Patent ID: 7833340

Claim:
A coating material for forming a photocatalytic film, comprising a particle group A, a particle group B and a solvent, wherein the particles of group A are titanium oxide, the number of necking particles of the particle group A is larger than the number of necking particles of the particle group B, wherein “the number of necking particles” here is referred to the total number of particles constituting all necking particles with each constituting particle being considered as the unit particle, wherein in the mass particle size distribution by the laser Doppler method, the particle group B has a peak at 8 to 400 nm, and the particle group A has a peak at 800 to 5,500 nm, and wherein the ratio X/Y of the mass X of the particle group A to the dry mass Y of the particle group B is from 0.01 to 0.2.