KR20120058714A - Sunscreen cosmetic composition having excellent durability - Google Patents

Abstract

PURPOSE: A cosmetic composition for UV protection is provided to protect skin from UV ray and to ensure softness and persistence. CONSTITUTION: A cosmetic composition for UV protection contains an aqueous phase part containing polymethyl silsesquioxane and an oil phase part containing silica and inorganic UV protector. The polymethyl silsesquioxane is dispersed in glycerin, propylene glycol, or butylenes glycol. The inorganic protector is titanium dioxide, zinc oxide, silicate, or talc. The composition further contains organic UV protector in the oil phase part.

Description

Sunscreen cosmetic composition having excellent durability}

The present invention relates to a cosmetic composition for sunscreen excellent in durability, and more particularly, by containing an aqueous phase comprising polymethylsilsesquioxane, and an oil phase containing silica and an inorganic sunscreen agent on the aqueous phase. The present invention relates to a sunscreen cosmetic composition that exhibits a fresh feeling and has excellent durability and does not appear after application of the skin.

Ultraviolet rays are invisible rays that penetrate deep into the skin, damaging the dermis and causing burns and skin cancer as well as aging and wrinkles. Ultraviolet rays are classified into UV-C at 240-290 nm wavelength, UV-B at 290-320 nm wavelength and UV-A at 320-400 nm wavelength, depending on the length of the wavelength. UVA, UVB, and UVC are divided into ultraviolet A (UVA) is the majority of the ultraviolet light reaches the earth. Ultraviolet A (UVA) penetrates the dermis of the skin and is known to cause skin aging and skin irritation such as promoting skin cancer, wrinkles and melanin formation. Ultraviolet B (UVB) penetrates the epidermis of the skin after overexposure for a short time, causing erythema, freckles and edema.

At the same time as these risks became known, the increased outdoor activity led to increased public interest in sun protection products, which led to various sun protection factors (SPFs) and protection grade of UVA, PA. ) Is being released.

The formulations of sunscreen products are classified into water in oil (W / O) and oil in water (O / W). The oil-in-water type is a hydrophilic type that has a light, moist and soft feeling, and is preferred by customers, but has a disadvantage of poor makeup durability and water resistance. The water-in-oil type (W / O), which is a lipophilic type, has very good water resistance, but has a poor skin burden such as stickiness, oiliness, spreading and spreadability. Also, when you go outside with sunscreen, contact with other people, friction with sunscreen applied to your skin and clothing you wear, sweat caused by increased sunlight caused by strong sunlight and outside activities, and in the summer In addition, due to the water play in the river, the sunscreen ingredients that need to be applied to the skin to block the UV rays are washed, and thus, the UV blocking function is often not performed. This means that if the product is excessively applied due to the concern that the product is washed out, it may be deposited or transferred to clothing or skin.

In the case of outdoor activities, various external factors are applied evenly to the skin to protect the skin from ultraviolet rays, and at the same time there is a continuous need for a sunscreen product that is completely absent or almost unspoiled.

Accordingly, the present inventors have conducted research for the production of a UV-protective cosmetic composition that is excellent in durability and does not adhere to the skin. As a result, the inventors disperse polymethylsilsesquioxane in the aqueous phase of the inner phase, and silica and inorganic ultraviolet in the oil phase. The present invention has been completed by discovering that containing a blocking agent has a light and fresh feeling and at the same time, it has excellent durability and does not adhere to the skin after application.

Accordingly, it is an object of the present invention to provide a cosmetic composition for sunscreen having excellent characteristics and excellent durability without providing a light and fresh feeling.

In order to achieve the above object, in the present invention

An aqueous phase including polymethylsilsesquioxane, and

It provides a sunscreen cosmetic composition containing an oil phase portion containing a silica and an inorganic sunscreen on the water phase.

The cosmetic composition for sunscreen of the present invention is evenly applied to the skin to protect the skin from ultraviolet rays while showing a light and fresh feeling of use and excellent persistence and no stain.

The present invention provides a cosmetic composition for protecting against UV rays comprising an aqueous phase comprising polymethylsilsesquioxane and an oil phase comprising silica and an inorganic sunscreen agent on the aqueous phase.

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

The polymethylsilsesquioxane contained in the aqueous phase as the inner phase in the cosmetic composition for sunscreen of the present invention is a silicone-based spherical powder having an average particle size of 200 nm or less and has lipophilic surface properties. In the present invention, the lipophilic polymethylsilsesquioxane, which is a silicone-based powder, strongly fixes the sunscreen ingredients to the skin so that they are not easily washed by various external frictions. do.

The polymethylsilsesquioxane of the present invention is contained in an amount of 0.1 to 4.0% by weight, more preferably 0.4 to 3.0% by weight based on the total weight of the composition. When the content of the polymethylsilsesquioxane is less than 0.4% by weight, the lipophilic properties of the polymethylsilsesquioxane may be insufficient to form a stable water-in-oil type sunscreen emulsion formulation, and when it exceeds 4.0% by weight, Phase inversion from the aqueous composition to the oil-in-water composition can occur.

The polymethylsilsesquioxane of the present invention is dispersed in at least one selected from the group consisting of glycerin, propylene glycol and butylene glycol before being contained in the aqueous phase. Thereby, polymethylsilsesquioxane which is a lipophilic spherical powder can be easily disperse | distributed to the water phase part which is an inner phase. When the polymethylsilsesquioxane is dispersed in the dispersion solvent, the polymethylsilsesquioxane is preferably mixed at 50.0 wt% or less, more preferably 40.0 wt% or less, based on the total weight of the dispersion solvent. When it exceeds 50.0% by weight, agglomeration of polymethylsilsesquioxane occurs, which does not disperse evenly in the dispersion solvent.

In the sunscreen cosmetic composition of the present invention, the silica contained in the oil phase, which is a trauma, is a spherical powder of 100 nm or less. Play a role.

The silica of the present invention is contained in an amount of 0.01 to 5.0% by weight, more preferably 0.4 to 4.0% by weight based on the total weight of the composition. If the content of the silica exceeds 5.0% by weight, it is difficult to move the silica to the interface due to the gelling phenomenon between the silicas, so that a stable composition is not obtained. It is not possible to form aqueous sunscreen emulsion formulations.

As the inorganic sunscreen agent contained in the oil phase of the cosmetic composition for sunscreen of the present invention, one or more selected from the group consisting of titanium dioxide, zinc oxide, silicate and talc may be used, and preferably titanium dioxide and zinc oxide are used. do.

The inorganic sunscreen used in the present invention is contained in an amount of 0.1 to 15.0% by weight, more preferably 2.0 to 10.0% by weight, based on the total weight of the composition. If the content of titanium dioxide is less than 0.1% by weight, a stable water-in-oil type composition is not obtained due to lack of flocculation at the interface. If the content of the titanium dioxide exceeds 15.0% by weight, application of the product to the skin is worsened. Not only can you feel stiff when applied, but it also affects formulation stability and can't be maintained for a long time.

In addition, the sunscreen cosmetic composition of the present invention may further include an organic sunscreen agent in the oil phase.

Examples of organic sunscreens usable in the present invention include octyl methoxycinnamate, cinnamate derivatives such as isoamyl-p-methoxycinnamate, butylmethok Salicylic acid derivatives such as butylmethoxy dibenzoylmethane, bisethylhexyloxyl phenolmethoxy phenyl triazine, octyl salicylate, p-aminobenzoic acid derivatives, benzo Phenones (benzophenones) and anthranilates.

The sunscreen component can be used by adjusting the content according to the desired sunscreen effect, in the present invention is used in combination appropriately with the aim of the sunscreen index SPF 50, PA index +++.

In the present invention, polymethylsilsesquioxane is pre-dispersed in the aqueous phase with a dispersing solvent such as butylene glycol to prepare a sunscreen cosmetic composition having excellent durability of light and fresh feeling, and silica and an inorganic sunscreen are continuously phased together. It is made to contain in an oil phase part. That is, by mixing the silica and the inorganic sunscreen in the oil phase and uniformly mixed with the aqueous phase containing the polymethylsilsesquioxane can be obtained the cosmetic composition for sunscreen of the present invention.

Hereinafter, the present invention will be described in more detail with reference to Examples and Test Examples. However, the following examples and test examples are provided only for the purpose of illustration to help the understanding of the present invention, and the scope and scope of the present invention is not limited thereto.

EXAMPLE 1 AND COMPARATIVE EXAMPLES 1-4

Example 1 and Comparative Examples 1 to 4 were prepared according to the composition of Table 1 (unit: wt%).

division Raw material name Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 The upper part
One Dicaprylyl Carbonate 5 5 5 5 5 Ethylhexylmethoxycinnamate 7 7 7 7 7 Isoamyl Paramethoxy Cinnamate 2 2 2 2 2 Ethylhexyl salicylate 4 4 4 4 4 Bisethylhexyloxyphenol methoxyphenyl triazine 3 3 3 3 3 Oily Part 2 Dimethicone 8 8 8 8 8 Cyclomethicone 10 10 10 10 10 Cyclomethicone / Dimethicone Crosspolymer 5 5 5 5 5 Nylon powder 2 2 2 2 2 Silica One - - One One C12-C15 alkylbenzoate / titanium dioxide / aluminum stearate / polyhydroxy acid / alumina (3.0% by weight of total weight as titanium dioxide) 7 - 7 7 - Zinc Oxide / Cyclopentasiloxane / Pig-9 Polydimethylsiloxyethyldimethicone / Hydrogendimethicone (8.0% by weight of total weight as zinc oxide) 20 - 20 20 - Polymethylmethacrylate / Titanium Dioxide / Zinc Oxide (Titanium Dioxide, Zinc Oxide as 0.05% by weight of Total Weight) 0.1 - 0.1 0.1 - Award Disodium iodide 0.02 0.02 0.02 0.02 0.02 Polymethylsilsesquioxane 2 - 2 - 2 Butylene glycol 5 5 5 5 5 glycerin 5 5 5 5 5 Sodium chloride 0.5 0.5 0.5 0.5 0.5 antiseptic 0.3 0.3 0.3 0.3 0.3 Alcohol 3 3 3 3 3 Purified water Balance Balance Balance Balance Balance

<The manufacturing method of Example 1 and Comparative Examples 1-4>

1) Warm the oil phase part 2 to 75-80 degreeC, disperse | distribute and melt | dissolve uniformly, and mix it uniformly with the oil phase part 1 of normal temperature state.

2) Mix all the water phase parts, and polymethylsilsesquioxane is pre-dispersed in butylene glycol.

3) While slowly adding the solution of 2) to the solution of 1) by dispersing with a homogenizer to prepare a cosmetic composition for UV protection.

Test Example 1 Sensory Evaluation on Lightness and Freshness

In order to evaluate the feeling of use of Example 1 and Comparative Examples 1 to 4, the sensory test was carried out on the cosmetic composition for UV blocking prepared in Example 1 and Comparative Examples 1 to 4.

Twenty women aged 25 to 35 years were asked to apply the sunscreen cosmetic composition to their skin on the back of their hands according to their normal usage, and then evaluate their average satisfaction with lightness and freshness. Sensory evaluation was performed based on the five-point criteria of very good (5 points), good (3 points), moderate (0), bad (-3 points), and very bad (-5 points). It is shown in Table 2 below.

division Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Light, refreshing feeling 4.1 3.7 2.8 2.4 4.3

As can be seen in Table 2, the water-in-oil type sunscreen cosmetic composition according to the present invention (Example 1) can reduce the stickiness peculiar to the sunscreen material by containing silica in the oil phase, polymethylsilsesquioxane in the water phase part Satisfaction was high in items for lightness and fresh feeling.

On the other hand, Comparative Example 1 and Comparative Example 4 did not contain an inorganic UV blocking component, so the stickiness and stiffness by the inorganic UV blocking component were not satisfied, so the satisfaction was high. However, the target UV protection index SPF 50 was Not satisfied Comparative Examples 2 to 3 did not contain the silica and polymethylsilsesquioxane, which is a spherical powder that serves to reduce the stickiness due to the sunscreen raw material at the same time was confirmed that the low satisfaction with light and refreshing feeling.

Test Example 2 No Buried and Persistence Evaluation

Evaluation was carried out for the unobtained properties and persistence of the compositions prepared in Examples 1 and Comparative Examples 1-4.

First, 0.05 g of the test substance was applied to an area of 50 cm ^{2 in the form} of an electric foil, and the composition was left to dry for 10 minutes in order to evaluate non-obtaining properties. The strip of polyester fabric was then contacted with the forehand processed using a machine to make a vertical movement. After the fabric was kept in tension, friction of the fabric occurred during movement. Ten rubbing movements were performed. The colored traces deposited on the fabric were evaluated by dividing them into 5 grades. The results are shown in Table 3 below.

<Evaluation Criteria for Non-Built Characteristics>

Grade 1: Very smeared, Grade 2: Smudged, Grade 3: Slightly smeared, Grade 4: Smudged, Grade 5: Smudged

Next, sensory evaluation was conducted to determine the persistence. After 50 women in their 20s and 40s were placed in a constant temperature and humidity room (25 ° C, 70% relative humidity condition) for about 15 minutes, the prepared cosmetics were divided into 4 parts on the arms of the panels and the same area (0.05 g). ) And allowed to stand for about 15 minutes. The brine at 35 ° C. was then flowed over for 30 minutes, and the color change before and after application was evaluated. After the sensory evaluation of the change in color on a five-point scale to obtain an average value, the results are shown in Table 3 below.

<Evaluation Criteria for Persistence>

5 points: very much, 4 points: yes, 3 points: normal, 2 points: no, 1 point: very not

division Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Not buried 4.4 4.6 2.9 2.4 4.5 Persistence 4.2 1.2 3.1 2.1 1.6

As can be seen from Table 3, it was confirmed that the water-in-oil type sunscreen cosmetic composition (Example 1) according to the present invention is excellent in both the properties and the persistence does not adhere to the fabric. This is because lipophilic polymethylsilsesquioxane, a silicone-based powder, strongly fixes UV-blocking ingredients to the skin, so that it is not easily washed by various external frictions to maintain UV-blocking ability. Because it does not play a role.

On the other hand, Comparative Examples 1 and 4 showed a high score in the non-staining item because zinc oxide and titanium dioxide, which are inorganic UV blocking components buried in the fabric, were not contained, and Comparative Example 2 was a lipophilic polymethylsilsesqui Since oxane was contained, the score of the persistence item was excellent compared with Comparative Examples 1 and 3-4.

Test Example 3 Evaluation of UV Protection

In order to compare the ultraviolet blocking ability of Example 1 and Comparative Examples 1 to 4, the ultraviolet blocking ability was tested as follows.

Subjects: 12 (6 males, 6 females)

Test area: left and right except for the spine

Light source: ORIEL Solar Simulator 81293 (Xenon UV Lamp 1KW, unfiltered)

Photometer: IL1733 Radiometer, SED 240 Probe

<Method of Measuring UV Block Index>

The amount of ultraviolet light emitted from the solar simulater lamp to the test site was adjusted to 20 to 100mj / cm 2 and irradiated to the back of the test subject. After 24 hours, the minimum erythema (Minimal Erythema Dosa: MED) was confirmed. In order to confirm the sunscreen effect of the sample, the sample was uniformly coated with a thickness of 2 μl / cm 2 on the subject's back and left to dry for 15 minutes. UV irradiation window was attached and fixed to the sample application site of Example 1 and Comparative Examples 1 to 4, and other areas except the irradiation window were blocked with UV using a leather and a towel and irradiated with UV light. Based on the subject's MED, SPF 50 and the expected sample were tested with SPF 15-40 and radiation dose, gradually increasing the UV irradiation dose. Minimum erythema amount was determined after 24 hours of ultraviolet irradiation, and the UV blocking effect was calculated according to Equation 1 below. The results are shown in Table 4 below.

division Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 SPF (average) 55.2 26.7 54.2 53.9 27.1

As can be seen from the results of Table 4, the sunscreen cosmetic composition (Example 1) according to the present invention was confirmed that the sunscreen ingredients are evenly applied to the skin to protect the skin from ultraviolet rays.

Claims (8)

An aqueous phase including polymethylsilsesquioxane; And
An oil phase including silica and an inorganic sunscreen on the water phase;
Cosmetic composition for blocking UV rays. The method of claim 1,
Wherein the polymethylsilsesquioxane is contained in at least one selected from the group consisting of glycerin, propylene glycol and butylene glycol before it is contained in the water phase. The method of claim 1,
The polymethylsilsesquioxane is UV-containing cosmetic composition, characterized in that contained in 0.1 to 4.0% by weight based on the total weight of the composition. The method of claim 1,
The silica is a cosmetic composition for sunscreen, characterized in that contained in 0.01 to 5.0% by weight based on the total weight of the composition. The method of claim 1,
The inorganic sunscreen agent is a sunscreen cosmetic composition, characterized in that at least one selected from the group consisting of titanium dioxide, zinc oxide, silicate and talc. The method of claim 1,
The inorganic sunscreen is a sunscreen cosmetic composition, characterized in that contained in 0.1 to 15.0% by weight based on the total weight. The method of claim 1,
The composition is a sunscreen cosmetic composition, characterized in that it further comprises an organic sunscreen in the oil phase. The method of claim 7, wherein
The organic sunscreen agent is octylmethoxycinnamate, cinnamate derivative of isoamyl-p-methoxycinnamate, butylmethoxydibenzoylmethane, bisethylhexyloxyphenol methoxyphenyltriazine, salicylic acid derivative of octyl salicylate, A sunscreen cosmetic composition, characterized in that at least one selected from the group consisting of PABA derivatives, benzophenone and anthranilate.