KR102520887B1 - Cosmetic composition for UV protection comprising porous composites - Google Patents

Abstract

The present invention relates to a sun-blocking cosmetic composition containing a porous composite. The sun-blocking cosmetic composition comprises a porous composite containing natural extracts within the pores of porous particles manufactured by attaching titanium dioxide to a core. The present invention provides the sun-blocking cosmetic composition having excellent sun-blocking performance, feeling of use, and stability, and shows reduced white cast.

Description

Cosmetic composition for UV protection comprising porous composites

The present invention relates to a cosmetic composition for sunscreen comprising a porous composite.

UV rays are known to be the main cause of skin aging, such as promoting wrinkles and melanin formation, and various cosmetics are being developed to effectively block UV rays. Conventional underwater type (O / W) products have been widely used, but they are weak against sweat or water, so they are not suitable for use in environments where they are easily exposed to sweat or water, such as swimming or mountain climbing. In order to solve this problem, products using inorganic sunscreens such as titanium dioxide and zinc oxide are widely used.

Titanium dioxide is mainly used as an inorganic sunscreen because of its excellent effect of absorbing, reflecting, and scattering light, but products containing it have a problem in that the cloudiness phenomenon is prominent, and titanium dioxide is accumulated in the pores of the skin. there is On the other hand, nano-sized titanium dioxide has been used to solve this problem, but as research results have been published that respiratory diseases such as lung cancer can occur when inhaling nano-sized titanium dioxide particles for a long time, cosmetics containing it Safety issues began to emerge.

Accordingly, there is a need for inorganic sunscreens that reduce cloudiness of conventional inorganic sunscreens, are safe, and have excellent sunscreen performance and a feeling of use.

The present invention provides a cosmetic composition for sunscreen with excellent sunscreen performance, feeling of use and stability, and reduced cloudiness.

The present invention provides a cosmetic composition for sunscreen comprising a porous composite containing a natural extract in the pores of porous particles prepared by attaching titanium dioxide to a core.

The cosmetic composition for sunscreen of the present invention has excellent sunscreen performance, feeling of use, and stability, and can prevent inorganic sunscreen agents from accumulating in pores while minimizing cloudiness. In addition, since the porous composite according to the present invention contains active ingredients having anti-aging and anti-inflammatory effects in the pores, it serves to protect the skin at the same time as blocking ultraviolet rays.

Hereinafter, the present invention will be described. However, it is not limited only by the following contents, and each component may be variously modified or selectively mixed as needed. Therefore, it should be understood to include all modifications, equivalents or substitutes included in the spirit and scope of the present invention.

The cosmetic composition for sunscreen of the present invention includes a porous composite containing a natural extract in the pores of porous particles prepared by attaching titanium dioxide to a core. In addition, the cosmetic composition for sunscreen of the present invention may further include ingredients commonly used in cosmetics, such as surfactants, antioxidants, preservatives, humectants, and lubricants.

porous composite

The cosmetic composition for sunscreen of the present invention includes a porous composite. The porous composite includes a natural extract in the pores of porous particles prepared by attaching titanium dioxide to the core. The porous composite of the present invention can form a stable formulation, and exhibits an effect of protecting damaged skin from ultraviolet rays at the same time as blocking ultraviolet rays.

As the core, silica, polymethyl methacrylate (PMMA), mica, synthetic fluorophlogopite, and the like may be used. The average diameter of the core particles may be 2 to 10 μm. When the average diameter of the core particles is out of the above range, stability may be deteriorated.

The titanium dioxide particles may have an average diameter of 0.1 to 1 μm and an oil absorption of 1.0 ± 0.5 to 15.0 ± 0.5 ml/100g. When the average diameter and oil absorption of the titanium dioxide particles are out of the above ranges, stability may be deteriorated.

Titanium dioxide is attached to the core to prepare porous particles. For example, titanium dioxide may be attached to the core using a spray drying method. Titanium dioxide may be included in an amount of 30 to 80% by weight, for example, 40 to 65% by weight based on the total weight of the porous composite. An average diameter of pores generated in the porous particle may be 0.1 to 3 μm. When the average diameter of the pores is out of the above range, stability may be deteriorated.

The porous composite of the present invention is prepared by supporting a natural extract in the pores formed in the porous particles. As the natural extract, substances having anti-inflammatory, anti-aging, whitening, and antioxidant effects can be used without limitation, and in particular, the cell protection function against ultraviolet rays is excellent, so that cell death is inhibited, cytotoxicity is not caused, and ultraviolet rays Substances having an excellent effect of alleviating induced skin inflammation and thereby inhibiting gene expression of MMP1, MMP9, and TNF-a may be used. For example, as the natural extract, centella asiatica extract, seokchangpo extract, soja extract, lotus extract, ginseng extract and the like can be used.

For example, the natural extract may be centella asiatica extract. Centella asiatica extract contains asiatic acid, madecassic acid, and asiaticoside, and is an effective substance for wound healing by reducing inflammatory reactions and increasing glycoproteins such as skin collagen and fibrotectin. In addition, centella asiatica extract helps to prevent photoaging and is effective in restoring the skin's epidermal layer aged by excessive exposure to ultraviolet rays. However, when the centella asiatica extract was applied to cosmetics, there was a problem in that it was difficult to apply the highly concentrated powder to the cosmetic formulation because a lot of the powder was precipitated. In the present invention, a stable formulation in which precipitation is prevented can be formed by dissolving the centella asiatica extract in a solvent such as ethanol and then impregnating the pores of the porous particles.

The natural extract may be included in an amount of 0.1 to 10% by weight based on the total amount of the porous composite. When the content of the natural extract is less than the above-mentioned range, sunscreen and damaged skin recovery effects may be insufficient, and when it exceeds the above-mentioned range, stability may be deteriorated.

An average diameter of the porous composite may be 10 to 30 μm.

The porous composite may be included in an amount of 0.1 to 15% by weight based on the total amount of the cosmetic composition. If the content of the porous composite is less than the above range, the UV blocking effect may be insufficient, and if it exceeds the above range, dispersibility and feeling of use may be poor.

Other Ingredients

Components such as surfactants, antioxidants, preservatives, humectants, and lubricants may be further added to the cosmetic composition for sunscreen.

As the surfactant, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, and the like may be used. For example, glyceryl stearate, polysorbate 20, potassium cetyl phosphate, lecithin, sorbitan sesquioleate, polyglyceryls and the like can be used.

As the antioxidant, butylhydroxyanisole, propyl gallic acid, elisorbic acid, and the like may be used.

The above preservatives include phenoxyethanol, ethanol, pentylene glycol, hexanediol, ethylhexyl glycerin, caprylyl glycol, glycerin, butylene glycol, propylene glycol, acetic acid, butyric acid ), citric acid, palmitic acid, oxalic acid, tartaric acid, glycolic acid, lactic acid, maleic acid], Dipotassium glycyrrhizate etc. can be used.

As the moisturizing agent, polyols such as glycerin, propylene, and butylene glycol, sugars such as glucose, trehalose, xylitol, and erythritol may be used.

As the thickener, cellulose gum, xanthan gum, agar, tamarind gum, guar gum, gum arabic, cetyl alcohol, stearyl alcohol, cetearyl alcohol, sodium chloride, polyquaternium-7, carbomer, etc. may be used. .

The cosmetic composition of the present invention can be prepared in any formulation commonly prepared in the art, for example, solutions, suspensions, emulsions, pastes, gels, creams, lotions, powders, oils, powders, waxes, It can be prepared in formulations such as sticks and sprays.

The cosmetic composition of the present invention can be prepared according to various methods known in the art.

Hereinafter, the present invention will be described in more detail through examples. However, the following examples are only for facilitating the understanding of the present invention, and the scope of the present invention is not limited to the examples in any sense.

[Preparation Example 1-5: Preparation of Porous Composite]

According to the composition of Table 1 below, a porous composite of each preparation example containing a natural extract (centella asiatica extract) in the pores of porous particles prepared by attaching titanium dioxide to a core (silica) was prepared.

[Experimental Example 1-6: Preparation of oil-in-water cosmetic composition]

According to the composition of Table 2 below, oil-in-water cosmetic compositions of each experimental example were prepared.

Porous Composite 1: Porous Composite of Preparation Example 1

Porous Composite 2: Porous Composite of Preparation Example 2

Porous Composite 3: Porous Composite of Preparation Example 3

Porous Composite 4: Porous Composite of Preparation Example 4

Porous Composite 5: Porous Composite of Preparation Example 5

[Physical property evaluation 1]

Formulation formation, viscosity, pH and hardness of the cosmetic composition of each experimental example were measured. According to the functional cosmetic test method, 2 g of the cosmetic composition of each experimental example was diluted with 30 ml of purified water and measured using a pH meter (Mettler Toledo). Using an RTC-3005D hardness meter, hardness was evaluated by measuring resistance when pressed to a depth of 10 mm with a measuring bar (speed 30 cm/min). Each physical property measured by the above method is shown in Table 3 below.

As shown in Table 3, the cosmetic composition of Experimental Examples 1-5 containing the porous composite according to the present invention formed a stable formulation with excellent dispersibility, and had a viscosity and hardness within a range capable of providing excellent feeling of use and application. showed On the other hand, the cosmetic composition of Experimental Example 6 containing titanium dioxide and silica instead of the porous composite not only failed to form a formulation, but also showed excessively high viscosity and hardness, which is due to the fact that the cosmetic composition has a stiff feeling of use or uneven application. This means that it can indicate a problem.

[Physical property evaluation 2]

Using the cosmetic composition of each experimental example, the feeling of use and the like were evaluated. Based on the cosmetic evaluation/analysis method Pyeong-29, a 24-hour patch test was conducted, and the feeling of use and softness were evaluated on a 5-point scale, with 5 being the most excellent and 5 being the least heterogeneous and skin irritation. The evaluation results are shown in Table 4 below.

As shown in Table 4, it can be confirmed that the satisfaction with the skin softness decreases with the increase in the titanium dioxide content, and the satisfaction with the feeling of use of the formulation increases with the increase in the silica content.

[Physical property evaluation 3]

The sun protection factor (SPF) of the cosmetic composition of each experimental example was measured by the following method.

UV transmittance was measured according to the 'method for the in vitro determination of UVA protection provided by sunscreen products' test standard of COLIPA (European Cosmetics Association). A sample of the cosmetic composition of each experimental example was applied to a polymethyl methacrylate plate (PMMA 'HELIO PLATE HD6) (coating amount: 1.3 mg X 22 cm2 = 28.6 mg), and UV-2000S (LABSPHERE, INC. USA) was used to 290 to 400 nm region transmittance was measured.

As shown in Table 5, the compositions of Experimental Examples 1, 4, and 5 including porous composites having a high titanium dioxide content were compared to the compositions of Experimental Examples 2 and 3 including porous composites having a relatively low titanium dioxide content. In comparison, it was confirmed that the UV blocking effect was greater.

[Evaluation of physical properties 4]

The potency and transparency of the cosmetic composition of each experimental example were measured in the following manner.

The cosmetic composition of each experimental example was evaluated for sunscreen stability by measuring the potency of the sunscreen agent at weekly intervals for 4 weeks. Samples of the cosmetic composition of each experimental example were collected at intervals of one week, and the sunscreen in the formulation was analyzed by HPLC, and the remaining amount (percentage) was evaluated by potency. In addition, the transparency of the cosmetic composition of each experimental example was observed with the naked eye, and evaluated on a 5-point scale with a higher score as the transparency and the feeling of use were excellent. The evaluation results are shown in Table 6 below.

As shown in Table 6, the compositions of Experimental Examples 1, 4, and 5 including porous composites having a high titanium dioxide content had excellent SPF retention and experimental examples including porous composites having a relatively low titanium dioxide content. It was confirmed that the compositions of 2 and 3 had excellent transparency.

[Evaluation of physical properties 5]

The moisturizing power of the cosmetic composition of each experimental example was evaluated by the following method. After leaving the black artificial leather in a constant temperature and humidity room maintaining a constant temperature and humidity (temperature 22 ± 2 ° C, relative humidity 40 ± 2%) for about 20 minutes, 2 g of the cosmetic composition of each experimental example was applied, Water retention was measured. Using a skin condition measuring device (Cornneometer CM 825, C+k Co., Germany), the moisture retention was measured before application, 10 minutes, 30 minutes, and 1 hour after application, and the moisturizing increase rate was calculated by the following formula 2, The results are shown in Table 7 below.

[Equation 2]

Moisture increase rate (%) = (Ti-To)/Ti X 100

In the above formula,

Ti is the amount of moisture retained in the skin after application of the product,

To is the amount of moisture retained in the skin before application of the product.

As shown in Table 7, the compositions of Experimental Examples 1, 4, and 5 including porous composites having a high content of titanium dioxide were compared to the compositions of Experimental Examples 2 and 3 including porous composites having a relatively low content of titanium dioxide. It was confirmed that the immediate moisturizing effect was excellent, and the effect of preventing moisture evaporation and continuously supplying moisture was excellent.

[Production of sunscreen cream]

According to the composition of Table 8 below, a sunscreen cream was prepared.

Claims (7)

A cosmetic composition for sunscreen comprising a porous composite containing a natural extract in the pores of porous particles prepared by attaching titanium dioxide to a core. The cosmetic composition for sunscreen according to claim 1, wherein the core is silica having an average particle diameter of 2 to 10 μm. The cosmetic composition for sunscreen according to claim 1, wherein the titanium dioxide has an average diameter of 0.1 to 1 μm and an oil absorption of 1.0 ± 0.5 to 15.0 ± 0.5 ml/100g. The cosmetic composition for sunscreen according to claim 1, wherein the pores formed in the porous particles have an average diameter of 0.1 to 3 μm. The cosmetic composition for sunscreen according to claim 1, comprising 30 to 80% by weight of the titanium dioxide and 0.1 to 10% by weight of the natural extract, based on the total amount of the porous composite. The cosmetic composition for sunscreen according to claim 1, wherein the porous composite has an average diameter of 10 to 30 μm. The cosmetic composition for sunscreen according to claim 1, comprising 0.1 to 15% by weight of the porous composite based on the total weight of the cosmetic composition.