An amine of formula in which A stands for the radical of an amine after removal of a primary aliphatic amino groups; a stands for an integer from 1 to 6 with the provision that in the case when a = 1, the radical A has at least one reactive group selected from the group consisting of primary amino groups, secondary amino groups, hydroxyl groups, mercapto groups and silane groups; R 1 and R 2 either independently of one another each stand for a monovalent hydrocarbon radical with 1 to 12 carbon atoms, or together they stand for a divalent hydrocarbon radical with 4 to 12 carbon atoms, which is part of an optionally substituted carbocyclic ring with 5 to 8 carbon atoms, preferably 6 carbon atoms; R 3 stands for a hydrogen atom or an alkyl group or an arylalkyl group or an alkoxycarbonyl group each with 1 to 12 carbon atoms, and X stands for a radical selected from the group consisting of X a, X b, X c and X d, wherein X a stands for ---OR 4 where R 4 stands for a hydrogen or a hydrocarbon radical with 1 to 20 carbon atoms, optionally having at least one heteroatom, in particular oxygen in the form of ether, carbonyl or ester groups; X b stands for wherein R 5 stands for a hydrogen or a hydrocarbon radical with 1 to 20 carbon atoms, which optionally has at least one heteroatom in particular oxygen in the form of ether, carbonyl or ester groups; X c stands for wherein Y stands for O or S and R 6 and R 7 either together stand for a divalent radical having 2 to 10 carbon atoms, optionally having oxygen or sulfur atoms, this radical being part of optionally substituted five-, six- or seven-membered ring, or R 6 stands for an alkyl, cycloalkyl, arylalkyl or acyl radical with 1 to 10 carbon atoms and R 7 stands for a hydrogen or a monovalent radical with 1 to 20 carbon atoms, selected from the group consisting of an alkyl radical, cycloalkyl radical, arylalkyl radical, aryl radical, -OR 8, -SR 8 and -NR 8 R 9, where R 8 and R 9 either each stand for a hydrocarbon radical or together stand for an alkylene radical which is part of five-, six- or seven-membered ring; and X d stands for a substituted or unsubstituted aryl radical. A stands for the radical of an amine after removal of a primary aliphatic amino groups; a stands for an integer from 1 to 6 with the provision that in the case when a = 1, the radical A has at least one reactive group selected from the group consisting of primary amino groups, secondary amino groups, hydroxyl groups, mercapto groups and silane groups; R 1 and R 2 either independently of one another each stand for a monovalent hydrocarbon radical with 1 to 12 carbon atoms, or together they stand for a divalent hydrocarbon radical with 4 to 12 carbon atoms, which is part of an optionally substituted carbocyclic ring with 5 to 8 carbon atoms, preferably 6 carbon atoms; independently of one another each stand for a monovalent hydrocarbon radical with 1 to 12 carbon atoms, or together they stand for a divalent hydrocarbon radical with 4 to 12 carbon atoms, which is part of an optionally substituted carbocyclic ring with 5 to 8 carbon atoms, preferably 6 carbon atoms; R 3 stands for a hydrogen atom or an alkyl group or an arylalkyl group or an alkoxycarbonyl group each with 1 to 12 carbon atoms, and X stands for a radical selected from the group consisting of X a, X b, X c and X d, X a stands for ---OR 4 where R 4 stands for a hydrogen or a hydrocarbon radical with 1 to 20 carbon atoms, optionally having at least one heteroatom, in particular oxygen in the form of ether, carbonyl or ester groups; X b stands for wherein R 5 stands for a hydrogen or a hydrocarbon radical with 1 to 20 carbon atoms, which optionally has at least one heteroatom in particular oxygen in the form of ether, carbonyl or ester groups; X c stands for wherein Y stands for O or S and R 6 and R 7 either together stand for a divalent radical having 2 to 10 carbon atoms, optionally having oxygen or sulfur atoms, this radical being part of optionally substituted five-, six- or seven-membered ring, or R 6 stands for an alkyl, cycloalkyl, arylalkyl or acyl radical with 1 to 10 carbon atoms and R 7 stands for a hydrogen or a monovalent radical with 1 to 20 carbon atoms, selected from the group consisting of an alkyl radical, cycloalkyl radical, arylalkyl radical, aryl radical, -OR 8, -SR 8 and -NR 8 R 9, where R 8 and R 9 either each stand for a hydrocarbon radical or together stand for an alkylene radical which is part of five-, six- or seven-membered ring; and Y stands for O or S and R 6 and R 7 either together stand for a divalent radical having 2 to 10 carbon atoms, optionally having oxygen or sulfur atoms, this radical being part of optionally substituted five-, six- or seven-membered ring, or R 6 stands for an alkyl, cycloalkyl, arylalkyl or acyl radical with 1 to 10 carbon atoms and R 7 stands for a hydrogen or a monovalent radical with 1 to 20 carbon atoms, selected from the group consisting of an alkyl radical, cycloalkyl radical, arylalkyl radical, aryl radical, -OR 8, -SR 8 and -NR 8 R 9, where R 8 and R 9 either each stand for a hydrocarbon radical or together stand for an alkylene radical which is part of five-, six- or seven-membered ring; and where R 8 and R 9 either each stand for a hydrocarbon radical or together stand for an alkylene radical which is part of five-, six- or seven-membered ring; and X d stands for a substituted or unsubstituted aryl radical.