Patent ID: 8084531

Claim:
Particles (P) comprising a core comprising metal atoms, silicon atoms, or metal and silicon atoms, together with oxygen atoms, or a core comprising silicone resin, the particles possessing at least one protected isocyanate group on their surface, the particles (P) prepared by reacting particles (P1) comprising metal atoms, silicon atoms, or silicon and metal atoms, together with oxygen atoms, or comprising a silicone resin, the particles (P1) possessing free hydroxyl functions, with organosilanes (A1) to give, as an intermediate, NH-, OH- or SH-functional particles (P2), which in a further reaction step are reacted with a compound (A2) which possesses not only at least one protected isocyanate function but also an unprotected isocyanate function, to give the particles (P), wherein the organosilanes (A1) are of the formulae (II), (IIa), (III), (IIIa) or (IX) the aminoalkyl- or hydroxyalkyl-functional particles (P2) obtained as an intermediate in that reaction being reacted in a 2 nd reaction step with a part-protected isocyanate (A2) of the general formula (XII) OCN—Y—(NH—C(O)—X) z (XII) to give the particles (P), wherein R 1 is hydrogen, alkyl, cycloalkyl or aryl radical having 1 to 6 C atoms, the carbon chain optionally interrupted by nonadjacent oxygen, sulfur or NR 3 groups, R 2 is alkyl, cycloalkyl, aryl or arylalkyl radical having 1 to 12 C atoms, the carbon chain optionally interrupted by nonadjacent oxygen, sulfur or NR 3 groups, R 3 is a hydrogen, alkyl, cycloalkyl, aryl, arylalkyl, aminoalkyl or aspartate ester radical, X is a protective group which is eliminated at temperatures below 300° C. in the form of HX, and in being eliminated liberates an isocyanate function, and n is 0, 1 or 2, Y is a (z+1)-functional aliphatic or aromatic radical, m is 0, 1,or 2, x is between 1 to 10, A is oxygen, sulfur, a group of the formula NR 3 or a nitrogen atom which is part of a heterocyclic ring, and B is hydrogen or a carbon-containing radical.