植物由来の高純度パラフィンワックスと植物ワックスの混合によるオイルゲル化能制御

Abstract

Oil gels are obtained by heating and mixing oils and solid waxes, followed by cooling. They are mainly used in stick cosmetics, such as lipsticks, foundations, and antiperspirants 1) . Hydrocarbon waxes, such as paraffin waxes and synthetic waxes, are mainly used as gelling agents for oil gels 2,3) . However, the replacement of hydrocarbon waxes by botanical waxes from the point of view of substitution by renewable resources and regulation of petroleum-or mineralderived ingredients in the cosmetic industry is desired.However, the oil gel hardness of botanical waxes (such as rice bran wax, carnauba wax, and candelilla wax) is much lower than that of petroleum-derived waxes 4) . Many studies have been conducted to improve the gel hardness of botanical wax. Mixing different types of waxes sometimes causes gel hardness to vary. For example, a mixture of higher alcohols and fatty acids 5) , a mixture of candelilla wax and carnauba wax 4) , the addition of high-purity esters to candelilla wax 6) , and the addition of high-melting-point alcohols to rice bran wax 7) , can improve gel hardness.Gel hardness can be increased by removing impurities from the botanical waxes and obtaining only the main component. Currently, highly purified botanical waxes, such as hydrocarbon and ester mixture extracted from candelilla wax, and hydrocarbon extracted from rice bran wax are commercially available. However, the gel hardness of these highly purified waxes is still lower than that of commercial hydrocarbon waxes.