FIELD: chemistry.
SUBSTANCE: invention can be used to obtain silicon dioxide dispersions. A dispersion of porous anionic particles of silicon dioxide with a modified surface contains a liquid and silicon dioxide particles. The maximum fractional filled volume (Fmax) of the said particles in the said liquid is at least 0.55 and can be calculated using formula 
, where F is the fractional filled volume of solid substances in the liquid, Fmax is asymptotic limit of the fractional filled volume while approaching infinity, b is intrinsic viscosity, η0 is viscosity of the liquid/solvent, η is viscosity of the dispersion. The dispersion is obtained by forming a suspension from silicon oxide particles and liquid with its subsequent grinding. The said suspension contains a chemical agent which increases the volume fraction of the particles in the dispersion. The invention also relates to a coating composition and a coating on a substrate which contains the said dispersion.
EFFECT: invention enables to obtain stable silicon dioxide dispersions with high content of solid substances.
31 cl, 2 tbl, 5 ex
