Process for producing an article made of a build material, wherein the build material comprises free-radically crosslinkable groups, NCO groups and groups having Zerewitinoff-active H atoms and the article is a three-dimensional article and/or a layer, characterized in that during and/or after production of the article the build material is heated to a temperature of ≥ 50°C and in that the build material comprises one or more cyclic tin compounds of formula F-I, F-II and/or F-III: wherein: D represents -O-, -S- or -N - wherein R1 represents a saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic radical or an optionally substituted aromatic or araliphatic radical which has up to 20 carbon atoms and may optionally contain heteroatoms from the group of oxygen, sulfur, nitrogen, or is hydrogen or the radical or R1 and L3 together represent -Z-L5-; D* represents -O- or -S-; X, Y and Z represent identical or different radicals selected from alkylene radicals of formulae -C -, -C -C - or -C -C -C - or ortho-arylene radicals of formulae or wherein R2 to R11 independently represent saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals which have up to 20 carbon atoms and may optionally contain heteroatoms from the group of oxygen, sulfur, nitrogen, or are hydrogen; L1, L2 and L5 independently represent -O-, -S-, -OC(=O)--OC(=S)-, -SC(=O)-, -SC(=S)-, -OS(=O) 2 O-, -OS(=O) 2 - or -N -, wherein R12 represents a saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic radical or an optionally substituted aromatic or araliphatic radical which has up to 20 carbon atoms and may optionally contain heteroatoms from the group of oxygen, sulfur, nitrogen, or is hydrogen; L3 and L4 independently represent -OH, -SH, -OR13, -Hal, -OC(=O)R14, -SR15, -OC(=S)R16, -OS(=O) 2 OR17, -OS(=O) 2 R18 or -NR19R20, or L3 and L4 together represent -L1-X-D-Y-L2-, wherein R13 to R20 independently represent saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals which have up to 20 carbon atoms and may optionally contain heteroatoms from the group of oxygen, sulfur, nitrogen, or are hydrogen. D represents -O-, -S- or -N - wherein R1 represents a saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic radical or an optionally substituted aromatic or araliphatic radical which has up to 20 carbon atoms and may optionally contain heteroatoms from the group of oxygen, sulfur, nitrogen, or is hydrogen or the radical or R1 and L3 together represent -Z-L5-; D* represents -O- or -S-; X, Y and Z represent identical or different radicals selected from alkylene radicals of formulae -C -, -C -C - or -C -C -C - or ortho-arylene radicals of formulae or wherein R2 to R11 independently represent saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals which have up to 20 carbon atoms and may optionally contain heteroatoms from the group of oxygen, sulfur, nitrogen, or are hydrogen; L1, L2 and L5 independently represent -O-, -S-, -OC(=O)--OC(=S)-, -SC(=O)-, -SC(=S)-, -OS(=O) 2 O-, -OS(=O) 2 - or -N -, wherein R12 represents a saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic radical or an optionally substituted aromatic or araliphatic radical which has up to 20 carbon atoms and may optionally contain heteroatoms from the group of oxygen, sulfur, nitrogen, or is hydrogen; L3 and L4 independently represent -OH, -SH, -OR13, -Hal, -OC(=O)R14, -SR15, -OC(=S)R16, -OS(=O) 2 OR17, -OS(=O) 2 R18 or -NR19R20, or L3 and L4 together represent -L1-X-D-Y-L2-, wherein R13 to R20 independently represent saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals which have up to 20 carbon atoms and may optionally contain heteroatoms from the group of oxygen, sulfur, nitrogen, or are hydrogen.