Patent ID: 8530048

Claim:
Surface-modified inorganic-based nanoparticles, wherein the nanoparticles comprise reactive groups on their surface, wherein the nanoparticles have been reacted with the polysiloxane-based modifier on their surface under the formation of covalent chemical bonds, wherein: the modifier is a polysiloxane with the following general formula (R 1 x R 2 3-x SiR 3 ) y R 4 whereby in the general formula: x=0 to 2 including the limits; y=1 to 10 including the limits; R 1 =a monovalent organic radical having 1 to 18 carbon atoms; R 2 =OH group or hydrolysable group comprising or consisting of: a linear or branched or cyclic alkoxy group having 1 to 6 carbon atoms, a halogen atom, or a carboxylic acid radical having 1 to 4 carbon atoms; R 3 =oxygen or an at least divalent organic radical comprising or consisting of: a linear or branched alkylene radical having 1 to 8 carbon atoms, an alkylene ether, an alkylene thioether, an alkylene polyether based on ethylene oxide, propylene oxide, butylene oxide or styrene oxide or mixtures of the oxides or based on a statistic or block polyether, an arylene polyether, an alkylene polyester or an organic aliphatic or aromatic or arylaliphatic group; R 4 =mono- or polyvalent radical comprising or consisting of a polydialkylsiloxane having 4 to 200 Si units and with C 1 -C 18 alkyl groups on the silicon atoms, whereby the C 1 -C 18 alkyl groups are partially and in each case independently of one another replaced or substituted by one or more of the following modifying groups (G) selected from the following modifying groups (G1) to (G4) listed under (i) to (iv): (i). group (G1) containing (poly)ether groups, (ii) group (G2) containing polyester groups, (iii) group (G3) containing arylalkyl groups, (iv) group (G4) containing perfluorinated alkyl groups, wherein: the group (G1) containing the (poly) ether groups is based on at least one alkylene oxide of the general formula wherein the radical R′ denotes a hydrogen atom, a phenyl radical or an alkyl radical or is based on a mixture of at least two or these alkylene oxides; and the group (G1) containing the (poly)ether groups has a molar mass in the range of 116 to 15,000 Dalton; and the ratio of the mass of the poly(di)alkylsiloxane and the modified group (G1) lies in the range 12:1 to 0.07:1; and the group (G2) containing the polyester groups is a group containing an aliphatic and/or cycloaliphatic and/or aromatic polyester group or a group containing one of these groups; and the group (G2) containing the polyester groups contains at least three groups the group (G2) containing the polyester groups has a molar mass in the range of 344 to 4,000 Dalton; and the ratio of the mass of the poly(di)alkylsiloxane and the modified group (G2) lies in the range of 1:5 to 1:0.05; and the group (G3) containing the arylalkyl groups is a phenylpropyl group or a group containing this group; and the group (G4) containing the perfluorinated alkyl group is a perfluorinated alkyl group having 3 to 8 carbon atoms or a group containing this group.