Characteristics and Skin-Improving Effect of Mica Modified with Glycerol Group

Mica was modified with alcoholic hydroxyl group, and the product was characterized in various respects (i.e. the identification of structure, the physical property, and the skin improving effect).The chemical vapor deposition of 1, 3, 5, 7-tetramethylcyclotetrasiloxane (TMCTS) was employed on mica, in which TMCTS was polymerized to form a coating layer of poly (methylsiloxane) (PMS). Mica modified with alcoholic hydroxyl groups was synthesized from PMS-coated mica by hydrosilylation (G-MICA). The alcoholic hydroxyl groups on mica were confirmed by FT-IR, 13C-CP/MAS NMR, and thermal analysis.The property of G-MICA was intermediate between that of hydrophobic and hydrophilic by the contact angle and the adsorption of water. The property of the dual-purpose foundation using G-powder type (powder modified with glycerol group) was the fittingness and the longlasting.The skn-improving effect of G-MICA was recognized by the transepidermal water loss and the scaling amounts.