Abstract
In order to develop an excellent lipstick without darkened color or difference between the product colors and the applied ones, mainly due to aggregation of pigments, we have developed a novel “Ultra-thin silicone coating” technology utilizing a catalytic activity of the pigment surface, and furthermore, a modification technology of this film by introducing functional molecules with an additional reaction.
The treated pigments with this novel coating and modification techologies maintained the original fine particle size and showed an excellent dispersibility in oils. By formulating these pigments into lipsticks, they provided various superiorities to the conventional lipstick as follows.
(1) Show bright, vivid, and glossy color.
(2) Not recognize the difference between the product colors and the applied ones.
(3) Long-lasting effect on the lips when applied.
(4) No sweating in a long period.
Moreover, we could develop a new emulsion type lipstick, since the pigments did not aggregate under the presence of water because of the provided hydrophobicity. The emulsion lipstick has two excellent properties in addition to (1)-(4).
(5) Soft usability like cream.
(6) Protects lips better than conventional lipstick because of moist effect.
