Composition comprising at least one polyurethane polymer P which has cycloaliphatic isocyanate groups, prepared from at least one polyol and isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane (IPDI); and at least one cycloaliphatic dialdimine of the formula where R 1 and R 2 are each independently a monovalent hydrocarbon radical having 1 to 12 carbon atoms; or together are a divalent hydrocarbon radical which has 4 to 20 carbon atoms and is part of an optionally substituted carbocyclic ring having 5 to 8, preferably having 6, carbon atoms; R 3 is a hydrogen atom or an alkyl or arylalkyl group, especially having 1 to 12 carbon atoms; R 4 is a hydrocarbon radical which has 6 to 30 carbon atoms and optionally contains heteroatoms; or is a radical of the formula where R 5 is a linear or branched alkyl radical having 6 to 30 carbon atoms, optionally having cyclic components and optionally having at least one heteroatom, especially oxygen in the form of ether, ester or aldehyde groups; or is a mono- or polyunsaturated linear or branched hydrocarbon radical having 6 to 30 carbon atoms; or is an optionally substituted aromatic or heteroaromatic 5- or 6-membered ring; and A is the radical of 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane (IPDA), bis (4-aminocyclohexyl)methane (H 12 MDA), diaminocyclohexane or bis(4-amino-3-methylcyclohexyl)methane after removal of the two primary amino groups. where R 1 and R 2 are each independently a monovalent hydrocarbon radical having 1 to 12 carbon atoms; or together are a divalent hydrocarbon radical which has 4 to 20 carbon atoms and is part of an optionally substituted carbocyclic ring having 5 to 8, preferably having 6, carbon atoms; are each independently a monovalent hydrocarbon radical having 1 to 12 carbon atoms; or together are a divalent hydrocarbon radical which has 4 to 20 carbon atoms and is part of an optionally substituted carbocyclic ring having 5 to 8, preferably having 6, carbon atoms; R 3 is a hydrogen atom or an alkyl or arylalkyl group, especially having 1 to 12 carbon atoms; R 4 is a hydrocarbon radical which has 6 to 30 carbon atoms and optionally contains heteroatoms; or is a radical of the formula where R 5 is a linear or branched alkyl radical having 6 to 30 carbon atoms, optionally having cyclic components and optionally having at least one heteroatom, especially oxygen in the form of ether, ester or aldehyde groups; or is a mono- or polyunsaturated linear or branched hydrocarbon radical having 6 to 30 carbon atoms; or is an optionally substituted aromatic or heteroaromatic 5- or 6-membered ring; is a hydrocarbon radical which has 6 to 30 carbon atoms and optionally contains heteroatoms; or is a radical of the formula where R 5 is a linear or branched alkyl radical having 6 to 30 carbon atoms, optionally having cyclic components and optionally having at least one heteroatom, especially oxygen in the form of ether, ester or aldehyde groups; or is a mono- or polyunsaturated linear or branched hydrocarbon radical having 6 to 30 carbon atoms; or is an optionally substituted aromatic or heteroaromatic 5- or 6-membered ring; is a linear or branched alkyl radical having 6 to 30 carbon atoms, optionally having cyclic components and optionally having at least one heteroatom, especially oxygen in the form of ether, ester or aldehyde groups; or is a mono- or polyunsaturated linear or branched hydrocarbon radical having 6 to 30 carbon atoms; or is an optionally substituted aromatic or heteroaromatic 5- or 6-membered ring; and A is the radical of 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane (IPDA), bis (4-aminocyclohexyl)methane (H 12 MDA), diaminocyclohexane or bis(4-amino-3-methylcyclohexyl)methane after removal of the two primary amino groups.