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

Claim 12:
13. 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.