Abstract
Recently, various kinds of powdery cosmetics with multiple colors or unique surface patterns have been developed, but they are often difficult to mold. In this case we can use binders such as oil, wax and ultra fine particles in the molding process, but those binders sometimes cause the problem of “caking”. In this work, we studied petal-like calcium silicate(P-CS), which is one of the tablet molding binders in the pharmaceutical field, as a new dry binder for powdery cosmetics. We evaluated properties of P-CS by measuring the kinematic friction for the texture, Olzen hardness for the binding effect and the powder amount paid off for the usefulness as a cosmetic. From those results, it was found that size modified P-CS(10) had three unique properties as a binder for cosmetics : 1)P-CS(10) has a smooth and silky feeling when actually used for cosmetics, 2) the molded powdery cosmetics containing P-CS(10) resist causing caking and 3) the molded powdery cosmetics containing P-CS(10) have constant pay off across a wide range of hardness. Finally we developed an ultimate 3D powdery cosmetic that has a desirable texture and excellent usefulness without caking by using those properties.
