Solid temporal colorimetric hydrogel cosmetic composition having flexibility by gamma-ray irradiation

Abstract

A solid temporal colorimetric hydrogel cosmetic composition includes 15 to 99.90 wt % of the water phase part and 0.10 to 85 wt % of the oil phase part, having a refractive index difference of 0 to 0.02 therebetween, and having a color change according to variations in a refractive index difference between the water phase part and the oil phase difference when applied to the skin. The cosmetic composition not only has flexibility through irradiation of gamma-rays, but also enables an optimal application time of the cosmetic composition to be visually confirmed through a color change from transparency to ivory white due to a change in the refractive index difference caused by absorbency and volatilization of water when applying the composition to the skin. The cosmetic composition is capable of improving quality of a product although a preservative irritating to the skin is not added.

Claims

1. A solid temporal colorimetric hydrogel cosmetic composition having flexibility by irradiation of gamma-rays which is an oil-in-water type hydrogel cosmetic composition comprising a water phase part and an oil phase part, wherein the cosmetic composition comprises 15 to 99.90 wt % of the water phase part and 0.10 to 85 wt % of the oil phase part based on the total weight percentage of the composition, wherein the water phase part comprises a polymer, a refractive index regulator, and purified water, and the water phase part comprises 3.0 to 30 wt % of the polymer and 3 to 60 wt % of the refractive index regulator based on the total weight percentage of the water phase part, wherein the water phase part and the oil phase part have a refractive index difference of 0 to 0.02 therebetween, the cosmetic composition has 5 to 50 kGy gamma-rays irradiated thereto, resulting in solid gel formation and having flexibility, and the cosmetic composition further comprises a color change according to variations in a refractive index difference between the water phase part and the oil phase part by absorption of moisture and volatiles when applying the cosmetic composition to the skin.

2. The solid temporal colorimetric hydrogel cosmetic composition of claim 1, wherein the polymer is a zwitterionic polymer, a cationic polymer, an anionic polymer, or a nonionic polymer.

3. The solid temporal colorimetric hydrogel cosmetic composition of claim 1, wherein the polymer is at least one member selected from the group of hyaluronic acid, hyaluronic acid salts, carrageenan, polyvinyl alcohol, and polyvinyl pyrrolidone.

4. The solid temporal colorimetric hydrogel cosmetic composition of claim 1, wherein the refractive index regulator is at least one member selected from the group of polyhydric alcohols, saccharide, polyoxyalkylene, polyoxyalkylene copolymer, polyoxyalkylene-containing alcohols, and silicone/polyalkylene copolymer.

5. The solid temporal colorimetric hydrogel cosmetic composition of claim 1, wherein the water phase part and the oil phase part include a surfactant.

6. The solid temporal colorimetric hydrogel cosmetic composition of claim 5, wherein the cosmetic composition comprises 0.05 to 30 wt % of the surfactant based on the total weight percentage of the composition.

7. The solid temporal colorimetric hydrogel cosmetic composition of claim 5, wherein the surfactant is an anionic surfactant, a cationic surfactant, a nonionic surfactant, or an amphoteric surfactant.

8. The solid temporal colorimetric hydrogel cosmetic composition of claim 1, wherein the oil phase part includes a refractive index regulator and oil.

9. The solid temporal colorimetric hydrogel cosmetic composition of claim 8, wherein the oil is at least one member selected from the group including a silicon-based oil, a hydrocarbon oil, an ester-based oil, a natural oil, a higher alcohol, and a fatty acid.

10. The solid temporal colorimetric hydrogel cosmetic composition of claim 8, wherein the refractive index regulator of the oil phase part is any one of ingredients composing the oil phase part by including oil.

11. A method of preparing a solid temporal colorimetric hydrogel cosmetic composition having flexibility by irradiation of gamma-rays, as a method of preparing an oil-in-water type hydrogel cosmetic composition comprising a water phase part and an oil phase part, the method comprising the steps of: a step (S1) of mixing and dissolving respective ingredients of the water phase part; a step (S2) of mixing and dissolving respective ingredients of the oil phase part; a step (S3) of forming an emulsion by emulsifying a mixed and dissolved water phase part into a mixed and dissolved oil phase part; a step (S4) of irradiating the gamma-rays to the emulsion; and a step (S5) of confirming whether a solid gel having fluidity is formed or not, wherein the cosmetic composition comprises 15 to 99.90 wt % of the water phase part and 0.10 to 85 wt % of the oil phase part based on the total weight percentage of the composition, wherein the water phase part comprises a polymer, a refractive index regulator, and purified water, and the water phase part comprises 3.0 to 30 wt % of the polymer and 3 to 60 wt % of the refractive index regulator based on the total weight percentage of the water phase part, wherein the water phase part and the oil phase part have a refractive index difference of 0 to 0.02 therebetween, the cosmetic composition has 5 to 50 kGy gamma-rays irradiated thereto, resulting in solid gel formation and having flexibility, and the cosmetic composition comprises a color change according to variations in a refractive index difference between the water phase part and the oil phase part by absorption of moisture and volatiles when applying the cosmetic composition to the skin.

12. The method of claim 11, wherein the step (S1) comprises mixing and dissolving respective ingredients of the water phase part at 60 to 85° C. and 4,000 rpm for 50 to 70 minutes.

13. The method of claim 11, wherein the step (S3) comprises injecting the mixed and dissolved oil phase part into the mixed and dissolved water phase part, and performing an emulsification process at 60 to 85° C. and 4,000 rpm for 8 to 20 minutes to form am emulsion.

14. A solid temporal colorimetric hydrogel cosmetic composition having flexibility by irradiation of gamma-rays which is an oil-in-water type hydrogel cosmetic composition comprising a water phase part and an oil phase part, wherein the cosmetic composition comprises 15 to 99.90 wt % of the water phase part and 0.10 to 85 wt % of the oil phase part based on the total weight percentage of the composition, wherein the water phase part comprises a polymer, a refractive index regulator, and purified water, and the water phase part comprises 3.0 to 30 wt % of the polymer and 3 to 60 wt % of the refractive index regulator based on the total weight percentage of the water phase part, wherein the oil phase part comprises a refractive index regulator and oil, wherein the water phase part and the oil phase part have a refractive index difference of 0 to 0.02 therebetween, the cosmetic composition has 5 to 50 kGy gamma-rays irradiated thereto, resulting in solid gel formation and having flexibility, and the cosmetic composition further comprises a color change according to variations in a refractive index difference between the water phase part and the oil phase part by absorption of moisture and volatiles when applying the cosmetic composition to a skin.

Description

DETAILED DESCRIPTION OF THE INVENTION

(1) Hereinafter, the present invention will be described in more detail with reference to the following Examples and Comparative Examples. However, the following Examples and Comparative Examples are provided for illustrative purposes only, and the scope of the present invention should not be limited thereto in any manner. Further, the description about usual measurement experiments in a test process of measuring efficacy has been omitted.

<Example 1> Confirming Oil-in-Water Type Emulsions According to Weight Percentages of Water Phase Parts and Oil Phase Parts

(2) According to compositions of Table 1, properties and states of the emulsions were confirmed after weighing fixed quantities of respective ingredients of the water phase parts, mixing and dissolving the weighed fixed quantities of the respective ingredients of the water phase parts using Agi mixer at 80° C. and 4,000 rpm for 60 minutes, slowly injecting separate dissolved oil phase parts into the mixed and dissolved water phase parts, and performing emulsification processes using Homo mixer at 80° C. and 4,000 rpm for 10 minutes to form emulsions.

(3) TABLE-US-00001 TABLE 1 Content (wt %) Example Example Example Example Example Ingredients 1-1 1-2 1-3 1-4 1-5 Water Polyvinyl alcohol  10.00  6.00  4.00  2.00  0.50 phase Hyaluronic acid  1.50  1.00  0.80  0.50  0.20 part Carrageenan  1.50  1.00  0.80  0.50  0.20 Polyethylene  0.05  2.00  3.00  4.00  5.00 glycol (20) sorbitan stearate Glycerin  10.00  8.00  5.00  3.00  0.50 Purified water  76.85  62.00  36.40  20.00  8.60 Oil Sorbitan stearate  0.01  1.00  2.00  2.50  3.00 phase Dimethicone   0.045  9.50  24.00  33.75  41.00 part Hexyl laurate   0.045  9.50  24.00  33.75  41.00 Total 100.00 100.00 100.00 100.00 100.00

(4) As represented in the foregoing Table 1, it is shown that oil phase parts of Example 1 according to the present invention have weight percentages of 0.1 to 85 wt % and can be all confirmed to form ivory white emulsions.

<Example 2> Confirming Whether or not to Form Oil-in-Water Type Emulsions According to Weight Percentages of Surfactants

(5) According to compositions of Table 2, properties and states of the emulsions were confirmed after weighing fixed quantities of respective ingredients of the water phase parts, mixing and dissolving the weighed fixed quantities of the respective ingredients of the water phase parts using Homo mixer at 80° C. and 4,000 rpm for 60 minutes, slowly injecting separate dissolved oil phase parts into the mixed and dissolved water phase parts, and performing emulsification processes using Homo mixer at 80° C. and 4,000 rpm for 10 minutes to form emulsions.

(6) TABLE-US-00002 TABLE 2 Content (wt %) Example Example Example Ingredients 2-1 2-2 2-3 Water Polyvinyl alcohol 10.00 4.00 4.00 phase Hyaluronic acid 1.50 0.80 0.80 part Carrageenan 1.50 0.80 0.80 Polyethylene glycol (20) 0.04 10.00 20.00 sorbitan stearate Glycerin 10.00 5.00 5.00 Purified water 76.85 23.40 44.40 Oil phase Sorbitan stearate 0.01 5.00 10.00 part Dimethicone 0.05 25.50 7.50 Hexyl laurate 0.05 25.50 7.50 Total 100.00 100.00 100.00

(7) As represented in the foregoing Table 2, it is shown that polyethylene glycol (20) sorbitan stearate and sorbitan stearate used as surfactants of Example 2 according to the present invention have weight percentages of 0.05 to 30 wt %, and can be all confirmed to form emulsions.

<Example 3> Confirming Whether or not to Form a Gel According to Irradiation Amounts of Gamma-Rays

(8) According to compositions of Table 3, it was confirmed whether a solid gel having fluidity was formed or not by containing the emulsion in a separate container and irradiating the gamma-rays to the emulsion with irradiation dose differences of 5 kGy, 15 kGy, 35 kGy and 50 kGy after weighing fixed quantities of respective ingredients of the water phase part, mixing and dissolving the weighed fixed quantities of the respective ingredients of the water phase part using Homo mixer at 80° C. and 4,000 rpm for 60 minutes, slowly injecting a separate dissolved oil phase part into the mixed and dissolved water phase part, and performing an emulsification process using Homo mixer at 80° C. and 4,000 rpm for 10 minutes to form an emulsion.

(9) TABLE-US-00003 TABLE 3 Ingredients Content (wt %) Water Polyvinyl alcohol 6.00 phase Hyaluronic acid 1.00 part Carrageenan 1.00 Polyethylene glycol 3.00 (20) sorbitan stearate Glycerin 8.00 Purified water 61.00 Oil Sorbitan stearate 1.00 phase Dimethicone 9.50 part Hexyl laurate 9.50 Total 100.0

(10) TABLE-US-00004 TABLE 4 Irradiation dose Strength (kgf/cm.sup.2) Hardness (g/cm.sup.2)  5 kGy 230.62  7,760.96 15 kGy 370.75 10,107.36 35 kGy 440.28 14,078.00 50 kGy 511.12 18,647.40

(11) As represented in confirmation of strength and hardness values of the gel according to irradiation amounts of gamma-rays of the foregoing Table 4, all solid gel forms having flexibility could be confirmed from the gel of Example 3 according to the present invention at a gamma-ray irradiation amount of 5 to 50 kGy, and it is shown that the more the irradiation amount is increased, the more strength and hardness values of the gel are increased.

<Example 4> Confirming Whether Gamma-Ray Irradiated Gels are Formed or not According to Weight Percentages of Polymers

(12) According to compositions of Table 5, it was confirmed whether solid gels having flexibility were formed or not by containing the emulsions in separate containers and irradiating the gamma-rays to the emulsions at an irradiation amount of 25 kGy/hr after weighing fixed quantities of respective ingredients of the water phase parts, mixing and dissolving the weighed fixed quantities of the respective ingredients of the water phase parts using Homo mixer at 80° C. and 4,000 rpm for 60 minutes, slowly injecting separate dissolved oil phase parts into the mixed and dissolved water phase parts, and performing emulsification processes using Homo mixer at 80° C. and 4,000 rpm for 10 minutes to form emulsions.

(13) TABLE-US-00005 TABLE 5 Content (wt %) Example Example Example Ingredients 4-1 4-2 4-3 Water Polyvinyl alcohol 1.00 2.50 4.00 phase Hyaluronic acid 0.25 0.50 1.00 part Carrageenan 0.25 0.50 1.00 Polyethylene glycol 4.00 4.00 4.00 (20) sorbitan stearate Glycerin 3.00 2.00 1.00 Purified water 21.50 20.5 19.00 Oil phase Sorbitan stearate 2.50 2.50 2.50 part Dimethicone 33.75 33.75 33.75 Hexyl laurate 33.75 33.75 33.75 Total 100.00 100.00 100.00

(14) As represented in the foregoing Table 5, solid gel forms which all have flexibility at a gamma-ray irradiation amount of 25 kGy when polyvinyl alcohol, hyaluronic acid and carrageenan used as polymers of Example 4 according to the present invention were contained in the water phase parts in amounts of 5 to 20 wt % based on the total weight percentages of the water phase parts could be confirmed.

<Example 5> Confirming Transparency Values According to Refractive Index Differences Between the Water Phase Parts and the Oil Phase Parts

(15) According to compositions of Table 6, transparency values of solid gels having flexibility were confirmed by containing the emulsions in separate containers, and irradiating the gamma-rays to the emulsions at an irradiation amount of 25 kGy/hr after weighing fixed quantities of respective ingredients of the water phase parts, mixing and dissolving the weighed fixed quantities of the respective ingredients of the water phase parts using Homo mixer at 80° C. and 4,000 rpm for 60 minutes, slowly injecting separate dissolved oil phase parts into the mixed and dissolved water phase parts, and performing emulsification processes using Homo mixer at 80° C. and 4,000 rpm for 10 minutes to form emulsions.

(16) TABLE-US-00006 TABLE 6 Content (wt %) Ingredients Example 5-1 Example 5-2 Water Polyvinyl alcohol 6.00 6.00 phase Hyaluronic acid 1.00 1.00 part Carrageenan 1.00 1.00 Polyethylene glycol 2.50 2.50 (20) sorbitan stearate Glycerin 37.20 24.80 Purified water 32.30 44.70 Oil Sorbitan stearate 1.00 1.00 phase Dimethicone 19.00 19.00 part Hexyl laurate 0.00 0.00 Octocrylene 0.00 0.00 Total 100.00 100.00

(17) TABLE-US-00007 TABLE 7 Refractive index (25° C.) Items Example 5-1 Example 5-2 Water phase part 1.4043 1.3843 Oil phase part 1.4043 1.4043 Refractive index difference 0.0000 0.0200 Transparency 1 2 <1: Transparent, 2: Slightly opaque, 3: Opaque>

(18) As shown in refractive indexes of the water phase parts and the oil phase parts of the foregoing Table 7, color changes from transparency to ivory white can be confirmed at refractive index differences of not more than 0.02 between the water phase parts and the oil phase parts of Example 5 according to the present invention.

<Example 6> Confirming Color Changes from Transparency to Ivory White According to Refractive Index Differences Between the Water Phase Parts and the Oil Phase Parts

(19) After cutting gels prepared according to compositions of Table 6 to a thickness of 2 mm, extents to which colors had been changed from transparency to ivory white were observed with the naked eye by attaching the cut gels to skins of 15 healthy adult men and women. After calculating average values of respective evaluation results, the calculated average values of the respective evaluation results are shown in the following Table 8.

(20) TABLE-US-00008 TABLE 8 Extents of color change 5 30 60 90 120 Items minutes minutes minutes minutes minutes Example 5-1 ** *** **** **** **** Example 5-2 — ** ** *** *** <—: No change, *: Slight change, **: Fair, ***: Good, ****: Very good>

(21) As represented in the foregoing Table 8, a color change from transparency to ivory white in case of Example 5-1 could be confirmed, and a color change in case of Example 5-2 could be confirmed although a variation range was not high starting from slightly opaque ivory white in the initial stage as results of confirming extents of color changes due to refractive index differences between the oil phase parts and the water phase parts when applying the oil phase parts and the water phase parts of Example 6 according to the present invention to the skin.

<Comparative Example 1> Confirming Oil-in-Water Type Emulsions According to Weight Percentages of Water Phase Parts and Oil Phase Parts

(22) According to compositions of Table 9, properties and states of the emulsions were confirmed after weighing fixed quantities of respective ingredients of the water phase parts, mixing and dissolving the weighed fixed quantities of the respective ingredients of the water phase parts using Agi mixer at 80° C. and 4,000 rpm for 60 minutes, slowly injecting separate dissolved oil phase parts into the mixed and dissolved water phase parts, and performing emulsification processes using Homo mixer at 80° C. and 4,000 rpm for 10 minutes to form emulsions.

(23) TABLE-US-00009 TABLE 9 Content (wt %) Com- Com- Com- Com- parative parative parative parative Example Example Example Example Ingredients 1-1 1-2 1-3 1-4 Water Polyvinyl alcohol 10.00 10.00 2.00 1.00 phase Hyaluronic acid 1.50 1.50 0.50 0.20 part Carrageenan 1.50 1.50 0.50 0.20 Polyethylene glycol 0.05 0.05 3.00 3.00 (20) sorbitan stearate Glycerin 10.00 10.00 1.00 1.00 Purified water 76.92 76.90 5.00 2.60 Oil Sorbitan stearate 0.01 0.01 2.00 2.00 phase Dimethicone 0.01 0.02 43.00 45.00 part Hexyl laurate 0.01 0.02 43.00 45.00 Total 100.00 100.00 100.00 100.00

(24) As represented in the foregoing Table 9, it is difficult to form ivory white emulsions when the oil phase part of Comparative Example 1 according to the present invention has a weight percentage of less than 0.10, and a water-in-oil type emulsion is not formed when the oil phase part of Comparative Example 1 according to the present invention has a weight percentage of 85 or more.

<Comparative Example 2> Confirming Whether or not to Form Oil-in-Water Type Emulsions According to Weight Percentages of Surfactants

(25) According to compositions of Table 10, properties and states of the emulsions were confirmed after weighing fixed quantities of respective ingredients of the water phase parts, mixing and dissolving the weighed fixed quantities of the respective ingredients of the water phase parts using Homo mixer at 80° C. and 4,000 rpm for 60 minutes, slowly injecting separate dissolved oil phase parts into the mixed and dissolved water phase parts, and performing emulsification processes using Homo mixer at 80° C. and 4,000 rpm for 10 minutes to form emulsions.

(26) TABLE-US-00010 TABLE 10 Content (wt %) Comparative Comparative Ingredients Example 2-1 Example 2-2 Water Polyvinyl alcohol 10.00 4.00 phase Hyaluronic acid 1.50 0.80 part Carrageenan 1.50 0.80 Polyethylene glycol 0.03 23.00 (20) sorbitan stearate Glycerin 10.00 5.00 Purified water 76.86 41.40 Oil Sorbitan stearate 0.01 12.00 phase Dimethicone 0.045 6.50 part Hexyl laurate 0.045 6.50 Total 100.00 100.00

(27) As represented in the foregoing Table 10, polyethylene glycol (20) sorbitan stearate and sorbitan stearate used as surfactants of Example 2 according to the present invention are not suitable for the present invention since a phenomenon that oil floats on emulsions when polyethylene glycol (20) sorbitan stearate and sorbitan stearate are contained in a weight percentage of 0.05 or less, and translucent emulsions are formed when polyethylene glycol (20) sorbitan stearate and sorbitan stearate are contained in a weight percentage of 30 or more.

<Comparative Example 3> Confirming Whether or not to Form a Gel According to Irradiation Amounts of Gamma-Rays

(28) According to compositions of Table 3, it was confirmed whether a solid gel having fluidity was formed or not by containing the emulsion in a separate container and irradiating the gamma-rays to the emulsion in different irradiation doses after weighing fixed quantities of respective ingredients of the water phase part, mixing and dissolving the weighed fixed quantities of the respective ingredients of the water phase part using Homo mixer at 80° C. and 4,000 rpm for 60 minutes, slowly injecting a separate dissolved oil phase part into the mixed and dissolved water phase part, and performing an emulsification process using Homo mixer at 80° C. and 4,000 rpm for 10 minutes to form an emulsion.

(29) TABLE-US-00011 TABLE 11 Irradiation dose Strength (kgf/cm.sup.2) Hardness (g/cm.sup.2)  2 kGy 80.67 2,711.40 80 kGy 887.78 31,471.61

(30) As represented in confirmation of strength and hardness values of the gel according to irradiation amounts of gamma-rays of the foregoing Table 11, it is difficult to see the gel as a solid form of the present research since the gel of Example 3 according to the present invention has a very low strength at a gamma-ray irradiation amount of 2 kGy, and the gel of Example 3 according to the present invention does not have flexibility of the present research since a phenomenon that the gel having all solid forms is easily broken without having flexibility is confirmed at a gamma-ray irradiation amount of 80 kGy.

<Comparative Example 4> Confirming Whether Gamma-Ray Irradiated Gels are Formed or not According to Weight Percentages of Polymers

(31) According to compositions of Table 12, it was confirmed whether solid gels having flexibility were formed or not by containing the emulsions in separate containers and irradiating the gamma-rays to the emulsions at an irradiation amount of 25 kGy/hr after weighing fixed quantities of respective ingredients of the water phase parts, mixing and dissolving the weighed fixed quantities of the respective ingredients of the water phase parts using Homo mixer at 80° C. and 4,000 rpm for 60 minutes, slowly injecting separate dissolved oil phase parts into the mixed and dissolved water phase parts, and performing emulsification processes using Homo mixer at 80° C. and 4,000 rpm for 10 minutes to form emulsions.

(32) TABLE-US-00012 TABLE 12 Content (wt %) Comparative Comparative Ingredients Example 4-1 Example 4-2 Water Polyvinyl alcohol 0.40 5.00 phase Hyaluronic acid 0.25 1.00 part Carrageenan 0.25 1.50 Polyethylene glycol 4.00 4.00 (20) sorbitan stearate Glycerin 3.00 1.00 Purified water 22.10 17.50 Oil Sorbitan stearate 2.50 2.50 phase Dimethicone 33.75 33.75 part Hexyl laurate 33.75 33.75 Total 100.00 100.00

(33) As represented in the foregoing Table 12, it is difficult to see the solid gels as a solid gel of the present invention since the solid gels are formed in such a form that is extended at a gamma-ray irradiation amount of 25 kGy when polyvinyl alcohol, hyaluronic acid and carrageenan used as polymers of Comparative Example 4 according to the present invention were contained in the water phase parts in amounts of 3 wt % based on the total weight percentages of the water phase parts, and it is difficult for the solid gels to have flexibility since flowability is dropped due to a high viscosity, and strength values of the gels are too high at the gamma-ray irradiation amount of 25 kGy when the polymers were contained in the water phase parts in amounts of 25 wt % based on the total weight percentages of the water phase parts.

<Comparative Example 5> Confirming Transparency Values According to Refractive Index Differences Between the Water Phase Parts and the Oil Phase Parts

(34) According to compositions of Table 13, transparency values of solid gels having flexibility were confirmed by containing the emulsions in separate containers, and irradiating the gamma-rays to the emulsions at an irradiation amount of 25 kGy/hr after weighing fixed quantities of respective ingredients of the water phase parts, mixing and dissolving the weighed fixed quantities of the respective ingredients of the water phase parts using Homo mixer at 80° C. and 4,000 rpm for 60 minutes, slowly injecting separate dissolved oil phase parts into the mixed and dissolved water phase parts, and performing emulsification processes using Homo mixer at 80° C. and 4,000 rpm for 10 minutes to form emulsions.

(35) TABLE-US-00013 TABLE 13 Content (wt %) Com- Com- Com- parative parative parative Example Example Example Ingredients 5-1 5-2 5-3 Water Polyvinyl alcohol 6.00 6.00 6.00 phase Hyaluronic acid 1.00 1.00 1.00 part Carrageenan 1.00 1.00 1.00 Polyethylene glycol 2.50 2.50 2.50 (20) sorbitan stearate Glycerin 0.00 0.00 0.00 Purified water 69.5 69.5 69.5 Oil Sorbitan stearate 1.00 1.00 1.00 phase Dimethicone 16.86 9.07 0.00 part Hexyl laurate 2.14 9.93 2.69 Octocrylene 0.00 0.00 16.31 Total 100.00 100.00 100.00

(36) TABLE-US-00014 TABLE 14 Refractive index (25° C.) Com- Com- Com- parative parative parative Example Example Example Items 5-1 5-2 5-3 Water phase part 1.3425 1.3425 1.3425 Oil phase part 1.4125 1.4425 1.5425 Refractive index difference 0.0700 0.1000 0.2000 Transparency 3 3 3 <1: Transparent, 2: Slightly opaque, 3: Opaque>

(37) As shown in refractive indexes of the water phase parts and the oil phase parts of the foregoing Table 14, color changes from transparency to ivory white cannot be confirmed since opacity can be confirmed at refractive index differences of 0.07 or more between the oil phase parts and the water phase parts of Comparative Example 5 according to the present invention.

<Comparative Example 6> Confirming Color Changes from Transparency to Ivory White According to Refractive Index Differences Between the Water Phase Parts and the Oil Phase Parts

(38) After cutting gels prepared according to compositions of Table 13 to a thickness of 2 mm, extents to which colors had been changed from transparency to ivory white were observed with the naked eye by attaching the cut gels to skins of 15 healthy adult men and women. After calculating average values of respective evaluation results, the calculated average values of the respective evaluation results are shown in the following Table 15.

(39) TABLE-US-00015 TABLE 15 Extents of color change 5 30 60 90 120 min- min- min- min- min- Items utes utes utes utes utes Comparative Example 5-1 — — — — — Comparative Example 5-2 — — — — — Comparative Example 5-3 — — — — — <—: No change, *: Slight change, **: Fair, ***: Good, ****: Very good>

(40) As represented in the foregoing Table 15, color changes from transparency to ivory white have not been occurred autonomously in Comparative Examples 5-1, 5-2 and 5-3 as results of confirming extents of color changes due to refractive index differences between the oil phase parts and the water phase parts when applying the oil phase parts and the water phase parts of Comparative Example 6 according to the present invention to the skin.

(41) The above-disclosed subject matter is to be considered illustrative, and not restrictive, and the appended claims are intended to cover all such modifications, enhancements, and other embodiments, which fall within the true spirit and scope of the present invention. Thus, to the maximum extent allowed by law, the scope of the present invention is to be determined by the broadest permissible interpretation of the following claims and their equivalents, and shall not be restricted or limited by the foregoing detailed description.