DISPERSION COMPRISING CERIUM OXIDE AND COLLOIDAL SILICON DIOXIDE

摘要

A dispersion comprising cerium oxide particles and colloidal silicon dioxide particles, where - the zeta potential of the silicon dioxide particles is negative and that of the cerium oxide particles is positive or equal to zero, and the zeta potential of the dispersion is negative overall, and - the mean particle diameter of the cerium oxide particles is not more than 200 nm and that of the silicon dioxide particles is not more than 100 nm, the mean particle diameter of the cerium oxide particles being greater than that of the silicon dioxide particles - the cerium oxide/silicon dioxide weight ratio is from 1.1:1 to 100:1 and - the pH of the dispersion is from 7.5 to 10.5.