Patent ID: 7998583

Claim:
Nanoparticulate silicone organocopolymers in the form of an aqueous polymer dispersion or water-redispersible polymer powder, prepared by a process comprising free-radical initiated polymerization in an aqueous medium to form an aqueous polymer dispersion and optionally, subsequent drying of the resultant polymer dispersion, of A) one or more first monomers selected from the group consisting of vinyl esters, (meth)acrylic esters, vinylaromatics, olefins, 1,3-dienes, vinyl ethers and vinyl halides and optionally copolymerizing further monomers copolymerizable with said first monomers, in the presence of B) at least one particle P having an average diameter of ≦1000 nm, which is functionalized with ethylenically unsaturated, free-radically polymerizable groups, where B1) the particles P comprise one or more particles selected from the group of metal oxides and semimetal oxides, and/or B2) the particles P comprise silicone resins of the formula [R 4 (p+z) SiO (4−p−z)/2 ] m (II), the individual radicals R 4 each independently of one another being hydrogen, hydroxyl, alkyl, cycloalkyl, aryl, alkoxy or aryloxy radicals having up to 18 C atoms, which may optionally be substituted, m is an integral number ≧30, and where, for at least 20 mol% of the respective silicone resin, p+z=0, 1 or 3, and C) one or more linear polydiorganosiloxanes of the formula R 9 3 SiO—[R 8 2 SiO 2/2 ] n —SiR 9 3 (III), where the individual radicals R 8 and R 9 each independently of one another are hydroxyl, alkyl, cycloalkyl, aryl, alkoxy or aryloxy radicals having up to 18 C atoms, which may optionally be substituted, and where at least one of the radicals R 9 is a hydroxyl, alkoxy or aryloxy radical, and n is an integral number ≦100, and where B1), B2) and C) are each functionalized with one or more α-organosilanes of the general formula (R 1 O) 3−k (R 2 ) k Si—(CR 3 2 )—X (I), where R 1 is hydrogen, an alkyl radical having 1 to 6 carbon atoms or an aryl radical, R 2 and R 3 each independently of one another are hydrogen, an alkyl radical having 1 to 12 carbon atoms or an aryl radical, k is 0, 1 or 2, and X is a radical having 2 to 20 hydrocarbon atoms with an ethylenically unsaturated group.