A stable, aqueous dispersion, which includes:

  • silicon dioxide mixed-oxide particles dispersed in at least one water-soluble cationic polymer having a mass average molar mass of less than 100,000 g/mol, said mixed-oxide including aluminum oxide or titanium dioxide,
  • wherein said particles are produced by flame hydrolysis,
  • wherein said particles have a BET specific surface area of 5 to 600 m2/g and a negative zeta potential,
  • and wherein the dispersion has a positive zeta potential.
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