Biodegradable molded article and biodegradable polyester resin composition

A biodegradable polyester resin composition, comprising:

• a polyester resin comprising a diol, an aromatic dicarboxylic acid and an aliphatic dicarboxylic acid,
• wherein a biodegradability per hydrolysis degree of the biodegradable polyester resin composition is 1.35 or more,
• wherein the biodegradability per hydrolysis degree is obtained by dividing a biodegradability after nine weeks by a hydrolysis degree after one week,
• wherein the diol includes 1,4-butandiol in a content of about 98 mol % or more based on the total diol,
• wherein the aromatic dicarboxylic acid includes terephthalic acid or dimethyl terephthalate in a content of about 43 mol % to about 53 mol % based on the total dicarboxylic acid,
• wherein the aliphatic dicarboxylic acid includes adipic acid, in a content of about 47 mol % to about 57 mol % based on the total dicarboxylic acid,
• wherein the biodegradability after nine weeks and the hydrolysis degree after one week are measured by the measurement method below:
• in the measurement method, the biodegradability after nine weeks is a molecular weight reduction rate, compared to an initial molecular weight of the biodegradable polyester resin composition, of the biodegradable polyester resin composition processed into flakes having a thickness of 300 μm and a size of 30 mm×30 mm and placed at 60° C. and a relative humidity of 90% for 63 days under composting conditions, and
• the hydrolysis degree after one week is a molecular weight reduction rate, compared to an initial molecular weight of the biodegradable polyester resin composition, of the flakes placed at 80° C. and a relative humidity of 100% for 7 days.

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

• wherein a biodegradability per aliphatic carboxylic acid of the biodegradable polyester resin composition is 1.7 or more,
• wherein the biodegradability per aliphatic carboxylic acid is obtained by dividing a biodegradability after nine weeks by a ratio the aliphatic dicarboxylic acid to a total of dicarboxylic acids,
• wherein the diol includes 1,4-butandiol in a content of about 98 mol % or more based on the total diol,
• wherein the aromatic dicarboxylic acid includes terephthalic acid or dimethyl terephthalate in a content of about 43 mol % to about 53 mol % based on the total dicarboxylic acid,
• wherein the aliphatic dicarboxylic acid includes adipic acid, in a content of about 47 mol % to about 57 mol % based on the total dicarboxylic acid,
• wherein the biodegradability after nine weeks is 85% or more, and the biodegradability after nine weeks is measured by the measurement method below:
• in the measurement method, the biodegradability after nine weeks is a molecular weight reduction rate, compared to a molecular weight of the biodegradable polyester resin composition, the biodegradable polyester resin composition placed at 60° C. and a relative humidity of 90% for 9 weeks under composting conditions.