Cosmetic composition for ultraviolet blocking comprising polyglyceryl emulsifier and sorbitan-based emulsifier

Abstract

A cosmetic composition for blocking ultraviolet rays, which comprises an oil, an emulsifier, an inorganic-based ultraviolet ray blocking agent, and an aqueous phase portion, the emulsifier comprising a polyglyceryl emulsifier and a sorbitan emulsifier, is excellent in ultraviolet blocking effect, does not irritate the skin, and is excellent in formulation stability.

Description

Technical Field

[0001] This specification discloses a cosmetic composition for blocking ultraviolet rays, comprising an oil, an emulsifier, an inorganic-based ultraviolet blocking agent, and an aqueous phase, wherein the emulsifier comprises a polyglycerol-based emulsifier and a sorbitol-based emulsifier. Background Technology

[0002] Recently, while concerns about the safety of chemicals have increased in various industries such as food and hygiene products, there has also been much effort in cosmetics to eliminate ingredients that pose risks to skin or human health.

[0003] In particular, in the case of UV blockers targeting adult customers with sensitive skin or infants and children, many oil-in-water UV-blocking cosmetics containing only inorganic UV blockers have been developed due to concerns about skin irritation from organic UV blockers. In order to ensure the improved dispersibility and emulsification stability of the inorganic UV-blocking ingredients, most of them use emulsifiers with polyethylene glycol (PEG) groups that have excellent emulsifying and dispersing power (PEG-based emulsifiers).

[0004] However, as stability issues arose, products excluding the PEG-based emulsifier were developed. However, these products mainly have negative user experiences such as a dry, thick consistency or cloudiness, significantly reduced molding stability, and the drawback of oil or thickening wax that was included to ensure molding stability precipitating out.

[0005] Therefore, there is a need for research on cosmetic compositions that improve user experience and formulation stability compared to existing technologies while excluding PEG-based emulsifiers. Summary of the Invention

[0006] In one respect, the present invention aims to provide a cosmetic composition comprising a polyglycerol-based emulsifier and a sorbitol-based emulsifier, thereby providing excellent user experience and excellent formulation stability even without the presence of a PEG-based emulsifier.

[0007] In other respects, the present invention aims to provide a cosmetic composition containing an inorganic ultraviolet blocking agent, thereby providing excellent ultraviolet blocking effect without irritating the skin.

[0008] In one aspect, the present invention provides a cosmetic composition for blocking ultraviolet rays, comprising an oil, an emulsifier, an inorganic-based ultraviolet ray blocker, and an aqueous phase, wherein the emulsifier comprises a polyglycerol-based emulsifier and a sorbitol-based emulsifier.

[0009] In one aspect, the cosmetic composition for UV blocking of the present invention comprises a polyglycerol-based emulsifier and a sorbitol-based emulsifier, thereby providing excellent user experience and excellent formulation stability even without the presence of a PEG-based emulsifier. Furthermore, as a UV blocker, it contains an inorganic-based UV blocker, thus providing excellent UV blocking effect without irritating the skin. Attached Figure Description

[0010] Figure 1a and 1b These are photographs illustrating the precipitation stability of the cosmetic compositions of Example 1 and Comparative Example 1 of the present invention.

[0011] Figure 2a and 2b These are photographs illustrating the molding stability of the cosmetic compositions of Example 1 and Comparative Example 6 of the present invention. Detailed Implementation

[0012] Definition of terms

[0013] In this specification, when it is said that a part "contains" a certain element, it means that, unless specifically stated to the contrary, it does not exclude other elements and may also include other elements.

[0014] Description of exemplary embodiments

[0015] The present invention will now be described in detail.

[0016] In an exemplary embodiment of the present invention, the present invention is a cosmetic composition for blocking ultraviolet light, comprising an oil, an emulsifier, an inorganic-based ultraviolet blocking agent, and an aqueous phase, wherein the emulsifier comprises a polyglycerol-based emulsifier and a sorbitol-based emulsifier.

[0017] Unlike inorganic UV blockers, which prevent UV rays from penetrating the skin by physically scattering or reflecting them, organic UV blockers prevent UV rays from penetrating the skin through chemical absorption.

[0018] Therefore, the cosmetic composition of the present invention contains an inorganic-based ultraviolet blocker instead of an organic ultraviolet blocker that may cause irritation or toxicity to the skin due to chemical action, thereby making it safe to use on the skin of irritant children, sensitive skin, and post-dermatological procedures.

[0019] However, when the inorganic UV blocker is included, there are issues with the dry and viscous feel or the precipitation of oil or wax during the preparation process, which can affect the stability of the molding process. To address this, PEG-based emulsifiers are mainly used. However, there are concerns about the safety of PEG-based emulsifiers, such as the incomplete removal of components like 1,4-dioxane that are produced as byproducts during the synthesis process.

[0020] Therefore, the inventors have developed a cosmetic composition for blocking ultraviolet rays, which contains an inorganic-based ultraviolet antagonist that does not irritate the skin, and does not use the conventionally used PEG-based emulsifier, but instead contains a polyglycerol-based emulsifier and a sorbitol-based emulsifier, thereby achieving excellent shaping stability and excellent ultraviolet blocking effect.

[0021] In one embodiment, the polyglycerol-based emulsifier may comprise one or more selected from the group consisting of polyglycerol-2 dihydroxystearate, lauryl polyglycerol-3 polydimethylsiloxane, diisostearoyl polyglycerol-3 dilinoleate, polyglycerol-4 diisostearate / polyhydroxystearate / sebacate, polyglycerol-2 triisostearate, polyglycerol-3 diisostearate, polyglycerol-2 diisostearate and polyglycerol-3 polydimethylsiloxane.

[0022] The sorbitan-based emulsifier may comprise one or more selected from the group consisting of sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan tristearate, sorbitan monooleate, sorbitan sesquioleate, and sorbitan isostearate.

[0023] In particular, since the dehydrated sorbitol-based emulsifier has a linear structure, which is the opposite of the large volume structure of the polyglycerol-based emulsifier, it is possible to prepare a cosmetic composition that has excellent shaping stability and excellent dispersibility at high temperature when including one or more polyglycerol-based emulsifiers having different structures and one or more dehydrated sorbitol-based emulsifiers having a linear structure.

[0024] In one embodiment, based on the total weight of the cosmetic composition, the content of the total emulsifier can be 1 to 20% by weight, for example, 2 to 19% by weight, 3 to 18% by weight, 4 to 17% by weight, 5 to 16% by weight, 6 to 15% by weight, 7 to 14% by weight, or 8 to 13% by weight. When the emulsifier content is less than 1% by weight, it is difficult to ensure the stability of the formulation, such as wax precipitation or water separation, as time passes after the cosmetic composition is prepared. When it exceeds 20% by weight, the user experience of the cosmetic composition deteriorates, making it difficult to apply to the product.

[0025] In one embodiment, the oil may comprise one or more selected from the group consisting of C12-15 alkyl benzoate, coconut oil-caprylate / capric acid ester, dioctyl ether, glyceryl cocoate, methyl polytrimethoxysiloxane, butylene glycol dicaprylate / dicaprylate, and caprylic / capric acid triglyceride. The oil content may be 10 to 40% by weight, for example, 11 to 35%, 12 to 30%, or 13 to 25% by weight, based on the total weight of the cosmetic composition. When the oil content is less than 10% by weight, it may have a dry, thick feel; when it exceeds 40% by weight, it may feel oily when applied to the skin.

[0026] In one embodiment, the inorganic-based UV blocker may be one or more selected from the group consisting of titanium dioxide, zinc oxide, and iron oxide. Based on the total weight of the cosmetic composition, the content of the inorganic-based UV blocker may be 10 to 40% by weight, for example, 11 to 35%, 12 to 30%, or 13 to 25% by weight. When the content of the inorganic-based UV blocker is less than 10% by weight, the UV blocking effect may be negligible; when it exceeds 40% by weight, the user experience and formulation safety may be reduced.

[0027] In one embodiment, the aqueous phase may comprise one or more of the group consisting of water, hydrogen chloride, butylene glycol, ethylhexylglycerin, and glyceryl caprylate, and the aqueous phase content may be 20 to 50% by weight, for example, 23 to 47%, 26 to 44%, or 30 to 40% by weight, based on the total weight of the cosmetic composition. When the aqueous phase content is less than 20% by weight, a greasy and sticky feel may be felt, and dispersibility may be reduced; when it exceeds 50% by weight, separation of the oil phase and the aqueous phase may occur.

[0028] In one embodiment, the cosmetic composition may further comprise one or more of powder, wax, and inorganic thickener.

[0029] In one embodiment, the powder used for the feel of a UV-blocking cosmetic composition may be selected from one or more of the group consisting of silica, vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane crosspolymer, polymethylsilsesquioxane, and polymethyl methacrylate. Based on the total weight of the cosmetic composition, the content of the powder may be 1 to 10% by weight, for example, 1.5 to 9% by weight, 2 to 8% by weight, 2.5 to 7% by weight, or 3 to 6.5% by weight. The powder, within the specified content, provides a soft feel to the cosmetic composition while preventing precipitation during molding.

[0030] In one embodiment, the wax may be at least one selected from hydrogenated vegetable oil and trihydroxystearyl, and the content of the wax may be 0.5 to 5% by weight, based on the total weight of the cosmetic composition, for example, 1 to 4.5% by weight, 1.5 to 4% by weight, or 2 to 3.5% by weight. The wax can provide a soft feel while preventing precipitation during molding within the said content.

[0031] In one embodiment, the inorganic thickener may be a lithium montmorillonite-based inorganic thickener, preferably distearate dimethylammonium lithium montmorillonite. Based on the total weight of the cosmetic composition, the content of the inorganic thickener is 0.5 to 5% by weight, for example, 1 to 4.5% by weight, 1.5 to 4% by weight, or 2 to 3.5% by weight. The inorganic thickener, within the stated content, prevents wax precipitation without compromising usability.

[0032] In one embodiment, the UV-blocking cosmetic composition may be a water-in-oil type. Therefore, the aqueous phase component in the UV-blocking cosmetic composition does not evaporate and has good affinity with the skin.

[0033] In another exemplary embodiment of the invention, the invention is a method of administering or applying a cosmetic composition to the skin of a person in need of it in an effective amount to block ultraviolet radiation, the cosmetic composition comprising an oil, an emulsifier, an inorganic-based ultraviolet blocking agent and an aqueous phase, the emulsifier comprising a polyglycerol-based emulsifier and a dehydrated sorbitol-based emulsifier.

[0034] In another exemplary embodiment of the invention, the invention is used for the ultraviolet blocking of a composition comprising an oil, an emulsifier, an inorganic-based ultraviolet blocking agent, and an aqueous phase, wherein the emulsifier comprises a polyglycerol-based emulsifier and a dehydrated sorbitol-based emulsifier.

[0035] In another exemplary embodiment of the invention, the invention is used in the preparation of a composition for use in cosmetics for blocking ultraviolet radiation, the composition comprising an oil, an emulsifier, an inorganic-based ultraviolet blocking agent and an aqueous phase, the emulsifier comprising a polyglycerol-based emulsifier and a sorbitol-based emulsifier.

[0036] The present invention will now be described in more detail through the following embodiments. However, the following embodiments are provided for illustrative purposes only to aid in understanding the present invention, and the scope and range of the present invention are not limited thereto.

[0037] Example - Preparation of cosmetic compositions for UV blocking

[0038] The cosmetic compositions of Examples 1-5 and Comparative Examples 1-8 are prepared according to the formulations in Tables 1 and 2 below.

[0039] [Table 1]

[0040]

[0041]

[0042]

[0043] [Table 2]

[0044]

[0045]

[0046]

[0047] Experimental Example 1 - Observation of Pattern Stability

[0048] The dispersibility and formulation stability of the UV-blocking cosmetic compositions prepared according to the above formulation were observed and are shown in Tables 3 and 4 below. Photographs observing the precipitation stability of Example 1 and Comparative Example 1 are also shown. Figure 1a and Figure 1b The photographs showing the emulsification stability of Example 1 and Comparative Example 6 are shown in the figure. Figure 2a and Figure 2b .

[0049] [Table 3]

[0050]

[0051] [Table 4]

[0052] Example 2 Example 3 Example 4 Comparative Example 7 Example 6 Comparative Example 8 stability good good good Low viscosity good Poor dispersion

[0053] Referring to Tables 3 and 4 above, when only two emulsifiers were used (Comparative Examples 2-5), emulsion stability could not be guaranteed. When cyclic shaking was performed for 3 days (-0°C to 45°C, 1 cycle / 24 hours, rotating at 150 rpm), emulsion particle breakage and water separation were observed. When a bulky diisostearoyl polyglycerol-3-dimer linoleate emulsifier was used as the main surfactant, and a bulky and linear auxiliary emulsifier was used (Comparative Example 6), emulsion stability was ensured, but dispersibility decreased at high temperatures.

[0054] Ultimately, in Example 1, with the additional use of four polyglycerol-based emulsifiers and a linear auxiliary emulsifier with different structures, dispersibility and emulsification stability at high temperatures were fully ensured.

[0055] Furthermore, when using other emulsifiers with dehydrated sorbitol groups in the linear auxiliary emulsifiers, excellent results can also be ensured in terms of emulsification stability and high-temperature dispersibility (Examples 2 and 3). In addition, when the polyglycerol-based and dehydrated sorbitol-based emulsifiers were increased by 13% by weight (Example 4) and 22% by weight (Comparative Example 7), similar effects as in Example 1 could be achieved in terms of emulsification stability and dispersibility. However, in the case of Comparative Example 7, not only was the viscosity of the contents very low, but the sticky and dry feel made it difficult to achieve the quality of a product.

[0056] When the inorganic thickener is increased, stability and usability can be ensured similarly to those in Example 1 when used at 2.5% by weight (Example 5), but high-temperature dispersibility decreases when used at a content of more than 5% by weight (Comparative Example 8).

[0057] Therefore, in order to achieve a suitable user experience and ensure stability as a product, an emulsifier content of 1 to 20% by weight and an inorganic thickener content of 0.5% to 5% by weight are used to overcome the limitations of the prior art.

[0058] Experimental Example 2 - Molding stability Measurement of UV blocking effect

[0059] The shaping stability, accelerated stability, and ultraviolet blocking effect of the cosmetic compositions of Example 1 and Comparative Example 1 of the present invention at room temperature were determined and are shown in Table 5 below.

[0060] [Table 5]

[0061]

[0062] When comparing the UV blocking effects of Comparative Example 1, which applies the prior art, and Example 1, where dispersibility and emulsification stability at high temperatures are fully ensured, the UVB blocking effect is improved, while the PA, as the UVA blocking effect, can be maintained at the same level. Therefore, it can be confirmed that the UV blocking cosmetic composition of the present invention has a superior UV blocking effect compared to existing UV blocking cosmetic compositions, even without the use of a PEG-based emulsifier.

Claims

1. A cosmetic composition for blocking ultraviolet rays, comprising an oil, an emulsifier, an inorganic-based ultraviolet blocking agent, and an aqueous phase. The emulsifier comprises a polyglycerol-based emulsifier and a sorbitol-based emulsifier. The polyglycerol-based emulsifier comprises polyglycerol-2 dihydroxystearate, lauryl polyglycerol-3 polydimethylsiloxane-ethyl polydimethylsiloxane, diisostearoyl polyglycerol-3 dilinoleate, and polyglycerol-4 diisostearate / polyhydroxystearate / sebate. The emulsifier content is 1 to 20% by weight, based on the total weight of the composition. The cosmetic composition further comprises an inorganic thickener in an amount of 0.5 to 5% by weight based on the total weight of the composition.

2. The cosmetic composition for blocking ultraviolet rays according to claim 1, characterized in that, The sorbitan-based emulsifier comprises one or more selected from the group consisting of sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan tristearate, sorbitan monooleate, sorbitan sesquioleate, and sorbitan isostearate.

3. The cosmetic composition for blocking ultraviolet rays according to claim 1, characterized in that, The oil comprises one or more selected from the group consisting of C12-15 alkyl benzoate, coconut oil alcohol-octanoate / decanoate, dioctyl ether, glyceryl cocoate, methyl polytrimethoxysiloxane, butanediol dioctanoate / decanoate and caprylic / decanoic acid triglyceride.

4. The cosmetic composition for blocking ultraviolet rays according to claim 1, characterized in that, Based on the total weight of the cosmetic composition, the oil content is 10 to 40% by weight.

5. The cosmetic composition for blocking ultraviolet rays according to claim 1, characterized in that, The inorganic-based ultraviolet blocking agent is selected from one or more of the group consisting of titanium dioxide, zinc oxide and iron oxide.

6. The cosmetic composition for blocking ultraviolet rays according to claim 1, characterized in that, Based on the total weight of the cosmetic composition, the content of the inorganic-based ultraviolet blocker is 10 to 40% by weight.

7. The cosmetic composition for blocking ultraviolet rays according to claim 1, characterized in that, The aqueous phase comprises one or more selected from the group consisting of water, hydrogen chloride, butanediol, ethylhexylglycerol, and glyceryl caprylate.

8. The cosmetic composition for blocking ultraviolet rays according to claim 1, characterized in that, Based on the total weight of the cosmetic composition, the aqueous phase content is 20 to 50% by weight.

9. The cosmetic composition for blocking ultraviolet rays according to claim 1, characterized in that, The cosmetic composition further comprises one or more of a powder and a wax.

10. The cosmetic composition for blocking ultraviolet rays according to claim 9, characterized in that, Based on the total weight of the cosmetic composition, the content of the powder is 1 to 10% by weight.

11. The cosmetic composition for blocking ultraviolet rays according to claim 9, characterized in that, The wax content is 0.5 to 5% by weight, based on the total weight of the cosmetic composition.

12. The cosmetic composition for blocking ultraviolet rays according to claim 9, characterized in that, The inorganic thickener is a lithium montmorillonite-based inorganic thickener.

13. The cosmetic composition for blocking ultraviolet rays according to claim 1, characterized in that, The cosmetic composition for blocking ultraviolet rays is a water-in-oil type.

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