| 摘要 |
<p>The invention concerns a method for producing dimeric cyclic esters starting with a raw esterification material obtained either from mixing lactic and/or glycolic acid with one of its esters or by extraction at a predetermined time of the esterification process. Said method comprises mild and selective dimerization of the ester, followed by mild and selective cyclization of the dimerised ester and finally purification of the resulting raw material.</p> |
