Process for preparing polyurethanes containing silane groups, by reacting at least A) a composition containing a) compounds of the general formula containing one or more isocyanate and silane groups and b) ≤ 1% by weight, based on the total mass of composition A), of one or more monomeric diisocyanates having aliphatically, cycloaliphatically, araliphatically and/or aromatically bonded isocyanate groups of the general formula OCN-Y-NCO where R 1, R 2 and R 3 are identical or different radicals and each is a saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic radical or an optionally substituted aromatic or araliphatic radical having up to 18 carbon atoms, which may optionally contain up to 3 heteroatoms from the group of oxygen, sulfur, nitrogen, X is a linear or branched organic radical having at least 2 carbon atoms and Y is a linear or branched, aliphatic or cycloaliphatic radical having 4 to 18 carbon atoms or an optionally substituted aromatic or araliphatic radical having 6 to 18 carbon atoms, with B) an at least difunctional polyol having a number-average molecular weight M n of 62 to 22 000 g/mol, preferably 90 to 12 000 g/mol, while maintaining a ratio of equivalents of isocyanate groups to hydroxyl groups of 0.7:1 to 1.2:1. A) a composition containing a) compounds of the general formula containing one or more isocyanate and silane groups and b) ≤ 1% by weight, based on the total mass of composition A), of one or more monomeric diisocyanates having aliphatically, cycloaliphatically, araliphatically and/or aromatically bonded isocyanate groups of the general formula OCN-Y-NCO where R 1, R 2 and R 3 are identical or different radicals and each is a saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic radical or an optionally substituted aromatic or araliphatic radical having up to 18 carbon atoms, which may optionally contain up to 3 heteroatoms from the group of oxygen, sulfur, nitrogen, X is a linear or branched organic radical having at least 2 carbon atoms and Y is a linear or branched, aliphatic or cycloaliphatic radical having 4 to 18 carbon atoms or an optionally substituted aromatic or araliphatic radical having 6 to 18 carbon atoms, with a) compounds of the general formula containing one or more isocyanate and silane groups and b) ≤ 1% by weight, based on the total mass of composition A), of one or more monomeric diisocyanates having aliphatically, cycloaliphatically, araliphatically and/or aromatically bonded isocyanate groups of the general formula OCN-Y-NCO R 1, R 2 and R 3 are identical or different radicals and each is a saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic radical or an optionally substituted aromatic or araliphatic radical having up to 18 carbon atoms, which may optionally contain up to 3 heteroatoms from the group of oxygen, sulfur, nitrogen, X is a linear or branched organic radical having at least 2 carbon atoms and Y is a linear or branched, aliphatic or cycloaliphatic radical having 4 to 18 carbon atoms or an optionally substituted aromatic or araliphatic radical having 6 to 18 carbon atoms, B) an at least difunctional polyol having a number-average molecular weight M n of 62 to 22 000 g/mol, preferably 90 to 12 000 g/mol,