abstract |
(57) [Problem] To provide a method for producing a hydroxycarboxylic acid having a controlled molecular weight. SOLUTION: A hydroxycarboxylic acid and / or an oligomer thereof is selected from monocarboxylic acids, dicarboxylic acids, monoalcohols and diols. A method for producing a polyhydroxycarboxylic acid having a controlled molecular weight, comprising mixing at least one kind or two or more kinds of molecular weight regulators in an arbitrary ratio, and allowing a haloiminium salt and a base to act thereon. |