KR20210050957A - Cosmetic composition of sunscreen with titanium dioxide powder dispersed in both of oil phase and water phase - Google Patents

Abstract

According to one aspect, according to an oil-in-water type sunscreen cosmetic composition comprising titanium dioxide in both the water phase part and the oil phase part, spreadability and moisture feeling are improved as the oil-in-water type unlike existing oil-in-water type inorganic sunscreen products. The cosmetic composition is stable even with high content of titanium dioxide and has excellent UVA and UVB blocking effects than monodispersion through a double dispersion technology.

Description

Cosmetic composition of sunscreen with titanium dioxide powder dispersed in both of oil phase and water phase}

It relates to a cosmetic composition for UV protection in which titanium dioxide is double-dispersed.

The sunscreen market has been growing rapidly in recent years. In addition, the regulations on the labeling of the UVA blocking index, PA, from PA+++ to PA++++, have been implemented since January 2013 in Japan, and have been in effect since December 2016 in Korea and China. In general, UVA is a light having a long wavelength of about 320 to 400 nm, and it is known to reach the dermal layer with low energy but high transmittance. Taichi, M et al. In the study of Fragrance Journal, 43, p31, 2015., a study on the transmission of glass windows with UVA wavelength was conducted.

The sunscreen to block such ultraviolet rays is prepared by using organic raw materials, inorganic raw materials, or a mixture of both. In particular, conventional sunscreens made of inorganic raw materials such as titanium dioxide and zinc oxide block UV rays through simple reflections rather than chemical reactions on the skin, so consumers have a positive perception that they are mild and less irritating. It is known as one of the most popular formulations. This is because inorganic blockers, which are mineral raw materials, block ultraviolet rays with simple reflection and do not cause a chemical reaction on the skin by absorbing ultraviolet rays, so consumers are recognized as mild raw materials with less irritation. In a trend where the safety of cosmetics is becoming increasingly important, the demand for pre-inorganic products is expected to increase steadily in the future.

However, most of the inorganic blocking pre-products on the market are water-in-oil type in which oil becomes a trauma, and at this time, all inorganic blocking agents are dispersed in the oil phase. This is much more coarse and dry than those treated with hydrophilic coating (silica, alumina, etc.) to disperse the inorganic blocker in the water phase and hydrophobic coating (stearate, dimethicone, triethoxycaprylyl silane, etc.) treatment to disperse the oil phase. The reason lies in having a feeling. Inorganic blockers for water dispersion are known to adhere quickly and strongly to the skin when water evaporates, resulting in a very stiff and dry skin surface (Steven Q. Wang, Henry W. Lim, 『Principles and Practice of Photoprotection』. , Adis (2016), p297) On the other hand, even if an inorganic blocker for oil dispersion is selected, a very large amount is required to produce a high blocking index such as SPF50+ PA++++. It is much more advantageous in terms of stability. For this reason, most of the existing inorganic blocking products have become oil-dispersed water-in-oil type.

However, due to the structure of the oil-based water-in-oil type, any prescription only goes between oily and matte, and the inherent freshness and wateryness resulting from the abundant moisture of the oil-in-water type is very difficult to implement. This is the reason why the concept of'inorganic blocking sunscreen is stuffy' spread widely among consumers, and the reason why the oil-in-water organic blocker gel formulation, which is known to have relatively skin irritation compared to inorganic blockers, is still preferred. In other words, consumers have a latent desire for an inorganic blocker formulation that has high moisture and freshness like an oil-in-water gel formulation, but there is no suitable formulation to satisfy this.

Accordingly, the present inventors developed an oil-in-water type sun-blocking cosmetic composition in which titanium dioxide is double-dispersed in order to overcome the limitations of the inorganic blocking sunscreen as described above, and adopted the oil-in-water type to overcome the limitations of the existing water-in-oil type formulation. At the same time, it has succeeded in making a sunscreen with excellent moisture and application properties by overcoming the limitations of the existing underwater type.

One aspect is an oil-in-water type (O/W) sunscreen comprising titanium dioxide and including an aqueous phase and an oil phase, and provides a sunscreen cosmetic composition comprising titanium dioxide in both the water phase and the oil phase.

Another aspect is the step of dispersing an aqueous phase including titanium dioxide and an aqueous dispersant or an aqueous emulsifier; Dispersing an oil phase containing titanium dioxide and an oil-based dispersant or a water-based emulsifier; And it provides a method of preparing a cosmetic composition for an oil-in-water (O/W) sunscreen comprising the step of agitating the oil phase part and the water phase part.

One aspect is an oil-in-water type (O/W) sunscreen comprising titanium dioxide and including an aqueous phase and an oil phase, and provides a sunscreen cosmetic composition comprising titanium dioxide in both the water phase and the oil phase.

The composition may have characteristics of reducing whitening, increasing applicationability, and increasing moisture sensation.

The term "titanium dioxide" is an inorganic sunscreen that has a white powdery form that is not soluble in water as an oxidized metal. It forms a film as soon as it is applied to the skin, so it has an immediate UV protection effect. Compared to organic sunscreens Since it is much more stable, it has the advantage that the blocking effect lasts longer. In addition, it may have a particularly excellent blocking power in the UVB region.

According to an embodiment, the composition may include only titanium dioxide as a UV blocking active ingredient.

In addition, the composition may add titanium dioxide in a high content through a double dispersion technique for internal and external wounds, and according to the double dispersion, an effective continuous UV blocking effect of titanium dioxide may also exist. (See Fig. 3) For example, when a sunscreen is present on only one side, the applied formulation is completely evaporated or absorbed, and the sunscreen is irregularly distributed over the skin, so it cannot effectively block UV rays. It may be distributed continuously, resulting in increased blocking power.

In one embodiment, the titanium dioxide may be included in 5 to 25% by weight in the composition. For example, 5 to 10% by weight, 5 to 22% by weight, 7 to 20% by weight, 10 to 20% by weight, 10 to 18% by weight, 12 to 15% by weight, 15 to 23% by weight, 15 to 25% by weight It can be %. In this case, when the content of titanium dioxide is less than the above range, there is a problem that ultraviolet rays cannot be effectively blocked, and when it exceeds the above range, there is a concern of skin irritation and skin damage.

In one embodiment, the titanium dioxide of the oil phase and the water phase is 1 to 16% by weight It may be included. For example, 2 to 16% by weight, 3 to 15% by weight, 4 to 14% by weight, 3.5 to 13% by weight, 4 to 12% by weight, 4.5 to 11.5% by weight, 5 to 11% by weight in the water phase and oil phase, respectively %, 5.5 to 10.5% by weight, 6 to 10% by weight, 5 to 9% by weight, 5 to 8.5% by weight, but is not limited thereto.

In one embodiment, the titanium dioxide of the water phase and the oil phase may include a coating on the surface of the powder powder. The coating agent for the titanium dioxide is, for example, palmitic acid, stearic acid, oleic acid, benzoic acid, salicylic acid, alkylsilic acid, chloroacetic acid, triethoxycaprylylsilane, methicone, hydrogendimethicone, cyclomethicone, silica, Aluminum hydroxide. It may be selected from the group consisting of aluminum stearate, alumina, and stearic acid.

In one embodiment, the titanium dioxide of the water phase may include a silica coating, and the titanium dioxide of the oil phase may include an alkylsilane coating.

By the coating of the titanium dioxide, the titanium dioxide of the water phase or the oil phase may be stably dispersed in the water phase or the oil phase.

In one embodiment, the oil may be additionally included in the oil phase. In addition to titanium dioxide, the oil phase may further include at least one oil selected from the group consisting of silicone oil, ester oil, vegetable oil, animal oil, and mineral oil.

In one embodiment, the silicone oil is cyclomethicone, cyclopentasiloxane, cyclohexasiloxane, phenyltrimethicone, dimethicone, dimethiconol, cetyldimethicone, caprylylmethicone, amodimethicone, methyltri It may be selected from the group consisting of methicone, PCA dimethicone, and trisiloxane. The ester oils are, for example, dicaprylyl carbonate, dibutyl adipate, caprylic/caprylglyceride, coco-caprylate/caprate, glyceryl caprate, caprylyl glycol, cetearyl Ethylhexanoate, isopropylmyristate, isocetyl stearate, octyldodecanol, methylperfluoroisobutylether, C12-15 alkelbenzoate, phenethylbenzoate, triethylhexanoin, cetylethyl Hexanoin, choesterylhydroxystearate, diisostearylmaleate, isotridecylisononanoate, isononylsononanoate, neopentylglycoldicaprate, di-C12-13alkylmaleate, butyl Renglycol dicaprylate/dicaprate, butyloctyl salicylate, hydrogenated poly(C6-14 olefin), hydrogenated polydecene, cetylethylhexanoate, ethylhexyl palmitate, ethylhexylmethoxyacryl It may be selected from the group consisting of rene, tribehenin, tricapryline, diethoxyethoxysuccinate, and tricapryline. The vegetable oils are, for example, jojoba oil, avocado oil, macadamia seed oil, rosehip fruit oil, meadow foam seed oil, tea tree leaf oil, squalane, grape seed oil, rice bran oil, sweet almond oil, American hazelnut seed oil, and mountain japonica It can be selected from the group consisting of tree oil, camellia oil, almond oil, palm palm oil, sunflower seed oil, and bazaar oil. The animal oil may be selected from the group consisting of, for example, horse fat, mink oil, egg yolk oil, and squalane, and the mineral oil is, for example, from the group consisting of mineral oil, isododecane, polybutene, and petrolatum. Can be chosen.

In one embodiment, the oils may be ester oils.

In addition, the oils may be those containing 10 to 40% by weight. For example, 12 to 38% by weight, 13 to 36% by weight, 14 to 35% by weight, 15 to 34% by weight, 15.5 to 32% by weight, 15 to 31% by weight, 15.5 to 30% by weight, 16 to 29% by weight %, 16 to 28% by weight, 17 to 27% by weight, 18 to 26% by weight, 19 to 25% by weight, 20 to 24% by weight, 21 to 23.5% by weight, and 21.5 to 23% by weight.

In one embodiment, the water-receiving part may further include an oil-based dispersant or an emulsifier for dispersing the titanium dioxide powder.

In one embodiment, the oil-based dispersant or emulsifier is, for example, polysorbate 20, polysorbate 60, polysorbate 80, glyceryl stearate, lauryl PEG-9 polydimethylsiloxyethyldimethicone , Lauryl PEG-10 tris (trimethylsiloxy) silyl ethyl dimethicone, PEG-10 dimethicone, cetyl PEG/ PEG-10/1 dimethicone, PEG-7 glyceryl cocoate, blood EZ-5 glyceryl stearate, PEG-10 isostearate, PEG-8 diisostearate, PEG-12 diisostearate, PEG-23 stearate, PEG-40 stearate, PEG-40 -100 stearate, PEG-150 stearate, sorbitan stearate, sucrose stearate, olive oil PEG-7 ester, polyglyceryl-2 caprate, polyglyceryl-2 diisostearate, poly Glyceryl-2dipolyhydroxystearate, polyglyceryl-3methylglucose distearate, polyglyceryl-3polydimethylsiloxyethyldimethicone, hydrogenated lecithin, hydrogenated olive oillaurate, Sorbitan sesquioleate, sorbitanolibate, ceteareth-30, ceteareth-20, cetearyl alcohol, behenyl alcohol, PPG-4 ceteth-20, sorbeth-30 tetraolibate, myristyl miri State, sucrose stearate, steareth-2, steareth 21, stearic acid, polyhydroxystearic acid, behenes-20, and behenes-25.

In addition, the oil-based dispersant or emulsifier may be contained in an amount of 0.1 to 3.0% by weight in the composition. For example, it may be 0.1 to 1.0% by weight, 0.3 to 1.5% by weight, 0.5 to 2.0% by weight, 0.7 to 2.5% by weight, 1.0 to 3.0% by weight. When the content of the oil-based dispersant or emulsifier is less than the above range, there is a problem that the dispersion degree of the titanium dioxide powder is lowered and the stability of the formulation is lowered. have.

In one embodiment, the aqueous phase may include an aqueous thickener or an aqueous emulsifier. More specifically, it may include an aqueous phase including titanium dioxide and an aqueous thickener and an aqueous emulsifier.

In one embodiment, the aqueous thickener is, for example, carbomer, sodium polyacrylate, acrylate/C10-30 alkyl acrylate crosspolymer, acrylamide/sodium acrylate copolymer/trideces-6/mineral Salt, ammonium acryloyldimethyltaurate/ Vpicopolymer, acrylate/ ammonium acrylate copolymer, acrylate copolymer, glyceryl acrylate/ acrylic acid copolymer, lithium magnesium sodium silicate, polyacrylamide, montmorillonite, Cetylhydroxyethylcellulose, agar, octylacrylamide copolymer, cellulose, polyacrylate-13, polyacrylate crosspolymer-6, polyisobutene, polyquaternium-7, polyquaternium-10, polyquaternium -51, corn starch, PEG-240/HDI Copolymer Bis-decyltetradeces-20 ether, octylacrylamide copolymer, mannan, gellan gum, hydroxyethyl acrylate/sodium acryloyldimethyltaurate Copolymer, Hydroxyethyl Cellulose, Aluminum Starch Octenyl Succinate, Xanthan Gum, Carob Bean Gum, Sodium Acrylate/ Sodium Acryloyl Dimethyl Taurate Copolymer, Sodium Polyacrylate Starch, Sodium Stearoxy Fiji-Hyde It may be selected from the group consisting of oxyethylcellulose sulfonate.

In addition, the aqueous thickener may be contained in an amount of 0.1 to 2.0% by weight in the composition. For example, it may be 0.1 to 0.5% by weight, 0.3 to 0.7% by weight, 0.5 to 1.0% by weight, 0.7 to 1.2% by weight, 1.0 to 1.3% by weight, 1.0 to 1.5% by weight, 1.0 to 1.7% by weight. When the content of the aqueous thickener is less than the above range, there is a problem in that the formulation stability is deteriorated, and when it exceeds the above range, not only a feeling of thickness and stickiness is felt, but also there is a problem in that the feeling of use is deteriorated due to deterioration of the spreadability.

In addition, the aqueous emulsifier may be selected from the group consisting of, for example, lauryl phosphate, potassium cetyl phosphate, batyl alcohol, cetrimonium chloride, distearyldimonium chloride, and hydrogenated palm glyceride.

In addition, the aqueous emulsifier may be included in the composition in an amount of 1.0 to 5.0% by weight. For example, 1.0 to 5.0 wt%, 1.2 to 5.0 wt% 1.3 to 4.5 wt%, 1.4 to 4.2 wt%, 1.5 to 4.0 wt%, 1.5 to 3.8 wt%, 1.7 to 3.5 wt%, or 2.0 to 3.0 wt% It can be %. At this time, if the content of the aqueous emulsifier is less than the above range, there is a problem that the oil phase cannot be stably emulsified in the aqueous phase, and if it exceeds the above range, there is a problem that irritant contact dermatitis may occur.

The composition according to another embodiment may be in the form of an emulsion. The emulsion refers to a liquid/liquid dispersion system in which one or more other liquid phases that are not mixed in one liquid phase are dispersed, and may be an oil-in-water emulsion having a structure in which an aqueous phase is a continuous phase.

Another aspect may be composed of an aqueous phase portion including titanium dioxide, an aqueous thickener, and an aqueous emulsifier, and an oil phase portion including titanium dioxide, oil, and an oil-based dispersant. The detailed contents of the receiving portion and the paying portion are as described above.

The sunscreen cosmetic composition according to one aspect is a foundation, a solution, an external ointment, a cream, a foam, a nutrient lotion, a softening lotion, a pack, a softening water, an emulsion, a makeup base, an essence, a sunscreen cream, a sun oil, a suspension, an emulsion, It can be prepared in a formulation such as a paste, gel, lotion, powder, oil, emulsion foundation, patch, or spray. In addition, the composition may have a sun protection factor (SPF) of 50 or more, for example, 50 to 95, 50 to 90, 60 to 90, 60 to 85, and ultraviolet A blocking grade PFA ( Protection　Factor of UV-A) is characterized by triple plus (PA++++).

As described above, the composition according to one aspect is dispersed by dividing the inorganic blocker into the inner and outer wounds after seeking a plan to simultaneously combine the inorganic blocker for oil dispersion and the oil-in-water formulation having a high moisture feeling, which is superior to the inorganic blocker for water dispersion. The resulting formulation was obtained (see Fig. 2). The core of this development is the use of high content titanium dioxide powder, but by dividing some for water dispersing and some for oil dispersing to reduce the proportion of internal injuries, a stable oil-in-water formulation is built, and at the same time, water is not used only for water dispersing. It is to prevent the stiff feeling of acidic titanium dioxide from appearing significantly.

In another aspect, the steps of dispersing an aqueous phase including titanium dioxide and an aqueous dispersant or an aqueous emulsifier; Dispersing an oil phase containing titanium dioxide and an oil-based dispersant or a water-based emulsifier; And it provides a method of preparing a cosmetic composition for an oil-in-water (O/W) sunscreen comprising the step of agitating the oil phase part and the water phase part.

In one embodiment, it may include cooling the stirred composition.

The oil phase part, the water phase part, and the coating are the same as described above.

In one embodiment, the titanium dioxide of the water phase and the oil phase may include a coating on the surface of the powder powder. The coating agent for the titanium dioxide is, for example, palmitic acid, stearic acid, oleic acid, benzoic acid, salicylic acid, alkylsilic acid, chloroacetic acid, triethoxycaprylylsilane, methicone, hydrogendimethicone, cyclomethicone, silica, Aluminum hydroxide. It may be selected from the group consisting of aluminum stearate, alumina, and stearic acid.

In one embodiment, the titanium dioxide of the water phase may include a silica coating, and the titanium dioxide of the oil phase may include an alkylsilane coating.

In one embodiment, the titanium dioxide of the oil phase or the water phase may be contained in an amount of 1 to 16% by weight. For example, it may be 2 to 14% by weight, 4 to 14% by weight, 4.5 to 13% by weight, 5 to 12% by weight, 5 to 11% by weight, 4 to 10% by weight, 4 to 9% by weight. Preferably it may be about 5 to 8% by weight.

According to the oil-in-water UV-blocking cosmetic composition comprising titanium dioxide according to one aspect, it exhibits a much higher moisture and freshness compared to conventional inorganic blocking products containing titanium dioxide, while maintaining an excellent UV blocking effect that is not inferior to it. , Excluding organic blockers and using only inorganic blockers alone, the formulation has a mild effect.

1 is a schematic diagram illustrating the absence of an emulsion of a water-in-oil inorganic blocking product and an oil-in-water inorganic blocking product on the market.
2 is a schematic diagram of an oil-in-water formulation in which titanium dioxide powder according to an aspect is double-dispersed in the inner and outer wounds.
3 is a schematic diagram illustrating a UV blocking mechanism of an oil-in-water formulation in which titanium dioxide powder according to an aspect is double-dispersed in the inner and outer wounds.
4 is an image showing the composition of Example 1 and Comparative Example 2 applied on the back of the hand.
5 is an image showing the sensory test results of Example 1 and Comparative Example 2.

Hereinafter, a preferred embodiment is presented to aid the understanding of the present invention. However, the following examples are provided for easier understanding of the present invention, and the contents of the present invention are not limited by the following examples.

The above description of the present invention is for illustrative purposes only, and those of ordinary skill in the art to which the present invention pertains will be able to understand that other specific forms can be easily modified without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and are not limiting.

[Example]

Example 1. Preparation of oil-in-water double-dispersion cosmetic composition

400g of the composition in Table 1 was weighed and the aqueous phase was dispersed using a homomixer (HOMOGENIZING MXER Model 2.5 PRIX, Japan). Thereafter, after adding the titanium dioxide for water dispersion and the thickener, stirred sufficiently, and the oil phase in which the titanium dioxide for oil dispersion was dispersed was added to proceed with emulsification.

에서 5,000 rpm으로 5분간 분산시킨 다음, 수상에 B와 C를 정확하게 계량하여 혼합한 후, 7,000 rpm로 5분 뭉침이 생기지 않도록 충분히 교반하였다. 상기 교반한 수상을 70

를 유지시켰으며, 상기 유상 분산액을 2회에 나누어 투입하고 호모믹서를 이용하여 7,000rpm에서 5분 균일하게 유화시켰다. 마지막으로 유화 완료 후 내용물을 30

까지 냉각하였다.Specifically, for the production of the base, accurately weigh the A phase and gage it in a container, and then use a homomixer.

After dispersing at 5,000 rpm for 5 minutes, B and C were accurately weighed and mixed in the aqueous phase, and then sufficiently stirred at 7,000 rpm for 5 minutes so as not to agglomerate. 70 the stirred aqueous phase

Was maintained, and the oily dispersion was added in two portions, and uniformly emulsified for 5 minutes at 7,000 rpm using a homomixer. Finally, after the oil painting is complete, the contents are

Cooled to.

Comparative Example 1. Preparation of oil-in-water monodisperse cosmetic composition

It was prepared in the same manner as in Example 1, except that the composition ratio shown in Table 1 was used.

This comparative example is the same oil-in-water type as in Example 1, and titanium dioxide is dispersed only in the oil phase.

Comparative Example 2. Preparation of water-in-oil monodisperse cosmetic composition

400g of the composition in Table 1 was weighed and the oil phase including titanium dioxide for oil dispersion was dispersed using a homomixer (HOMOGENIZING MXER Model 2.5 PRIX, Japan). Next, an aqueous phase was added to perform emulsification.

까지 냉각시켰다.Specifically, for the preparation of the base, the D phase was precisely weighed and gyerang in a container, and then dispersed for 10 minutes at 7,000 rpm at room temperature using a homomixer. Next, after accurately weighing and mixing, it was uniformly emulsified for 5 minutes at 7,000 rpm. Finally, the above contents 30

Cooled to.

This comparative example is a water-in-oil type, and titanium dioxide is dispersed only in the oil phase.

Prize Raw material name Usage Example 1
(weight%) Comparative Example 1
(weight%) Comparative Example 2
(weight%) A Purified water menstruum Balance Balance Balance Hydrogenated Palm Glyceride Water-based emulsifier 2 2 - antiseptic antiseptic Appropriate amount Appropriate amount Appropriate amount B Silica coated titanium dioxide UV protection 7.5 - - C Acrylate copolymer Water-based thickener One One - D Ester oil menstruum 22 45 45 Alkylsilane coated titanium dioxide UV protection 7.5 15 15 Sorbitansquioleate Dispersant/Oil-based emulsifier One One One Polyglyceryl-3 polydimethylsiloxyethyldimethicone Oil-based emulsifier - - 2 Disteadimonium hectorite Bounded thickener - - One

[Experimental Example]

Formulation stability test

Changes in hardness after storage of the compositions prepared in Example 1 and Comparative Example 1 at 25°C, 5°C, and 50°C on the same day, next day, one week and one month in a plastic container (measurement condition: room temperature (storage temperature is not room temperature) In case, it was measured after standing at room temperature for 30 minutes), LV04/30rpm/1 minute), and pH change was observed.

division Example 1 Comparative Example 1 exam Measurement date Storage temperature (℃) Viscosity day 25 15 16 Next day 25 20 12 1 week later 25 21 Separation 4 21 Separation 45 20 Separation A month later 25 21 Separation 4 21 Separation 45 20 Separation pH day 25 7.45 7.08 Next day 25 7.55 7.11 1 week later 25 7.62 7.23 4 7.51 7.29 45 7.69 7.29 A month later 25 7.68 7.18 4 7.58 7.21 45 7.67 7.30

As a result, as shown in Table 2, in the case of Comparative Example 1, there was no significant change in the pH according to the measurement time, but the hardness decreased the next day after manufacture, and after one week, it was confirmed that the stability was unstable due to separation into water and oil. Became. On the other hand, in the case of Example 1, it was confirmed that there was no significant change in both hardness and pH according to the measurement period. This is because in the case of Comparative Example 1, all titanium dioxide of the same content as in Example 1 was included only in the inner phase, and the content of the ester oil required to disperse the high concentration of titanium dioxide was also increased, and the ratio of the entire inner case was very high.

On the other hand, in the case of Example 1, titanium dioxide was divided and dispersed in the inner wound and the outer wound, and therefore, it was found that the overall ratio of the inner wound was low and the stability was excellent. As a result, it was found that the composition according to an embodiment has formulation stability and pH change stability.

UV blocking power check

The sunprotection factor (SPF) was measured according to the method and standard for measuring the sun protection effect according to the Cosmetics Act. Specifically, in the UV SPF blocking test, through medical history investigation and skin condition diagnosis, a subject who has been bonded to the test purpose is selected, and UV rays are irradiated with the Multiport Solar UV Simulator (601-300w) on the back where the product is not applied, and 16~24 After a period of time, the MED of the non-applied site was measured.

As a result, as shown in Table 3, in the case of Example 1, since both the inner and outer wounds contained titanium dioxide, it was confirmed that both the blocking power of UVA and UVB was higher than that of Comparative Example 1. As described above, if titanium dioxide is dispersed in only one phase, after application, when the formulation is evaporated and absorbed, titanium dioxide particles remain only in the place where the dispersed phase was present, so that the titanium dioxide particles are irregularly distributed on the skin. This is because titanium dioxide particles remain in all the places where the phase was located, enabling more continuous blocking.

Therefore, it was proved that the composition according to an embodiment can effectively block UVA and UVB than a formulation in which titanium dioxide is monodispersed.

Example 1 Comparative Example 1 Water-dispersed titanium dioxide content (% by weight) 7.5 - Oil-dispersed titanium dioxide content (% by weight) 7.5 15 SPF* 52.0 35.5 PFA* 10.0 8.19

Sensory evaluation

For the compositions prepared in Example 1 and Comparative Example 2, white turbidity, thickness, application, moisture, smoothness after absorption, and residual feeling were evaluated. In the case of Comparative Example 2, the formulation was prepared in the same manner as the inorganic barrier products widely sold on the market, and it was a water-in-oil type and a formulation in which titanium dioxide was monodispersed in only one oil phase.

Evaluation targets are women aged 25 to 45, and the compositions prepared in Example 1 and Comparative Example 2 were applied to the back of the hand, and immediately subjective evaluation was made on items such as white turbidity and feeling of use. Evaluation of each item was performed based on the blot method criteria of very high (5 points), high (4 points), moderate (3 points), low (2 points), and very low (1 point).

As a result, as shown in FIG. 5, in the case of Example 1, it was confirmed that the white turbidity (refer to FIG. 4), a feeling of thickness, and a feeling of residual are significantly lower than that of Comparative Example 2.

In addition, in the case of spreadability, moisture, and smoothness, it was confirmed that it was remarkably superior to that of Comparative Example 2. This is due to the difference between the oil-in-water and water-in-oil formulations. Due to the above differences, the oil-in-water formulation is superior to the water-in-oil formulation in terms of feeling of use.

That is, the above result is that the composition according to an embodiment improves the cloudiness that may occur in the conventional water-in-oil monodisperse inorganic blocker containing titanium oxide, and has a low thickness and weight, as well as excellent application and moisture. It means that it is an improved and excellent UV protection product.

Claims (11)

As an oil-in-water type (O/W) sunscreen comprising titanium dioxide and including an aqueous phase and an oil phase, a sunscreen cosmetic composition comprising titanium dioxide in both the water phase and the oil phase. The cosmetic composition of claim 1, wherein the titanium dioxide is contained in an amount of 5 to 25% by weight. The method according to claim 1, wherein the oil phase or the water phase is 1 to 16% by weight of titanium dioxide The composition that is included. The cosmetic composition according to claim 1, wherein the oil phase part contains an oil phase part containing an oil-based dispersant or an emulsifier. The cosmetic composition according to claim 4, wherein the oil-based dispersant or emulsifier is contained in an amount of 0.1 to 3.0% by weight. The cosmetic composition according to claim 1, wherein the water-based part contains a water-based thickener or a water-based emulsifier. The cosmetic composition according to claim 6, wherein the aqueous thickener is contained in an amount of 0.1 to 2.0% by weight. The cosmetic composition according to claim 6, wherein the aqueous emulsifier is contained in an amount of 1.0 to 5.0% by weight. The cosmetic composition according to claim 1, wherein the oily part contains oils. The cosmetic composition according to claim 1, wherein white cloudiness is reduced, application properties are increased, and moisture sensation is increased. Dispersing an aqueous phase comprising titanium dioxide and an aqueous dispersant or an aqueous emulsifier;
Dispersing an oil phase containing titanium dioxide and an oil-based dispersant or a water-based emulsifier; And
A method for producing an oil-in-water (O/W) sunscreen cosmetic composition comprising the step of agitating the oil phase part and the water phase part.

Images