<p>Biodegradable polyesters are based on: (A) 95 to 99.99 mol % of at least one polyester which contains as monomer constituents: (al) a mixture of (a11) 20 to 95 mol % of at least one aliphatic or cycloaliphatic dicarboxylic acid and (a 12) 5 to 80 mol % of at least one aromatic dicarboxylic acid; and (a2) at least one dihydroxy compound; and (B ) 0.01 to 5 mol % of a mixture which contains mononuclear and polynuclear isocyanurates.</p>
