COATING AGENT COMPOSITION

PROBLEM TO BE SOLVED: To provide a coating agent composition for developing weather resistance and photocatalytic activity of a coating by compounding monoclinic titanium dioxide. SOLUTION: This coating agent composition comprises compounding fibrous single crystal system titanium dioxide which has an average fiber diameter of 0.1-5 μm, an average fiber length of 3-150 μm, and an average aspect ratio of 3-20, into a binder resin in a weight ratio of the titanium dioxide/the binder resin = 2/8-7/3. Further, according to demand, a silane coupling agent, a surfactant, a defoaming agent, a viscosity modifier, a solvent or the like is compounded into the composition. A paint comprising the composition is applied, dried, and then cured at a high temperature. The resulted coating surface is abraded and the titanium dioxide may be exposed to the surface. Monoclinic titanium dioxide is obtained by oxidatively treating a tetrapotassium titanate to produce titanium dioxide hydrated fiber, and heat-treating the fiber at 80-650 deg.C, and then at 500-650 deg.C. As the binder, is used a fluorine plastic, a vinyl chloride resin, a silicone resin, an epoxy resin, a urethane resin, or the like.