PIEZOELECTRIC COSMETIC COMPOSITION

Abstract

The present disclosure relates to a cosmetic composition having piezoelectricity. More particularly, the present disclosure relates to a piezoelectric cosmetic composition which includes a piezoelectric material capable of generating microcurrent upon the application of pressure as an active ingredient.

According to the present disclosure, when the piezoelectric composition is applied to and massaged on the skin, it is possible to maximize an effect of skin care, including an effect of improving skin elasticity, by generating microcurrent.

Claims

1. A piezoelectric cosmetic composition applied to the skin, which comprises a piezoelectric material capable of generating microcurrent upon the application of pressure as an active ingredient.

2. The piezoelectric cosmetic composition according to claim 1, wherein the piezoelectric material has a piezoelectric constant of 1-20 pC/N as determined by using a liquid phase piezoelectricity measuring device.

3. The piezoelectric cosmetic composition according to claim 1, wherein the piezoelectric material is a liquid crystal emulsion itself, inorganic pigment powder, piezoelectric element or a piezoelectric polymer.

4. The piezoelectric cosmetic composition according to claim 1, wherein the microcurrent generated by the piezoelectric material not only helps infiltration of a cosmetic agent into the skin but also improves skin elasticity through skin stimulation.

5. The piezoelectric cosmetic composition according to claim 1, which further comprises at least one cosmetic agent selected from the group consisting of water, oil, polyol, surfactant and a moisturizing agent.

6. The piezoelectric cosmetic composition according to claim 1, which has a formulation selected from an emollient, skin softener, lotion, cream and essence.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG. 1 is a schematic view illustrating an apparatus for determining the piezoelectricity of a cosmetic agent. A liquid specimen is introduced to a sealed container and quantity of charge is measured between electrodes positioned at both sides of the specimen while applying a vertical load thereto.

[0021] FIG. 2 is a graph illustrating the piezoelectricity of the cosmetic compositions according to Comparative Examples 1 and 2 and Examples 1-3.

DETAILED DESCRIPTION

[0022] Exemplary embodiments now will be described more fully hereinafter. The present disclosure may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth therein.

[0023] Test Example 1: Preparation of Comparative Examples and Examples

[0024] To carry out comparison of the effect of a cosmetic composition in the presence or absence of a piezoelectric material as an active ingredient according to the present disclosure, emulsion was prepared with the composition as shown in the following Table 1.

[0025] Each of Comparative Examples 1 and 2 is a conventional (W/O) emulsion, Example 1 is a liquid crystal emulsion, Example 2 is a conventional emulsion containing zinc oxide as a piezoelectric material, and Example 3 is a conventional emulsion containing titanium dioxide as a piezoelectric material.

TABLE-US-00001 TABLE 1 Comparative Comparative Ingredients Example 1 Example 2 Example 1 Example 2 Example 3 1. polydecene 0.009 2. Squalane 0.0005 3. Cetearyl alcohol 4 4. C14-22 alcohol 1.6 5. Vitamin E acetate 0.2 0.2 0.2 6. Glyceryl stearate SE 0.5 7. Caprylic/capric triglyceride 3 10 3 3 8. PEG/PPG-19/19 dimethicone 1.5 0.1 1.5 1.5 9. Dimethicone 3 10. Cyclomethicone 3 11. Cetyl dimethicone 3 12. Dimethicone/vinyl dimethicone 3 crosspolymer 13. cyclopentasiloxane 21.5 21.5 21.5 14. C12-20 alkyl glucoside 0.4 15. Hydrogenated lecithin 0.1 16. D.I. Water To 100 To 100 To 100 To 100 To 100 17. 1% EDTA-2Na solution 2 2 2 2 2 18. Sodium PCA 0.5 19. Sodium glutamate 0.5 0.5 0.5 20. Dipropylene glycol 10 10 10 21. Butylene glycol 2 22. Glycerin 5 10 15 10 10 23. 1% Carbomer solution 12 24. Triethanolamine 0.1 25. presevatives suitable suitable suitable suitable suitable amount amount amount amount amount 26. Perfume 0.1 0.1 0.1 0.1 0.1 27. piezoelectric material 4 (zinc oxide) 28. piezoelectric material 4 (titanium dioxide)

[0026] 1) In Table 1, Ingredients 1-15 are oil-soluble ingredients, wherein Ingredients 3 and 4 are higher aliphatic alcohols, Ingredients 14 and 15 are non-polyethylene oxide (POE) based nonionic surfactants, and Ingredients 16-24 are water-soluble ingredients, wherein Ingredients 20-22 are polyols, Ingredients 23 and 24 are viscosity modifiers, Ingredient 25 is a preservative, Ingredient 26 is a fragrance ingredient, and Ingredients 27 and 28 are piezoelectric materials.

[0027] 2) In Table 1, Ingredients 1-15 were mixed and dissolved at 70-80 C. to form an oil phase solution.

[0028] 3) In a separate container, Ingredients 16-22 described in Table 1 were mixed and warmed/dissolved to a temperature of 70-80 C. to form an aqueous phase solution.

[0029] 4)-1. The oil phase solution of 2) was added gradually to the aqueous phase solution and agitated with a homomixer (Example 1).

[0030] 4)-2. The aqueous phase solution of 3) was added gradually to the oil phase solution of 2) and agitated with a homomixer (Comparative Examples 1 and 2, and Examples 2 and 3).

[0031] 5) Ingredient 23 in Table 1 was mixed with the resultant mixed solution of 4), and then Ingredient 23 was added thereto.

[0032] 6) Example 1 was quenched to 40 C. within 10 minutes after the completion of the process of 5). Then, Ingredients 25 and 26 in Table 1 were introduced, followed by degassing.

[0033] 7) In the case of Comparative Examples 1 and 2, the mixture was allowed to stand at room temperature after the completion of the process of 5), and Ingredients 25 and 26 in Table 1 were introduced, followed by degassing.

[0034] 8) In the case of Examples 2 and 3, the mixture was allowed to stand at room temperature after the completion of the process of 5), Ingredients 25 and 26 in Table 1 were introduced, and each of the piezoelectric materials 27 and 28 was dispersed, followed by degassing.

[0035] The liquid crystal emulsion according to Example 1 were obtained by mixing non-POE based nonionic lecithin with a glucoside-based surfactant. It is a liquid crystal emulsion having a stable multilayer lamella structure containing intercellular lipid after the quenching process. After the liquid crystal emulsion was observed with a polarizing microscope, it was shown that a liquid crystal phase was formed.

[0036] Test Example 2: Piezoelectricity Test for Piezoelectric Cosmetic Compositions

[0037] Examples 1-3 and Comparative Example 1 and 2 obtained according to Test Example 1 were determined for piezoelectricity by using a liquid phase piezoelectricity measuring apparatus. The results are shown in the following Table 2.

[0038] <Method>

[0039] 1) First, 55 L of each sample was inserted between electrodes and a motor stage was moved to apply a load of 4-10N repeatedly.

[0040] 2) Quantity of charge generated from the applied load and sample was measured.

TABLE-US-00002 TABLE 2 Comparative Comparative Exam- Exam- Exam- Test Example 1 Example 2 ple 1 ple 2 ple 3 piezoelectric 11.9 12.8 3.1 constant (pC/N)

[0041] As shown in Table 2, Comparative Examples 1 and 2 (conventional W/O emulsion) showed no piezoelectricity, while Example 1 (liquid crystal emulsion) had a piezoelectric constant value of 11.9 corresponding to a level of a polymer piezoelectric element. Examples 2 and 3 (piezoelectric material-containing emulsion) had a piezoelectric constant of 12.8 and 3.1, respectively. Therefore, the highest piezoelectricity was observed from the emulsion containing zinc oxide.

[0042] Test Example 3: Skin Safety Test for Piezoelectric Cosmetic Compositions

[0043] Ten male and female adult subjects suffering from no skin diseases were allowed to use Examples 1-3 and Comparative Examples 1 and 2, and to evaluate a degree of skin irritation as described hereinafter. First, 20 L of a specimen was applied to the forearm of each subject, and the test site was sealed and covered with a patch for 24 hours. Then, 30 minutes and 24 hours after removing the patch, the skin response was examined according to the terminology defined in the guideline of CTFA (Cosmetic, Toiletry and Fragrance Association). The results were obtained by averaging the points judged by the subjects and evaluated as follows: 0 (no irritation), less than 1 (low irritation), less than 3 (light irritation), less than 5 (moderate irritation), 5 or higher (strong irritation). The irritation results are shown in the following Table 3.

TABLE-US-00003 TABLE 3 Comparative Comparative Exam- Exam- Exam- Test Example 1 Example 2 ple 1 ple 2 ple 3 Skin Irritation 0 (no 0 (no 0 (no 0 (no 0 (no Index (PII) irri- irri- irri- irri- irri- tation) tation) tation) tation) tation)

[0044] As shown in Table 3, Examples 1-3 and Comparative Examples 1 and 2 cause no irritation. Thus, it was shown that they can be used safely for cosmetics.

[0045] Test Example 4: Evaluation of Skin Elasticity for Piezoelectric Cosmetic Compositions

[0046] Comparative Example 2 (conventional W/O emulsion) and Example 1 (liquid crystal emulsion) according to Test Example 1 were evaluated for skin elasticity. Each of Comparative Example 2 and Example 1 was applied to five males and females in a predetermined amount. Two weeks and four weeks after the application, skin elasticity was determined. The results are shown in the following Table 4.

TABLE-US-00004 TABLE 4 Skin Comparative Elasticity Example 2 Example 1 2 weeks 3.7 4.4 4 weeks 5.3 8.8

[0047] After determining skin elasticity, it was shown that skin elasticity was increased by 1.4 times after 4 weeks from 3.7 (2 weeks) in the case of Comparative Example 2. On the contrary, in the case of Example 1 (liquid crystal emulsion), skin elasticity was increased by 2 times after 4 weeks as compared to the skin elasticity after 2 weeks.

[0048] As can be seen from the foregoing, the piezoelectric cosmetic composition according to the present disclosure may be used as a cosmetic agent that helps skin activity.

REFERENCES

[0049] (Patent Document 1) KR10-1050069 B

[0050] (Patent Document 2) KR10-0614799 B

[0051] (Patent Document 3) KR10-1209102 B