FLUORESCENT PARTICLE,METHOD FOR PREPARING THE SAME AND PAPERFOR PREVENTING FORGERY USING THE FLUORESCENT PARTICLE

摘要

Fluorescent particles strongly fluorescing upon irradiation with ultraviolet rays, as well as a process for producing the same, are provided. A water-insoluble fluorescent dyestuff and/or pigment fluorescing upon irradiation with ultraviolet rays and a powdery material including starch, cellulose, other polysaccharides and sugars are mixed and granulated. The surface of granules of the powdery material may be coated with the fluorescent dyestuff and/or pigment. In granulation or coating, a resin having reactive groups reacting with the hydroxyl groups of the powdery material is used in combination, whereby particles excellent in water resistance can be obtained. By inclusion of the fluorescent particles in paper, there can be provided anti-falsification paper wherein the particles fluorescing in a specific hue can be clearly visually recognized upon irradiation with ultraviolet rays.