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To 160 g of 85% aqueous lactic acid solution was added 38 g of glycolic acid and the mixture was heated in a nitrogen atmosphere under reduced pressure for 6 hours in a manner such that the inside temperature and pressure were initially 105° C. and 350 mmHg, respectively, and finally 150° C. and 30 mmHg, respectively, while removing the water distilled. Heating under reduced pressure was further conducted at 3-5 mmHg and 175° C. for 36 hours. Upon cooling to room temperature, there was obtained a colorless lactic acid-glycolic acid copolymer.

1. temperaturethe mixture was heated in a nitrogen atmosphere under reduced pressure for 6 hours in a manner such that the inside temperature and pressure
2. customwere initially 105° C.
3. custom350 mmHg, respectively, and finally 150° C. and 30 mmHg, respectively, while removing the water
4. distillationdistilled
5. temperatureHeating under reduced pressure