Abstract: An hydroxyalkyl- and alkoxyalkyl-triazolidine-3,5-dione is disclosed of the formula ##STR1## wherein R.sup.1 represents an unsubstituted or substituted aliphatic radical, which is straight-chain or branched, with 1-20 C atoms, mono- or poly-cycloaliphatic radical with 5 to 21 C atoms, araliphatic radical with 7 to 17 C atoms or aromatic radical with 6 to 20 C atoms, each radical carrying m of the radicals shown in brackets, and it being possible for the aliphatic radicals to be interrupted by one or more oxygen atoms or tertiary nitrogen atoms and for the cycloaliphatic, araliphatic and aromatic radicals to be interrupted by one or more oxygen atoms, tertiary nitrogen atoms or methylene groups with 1 to 4 C atoms,R.sup.2 and R.sup.3 independently of one another denote hydrogen or a straight-chain or branched aliphatic radical with 1 to 10 C atoms,R.sup.