Silane according to formula I): I) (R 1) o Si-R 2 -X-A-[Y-A] m -X-R 2 -Si(R 1) o, 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 I) may be bridged via radicals R 1; and wherein the radicals R 2 may independently of one another be identical or different and are selected from the group consisting of linear and branched alkylene groups having 1 to 20 carbon atoms, cycloalkylene groups having 4 to 12 carbon atoms, arylene groups having 6 to 20 carbon atoms, alkenylene groups having 2 to 20 carbon atoms, alkynylene groups having 2 to 20 carbon atoms and aralkylene groups having 7 to 20 carbon atoms; 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-, -R 3 NC(=O)NR 3 -, -R 3 NC(=NR 3)NR 3 -, - R 3 NC(=S)NR 3 -, wherein the radicals R 3 within the group X may be identical or different and are selected from a hydrogen atom or are selected from the group consisting of linear and branched alkyl groups having 1 to 20 carbon atoms, cycloalkyl groups having 4 to 12 carbon atoms, aryl groups having 6 to 20 carbon atoms, alkenyl groups having 2 to 20 carbon atoms, alkynyl groups having 2 to 20 carbon atoms and aralkyl groups having 7 to 20 carbon atoms, with the proviso that at least one R 3 within each group X is a hydrogen atom; and wherein the groups A within a molecule may independently of one another be identical or different and are aromatic groups; and wherein the groups Y independently of one another within a molecule may be identical or different and are selected from the groups -HNC(=O)- and -C(=O)NH-; and wherein m is equal to 1 or 2; and wherein the silane may also be in the form of oligomers formed by hydrolysis and condensation of silanes of formula I). 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 I) may be bridged via radicals R 1; and wherein the radicals R 2 may independently of one another be identical or different and are selected from the group consisting of linear and branched alkylene groups having 1 to 20 carbon atoms, cycloalkylene groups having 4 to 12 carbon atoms, arylene groups having 6 to 20 carbon atoms, alkenylene groups having 2 to 20 carbon atoms, alkynylene groups having 2 to 20 carbon atoms and aralkylene groups having 7 to 20 carbon atoms; 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-, -R 3 NC(=O)NR 3 -, -R 3 NC(=NR 3)NR 3 -, - R 3 NC(=S)NR 3 -, wherein the radicals R 3 within the group X may be identical or different and are selected from a hydrogen atom or are selected from the group consisting of linear and branched alkyl groups having 1 to 20 carbon atoms, cycloalkyl groups having 4 to 12 carbon atoms, aryl groups having 6 to 20 carbon atoms, alkenyl groups having 2 to 20 carbon atoms, alkynyl groups having 2 to 20 carbon atoms and aralkyl groups having 7 to 20 carbon atoms, with the proviso that at least one R 3 within each group X is a hydrogen atom; and wherein the groups A within a molecule may independently of one another be identical or different and are aromatic groups; and wherein the groups Y independently of one another within a molecule may be identical or different and are selected from the groups -HNC(=O)- and -C(=O)NH-; and wherein m is equal to 1 or 2; and wherein the silane may also be in the form of oligomers formed by hydrolysis and condensation of silanes of formula I).