Two layer cosmetic composition for UV protection with completely transparent appearance

Abstract

The present invention relates to a bilayer liquid cosmetic composition for sunscreen having a transparent appearance. More specifically, the invention relates to a bilayer liquid cosmetic composition for sunscreen that separates transparently, comprising a water-soluble sunscreen agent, phenylbenzimidazole sulfonic acid, and terephthalilyliden dicamphor sulfonic acid in the aqueous phase, and an oil-soluble sunscreen agent, isoamyl p-methoxycinnamate, in the oil phase.

Description

Technology Field

[0001] The present invention relates to a bilayer liquid sunscreen cosmetic composition having a transparent appearance. More specifically, the invention relates to a liquid sunscreen cosmetic composition having a bilayer that separates transparently, comprising a water-soluble sunscreen agent, phenylbenzimidazole sulfonic acid, and terephthalilyliden dicamphor sulfonic acid in the aqueous phase, and an oil-soluble sunscreen agent, isoamyl p-methoxycinnamate, in the oil phase. Background Technology

[0002] Sunlight can be broadly classified into visible light, infrared, and ultraviolet light. Among these, ultraviolet light can be divided into UV A (320-400nm), UV B (290-320nm), and UV C (200-290nm) based on wavelength. In particular, UV B is known to penetrate the epidermis and cause erythema, freckles, and inflammation, while UV A is known to penetrate the dermis, forming melanin and wrinkles and inducing skin cancer. Due to these dangers of ultraviolet radiation, consumer interest in sunscreen products is increasing, leading to the release of sunscreen products in various formulations.

[0003] With the launch of numerous sunscreen products, there is an effort to differentiate them in terms of appearance and ease of use to enhance competitiveness. In particular, continuous efforts have been made to develop transparent sunscreen products with distinctive appearances, such as in the previously disclosed Korean Patent No. 10-2020-0105091, "Anhydrous sunscreen in a transparent gel formulation," or the registered patent No. 10-1798024, "Transparent cosmetic composition having a UV-blocking function." However, these products all have limitations in that they are anhydrous formulations, resulting in a sticky texture and poor absorption, which makes them inconvenient to use. The problem to be solved

[0004] The inventors completed the present invention by confirming that by applying an aqueous phase containing a suitable water-soluble sunscreen and an oil phase containing an oil-soluble sunscreen in two layers, a transparent appearance, excellent usability, and superior UV blocking effect is achieved.

[0005] Accordingly, the present invention aims to provide a sunscreen in the form of a two-layer liquid formulation to realize a cosmetic composition for sunscreen that exhibits a transparent appearance. In particular, since there are dozens or more types of sunscreens, appropriate water-soluble and oil-soluble sunscreens were selected by verifying numerous combinations to find conditions for transparent separation, and the invention aims to provide a two-layer liquid cosmetic composition for sunscreen that separates transparently. means of solving the problem

[0006] The above-mentioned problem is achieved by a transparent bilayer cosmetic composition for sunscreen, characterized by comprising water-soluble sunscreen agents, phenylbenzimidazole sulfonic acid and terephthalilyliden dicamphor sulfonic acid, in the aqueous phase, and oil-soluble sunscreen agent, isoamyl p-methoxycinnamate, in the oil phase.

[0007] Preferably, the phenylbenzimidazole sulfonic acid, the terephthalilyliden dicamphor sulfonic acid, and the isoamyl p-methoxycinnamate may each be included in an amount of 0.001 to 15.0 weight% relative to the total weight of the cosmetic composition.

[0008] Additionally, preferably, the cosmetic composition may include one or more selected from the group consisting of purified water, moisturizers, emulsifiers, pH adjusters, and preservatives.

[0009] Also, preferably, the terephthalilylidendicampersulfonic acid is an aqueous solution diluted to a volume percentage of 33%.

[0010] Also preferably, the phenylbenzimidazole sulfonic acid, the aqueous solution of terephthalilylidendicampersulfonic acid diluted to a volume percentage of 33%, and the isoamyl p-methoxycinnamate may be included in a weight ratio of 1:1:1. Effects of the invention

[0011] The cosmetic composition for sunscreen according to the present invention contains phenylbenzimidazole sulfonic acid and terephthalilylidendicamphor sulfonic acid, which are water-soluble sunscreen agents, and isoamyl p-methoxycinnamate, which is an oil-soluble sunscreen agent, and has a two-layer liquid formulation with a transparent appearance and excellent sunscreen ability. Brief explanation of the drawing

[0012] Figure 1 is a photograph showing the transparency and separation of a formulation example and a comparative formulation example according to the present invention. Specific details for implementing the invention

[0013] All technical terms used in this invention, unless otherwise defined, have the following definitions and correspond to the meaning generally understood by those skilled in the art in the relevant field of this invention. Additionally, while preferred methods or samples are described herein, similar or equivalents are also included within the scope of this invention.

[0014] The term “about” means an amount, level, value, number, frequency, percentage, dimension, size, quantity, weight, or length that varies by about 30, 25, 20, 25, 10, 9, 8, 7, 6, 5, 4, 3, 2, or 1% with respect to a reference amount, level, value, number, frequency, percentage, dimension, size, quantity, weight, or length.

[0015] Throughout this specification, unless otherwise required by the context, the terms “comprising” and “comprising” should be understood to imply that the presented steps or components, or groups of steps or components, are included, but any other steps or components, or groups of steps or components are not excluded.

[0016] The present invention relates to a liquid cosmetic composition for sunscreen comprising a suitable water-soluble sunscreen and an oil-soluble sunscreen.

[0017] Sunscreens are broadly classified into organic and inorganic types and serve to protect the skin from ultraviolet rays. Organic sunscreens protect the skin by chemically absorbing ultraviolet rays and releasing them in the form of heat; examples include water-soluble phenylbenzimidazole sulfonic acid, terephthalilyliden dicamphorsulfonic acid, and disodium phenyldibenzimidazole tetrasulfonate, while various oil-soluble types exist, such as isoamyl p-methoxycinnamate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl triazone, diethylaminohydroxybenzoyl hexyl benzoate, and ethylhexyl methoxycinnamate.

[0018] The sunscreen applied to the sunscreen cosmetic composition of the present invention is limited to water-soluble phenylbenzimidazole sulfonic acid, terephthalilyliden dicamphor sulfonic acid, and oil-soluble isoamyl p-methoxycinnamate.

[0019] In particular, the above terephthalilyliden dicamphorsulfonic acid can be used as an aqueous solution diluted in purified water to a volume percentage of 33%.

[0020] Each of the above phenylbenzimidazole sulfonic acid, the above terephthalilyliden dicamphor sulfonic acid, and the above isoamyl p-methoxycinnamate may be included in an amount of 0.001 to 15.0 weight% relative to the total weight of the cosmetic composition.

[0021] In addition, the cosmetic composition according to the present invention may include the sunscreen component in an amount of 0.01 to 70.0 weight%, preferably 5.0 to 50.0 weight%, relative to the total weight of the cosmetic composition.

[0022] According to one embodiment of the present invention, the phenylbenzimidazole sulfonic acid, the aqueous solution of terephthalilyliden dicamphor sulfonic acid, and the isoamyl p-methoxycinnamate may be included in a weight ratio of 1:1:1.

[0023] In addition, the cosmetic composition according to the present invention may further include one or more selected from the group consisting of purified water, moisturizers, emulsifiers, pH adjusters, and preservatives.

[0024] The cosmetic composition for UV protection according to the present invention is in a liquid state and can be prepared in the form of a solution or a spray.

[0026] Preferred embodiments are presented below to aid in understanding the present invention. However, the following embodiments are provided merely to facilitate a better understanding of the invention, and the scope of the invention is not limited by these embodiments.

[0028] Formulation example 1 and comparison Formulation example 1 to 4

[0029] Formulation Example 1, a cosmetic composition for sunscreen containing water-soluble phenylbenzimidazole sulfonic acid and terephthalilylidendicampersulfonic acid and oil-soluble isoamyl p-methoxycinnamate, was prepared, and compositions (Comparative Formulation Examples 1 to 4) with different types of sunscreen agents were prepared for comparison of transparency. The compositions of each formulation example are shown in Table 1 below.

[0030] division raw material Formulation Example 1 Comparative Formulation Example 1 Comparative Formulation Example 2 Comparative Formulation Example 3 Comparative Formulation Example 4 1 purified water to 100 to 100 to 100 to 100 to 100 2 1,2-hexanediol Appropriate amount Appropriate amount Appropriate amount Appropriate amount Appropriate amount 3 Phenylbenzimidazole sulfonic acid 10.00 - 10.00 10.00 10.00 4 Terephthalic lilidendicamphorsulfonic acid (33%(v / v)) 10.00 - 10.00 10.00 10.00 5 Disodium phenyldibenzimidazole tetrasulfonate - 10.00 - - - 6 Arginine Appropriate amount Appropriate amount Appropriate amount Appropriate amount Appropriate amount 7 Dicaprylyl carbonate 10.00 10.00 10.00 10.00 10.00 8 Isoamyl p-methoxycinnamate 10.00 10.00 - - - 9 Bis-ethylhexyloxyphenol methoxyphenyl triazine - - 10.00 - - 10 Ethylhexyl methoxycinnamate - - - 10.00 - 11 Ethylhexyl triazone - - - - 10.00

[0032] Experimental example 1 : Check whether the formulation separates transparently

[0033] The formulations prepared in Formulation Example 1 and Comparative Formulation Examples 1 to 4 were thoroughly mixed with equal force, waited until phase separation occurred, and then the transparency was checked. The results are shown in FIG. 1.

[0034] As shown in Fig. 1, Formulation Example 1 is transparently separated into upper and lower sections after separation, whereas Comparative Formulation Examples 1 to 4 show an opaque appearance after separation.

[0036] Experimental example 2 : UV protection level measurement

[0037] The UV protection values ​​(SPF, PA) of the formulation prepared in Formulation Example 1 above were confirmed using an SPF Analyzer (Optometrics, SPF-290AS). Immediately after thoroughly mixing the sample, 2 mg / cm² of the UV blocker was applied to a test plate (PMMA plate). 2 After even application, the sample was dried for 15 minutes. The SPF and PA of the dried sample were measured using the SPF Analyzer presented above, and the results are shown in Table 2.

[0038] division SPF PA Formulation Example 1 35.9 9.7

[0039] As shown in Table 2, it was confirmed that the SPF and PA values ​​were appropriate, which shows that there is no problem with the UV protection effect when the formulations are mixed and used.

Claims

Claim 1 A transparent bilayer cosmetic composition for sunscreen, characterized by comprising phenylbenzimidazole sulfonic acid and terephthalilylidendicampersulfonic acid, which are water-soluble sunscreen agents, in the aqueous phase, and isoamyl p-methoxycinnamate, which is an oil-soluble sunscreen agent, wherein the terephthalilylidendicampersulfonic acid is an aqueous solution diluted to a volume percentage of 33%, and comprising the phenylbenzimidazole sulfonic acid, the aqueous solution of terephthalilylidendicampersulfonic acid diluted to a volume percentage of 33%, and the isoamyl p-methoxycinnamate in a weight ratio of 1:1:

1. Claim 2 A cosmetic composition for sunscreen according to claim 1, characterized in that each of the phenylbenzimidazole sulfonic acid, the terephthalilylidendicamphorsulfonic acid, and the isoamyl p-methoxycinnamate is included in an amount of 0.001 to 15.0 weight% relative to the total weight of the cosmetic composition. Claim 3 A cosmetic composition for sunscreen according to claim 1, characterized in that the cosmetic composition comprises one or more selected from the group consisting of purified water, a moisturizer, an emulsifier, a pH adjuster, and a preservative. Claim 4 delete Claim 5 delete

Images