| abstract |
A method for producing L,L-, D,D-, D,L- or meso-dilactide, comprising polycondensation and/or polytransesteriication of L-, D- or D,L-lactic acid or esters thereof to form high-molecular-weight polyesters of L-, D- or D,L-lactic acid (polylactic acids), and cyclodepolymerisation of the polylactic acids to form dilactides, wherein the high-molecular-weight polyesters of the L-, D- or D,L-lactic acid can be produced in the presence of hydrolysis-stable metal compounds acting as a catalyst. |