Patent ID: 11898004
Assignee: ECOVANCE CO. LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 3:
4. 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.