeup products that do not leave a white cast to avoid affecting skin tone. Accordingly, most makeup products primarily use organic sunscreens that provide transparent UV protection with minimal color change.

[0003] In particular, for lip makeup products such as lipsticks and lip balms, color and pigmentation are important characteristics, so organic sunscreens that produce less white cast have been preferred over inorganic sunscreens. In fact, most SPF functional lip products released in the past have been manufactured using organic sunscreens, and it is highly likely that future development will continue to increase the content of organic sunscreen ingredients to enhance UV protection efficacy.

[0004] However, while organic sunscreen ingredients are highly polar substances, the main components of lip products consist of non-polar raw materials such as oils and waxes, which presents a problem of low compatibility between the two ingredients. Consequently, when organic sunscreens are applied at high concentrations in a formulation, even if a high SPF value is measured initially, the stability of the formulation deteriorates over time, and precipitation of the sunscreen frequently occurs. This not only reduces the product's SPF value and UV protection efficacy but also compromises the physical stability of the formulation, leading to reduced usability or lip irritation for the user, which presents limitations that lower consumer satisfaction.

[0005] The present invention aims to solve these technical problems by including sorbitan isostearate and polysorbate 60 together with a highly polar organic UV blocking ingredient. It was confirmed that by including these ingredients, formulation stability can be improved without the problem of precipitation of the UV blocking ingredient within the formulation, and irritation can be reduced to maintain an excellent user experience, thereby completing the present invention. Prior art literature

[0006] Korean Registered Patent Publication No. 10-2686666 The problem to be solved

[0007] The present invention aims to provide a cosmetic composition for sunscreen comprising an organic sunscreen component and an optimal combination of emulsifiers.

[0008] 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

[0009] According to an embodiment of the present invention, a cosmetic composition for UV protection is provided, comprising an organic UV blocking component, sorbitan isostearate, and polysorbate 60.

[0010] In addition, the above organic UV blocking ingredient may be one or more selected from the group consisting of bis-ethylhexyloxyphenol methoxyphenyl triazine and ethylhexyl triazone.

[0011] In addition, the sorbitan isostearate may be included in an amount of 1 to 8 weight percent based on the total weight of the composition.

[0012] In addition, the polysorbate 60 may be included in an amount of 1 to 8 weight percent based on the total weight of the composition.

[0013] In addition, the sorbitan isostearate and polysorbate 60 may be included in a weight ratio of 1:0.5 to 1.5.

[0014] In addition, the above cosmetic composition may be for lips. Effects of the invention

[0015] The composition according to the present invention contains a high content of a highly polar organic UV-blocking ingredient and optimally incorporates the emulsifiers sorbitan isostearate and polysorbate 60, thereby improving formulation stability without precipitation of the UV-blocking ingredient within the formulation and possessing excellent transparency. Furthermore, the composition according to the present invention has the effect of reducing irritation, maintaining a smooth and soft user experience while being hypoallergenic. Specific details for implementing the invention

[0016] 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.

[0017] 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.

[0019] According to an embodiment of the present invention, a cosmetic composition for UV protection is provided, comprising an organic UV blocking component, sorbitan isostearate, and polysorbate 60.

[0020] The cosmetic composition for sunscreen according to the present invention is characterized by including sorbitan isostearate and polysorbate 60 together with an organic sunscreen ingredient, thereby resolving the problems that occur when applying high concentrations of existing highly polar sunscreen ingredients, such as precipitation within the formulation, a decrease in SPF value resulting from this, and a decline in usability due to irritation.

[0021] In the present invention, the organic ultraviolet blocking component may be one or more selected from the group consisting of bis-ethylhexyloxyphenol methoxyphenyl triazine and ethylhexyl triazone, and, for example, may include both bis-ethylhexyloxyphenol methoxyphenyl triazine and ethylhexyl triazone, but is not limited thereto.

[0022] The above-mentioned bis-ethylhexyloxyphenol methoxyphenyl triazine is an aromatic triazine compound that acts as a blocker for ultraviolet A and ultraviolet B rays, has a wide range of ultraviolet absorption, excellent photostability, and high polarity.

[0023] The above ethylhexyl triazone is a sunscreen with very high UVB blocking efficiency and is a triazone-based compound with very high polarity.

[0024] The above organic UV blocking ingredient may be included in an amount of 5 to 30 weight% based on the total weight of the composition, but is not limited thereto. Specifically, the bis-ethylhexyloxyphenol methoxyphenyl triazine may be included in an amount of 3 to 20 weight% based on the total weight of the composition, and the ethylhexyl triazone may be included in an amount of 1 to 10 weight% based on the total weight of the composition, but is not limited thereto.

[0025] In the present invention, the sorbitan isostearate is a substance obtained by the esterification reaction of sorbitol and isostearic acid, and is a nonionic surfactant. The sorbitan isostearate may be included in an amount of 1 to 8 weight% based on the total weight of the composition, specifically 2 to 7 weight%, and more specifically 3 to 5 weight%, but is not limited thereto. If the content of the sorbitan isostearate is less than 1 weight%, it does not affect the formulation stability of the highly polar organic UV blocking ingredient, resulting in precipitation within the formulation; if it exceeds 8 weight%, there is a problem of reduced viscosity and reduced usability.

[0026] In the present invention, the polysorbate 60 is a nonionic surfactant to which ethylene oxide is added to sorbitan monostearate. The polysorbate 60 may be included in an amount of 1 to 8 weight% based on the total weight of the composition, specifically 2 to 7 weight%, and more specifically 3 to 5 weight%, but is not limited thereto. If the content of the polysorbate 60 is less than 1 weight%, it does not affect the formulation stability of the highly polar organic UV blocking ingredient, resulting in precipitation within the formulation; if it exceeds 8 weight%, the formulation has a strong emulsifier feel, which reduces usability and increases the unit cost of the formulation.

[0027] The above sorbitan isostearate and polysorbate 60 may be included in a weight ratio of 1:0.5 to 1.5, and when included within the above weight ratio range, high transparency can be achieved with optimal efficiency. For example, if the content of polysorbate 60 relative to sorbitan isostearate is higher than the above weight ratio, transparency does not increase beyond a certain level, making the addition of an excessive amount ineffective, and it may be difficult to apply other additional ingredients, which may result in difficulties in achieving a pleasant user experience.

[0028] As described above, the cosmetic composition according to the present invention optimally comprises sorbitan isostearate and polysorbate 60, thereby enabling the uniform dispersion of highly polar organic UV-blocking ingredients within non-polar substances such as oils or waxes. Consequently, it prevents the precipitation of UV-blocking ingredients within the formulation and improves long-term formulation stability, thereby serving to achieve excellent usability and UV-blocking effects. Specifically, if only sorbitan isostearate or polysorbate 60 is included, or if other emulsifiers, such as cetyl PEG / PPG-10 / 1 dimethicone or sorbitan sesquioleate, are used, the desired formulation stability is not achieved, resulting in precipitation, settling, or an opaque appearance.

[0029] Accordingly, the cosmetic composition of the present invention exhibits excellent formulation stability over a wide range of temperatures, more specifically at low temperatures (e.g., about 5°C), room temperatures (e.g., about 25°C), and high temperatures (e.g., about 40 to 50°C), and is characterized by high transparency of the formulation.

[0030] The cosmetic composition according to the present invention may be for lips.

[0031] The above cosmetic composition may further include oil and an oil binder.

[0032] The above cosmetic composition may further include any conventional cosmetic ingredient selected from additional ingredients commonly used in cosmetics, such as thickeners, emulsifiers, dispersants, humectants, fragrances, fillers, preservatives, antiseptics, neutralizing agents, sweeteners, vitamins, free-radical scavengers, metal ion chelating agents, functional ingredients, and mixtures thereof. A person skilled in the art may select any additional ingredient and / or the amount thereof so that the advantageous properties of the composition according to this specification are not adversely affected or are substantially affected by the expected addition.

[0033] The cosmetic composition according to the present invention may be prepared in any one formulation selected from the group consisting of cream, essence, lotion, stick, balm, gel, milk, serum, mousse, aerosol, and spray, but is not limited thereto. In particular, when the cosmetic composition according to the present invention is a cosmetic composition for lips, it may be prepared as a lipstick, lip gloss, lip balm, or lip cream, but is not limited thereto.

[0034] The above cosmetic composition may be used by applying it alone or in combination, or by applying it in combination with other cosmetic compositions other than the present invention. In addition, the cosmetic composition according to the present invention may be used according to conventional methods of use, and the frequency of use may be varied depending on the user's skin condition or preference.

[0036] In the following, examples and experimental examples are presented to further explain the present invention in more detail, but the present invention is not limited thereto.

[0038] [Preparation Example]

[0039] Example 1. Preparation of a UV-blocking composition

[0040] A UV-blocking composition was prepared comprising sorbitan isostearate and polysorbate 60, along with bis-ethylhexyloxyphenol methoxyphenyl triazine and ethylhexyl triazone, which are highly polar organic UV-blocking ingredients used as UV-blockers. The specific ingredients are shown in Table 1, and the unit of the ingredient content in Table 1 is weight%.

[0041]

[0042] Specifically, two types of powdered sunscreens were dissolved in an oil binder (dibutyl adipate) heated to 90°C, then added to a mixer and stirred at 700 rpm. Once complete dissolution of the powder dispersion was confirmed, a non-polar oil binder, a preservative, and an emulsifier were added and dispersed to prepare the cosmetic composition of Example 1.

[0044] [Experimental Example]

[0045] Experimental Example 1. Comparison of Effects According to Type of Emulsifier

[0046] 1-1. Preparation of Comparative Examples 1 to 6

[0047] Based on the components of Example 1, compositions of Comparative Examples 1 to 6 were prepared in the same manner, each containing 3 to 10 weight% of either Cetyl PEG / PPG-10 / 1 Dimethicone or Sorbitan Sesquioleate as an emulsifier, instead of Sorbitan Isostearate and Polysorbate 60. The modified content in the composition was replaced with Diglyceryl Triisostearate, an oil binder, while the other components were the same as in Example 1. Specific information is shown in Table 2, and the unit of the component content in Table 2 is weight%.

[0048]

[0049] 1-2. Evaluation of Formulation Stability

[0050] The formulation stability of the cosmetic compositions according to Example 1 and Comparative Examples 1 to 6 was evaluated. Specifically, each composition was placed in a transparent container and observed after being stored for two months in an incubator at various temperatures (cycle conditions where the temperature changes from 25℃, 5℃, 40℃, 50℃, to 5 to 40℃). It was marked as O if the formulation stability was excellent without any precipitation or settling, and X if there were problems with formulation stability, such as precipitation or settling or the observation of a gurgling phenomenon on the surface of the formulation. The results are shown in Table 3.

[0051]

[0052] As shown in Table 3, the composition of Example 1, which contains sorbitan isostearate and polysorbate 60 as emulsifiers along with a high content of organic UV blocking ingredients, was confirmed to have excellent formulation stability at all temperatures, with no precipitation or settling occurring. In contrast, the compositions of Comparative Examples 1 to 6, which contain different types of emulsifiers such as cetyl PEG / PPG-10 / 1 dimethicone or sorbitan sesquioleate, were confirmed to have significantly poor formulation stability, with precipitation and settling of the organic UV blocking ingredients observed at specific temperatures and a phenomenon of the formulation surface becoming uneven.

[0054] Experimental Example 2. Comparison of Effects According to Emulsifier Mixing and Ratio

[0055] 2-1. Preparation of Comparative Examples 7 to 10

[0056] Based on the components of Example 1, compositions of Comparative Examples 7 and 8 containing either sorbitan isostearate or polysorbate 60 as an emulsifier, and compositions of Comparative Examples 9 and 10 with different mixing ratios of sorbitan isostearate and polysorbate 60 were prepared in the same manner. The modified content in the composition was replaced with diglyceryl triisostearate, an oil binder, and the other components were the same as in Example 1. Specific information is shown in Tables 4 and 5, and the unit of the component content in Tables 4 and 5 is weight%.

[0057]

[0058]

[0059] 2-2. Formulation Stability Evaluation

[0060] The formulation stability of the cosmetic compositions according to Example 1 and Comparative Examples 7 to 10 was evaluated. Specifically, each composition was placed in a transparent container and observed after being stored for two months in an incubator at various temperatures (cycle conditions where the temperature changes from 25℃, 5℃, 40℃, 50℃, to 5 to 40℃). It was marked as O if the formulation stability was excellent without any precipitation or settling, and X if there were problems with formulation stability, such as precipitation or settling or the observation of a gurgling phenomenon on the surface of the formulation. The results are shown in Table 6.

[0061]

[0062] As shown in Table 6, the composition of Example 1, containing sorbitan isostearate and polysorbate 60 in a weight ratio of 1:1, exhibited high transparency and excellent formulation stability under all temperature conditions. However, the compositions of Comparative Examples 7 and 8, containing only one of sorbitan isostearate or polysorbate 60, showed poor formulation stability, such as high opacity and separation and precipitation under high temperature and cycling conditions, because the compatibility between the components within the formulation was low and the mixing ability was reduced. Additionally, the compositions of Comparative Examples 9 and 10, containing sorbitan isostearate and polysorbate 60 in a weight ratio of 1:10 or 1:0.1, with one component in excess of the other, showed poor formulation stability, such as high opacity and separation and precipitation under high temperature and cycling conditions.

[0064] Through the experimental results above, it was confirmed that by optimally including sorbitan isostearate and polysorbate 60 along with a highly polar organic UV blocking ingredient, it is possible to achieve an effect with excellent transparency and formulation stability without precipitation issues of the UV blocking ingredient.

[0066] 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 cosmetic composition for UV protection comprising an organic UV blocking ingredient, sorbitan isostearate, and polysorbate 60, wherein the sorbitan isostearate is included in an amount of 1 to 8 weight% based on the total weight of the composition, and the polysorbate 60 is included in an amount of 1 to 8 weight% based on the total weight of the composition. Claim 2 A cosmetic composition according to claim 1, wherein the organic UV blocking ingredient is one or more selected from the group consisting of bis-ethylhexyloxyphenol methoxyphenyl triazine and ethylhexyl triazone. Claim 3 A cosmetic composition according to claim 1, wherein the organic UV blocking component is included in an amount of 5 to 30 weight% based on the total weight of the composition. Claim 4 delete Claim 5 delete Claim 6 A cosmetic composition according to claim 1, wherein the sorbitan isostearate and polysorbate 60 are included in a weight ratio of 1:0.5 to 1.

5. Claim 7 In claim 1, the cosmetic composition is a cosmetic composition having high transparency of the formulation. Claim 8 A cosmetic composition according to any one of claims 1 to 3, 6 and 7, wherein the cosmetic composition is for lips.

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