Binders containing nanoparticles

A method for stabilizing inorganic nanoparticles, wherein the method comprises forming an aqueous formulation comprising

• A) a silane-modified copolymer comprising groups of general formula (1)
• —Si(R1O)2R2 (1)
• wherein
• R1 is a C2- to C8-alkyl radical;
• and
• R2 is (R1O) or a C1- to C5-alkyl radical,
• built up from
• I) a hydroxy-functional hydrophobic polymer containing as builder monomers
• Ia) (meth)acrylic acid esters having C1- to C18-hydrocarbon radicals in the alcohol part and/or vinylaromatics and/or vinyl esters;
• Ib) hydroxy-functional monomers;
• and
• IS1) silane-functional monomers capable of polymerization;
• and
• II) a hydroxy-functional hydrophilic polymer containing as builder components
• IIa) (meth)acrylic acid esters having C1- to C18-hydrocarbon radicals in the alcohol part and/or vinylaromatics and/or vinyl esters;
• IIb) hydroxy-functional monomers;
• and
• IIc) acid-functional monomers;
• B) inorganic particles which are optionally surface-modified, and having an average particle size (z-mean), as determined by means of dynamic light scattering in dispersion, of less than 200 nm, wherein said inorganic particles B) are inorganic nanoparticles in a colloidally disperse form in organic solvents or in water;
• and
• C) water;
• wherein the inorganic particles are introduced by mechanical stirring.