The Novel Inorganic Pigments for Even Skin Tone, Water-resistance and SPF Enhancement
Podium 62
Presented by: Jun Pil HWANG
Introduction:
Makeup cosmetics are divided into base makeup cosmetic and point makeup cosmetic. The purpose of the base makeup cosmetic is to focus on covering imperfections of skin such as blemishes, wrinkles, and spots by applying the product to face for even skin tone. Titanium dioxide, which is the white pigment, is most widely used for covering skin imperfections. Titanium dioxide (TiO2) gives coverage to face due to its high refractive index and diffuse reflection; however, the excessive coverage can create unnatural look on face.
Recently, sunscreen products with brightening effect are drawing attention in the cosmetic market. These sunscreen products contain titanium dioxide in the formula, and they are intended to be made to brighten dull skin (even skin tone) and give natural look on face compared to typical face makeup products. However, ordinary titanium dioxide has a difficulty to present natural skin tone because of its strong coverage.
For this reason, new titanium dioxide where its surface is coated with TiCl4 solution has been developed in the previous research, and developed titanium dioxide gives sheer coverage with less white cast. However, titanium dioxide pigment has a significant drawback; it is hard to apply in the oil-in-water (O/W) type products due to its poor water resistance and results in poor lasting in daily use. Also, some O/W cream with titanium dioxide has stability issue since it has high pH value.
Thus, the main purpose of this research is to devise newly developed titanium dioxide which is expected to have improved UV protection factor, water resistance, and stability by using new water-soluble film former.
Methods:
First, the water resistance of each polymer was measured to select the appropriate film former. Each polymer was applied to O/W sunscreen formula by 1, 2, and 3%, and each formula properties and UV protective effect were evaluated. Then, the selected polymer was coated onto the surface modified titanium dioxide, and its dispersibility was evaluated by spread applicator that has clearance of 120nm. The UV protective effect and adhesiveness were also evaluated as well.
In this study, 28.6mg of each sample was applied on the Helio plates HD 6 (4.7cm X 4.7cm) to estimate the UV protection factor. After 30 minutes, the UV protection factor was measured by UV-2000s of Labsphere Inc. The UV protection factor was expressed in terms of SPF (Sun Protection Factor). The adhesiveness of each formula sample was evaluated by Touch Meter of Heidon Inc.
Results:
The result indicated that the selected polymer has water resistance ability by evaluating the water resistance of water-soluble film formers. Also, the selected polymer increased the SPF value and did not affect the formula properties when it was applied to O/W sunscreen formula. The result also demonstrated that the dispersibility and the adhesiveness increased when the selected polymer was coated onto the surface of newly developed titanium dioxide and applied in O/W sunscreen products. It was also confirmed to have SPF boosting effect.
Discussion and Conclusion:
In this study, newly developed inorganic pigment has water resistance due to the characteristic of coated polymer on the surface of the pigment. Cosmetic products with newly coated titanium dioxide is expected to have improved water resistance that is not affected by sweat or moisture. Furthermore, it has transparency as titanium dioxide developed in previous research and has natural toning effect due to its higher dispersibility.
The research also confirms that newly developed pigment is a functional material with improved SPF value.
Makeup cosmetics are divided into base makeup cosmetic and point makeup cosmetic. The purpose of the base makeup cosmetic is to focus on covering imperfections of skin such as blemishes, wrinkles, and spots by applying the product to face for even skin tone. Titanium dioxide, which is the white pigment, is most widely used for covering skin imperfections. Titanium dioxide (TiO2) gives coverage to face due to its high refractive index and diffuse reflection; however, the excessive coverage can create unnatural look on face.
Recently, sunscreen products with brightening effect are drawing attention in the cosmetic market. These sunscreen products contain titanium dioxide in the formula, and they are intended to be made to brighten dull skin (even skin tone) and give natural look on face compared to typical face makeup products. However, ordinary titanium dioxide has a difficulty to present natural skin tone because of its strong coverage.
For this reason, new titanium dioxide where its surface is coated with TiCl4 solution has been developed in the previous research, and developed titanium dioxide gives sheer coverage with less white cast. However, titanium dioxide pigment has a significant drawback; it is hard to apply in the oil-in-water (O/W) type products due to its poor water resistance and results in poor lasting in daily use. Also, some O/W cream with titanium dioxide has stability issue since it has high pH value.
Thus, the main purpose of this research is to devise newly developed titanium dioxide which is expected to have improved UV protection factor, water resistance, and stability by using new water-soluble film former.
Methods:
First, the water resistance of each polymer was measured to select the appropriate film former. Each polymer was applied to O/W sunscreen formula by 1, 2, and 3%, and each formula properties and UV protective effect were evaluated. Then, the selected polymer was coated onto the surface modified titanium dioxide, and its dispersibility was evaluated by spread applicator that has clearance of 120nm. The UV protective effect and adhesiveness were also evaluated as well.
In this study, 28.6mg of each sample was applied on the Helio plates HD 6 (4.7cm X 4.7cm) to estimate the UV protection factor. After 30 minutes, the UV protection factor was measured by UV-2000s of Labsphere Inc. The UV protection factor was expressed in terms of SPF (Sun Protection Factor). The adhesiveness of each formula sample was evaluated by Touch Meter of Heidon Inc.
Results:
The result indicated that the selected polymer has water resistance ability by evaluating the water resistance of water-soluble film formers. Also, the selected polymer increased the SPF value and did not affect the formula properties when it was applied to O/W sunscreen formula. The result also demonstrated that the dispersibility and the adhesiveness increased when the selected polymer was coated onto the surface of newly developed titanium dioxide and applied in O/W sunscreen products. It was also confirmed to have SPF boosting effect.
Discussion and Conclusion:
In this study, newly developed inorganic pigment has water resistance due to the characteristic of coated polymer on the surface of the pigment. Cosmetic products with newly coated titanium dioxide is expected to have improved water resistance that is not affected by sweat or moisture. Furthermore, it has transparency as titanium dioxide developed in previous research and has natural toning effect due to its higher dispersibility.
The research also confirms that newly developed pigment is a functional material with improved SPF value.