METHOD FOR CONTINUOUS PRODUCTION OF BIODEGRADABLE ALIPHATIC/AROMATIC POLYESTER COPOLYMER

• Main Authors: KIM, SANG YOB, BYUN, KIL SEUK, KANG, GYUNG DON, KIM, SEI HOON, KIM, BOO SEONG, PARK, SUNG BAE, YUN, KI CHULL, RYUM, JUNG
• Format: Patent
• Language: English; Korean
• Published: 20.06.2014
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

Provided is a method for the continuous production of biodegradable aliphatic/aromatic polyester copolymer, the method comprising the steps of: making an aliphatic dihydroxy compound react with an aliphatic dicarboxylic acid at 185°C or lower in a primary ester reaction; continuously making the product obtained from the previous step react in a secondary ester reaction; making the product obtain from the previous step react in a continuous primary polycondensation reaction and obtaining a preliminary polymer; making the preliminary polymer react in a continuous secondary polycondensation reaction and obtaining a secondary polycondensation product having an intrinsic viscosity of 0.9-1.0 dl/g; and making the product obtained from the previous step react in a continuous tertiary polycondensation reaction. The biodegradable aliphatic/aromatic polyester copolymer is produced by adding an aromatic dicarboxylic acid in the step for the first ester reaction or in the step for the continuous second ester reaction. By controlling the intrinsic viscosity of the product obtained from the secondary polycondensation reaction, the method for the continuous production of biodegradable aliphatic/aromatic polyester copolymer as described above can obtain a biodegradable aliphatic/aromatic polyester copolymer having superb processability, capability for film formation, tensile and tear strengths, and blending capability with other polymer resin, and additionally, reduces the quantity consumed of the aliphatic dihydroxy compound, which is a starting material, thereby reducing per unit production costs.