Patent ID: 7402368

Claim:
Hydrophobic inorganic fine particles comprising a mixture obtained by mixing at least small-particle-diameter inorganic fine particles and large-particle-diameter inorganic fine particles; said small-particle-diameter inorganic fine particles having an average primary particle diameter of from 5 nm to 25 nm in number-based particle size distribution and having a maximum peak particle diameter of 20 nm or less in number-based particle size distribution; said large-particle-diameter inorganic fine particles having an average primary particle diameter in number-based particle size distribution which is from 1.5 to 100 times said average primary particle diameter of said small-particle-diameter inorganic fine particles in number-based particle size distribution; and said mixture being a mixture having been treated in the same treating tank to subject both said small-particle-diameter inorganic fine particles and said large-particle-diameter inorganic fine particles simultaneously to hydrophobic treatment.