Biodegradable polyester resin composition and biodegradable polyester molded article including the same

A biodegradable polyester resin composition, comprising a polyester resin comprising a diol, an aromatic dicarboxylic acid and an aliphatic dicarboxylic acid,

• a hydrolysis degree after one week is 35% to 60%, and
• a hydrolysis degree after three weeks is 85% or more,
• wherein the hydrolysis degree after one week and the hydrolysis degree after three weeks are measured by a measurement method below:
• wherein in the measurement method
• the hydrolysis degree after one week is a number average molecular weight reduction rate, compared to an initial number average molecular weight of the biodegradable polyester resin composition, of the biodegradable polyester resin composition placed for one week under high-temperature and high-humidity conditions of 80° C. and a relative humidity of 100%, and
• the hydrolysis degree after three weeks is a number average molecular weight reduction rate, compared to an initial number average molecular weight of the biodegradable polyester resin composition, of the biodegradable polyester resin composition placed for three weeks under high-temperature and high-humidity conditions of 80° C. and a relative humidity of 100%.

A biodegradable molded article, comprising a biodegradable resin composition,

• wherein the biodegradable resin composition comprises a polyester resin comprising a diol, an aromatic dicarboxylic acid and an aliphatic dicarboxylic acid;
• and a hydrophilic regulator,
• wherein a content of the hydrophilic regular ranges from 5000 ppm to 20000 ppm based on a total amount of the biodegradable polyester resin composition, and
• wherein the hydrophilic regulator has a molecular weight of 400 to 1300
• wherein the hydrophilic regulator comprises:
• a first oligomer having a molecular weight ranging from 415 to 425;
• a second oligomer having a molecular weight ranging from 620 to 630;
• a third oligomer having a molecular weight ranging from 640 to 650;
• and
• a fourth oligomer having a molecular weight ranging from 840 to 850.