prov:value
| - In addition to the ??-hydroxybutyric acid units, the polyesters according to the invention preferably contain only co-condensed residues of polyols, i.e. of aliphatic, cycloaliphatic and/or araliphatic alcohols containing from 2 to 6 OH-groups bound to non-aromatic C-atoms and from 2 to 24 C-atoms per molecule, such as glycols, for example ethylene glycol, 1,2-propane diol, 1,3-propane diol, 1,2-b
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