Dispersion comprising colloidal silica particles and zinc cyanurate particles

A dispersion in which dispersoid particles comprising colloidal silica particles and zinc cyanurate particles are dispersed in a liquid medium,

• wherein the colloidal silica particles have an average particle diameter of 5 to 500 nm, and the dispersion contains 0.1 to 40% by mass of the colloidal silica particles in terms of SiO2 concentration,
• wherein primary particles of the zinc cyanurate particles have a major axis length of 50 to 1000 nm and a minor axis length of 10 to 300 nm as observed with a transmission electron microscope, and have a ratio of the major axis length to the minor axis length of 2 to 25, and the dispersion contains 0.1 to 50% by mass of the zinc cyanurate particles in terms of solids content, and
• wherein the dispersoid particles comprising the colloidal silica particles and the zinc cyanurate particles have an average particle diameter of 80 to 2000 nm based on a laser diffraction method, and the dispersion contains 0.2 to 50.1% by mass of the colloidal silica particles and the zinc cyanurate particles in terms of total solids content of both particles.