| abstract |
PROBLEM TO BE SOLVED: To provide a method for stably producing high-quality aliphatic polyesters, which can control polymerization quickly and can carry out polymerization smoothly and constantly. SOLUTION: An aliphatic polyhydric alcohol or a mixture thereof and an aliphatic polybasic acid or a mixture thereof, or an oligomer or a polymer thereof, and / or a hydroxycarboxylic acid or a mixture thereof, or an oligomer or a polymer thereof are used. , Which undergo a dehydration condensation reaction in a reaction mixture containing an organic solvent, and have a weight average molecular weight of 15,000. In a method for producing an aliphatic polyester which is 0 or more, measurement is performed using a measuring device including a near-infrared spectrophotometer, The temperature, pressure, inert gas flow rate, moisture, concentration, reflux amount of organic solvent, reaction time, etc. of the reaction tank are controlled. |