A process for the continuous production of biodegradable aliphatic / aromatic polyester copolymer

Continuous production process of a biodegradable aliphatic / aromatic polyester copolymer, the method comprising: performing a first esterification reaction of an aliphatic dihydroxy compound with an aliphatic dicarboxylic acid at a temperature of 185 ° C or less; continuously performing a second esterification reaction of a reaction product from the first esterification reaction; continuously performing a first polycondensation reaction of a reaction product of the second esterification reaction to obtain a prepolymer having a weight average molecular weight of about 6,900 to about 14,000; continuously performing a second polycondensation reaction of the prepolymer to obtain a second polycondensation reaction product; and continuously performing a third polycondensation reaction of the second polycondensation reaction to produce the biodegradable aliphatic / aromatic polyester copolymer, wherein performing the first esterification reaction, or continuously performing the second esterification reaction comprises adding an aromatic carboxylic acid. The biodegradable aliphatic / aromatic polyester copolymer which is produced by the continuous process, can be improved with another polymer resin in the processability, film formability, tensile / tear resistance, and miscibility. The use of a lesser amount of the aliphatic dihydroxy compound as a starting material can reduce the manufacturing cost.