球状粘土鉱物の開発と機能性粉体への応用

抄録

The swelling clay is mainly used as the gel agent in cosmetics. In this study, the swelling clay has been applied to the body of the functional powder in cosmetics, taking advantage of its gelation ability and property of intercalation.
The nobel spherical clay was obtained by spray drying the hydro gel of a synthetic hectorite. No swelling clay other than the synthetic hectorite was formed sphericaly in shape by the spray drying process. This is the reason the particle size of this synthetic hectorite is very small, c.a. 100Å, compared with that of the other swelling clay.
Making use of this preparation of the spherical clay, two types of the spherical functional powder have been developed by the way of spray drying the gel of the synthetic hectorite including the various functional material, The first type is the spherical powder containing the functional molecules intecalated in the interlayer of the clay particle. The functional molecules are, for example, moisturizer, perfume, antimicrobial agent, UV absober, dye and so on. The spherical clay intercalating glycerin as the functional molecule has been prepared as the moisutre powder. This powder has a high fluidity even though the amount of glycerin in this powder is 40% by weight.
On the second type of the spherical powder, the fine particle is selected as the functional material. This spherical functional powder contains uniformly fine particles both to the surface and inside of the powder. The fine particles such as titanium dioxide, zinc oxide and ferric oxide, or these colloidal particles can be embeded in the powder as the functional particles. In the case of the titanium dioxide, the surface activity of titanium dioxide has been suppressed because most titanium dioxide particles are embeded in the powder. This spherical powder showed excellent slippage and useability, exhibiting UV protect effect.
These powder will be used conveniently in many cosmetics, exhibiting each function according to the functional material contained.