KR102613275B1 - Oil in water type cosmetic composition for uv protection comprising two inorganic powders - Google Patents

Abstract

According to an embodiment of the present invention, an oil-in-water cosmetic composition for sunscreen is provided. The cosmetic composition includes a sunscreen and a flow regulator, and the sunscreen includes an inorganic powder, and the inorganic powder may include titanium dioxide and zinc oxide.

Description

Oil-in-water type cosmetic composition for UV protection containing two types of inorganic powders {OIL IN WATER TYPE COSMETIC COMPOSITION FOR UV PROTECTION COMPRISING TWO INORGANIC POWDERS}

The present invention relates to an oil-in-water type UV-blocking cosmetic composition containing two types of inorganic powders. Specifically, titanium dioxide and zinc oxide are included as the inorganic powders, thereby providing excellent UV-blocking efficacy with low whiteness when applied to the skin. It relates to an underwater type UV blocking composition that can be used.

Recently, as consumer awareness of the need for UV protection has expanded not only during sports and leisure activities but also in everyday life, the demand for UV protection products is increasing.

Since these sunscreen products contain an excessive amount of sunscreen to improve sunscreen effectiveness, they appear white when applied to the skin, and have the disadvantage of making the skin appear cloudy or shiny. In addition, if the content of this sunscreen is lowered to reduce the white clouding phenomenon, there is a problem in that the UV blocking effect decreases.

Meanwhile, oil-in-water sunscreens with high UV blocking power typically contain emulsifiers to ensure stability. At this time, emulsifiers are mainly polyethylene glycol-based, higher alcohol-based, or higher fatty acid-based emulsifiers. However, in the case of polyethylene glycol-based emulsifiers, there are issues related to skin irritation and environmental pollution, and in the case of higher alcohol or higher fatty acid-based emulsifiers, the process is difficult because they feel heavy and require a heating process at a high temperature of 70℃ or higher. has a drawback.

The present invention is intended to solve the above problems, and the purpose of the present invention is to provide a cosmetic composition for sunscreen that provides excellent sunscreen efficacy while exhibiting low whiteness when applied to the skin and is easy to manufacture.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

According to an embodiment of the present invention, an oil-in-water cosmetic composition for sunscreen is provided. The cosmetic composition includes a sunscreen and a flow regulator, the sunblock includes an inorganic powder, and the inorganic powder may include titanium dioxide and zinc oxide.

Additionally, the inorganic powder may be included in an amount of 10 to 30% by weight based on the total weight of the composition.

Additionally, the weight ratio of the zinc oxide to the titanium dioxide may be 1:0.5 to 3.

Additionally, the titanium dioxide may be included in an amount of 1 to 20% by weight based on the total weight of the composition.

Additionally, the zinc oxide may be included in an amount of 1 to 30% by weight based on the total weight of the composition.

Additionally, the titanium dioxide may be included in the outer phase of the cosmetic composition, and the zinc oxide may be included in the inner phase of the cosmetic composition.

Additionally, the flow regulator may include Hydroxypropyl Methylcellulose Stearoxy Ether.

Additionally, the flow regulator may be included in an amount of 0.01 to 10% by weight based on the total weight of the composition.

Additionally, the cosmetic composition may be emulsified at a temperature of 30 to 60°C.

Additionally, the cosmetic composition may not contain an emulsifier.

According to an embodiment of the present invention, a method for producing an oil-in-water cosmetic composition for sunscreen is provided. The method includes dispersing the aqueous phase; Dispersing the oil phase; Primary mixing titanium dioxide and a flow regulator in the water phase; And it may include the step of secondarily mixing the oil phase portion and zinc oxide with the first mixed mixture.

Additionally, the primary mixing step and the secondary mixing step may be performed at a temperature of 30 to 60°C.

Additionally, the weight ratio of the zinc oxide to the titanium dioxide may be 1:0.5 to 3.

As the composition according to the present invention uses a mixture of two types of inorganic powders, titanium dioxide and zinc oxide, it has low whiteness when applied to the skin and can provide efficient ultraviolet ray blocking effect even when a relatively small amount is used.

In addition, because the composition according to the present invention does not contain an emulsifier, irritation to the skin is minimized and it can provide a light and refreshing feeling.

In addition, the composition according to the present invention has the advantage of being simple in the manufacturing process because it can be manufactured at a relatively low temperature and does not require a heating process.

In order to more fully understand the drawings cited in the detailed description of the present invention, a brief description of each drawing is provided.
Figure 1 is a photograph related to the evaluation of the effect of reducing white cloudiness according to examples and comparative examples of the present invention.

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. In general, the nomenclature used herein is well known and commonly used in the art. Additionally, when describing embodiments of the present invention, if detailed descriptions of related known configurations or functions are judged to impede understanding of the embodiments of the present invention, the detailed descriptions will be omitted. In addition, embodiments of the present invention will be described below, but the technical idea of the present invention is not limited or limited thereto and may be modified and implemented in various ways by those skilled in the art.

The present invention relates to an oil-in-water cosmetic composition for sunscreening, and specifically, by including a sunscreen composed of two types of inorganic powders and a flow regulator, it can provide excellent sunblocking efficacy while reducing whiteness when applied to the skin. It is a composition that has

The cosmetic composition of the present invention may include a sunscreen and a flow regulator.

Sunscreens can serve to provide a blocking effect from ultraviolet rays by absorbing, reflecting or scattering ultraviolet rays.

Depending on the embodiment, the sunscreen may include two types of inorganic powders. Inorganic powders are not absorbed into the skin, act only on the surface, and may have physical properties that reflect and disperse ultraviolet rays. Since inorganic powder forms a film immediately upon application to the skin, it provides an immediate UV-blocking effect, and its stable properties allow it to provide a more continuous blocking effect.

Depending on the embodiment, the inorganic powder may be included in an amount of 10 to 30% by weight, specifically 12 to 27% by weight, and more specifically 15 to 25% by weight, based on the total weight of the composition. If the inorganic powder is included in less than 10% by weight of the total weight of the composition, the UV blocking effect may be minimal, and if it is included in more than 30% by weight, formulation stability and feeling of use may be reduced.

Depending on the embodiment, the inorganic powder may include titanium dioxide and zinc oxide.

Titanium dioxide provides excellent UV blocking power in the UVB (280 to 320nm) ultraviolet range, and zinc oxide provides UV blocking power over a wider range, specifically in the UVA (315 to 400nm) and UVB ultraviolet ranges. You can. The present invention includes two types of inorganic powder, titanium dioxide and zinc oxide, so that a high UV protection index can be achieved even with a relatively small content. In addition, when using a mixture of titanium dioxide and zinc oxide as an inorganic powder, the white clouding phenomenon can be minimized compared to the case where only one type of inorganic powder is used.

Depending on the embodiment, titanium dioxide may be included in the outer layer of the cosmetic composition, and zinc oxide may be included in the inner phase of the cosmetic composition. If the sunscreen is present in only one of the internal and external phases, if the composition applied to the skin evaporates or is absorbed as a whole, the sunscreen may be distributed irregularly on the skin and may not effectively block ultraviolet rays. However, the present invention has the feature that since the sunscreen is included in both internal and external wounds, the sunscreen is distributed continuously, and as a result, the sunscreen effect can be maximized.

Depending on the embodiment, the weight ratio of zinc oxide to titanium dioxide may be 1:0.5 to 3, specifically 1:1 to 2, and more specifically 1:1.2 to 1.5. If titanium dioxide and zinc oxide are included beyond the above weight ratio, the UV blocking effect may be reduced or white clouding may become excessive when the composition is applied to the skin.

Depending on the embodiment, titanium dioxide may be included in 1 to 20% by weight, specifically 1 to 16% by weight, based on the total weight of the composition. If titanium dioxide is included in less than 1% by weight based on the total weight of the composition, the UV blocking effect in the UVB region may be reduced, and if it is included in more than 20% by weight, spreadability may be reduced.

Depending on the embodiment, zinc oxide may be included in an amount of 1 to 30% by weight, specifically 1 to 25% by weight, and more specifically 5 to 25% by weight, based on the total weight of the composition. If zinc oxide is included in less than 1% by weight of the total weight of the composition, the UV blocking effect may be reduced, and if it is included in more than 30% by weight, the feeling of use may be reduced.

The flow regulator can serve to stably disperse various components, including sunscreens, in an oil-in-water cosmetic composition.

The flow control agent may include Hydroxypropyl Methylcellulose Stearoxy Ether. Hydroxypropylmethylcellulose stearoxyether can appropriately control the viscosity of the composition and ensure that the materials in the composition are uniformly dispersed.

Depending on the embodiment, the flow regulator may be included in an amount of 0.01 to 10% by weight, specifically 0.01 to 6% by weight, based on the total weight of the composition. If the flow regulator is included in less than 0.01% by weight of the total weight of the composition, the aqueous and oily substances may not be properly mixed, and if it is included in more than 10% by weight, the viscosity of the composition becomes too high and the materials in the composition are not uniformly dispersed. It may not be possible.

Depending on the embodiment, the cosmetic composition may not contain an emulsifier. This can be interpreted to mean not only that no emulsifier is included at all, but also that it is not included as an effective ingredient in an effective amount generally acceptable in the art. Specifically, if the emulsifier is included in less than 1% by weight, 0.5% by weight, 0.1% by weight, 0.05% by weight, 0.01% by weight, or 0.001% by weight based on the total weight of the composition, it can be considered as not containing an emulsifier.

In general, water-based compositions containing sunscreen contain emulsifiers to stably disperse the sunscreen, but these emulsifiers cause environmental pollution, cause skin irritation, and provide a heavy or sticky feeling, thereby reducing the feeling of use. There was a problem. However, since the present invention does not substantially contain an emulsifier and uses a flow regulator for stable dispersion of the sunscreen, it can ensure formulation stability, solve problems caused by the use of emulsifiers, and provide a light and refreshing feeling of use. Also, skin irritation can be minimized.

Depending on the embodiment, the cosmetic composition may be emulsified at a temperature of less than 70°C, specifically at a temperature of 30 to 60°C, and more specifically at a temperature of 40 to 50°C. When the cosmetic composition is emulsified in the above temperature range, the viscosity of the continuous phase is appropriately formed, so that the water phase and the oil phase can be maintained in a stable emulsion formulation. When a cosmetic composition is emulsified at a high temperature of 70°C or higher, the viscosity of the continuous phase decreases, and the lipophilicity of the component that emulsifies the water phase and the oil phase increases, which may reduce emulsion stability, and when it is emulsified at a low temperature below 30°C, As the viscosity of the water phase increases, the emulsification process of the water phase and oil phase may not occur.

In general, when using an emulsifier to stably disperse a sunscreen, there is a disadvantage that the process is very difficult because a heating process must be performed at a temperature of 70°C or higher. However, since the present invention does not substantially contain an emulsifier and uses a flow regulator for stable dispersion of the sunscreen, the emulsification process is performed at a relatively low temperature for a short time, making the manufacturing process simple.

Depending on the embodiment, the cosmetic composition of the present invention may contain other ingredients commonly used in the art, such as moisturizers, pH adjusters, isotonic agents, stabilizers, and preservatives, within a range that does not impair the main effect of the present invention. , preservatives, ultraviolet absorbers, disinfectants, blockers, antioxidants, organic pigments, inorganic pigments, fragrances, vitamins, etc. may be further included. The mixing amount of the above components can be easily selected by a person skilled in the art within a range that does not impair the purpose and effect of the present invention. However, it is not limited to this, and may further include various ingredients depending on the formulation of the cosmetic composition of the present invention.

As such, the present invention includes titanium dioxide and zinc oxide as inorganic powders, so that when applied to the skin, it has low whiteness and can provide excellent ultraviolet ray blocking effect for a long time. In addition, since the present invention uses a flow regulator without substantially containing an emulsifier to disperse the material, it can provide a light and refreshing feeling, minimize skin irritation, and have the characteristics of a simple manufacturing process. there is.

The oil-in-water cosmetic composition for sunscreening of the present invention can be manufactured through the following manufacturing method. The manufacturing method of the present invention includes dispersing the aqueous phase portion; Dispersing the oil phase; First mixing step; And it may include a secondary mixing step.

First, the step of dispersing the aqueous phase may be performed by mixing the aqueous phase containing purified water and polyol. Specifically, purified water, polyol, etc. may be mixed and then heated to disperse the aqueous phase. At this time, the heating temperature may be a temperature of less than 70°C, specifically a temperature of 30 to 60°C, and more specifically a temperature of 40 to 50°C, but is not limited thereto.

In the water phase, polyols can play a role in supplying or maintaining moisture in the skin. For example, the polyol is one or more selected from the group consisting of butylene glycol, propanediol, dipropylene glycol, and pentylene glycol. It may include, but is not limited to this.

Depending on the embodiment, the water phase may further include a thickener. The thickener ensures that the formulation has an appropriate viscosity, and as a sunscreen, it can serve to ensure that the inorganic powder is dispersed rather than settling within the formulation. For example, thickeners include Carbomer, Polyacrylate Crosspolymer-6, Ammonium Acryloyldimethyltaurate/VP Copolymer, acrylate/ 1 selected from the group consisting of Acrylates/C10-30 Alkyl Acrylate Crosspolymer and Sodium Acrylate/Sodium Acryloyldimethyl Taurate Copolymer. It may include more than one species, but is not limited thereto.

Next, the step of dispersing the oil phase may be performed by mixing the oil phase containing oil. Specifically, after mixing the oil phase containing oil, the oil phase may be dispersed by heating. For example, the oil may include one or more selected from the group consisting of ester-based oil, hydrocarbon-based oil, and silicone-based oil, but is not limited thereto.

Depending on the embodiment, the ester oil is hexyl laurate, dicaprylyl carbonate, diisostearyl malate, butylene glycol dicaprylate/dicaprate. (Butylene glycol dicaprylate/dicaprate), Cetyl ethylhexanoate, Triethylhexanoin, Dicetearyl dimer dilinoleate, Caprylic/Capric Triglyceride (Caprylic/Capric Triglyceride), Polyglyceryl-2 Triisostearate, Pentaerythrityl Tetraisostearate, etc., and hydrocarbon-based oil. It contains at least one selected from the group consisting of polybutene, hydrogenated polyisobutene, and squalane, and the silicone oil includes phenyl trimethicone and dimethicone. It may include one or more types selected from the group consisting of (Dimethicone), etc., but is not limited thereto.

Next, the first mixing step can be performed by mixing titanium dioxide and a flow regulator in the water phase. Specifically, titanium dioxide for water dispersion and hydroxypropylmethylcellulose stearoxyether as a flow regulator may be added to the water phase and then stirred under conditions of 2,000 to 3,000 rpm. Here, titanium dioxide can play a role in providing excellent ultraviolet ray blocking power in the UVB ultraviolet range. In addition, the flow regulator can ensure that titanium dioxide is uniformly and stably dispersed in the water phase and can be adjusted to form an appropriate viscosity.

Depending on the embodiment, the flow regulator and titanium dioxide may be sequentially introduced into the water phase. For example, hydroxypropylmethylcellulose stearoxyether may be added to the aqueous phase and stirred to preferentially dissolve the flow regulator, and then titanium dioxide may be added to the aqueous phase in which the flow regulator is dissolved and stirred. .

Alternatively, the flow control agent may be added to the aqueous phase during the step of dispersing the aqueous phase. For example, in the step of dispersing the aqueous phase, hydroxypropylmethylcellulose stearoxy ether, purified water, and polyol are mixed, heated at a temperature of less than 70° C. to disperse the aqueous phase, and then in the first mixing step, water Titanium dioxide can be mixed at the top and stirred at 2,000 to 3,000 rpm.

Next, the secondary mixing step can be performed by mixing the oil phase and zinc oxide with the primary mixed mixture. Specifically, zinc oxide for oil phase and oil dispersion may be added to the first mixed mixture and then stirred under conditions of 6,000 to 8,000 rpm. Here, zinc oxide can play a role in providing ultraviolet ray blocking power over a wider range, specifically in the ultraviolet rays of UVA and UVB.

Depending on the embodiment, the oil phase and zinc oxide may be sequentially added to the first mixed mixture. For example, the oil phase may be added to the first mixed mixture and then stirred to preferentially disperse the oil phase and the water phase, and then zinc oxide may be added and stirred.

Depending on the embodiment, the first mixing step and the second mixing step may be performed at a temperature of less than 70°C, specifically at a temperature of 30 to 60°C, and more specifically at a temperature of 40 to 50°C. When the above step is performed in the above temperature range, the viscosity of the continuous phase is appropriately formed and the water phase and oil phase can be maintained in a stable emulsion formulation. If the above step is performed at a high temperature of 70℃ or higher, the viscosity of the continuous phase may decrease and the lipophilicity of the component that emulsifies the water phase and oil phase may increase, which may reduce emulsion stability, and if performed at a low temperature of less than 30℃. , the viscosity of the aqueous phase increases, so emulsification of the aqueous phase and the oil phase may not occur.

In general, when using an emulsifier to stably disperse a sunscreen, there is a disadvantage that the process is very difficult because a heating process must be performed at a temperature of 70°C or higher. However, since the method of the present invention does not substantially use an emulsifier and uses a flow regulator for stable dispersion of the sunscreen, the emulsification process is performed at a relatively low temperature for a short time, making the overall process simple.

Depending on the embodiment, the weight ratio of zinc oxide to titanium dioxide may be 1:0.5 to 3, specifically 1:1 to 2, and more specifically 1:1.2 to 1.5. If titanium dioxide and zinc oxide are included outside of the above weight ratio range, the UV blocking effect of the prepared composition may be reduced or white clouding may become excessive when the composition is applied to the skin.

Depending on the embodiment, other additional ingredients may be added in the step of dispersing the water phase, the step of primary mixing, and/or the step of secondary mixing. Additional ingredients may include, but are not limited to, functional ingredients or additives such as stabilizers, thickeners, antioxidants, sunscreens, pigments, fragrances, and preservatives. The additional component may be mixed first into the oil phase and then mixed and emulsified with the water phase, or may be mixed first into the water phase and then mixed and emulsified with the oil phase, or may be added separately after mixing the water phase and the oil phase.

In addition, the process of mixing the water phase and the oil phase and stirring them may be performed as known to those skilled in the art, but the process may be changed at an appropriate level to suit the purpose of use.

Depending on the embodiment, after the secondary mixing step, a step of cooling to a temperature of 10 to 30° C. may be further included. Through this cooling process, particles formed as a sunscreen can be stably formed in the composition.

In this way, by adding titanium dioxide for water dispersion and zinc oxide for oil dispersion in the first mixing step and the second mixing step, respectively, the white clouding phenomenon can be minimized compared to the case of using only one type of sunscreen, and the composition Even if only a small amount is applied to the skin, it can provide excellent UV protection. In addition, the cosmetic composition produced by this manufacturing method has the characteristic that since it contains a sunscreen on both the inner and outer wounds, the sunscreen is distributed continuously, resulting in a maximized sunscreen effect.

In addition, in the present invention, since a flow regulator is used without substantially using an emulsifier to emulsify the oil phase and the water phase, it can provide a light and refreshing feeling of use, minimize skin irritation, and provide a relatively short period of time at low temperature. Because the emulsification process takes place over time, the manufacturing process is simple.

[Experimental example]

Below, examples are shown to further explain the present invention in more detail, but the present invention is not limited thereto.

Preparation of examples and comparative examples

(1) Preparation of Examples 1 to 3

Examples of compositions according to the present invention were prepared using the ingredients listed in Table 1 below. The unit of ingredient content in Table 1 is weight%.

Examples 1 to 3 are compositions in which the content and ratio of titanium dioxide and zinc oxide were adjusted within the scope of the examples of the present invention.

Specifically, purified water was dispersed and heated to 40°C to prepare the aqueous phase. A thickener was added to the aqueous phase and stirred sufficiently. Then, a flow regulator was added to the aqueous phase and further stirred. After the flow regulator was dissolved, titanium dioxide for water dispersion was added to the water phase and thoroughly stirred with a homomixer. Afterwards, zinc oxide for oil dispersion was added and stirred at 7,000 rpm for 7 minutes using a homomixer, and then cooled to 30° C. to complete the compositions of Examples 1 to 3.

(2) Preparation of Comparative Examples 1 to 4

A comparative example of a composition according to the present invention was prepared using the components listed in Table 2 below. The unit of ingredient content in Table 2 is weight%.

Comparative Examples 1 and 2 are compositions excluding one of the two types of sunscreen, and Comparative Examples 3 and 4 are compositions in which the ratio of titanium dioxide and zinc oxide was adjusted outside the scope of the examples of the present invention.

Specifically, the composition of Comparative Example 1 was prepared by excluding the process of adding zinc oxide in the production methods of Examples 1 to 3, and the composition of Comparative Example 1 was prepared by excluding the process of adding titanium dioxide in the production methods of Examples 1 to 3. Composition 2 was prepared, and compositions of Comparative Examples 3 and 4 were prepared in the same manner as in Examples 1 to 3.

Experiment example

(1) Experimental Example 1: Evaluation of the effect of reducing white turbidity

After applying the compositions according to Examples 1 to 3 and Comparative Examples 1 to 4 to the skin, the degree to which white clouding occurred was visually evaluated, and the results are shown in Table 3 and Figure 1. Among the Examples, representative evaluation photos of Example 1 are shown in Figure 1 (a), and representative evaluation photos of Comparative Examples 1 and 2 among the Comparative Examples are shown in Figures 1 (b) and (c), respectively.

As a result of the experiment, in the case of Examples 1 to 3, it was found that the white turbidity phenomenon was hardly observed, showing that the effect of reducing the white turbidity phenomenon was very excellent.

Meanwhile, in the case of Comparative Examples 1 and 2 in which one of titanium dioxide and zinc oxide was excluded, excessive whiteness appeared in all cases, and the composition did not adhere evenly to the skin, confirming that the effect of reducing the whiteness phenomenon was not good. .

In addition, in the case of Comparative Examples 3 and 4, in which titanium dioxide and zinc oxide were included so that the weight ratio was outside the range of the Example, the whitening phenomenon was reduced compared to Comparative Examples 1 and 2, but the whitening phenomenon was clearly observed. It was confirmed that the reduction effect was minimal.

That is, it was found that the composition according to the present invention provides an excellent white cloud reduction effect and a feeling of use by using a mixture of titanium dioxide and zinc oxide as a sunscreen and adjusting the weight ratio of the two components appropriately.

(2) Experimental Example 2: Evaluation of UV blocking effect

Examples 1 to 3 and Comparative Examples 1 to 4 were evaluated for UV protection, and the results are shown in Table 4.

The experimental method is as follows. After the samples of the above examples and comparative examples were applied on a PMMA plate in an amount of 32 mg/cm2, the UV protection index SPF/PA was measured using a UV-2000 spectrophotometer (Labsphere). SPF indicates the UV blocking effect in the UVB area, and PA indicates the UV blocking effect in the UVA area. The larger each value, the better the UV blocking effect can be interpreted.

As a result of the experiment, in the case of Examples 1 to 3, SPF was measured as 40 or more and PA 4+ (i.e., PFA 16 or more), and it was found that the UV blocking effect in both UVA and UVB regions was very excellent. In particular, in the case of Example 1, it was found that the UV protection effect was maximized by measuring SPF 50 or more and PA 4+ or more.

On the other hand, in the case of Comparative Example 1 in which zinc oxide was excluded, the PA 3+ (i.e., PFA 8 or more and less than 16) was measured to be very low, and the ultraviolet ray blocking effect in the UVA region was very poor compared to Examples 1 to 3. In the case of Comparative Example 2, in which titanium dioxide was excluded, the SPF was measured as low as 35, confirming that the ultraviolet ray blocking effect in the UVB region was very poor compared to Examples 1 to 3.

In addition, in the case of Comparative Examples 3 and 4, in which titanium dioxide and zinc oxide were included so as to deviate from the weight ratio range of the Examples, PA 3+ (i.e., PFA 8 or more and less than 16) was measured to be very low, and in Examples 1 to 3, In comparison, it was confirmed that the UV blocking effect in the UVA region was very poor.

That is, the composition according to the present invention uses a mixture of titanium dioxide and zinc oxide as a sunscreen and the weight ratio of the two components is appropriately adjusted, providing a very excellent sunscreen effect in both UVA and UVB regions, and having a small content. It was found that even when used, it can provide an efficient UV blocking effect.

(3) Experimental Example 3: Formulation stability evaluation

The formulation stability of compositions prepared according to different manufacturing processes was evaluated.

The experimental method is as follows. The compositions of titanium dioxide and zinc oxide of Example 1 and Comparative Examples 1 and 2 were maintained, and each composition was prepared using the production methods of Preparation Examples 1 to 3 shown in Table 5 below.

Specifically, the method of Preparation Example 1 is the same as the preparation method of Examples 1 to 3. In the method of Preparation Example 2, the emulsification process is performed at a temperature of 70°C instead of 40°C in the method of Preparation Example 1, and in the method of Preparation Example 3, except for the process of adding a flow regulator in the method of Preparation Example 1, After adding titanium dioxide, the manufacturing process is performed by adding polyglyceryl-3 distearate and glyceryl stearate citrate as emulsifiers.

For the compositions prepared in Preparation Examples 1 to 3, it was visually determined whether the formulation was stably formed without precipitation or phase separation, and the results are shown in Table 6.

As a result of the experiment, in the case of Preparation Example 1 in which the emulsification process was performed at a low temperature of 40°C, it was found that the composition prepared by maintaining the composition of titanium dioxide and zinc oxide as in Example 1 was formed and maintained as a stable formulation.

On the other hand, the compositions prepared by maintaining the composition of titanium dioxide and zinc oxide as Comparative Example 1 (excluding zinc oxide) and Comparative Example 2 (excluding titanium dioxide) showed poor formulation stability, such as precipitation or phase separation of the formulation. Could know.

That is, it was found that the composition according to the present invention was formed stably and had excellent formulation stability at low, room, and high temperatures by using a mixture of titanium dioxide and zinc oxide as a sunscreen.

In addition, in the case of Preparation Example 2 in which the emulsification process was performed at a high temperature of 70°C, phase separation occurred in all compositions and the formulation could not be formed stably, and in Preparation Example 3 in which an emulsifier was added instead of the flow regulator, It was found that in all compositions, the emulsifier did not dissolve and the formulation could not be formed stably.

That is, it was found that the composition according to the present invention is simple and hassle-free in its manufacturing process as the emulsification process is performed at a low temperature of 40°C, and its formulation stability is also very excellent. In addition, it was found that the present invention substantially does not contain an emulsifier, so the substances in the composition are dissolved evenly and the formulation stability is excellent.

As the specific parts of the present invention have been described in detail above, it is clear to those skilled in the art that these specific techniques are merely preferred embodiments and do not limit the scope of the present invention. It will be obvious. Accordingly, the actual scope of the present invention will be defined by the appended claims and their equivalents.

Claims (13)

An oil-in-water cosmetic composition for blocking ultraviolet rays,
Contains sunscreen and flow regulator,
The sunscreen contains inorganic powder,
The inorganic powder includes titanium dioxide and zinc oxide,
The titanium dioxide is contained in the outer phase of the cosmetic composition, and the zinc oxide is contained in the inner phase of the cosmetic composition,
A cosmetic composition, characterized in that the weight ratio of the zinc oxide to the titanium dioxide is 1:0.5 to 3. According to claim 1,
A cosmetic composition, characterized in that the inorganic powder is contained in an amount of 10 to 30% by weight based on the total weight of the composition. delete According to claim 1,
A cosmetic composition, characterized in that the titanium dioxide is contained in an amount of 1 to 20% by weight based on the total weight of the composition. According to claim 1,
A cosmetic composition, characterized in that the zinc oxide is contained in an amount of 1 to 30% by weight based on the total weight of the composition. delete According to claim 1,
A cosmetic composition, wherein the flow regulator includes Hydroxypropyl Methylcellulose Stearoxy Ether. According to claim 1,
A cosmetic composition, characterized in that the flow regulator is included in an amount of 0.01 to 10% by weight based on the total weight of the composition. According to claim 1,
A cosmetic composition, characterized in that the cosmetic composition is emulsified at a temperature of 30 to 60 ° C. According to claim 1,
A cosmetic composition, characterized in that the cosmetic composition does not contain an emulsifier. A method for producing an oil-in-water UV blocking cosmetic composition,
dispersing the aqueous phase;
Dispersing the oil phase;
Primary mixing titanium dioxide and a flow regulator in the water phase; and
It includes the step of secondarily mixing the oil phase and zinc oxide with the first mixed mixture,
The weight ratio of the zinc oxide to the titanium dioxide is 1:0.5 to 3, method. According to claim 11,
The method, characterized in that the first mixing step and the second mixing step are performed at a temperature of 30 to 60 ° C. delete