化粧品における粘土鉱物の役割 : 雲母チタンを用いた機能性メーキャップ(<シンポジウム特集>生活空間・身の回りの粘土 : 粘土圏環境における粘土の利用)
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概要
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Pearl pigments are materials made by depositing titanium oxide thin layer on platy clay minerals such as mica. They are very useful in cosmetic industry. Usually, they are used for cosmetics formulae for giving a bright appearance on the lips or the skin. On the other hand, noble makeups using pearl pigment in quite different ways have been developed recently. 'Neo-chiaroscuro' makeup presents a new concept of makeup that can highlight and contour the face and allow the face to look slim. These unique functions are based on light reflection and absorption. A material that can give neo-chiaroscuro makeup is a pearl pigment of which surface is chemically reduced. It is called titanium lower oxide coated mica. By using this new cosmetic material, we have developed a makeup cosmetic that is designed to reflect a strong light coming from the front of the face to make a bright portion and absorb a light coming aslant to make the dark portion, resulting in the appearance of the contoured and slim-looking face. Another pearl pigment is used to create a noble makeup for masking severe skin color problems such as Ota's nevus. Ota's nevus is very difficult to be masked by an ordinal hiding makeup technique such as using a conventional foundation with a high covering capability. The appearance of the face looks unnatural when the foundations or other makeups are applied heavily for covering the birthmark. However, the new foundation containing titanium oxide coated mica, which splits incident light into reflected light and transmitted light of complementary colors due to the interference phenomenon can vanish the birthmark even when it is applied lightly on the face. The phenomena is based on a new photo-complementary theory-the transmitted light from the titanium oxide coated mica that is complementary color to the birthmark compensates for the conspicuous birthmark. These two pearl pigments for cosmetics are very significant and make the cosmetics more valuable. The flat and smooth structure of clay minerals enables us to develop these unique materials.
- 2005-04-05