Silane according to formula II): II) ((R 1) o Si-R 2 -X-R 2 -) 2 Y-R 2 -S-R 3 wherein o = 3 and the radicals R 1 may independently of one another be identical or different and are selected from alkoxy groups having 1 to 10 carbon atoms, cycloalkoxy groups having 4 to 10 carbon atoms, phenoxy groups having 6 to 20 carbon atoms, aryl groups having 6 to 20 carbon atoms, alkyl groups having 1 to 10 carbon atoms, alkenyl groups having 2 to 20 carbon atoms, alkynyl groups having 2 to 20 carbon atoms, aralkyl groups having 7 to 20 carbon atoms, halides or alkyl polyether groups -O-(R 6 -O) r -R 5, wherein R 6 are identical or different and are branched or unbranched, saturated or unsaturated, aliphatic, aromatic or mixed aliphatic/aromatic bridging C 1 -C 30 hydrocarbon groups, r are an integer from 1 to 30 and R 5 are unsubstituted or substituted, branched or unbranched, terminal alkyl, alkenyl, aryl or aralkyl groups or two R 1 form a cyclic dialkoxy group having 2 to 10 carbon atoms or two or more silanes according to formula II) may be bridged via radicals R 1; and wherein the radicals R 2 may independently of one another be identical or different and are linear alkylene groups having 1 to 20 carbon atoms; and wherein the group R 3 is a hydrogen atom or a -C(=O)-R 4 group or a -SiR 8 3 -group, wherein R 4 and R 8 are selected from C 1 -C 20 alkyl groups, C 4 -C 10 cycloalkyl groups, C 6 -C 20 aryl groups, C 2 -C 20 alkenyl groups, and C 7 -C 20 aralkyl groups and R 8 is additionally selected from alkoxy groups having 1 to 10 carbon atoms, cycloalkoxy groups having 4 to 10 carbon atoms, phenoxy groups having 6 to 20 carbon atoms; and wherein Y is a trivalent nitrogen atom; and wherein the groups X may independently of one another be identical or different and are selected from the groups -HNC(=O)-, -C(=O)NH-, -C(=O)O-, -OC(=O)-, -OC(=O)NH-, -HNC(=O)O-,-HNC(=O)NH-, and wherein the silane may also be in the form of oligomers formed by hydrolysis and condensation of silanes of formula II). wherein o = 3 and the radicals R 1 may independently of one another be identical or different and are selected from alkoxy groups having 1 to 10 carbon atoms, cycloalkoxy groups having 4 to 10 carbon atoms, phenoxy groups having 6 to 20 carbon atoms, aryl groups having 6 to 20 carbon atoms, alkyl groups having 1 to 10 carbon atoms, alkenyl groups having 2 to 20 carbon atoms, alkynyl groups having 2 to 20 carbon atoms, aralkyl groups having 7 to 20 carbon atoms, halides or alkyl polyether groups -O-(R 6 -O) r -R 5, wherein R 6 are identical or different and are branched or unbranched, saturated or unsaturated, aliphatic, aromatic or mixed aliphatic/aromatic bridging C 1 -C 30 hydrocarbon groups, r are an integer from 1 to 30 and R 5 are unsubstituted or substituted, branched or unbranched, terminal alkyl, alkenyl, aryl or aralkyl groups or two R 1 form a cyclic dialkoxy group having 2 to 10 carbon atoms or two or more silanes according to formula II) may be bridged via radicals R 1; and wherein the radicals R 2 may independently of one another be identical or different and are linear alkylene groups having 1 to 20 carbon atoms; and wherein the group R 3 is a hydrogen atom or a -C(=O)-R 4 group or a -SiR 8 3 -group, wherein R 4 and R 8 are selected from C 1 -C 20 alkyl groups, C 4 -C 10 cycloalkyl groups, C 6 -C 20 aryl groups, C 2 -C 20 alkenyl groups, and C 7 -C 20 aralkyl groups and R 8 is additionally selected from alkoxy groups having 1 to 10 carbon atoms, cycloalkoxy groups having 4 to 10 carbon atoms, phenoxy groups having 6 to 20 carbon atoms; and wherein Y is a trivalent nitrogen atom; and wherein the groups X may independently of one another be identical or different and are selected from the groups -HNC(=O)-, -C(=O)NH-, -C(=O)O-, -OC(=O)-, -OC(=O)NH-, -HNC(=O)O-,-HNC(=O)NH-, and wherein the silane may also be in the form of oligomers formed by hydrolysis and condensation of silanes of formula II).