PURPOSE: To provide a composition for oral cavity application, containing a surface-coated pigment obtained by covering the particles composed of a pigment and a specific water-soluble polymer with inorganic powder, wherein the pigment is exposed by the collapse of the covering layer during the brushing, and the completion of the brushing can be detected by the color change.
CONSTITUTION: A composition for oral cavity application, especially dentifrice, is obtained by preparing particles composed of a pigment and a water-soluble polymer capable of forming a polymer gel by reacting with the polyvalent metallic element in the pigment, coating the particles with inorganic powder, and using the obtained surface-coated pigment as a component. The inorganic powder coating layer is collapsed during the brushing, and the color of the composition is changed by the exposure of the pigment to sense the completion of the brushing. Since the color of the pigment is completely masked with the inorganic powder layer, the dentifrice has good appearance, and since the coating layer is collapsed to induce the change in color only after the sufficient brushing, the brushing time can be surely controlled by the use of this composition.
OIBE MASAAKI
YANAGAWA TAKUMA
| JPS5613683A | 1981-02-10 |