Stabilized, aqueous silicon dioxide dispersion

US7374787B2 · kind B2 · utility

Assignee

• Dequssa AG · DE

Inventors

• Wolfgang Lortz · Wächtersbach, DE
• Christoph Batz-Sohn · Hanau, DE
• Gabriele Perlet · Großkrotzenburg, DE
• Werner Will · Gelnhausen, DE
• Gerrit Schneider · Hanau, DE
• Peter Neugebauer · Barmstedt, DE

Key dates

• Filing date: Aug 21, 2003
• Grant date: May 20, 2008
• Expiry date: Jul 11, 2024

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H19/40
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

An aqueous dispersion, having a silicon dioxide powder having a silicon dioxide content of 10 to 60 wt.%, wherein the aqueous dispersion is stable in the pH range of 2 to 6, the aqueous dispersion additionally contains at least one compound, which is at least partially soluble in aqueous solution in the pH range 2 to 6 in the form of polyvalent cations, these being stable in a silicate-like environment as an anionic component of the particle surface of the silicon dioxide powder, the quantity of cation-providing compound in relation to the surface of the silicon dioxide is 0.001 to 0.1 mg cation-providing compound/m2 silicon dioxide surface, the cation-providing compound being calculated as the oxide, and the zeta potential of the aqueous dispersion has values of less than or equal to zero.