KR20030069400A - Emulsifier-free UV protecting cosmetic compositions of the oil-in-water type which has water splash appearance and a method of preparing thereof - Google Patents

Abstract

PURPOSE: Provided are an emulsifier-free UV protecting cosmetic composition of the oil-in-water type which has water splash appearance and a method of preparing thereof. The manufactured oil-in-water emulsion contains hydrophilic silica and oilphilic titanium dioxide, and thus has excellent UV blocking effect. CONSTITUTION: An emulsifier-free UV protecting cosmetic composition of the oil-in-water type which has water splash appearance is characterized by containing 0.01-5.0 wt.% of hydrophilic silica and 0.1-7.0 wt.% of oilphilic titanium dioxide, based on total weight of the composition.

Description

Emulsifier-free UV protecting cosmetic compositions of the oil-in-water type which has water splash appearance and a method of preparing FIG }

The present invention relates to a sunscreen oil-in-water cosmetic composition for producing a water-splash phenomenon without containing an emulsifier and a method for producing the same.

Ultraviolet rays emitted from sunlight are the main causes of erythema, edema, freckles and skin cancer. Recently, many studies on various skin diseases caused by ultraviolet rays have been actively conducted. In addition, as the industry develops, skin irritation caused by living ultraviolet rays generated from electrical and electronic products is also emerging.

Conventional sunscreen cosmetics are generally formulated into creamy and latex products by combining water-soluble and water-insoluble UV absorbers with ultra-fine particles for the purpose of UV scattering. In the case of such creamy or latex products, oils and waxes Was used in large quantities. Therefore, since they are heavy and oily, the use of such a product in the summer when the sweat is high and the temperature is high reduces the sunscreen effect, does not provide a fresh feeling, and puts a considerable burden on the skin. In addition, in the conventional sunscreen oil-in-water emulsion formulations, emulsifiers and waxes are generally used, and the sunscreen contains a sunscreen powder, mainly TiO ₂ . The reason for containing the ultraviolet powder in the outer box was to increase the UV protection index, but in the case of the above, when the emulsifier is used to apply to the skin, the stickiness appears, and the use of wax shows a feeling of high adhesion, and the water-splash phenomenon It will not appear.

Thus, the inventors of the present invention, when the cosmetic composition for the sun protection by containing a hydrophilic silica and lipophilic titanium dioxide in the inner phase in order to solve the above problems, water-splash phenomenon without containing emulsifiers A new formulation different from the conventional one was found.

Furthermore, as a result of extensive research of the present invention, when the hydrophilic silica is contained in an amount of 0.01 to 5.0% by weight and 0.1 to 7.0% by weight of lipophilic titanium dioxide in the inner phase of the emulsion, The present invention has been accomplished by discovering that it can exhibit a splash phenomenon.

Accordingly, an object of the present invention is to provide a sunscreen cosmetic composition having a water splash phenomenon as a water-in-oil emulsion made by containing hydrophilic silica and lipophilic titanium dioxide in its inner phase, and a method for preparing the same.

In order to achieve the above object, the cosmetic composition according to the present invention is a cosmetic composition for protecting against UV rays that does not include an emulsifier, and 0.01 to 5.0% by weight of hydrophilic silica and 0.1 to 7.0% by weight of lipophilic titanium dioxide based on the total weight of the composition. It is characterized by containing in the inner phase of the type emulsion.

Hydrophilic silica and lipophilic titanium dioxide are mixed into the inner phase and uniformly mixed with the aqueous phase component to obtain an oil-in-water emulsion.

Hereinafter, the present invention will be described in more detail.

The sunscreen cosmetic composition according to the present invention is an oil-in-water emulsion, but exhibits a water-splash phenomenon with a composition different from that of a conventional emulsion. Therefore, in the oil-in-water cosmetic composition for sunscreen according to the present invention, the hydrophilic silica contained in the oil phase as an inner phase contains an amount of 0.01 to 5.0% by weight, preferably 0.5 to 4.0%, based on the total weight of the composition, Titanium contains an amount of 0.1 to 7.0% by weight, preferably 2.0 to 6.0% by weight of the total weight of the composition. In addition, the oil forming the oil phase can be used by adjusting the silicone-based oil, if you want a light feeling according to the feeling, if you want a heavy feeling of ester or triglyceride-based oil content, the total oil weight exceeds 50% of the total weight Do not do it. In addition, there is no need to use a separate emulsifier in the interior.

The water splash phenomenon means a phenomenon in which water spreads in all directions when applied to the skin.

Hereinafter, the present invention will be described in detail with respect to the cosmetic composition for sunscreen exhibiting a water-splash phenomenon, for example and comparative examples, the present invention is not limited to these examples.

<Examples 1 and 2 and Comparative Examples 1 and 2>

The formulations below are all O / W formulations and are in weight percent.

division Raw material name Example 1 Example 2 Comparative Example 1 Comparative Example 2 Oil phase Octylmethoxycinnamate 7.5 7.5 7.5 7.5 Isoamyl Paramethoxy Cinnamate 1.0 - 2.0 2.0 Octyl triazone - 2.0 2.0 2.0 Octyl salicylate - 5.0 - - Meadowfoam seed oil 2.0 2.0 2.0 2.0 antiseptic - - 0.3 0.3 Silica 0.5 0.5 - - Titanium Dioxide (lipophilic) 5.0 5.0 - - Cyclomethicone 3.0 3.0 4.0 4.0 Dimethicone 2.0 2.0 1.0 1.0 Alkylbenzoate 3.0 3.0 0.5 0.5 Phenyltrimethicone 3.0 3.0 - - Sorbitan sesquioleate - - 0.4 0.4 Sorbitan stearate - - 1.2 1.2 Lipophilic glyceryl stearate - - 1.2 1.2 Glyceryl Stearate SE / Fiji 100 Stearate - - 0.8 0.8 Stearic acid - - 1.3 1.3 Dicaprylcarbonate - - 5.0 5.0 Cetearyl Alcohol - - 1.5 1.5 Zinc oxide - 0.5 - - Water component 1 Purified water To 100 To 100 To 100 To 100 glycerin 3.0 3.0 3.0 3.0 Butylene glycol 3.0 3.0 3.0 3.0 Sodium magnesium silicate - - 0.2 0.2 TA stearate 10% aqueous solution - - 1.0 1.0 antiseptic 0.5 0.5 0.2 0.2 Titanium Dioxide (Hydrophilic) - - 4.0 2.0 Beta Glucan 3.0 3.0 3.0 3.0 Water component 2 Polyacrylamide / Laureth-7 / C13-14 Isoparaffin 1.0 1.0 0.6 0.6

<Production Method of Example>

(1) The oil phase components were mixed uniformly.

(2) The water component 1 was uniformly mixed and dissolved.

(3) After slowly adding the above (1) at room temperature with stirring (1), the aqueous phase component 2 was continuously added again, and the oil-in-water emulsion was obtained.

<Production Method of Comparative Example>

(1) The oil phase components were heated (70 to 75 ° C) and mixed uniformly.

(2) The aqueous phase component 1 was heated (70 to 75 ° C.) to be uniformly dissolved and mixed.

(3) After slowly adding (1) to (2) in the state which kept temperature (70-75 degreeC) under stirring, the aqueous phase component 2 was continuously added and cooled, and the oil-in-water emulsion was obtained.

<Test Example 1>

In order to compare the particle size of the oil-in-water emulsion prepared in Examples 1 and 2 and Comparative Examples 1 and 2 were measured using an optical microscope and a particle analyzer, 1 month at room temperature, 4 ℃, 37 ℃ and 45 ℃ And standing for 2 months to evaluate the separation state to determine the emulsion stability. The results are shown in Table 2.

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 Residual particle size (µm) 67 73 4 3 Room temperature 1 month O O O O 2 months O O O O 4 ℃ 1 month O O O O 2 months O O O O 37 ℃ 1 month O O O O 2 months O O O O 45 ℃ 1 month O O O O 2 months O O △ O O: Good, △: Normal, X: Separation

As can be seen in Table 2, the emulsion particle size of the present invention did not use an emulsifier, it was confirmed that the size of the particles are relatively larger than in Comparative Examples 1 and 2. In addition, the emulsion stability was found to be stable both when the emulsifier is used or not.

<Test Example 2>

In order to evaluate the usability and the presence of water-splash phenomenon of the above Examples and Comparative Examples, 40 women in their 20s and 40s were subjected to relative comparative evaluation by the sensory evaluation method. The results are shown in Table 3.

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 Feeling O O X X Water-Splash Phenomenon U U radish radish O: Good, △: Normal, X: Separation

As can be seen in Table 3, it can be seen that the oil-in-water cosmetic composition according to the present invention does not contain an emulsifier and is excellent in terms of use, and also water-splash phenomenon occurs only in Examples 1 and 2. .

<Test Example 3>

SPF (ultraviolet ray blocking index) was measured through an in-vivo test to see the degree of UV blocking of the above Examples and Comparative Examples.

That is, 10 or more test subjects were selected per product, and the clean and dry state was used as the test site (etc.), avoiding the part where the skin damage, the excessive hair and the color tone are particularly different. Subsequently, the skin type of the subject was examined through a questionnaire, and the expected minimum amount of erythema was determined based on the questionnaire, and a solar simulator equipped with a Xenon arc lamp or a similar light source was examined. After irradiation, the erythema state of the subject was determined between 16 and 24 hours, and the minimum amount of UVB light irradiated to the site where the erythema appeared on the front surface was set as the minimum erythema amount.

Then coated with a standard sample application site and the amount of product to the application site to more than 24cm ² and divided into 5 or more irradiation portion having a surface area at least 0.5cm ^2, 2.0mg / cm ² or 2.0μL / cm ² to the test subjects It was. Thereafter, the mixture was left to dry at room temperature for 15 minutes, and then the minimum amount of erythema was measured in the same manner as the minimum amount of erythema before application of the product. Thereafter, the UV protection index was calculated by Equation 1 below and the results are shown in Table 4.

n: number of samples

­ 95% confidence interval = (SPF-C) to (SPF + C)

­

-S: standard deviation, t value: degree of freedom

n 10 11 12 13 14 15 16 17 18 19 20 t value 2.262 2.228 2.201 2.179 2.160 2.145 2.131 2.120 2.110 2.101 2.093

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 SPF 37 50+ 40 25

As can be seen in Table 4, the UV blocking index of the oil-in-water cosmetic composition according to the present invention was confirmed that up to 50 + by adjusting the UV-related main components. UV-related main ingredients refer to ingredients notified by the UV functional cosmetics law or raw materials approved by the company as UV-related main ingredients. Octyl salicylate, titanium dioxide (hydrophilic), titanium dioxide (lipophilic), and zinc oxide are seven components.

As described above, by containing the hydrophilic silica and lipophilic titanium dioxide in the inner phase, it is possible to produce a stable oil-in-water type sunscreen cosmetic composition, thereby producing a formulation having a water-splash phenomenon. In addition, the oil-in-water cosmetics prepared without the use of emulsifiers were light and refreshing, and the UV protection index was found to be up to 50+.

Claims (5)

An oil-in-water emulsion composition containing no oil emulsifier, comprising a hydrophilic silica and a lipophilic titanium dioxide in its inner phase. The oil-in-water type sunscreen cosmetic composition according to claim 1, wherein the hydrophilic silica is contained in an amount of 0.01 to 5.0% by weight based on the total weight of the composition. The oil-in-water type sunscreen cosmetic composition according to claim 1, wherein the lipophilic titanium dioxide contains 0.1 to 7.0% by weight based on the total weight of the composition. The oil-based cosmetic composition for sunscreen according to any one of claims 1 to 3, wherein the cosmetic composition for sunscreen shows a 'water-splash' phenomenon when applied to the skin. . A method for producing a cosmetic composition for sunscreen, comprising hydrophilic silica and lipophilic titanium dioxide in an inner phase and homogeneously mixing with the aqueous phase component.