Patent ID: 7674868

Claim:
Copolymers of ethylenically unsaturated monomers and of ethylenically functionalized nanoparticles in the form of their aqueous polymer dispersions or water-redispersible polymer powders, obtained by a process comprising free-radically polymerizing in an aqueous medium and, in the case of redispersible polymer powders, 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 composition P having an average diameter of particles of ≦1000 nm, the particles functionalized with ethylenically unsaturated, free-radically polymerizable groups, wherein B1) particles P comprise metal oxides, semimetal oxides, or mixtures thereof, and/or B2) particles P comprise silicone resins comprising repeating units of the formula [R 4 (p+Z) SiO (4−p−Z)/2 ] (II), each R 4 being identical or different and denoting hydrogen, hydroxyl, or alkyl, cycloalkyl, aryl, alkoxy or aryloxy radicals each having up to 18 carbon atoms and being able to be optionally substituted, where for at least 20 mol % of the respective silicone resin p and z are integers from 0 to 3 and p+z=0, 1 or 3, wherein the particles B2) contain radicals R 4 , where B1) and B2) are each functionalized with one or more α-organosilanes of the formula (R 1 O) 3−n (R 2 ) n 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, n can be 0, 1 or 2 and X is a radical having 2 to 20 carbon atoms and containing at least one ethylenically unsaturated group, and wherein particles B2) are present in the particle composition P.