Composition comprising - at least one polymer containing silane groups; and - at least one catalyst of the formula A⁅Z] n wherein n is an integer from 2 to 20 A is an n-valent aliphatic or cycloaliphatic or arylaliphatic hydrocarbon radical having 2 to 100 carbon atoms, optionally comprising unsaturated moieties, optionally comprising heteroatoms and optionally comprising amino groups, and Z is a radical of the formula wherein R 1 and R 0 are each independently hydrogen or an alkyl or cycloalkyl or aralkyl radical having 1 to 8 carbon atoms, R 2 is hydrogen or an alkyl, cycloalkyl or aralkyl radical having 1 to 18 carbon atoms, optionally comprising heteroatoms and optionally comprising terminal primary or secondary amino groups, R 3 is -NR 4 R 5 or hydrogen or an alkyl, cycloalkyl or aralkyl radical having 1 to 12 carbon atoms, R 4 and R 5 are each independently hydrogen or an alkyl, cycloalkyl or aralkyl radical having 1 to 18 carbon atoms, optionally comprising heteroatoms, wherein R 1 and R 2 together may also be an alkylene radical having 2 to 6 carbon atoms, R 2 and R 0 together may also be an alkylene radical having 3 to 6 carbon atoms, optionally comprising heteroatoms, R 2 and R 3 together may also be an alkylene radical having 3 to 6 carbon atoms, R 4 and R 5 together may also be an alkylene radical having 4 to 7 carbon atoms, optionally comprising heteroatoms, and R 2 and R 5 together may also be an alkylene radical having 2 to 12 carbon atoms; wherein the catalyst of the formula does not comprise a nitrogen atom which is bonded directly to an aromatic ring or is part of a heteroaromatic ring system and wherein the catalyst of the formula is free of silane groups. - at least one polymer containing silane groups; and - at least one catalyst of the formula A⁅Z] n wherein n is an integer from 2 to 20 A is an n-valent aliphatic or cycloaliphatic or arylaliphatic hydrocarbon radical having 2 to 100 carbon atoms, optionally comprising unsaturated moieties, optionally comprising heteroatoms and optionally comprising amino groups, and Z is a radical of the formula wherein R 1 and R 0 are each independently hydrogen or an alkyl or cycloalkyl or aralkyl radical having 1 to 8 carbon atoms, R 2 is hydrogen or an alkyl, cycloalkyl or aralkyl radical having 1 to 18 carbon atoms, optionally comprising heteroatoms and optionally comprising terminal primary or secondary amino groups, R 3 is -NR 4 R 5 or hydrogen or an alkyl, cycloalkyl or aralkyl radical having 1 to 12 carbon atoms, R 4 and R 5 are each independently hydrogen or an alkyl, cycloalkyl or aralkyl radical having 1 to 18 carbon atoms, optionally comprising heteroatoms, wherein R 1 and R 2 together may also be an alkylene radical having 2 to 6 carbon atoms, R 2 and R 0 together may also be an alkylene radical having 3 to 6 carbon atoms, optionally comprising heteroatoms, R 2 and R 3 together may also be an alkylene radical having 3 to 6 carbon atoms, R 4 and R 5 together may also be an alkylene radical having 4 to 7 carbon atoms, optionally comprising heteroatoms, and R 2 and R 5 together may also be an alkylene radical having 2 to 12 carbon atoms; wherein the catalyst of the formula does not comprise a nitrogen atom which is bonded directly to an aromatic ring or is part of a heteroaromatic ring system and wherein the catalyst of the formula is free of silane groups. n is an integer from 2 to 20 A is an n-valent aliphatic or cycloaliphatic or arylaliphatic hydrocarbon radical having 2 to 100 carbon atoms, optionally comprising unsaturated moieties, optionally comprising heteroatoms and optionally comprising amino groups, and Z is a radical of the formula wherein R 1 and R 0 are each independently hydrogen or an alkyl or cycloalkyl or aralkyl radical having 1 to 8 carbon atoms, R 2 is hydrogen or an alkyl, cycloalkyl or aralkyl radical having 1 to 18 carbon atoms, optionally comprising heteroatoms and optionally comprising terminal primary or secondary amino groups, R 3 is -NR 4 R 5 or hydrogen or an alkyl, cycloalkyl or aralkyl radical having 1 to 12 carbon atoms, R 4 and R 5 are each independently hydrogen or an alkyl, cycloalkyl or aralkyl radical having 1 to 18 carbon atoms, optionally comprising heteroatoms, wherein R 1 and R 2 together may also be an alkylene radical having 2 to 6 carbon atoms, R 2 and R 0 together may also be an alkylene radical having 3 to 6 carbon atoms, optionally comprising heteroatoms, R 2 and R 3 together may also be an alkylene radical having 3 to 6 carbon atoms, R 4 and R 5 together may also be an alkylene radical having 4 to 7 carbon atoms, optionally comprising heteroatoms, and R 2 and R 5 together may also be an alkylene radical having 2 to 12 carbon atoms;