Patent ID: 7541422

Claim:
A process for the production of cyclic ester oligomers, comprising the step of reacting in a solvent components comprising: (a) a first component selected from one or more of: (i) at least one dicarboxylic acid and/or dicarboxylic acid derivative and at least one diol, (ii) at least one hydroxycarboxylic acid and/or hydroxycarboxylic acid ester, and (iii) at least one linear ester oligomer; and (b) a second component comprising at least one enzyme capable of catalyzing transesterification of esters, esterification of carboxylic acids, and/or hydrolysis of esters; wherein the solvent comprises about 30 to about 70 weight percent of at least one tertiary alcohol and about 30 to about 70 weight percent of at least one non-alcoholic solvent, wherein the weight percentages are based on the total weight of the solvent.