Abstract: The present invention relates to a biodegradable polyester resin, in which the first repeat unit comprising a first diol residue and an aromatic dicarboxylic acid residue and the second repeat unit comprising a second diol residue and an aliphatic dicarboxylic acid residue satisfy a ratio of the number of repeat units in a specific range, and the softness index of the resin satisfies a specific range, and to a process for preparing the same. Since the biodegradable polyester resin can provide a biodegradable polyester sheet or film that can be simultaneously enhanced in productivity, processability, and moldability and is excellent in tensile strength, tear strength, and friction coefficient and excellent in biodegradability and water degradability, it can be utilized in more diverse fields.
Type:
Grant
Filed:
April 24, 2023
Date of Patent:
March 19, 2024
Assignee:
Ecovance Co. Ltd.
Inventors:
Kyung Youn Kim, Hoon Kim, Seong Dong Kim, Ji Yeon Ryu, Hyung Mo Kim
Abstract: An eco-friendly biodegradable molded article, which includes a polyester resin including a diol, an aromatic dicarboxylic acid and an aliphatic dicarboxylic acid, wherein a biodegradability per hydrolysis degree of the biodegradable molded article 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 biodegradability after nine weeks and the hydrolysis degree after one week are measured by a measurement method below.
Type:
Grant
Filed:
May 19, 2023
Date of Patent:
February 13, 2024
Assignee:
Ecovance Co. Ltd.
Inventors:
Kyung Youn Kim, Seong Dong Kim, Hoon Kim, Jun Su Byeon
Abstract: An eco-friendly biodegradable polyester resin composition includes: a polyester resin including a diol, an aromatic dicarboxylic acid and an aliphatic dicarboxylic acid; and 5000 ppm to 20000 ppm of a hydrophilic regulator having a molecular weight of 400 to 1300.
Type:
Grant
Filed:
May 19, 2023
Date of Patent:
February 13, 2024
Assignee:
Ecovance Co. Ltd.
Inventors:
Kyung Youn Kim, Seong Dong Kim, Hoon Kim, Jun Su Byeon, Joo Young Jung, Ji Yeon Ryu
Abstract: The present invention relates to a biodegradable polyester resin, in which the first repeat unit comprising a first diol residue and an aromatic dicarboxylic acid residue and the second repeat unit comprising a second diol residue and an aliphatic dicarboxylic acid residue satisfy a ratio of the number of repeat units in a specific range, and the softness index of the resin satisfies a specific range, and to a process for preparing the same. Since the biodegradable polyester resin can provide a biodegradable polyester sheet or film that can be simultaneously enhanced in productivity, processability, and moldability and is excellent in tensile strength, tear strength, and friction coefficient and excellent in biodegradability and water degradability, it can be utilized in more diverse fields.
Type:
Grant
Filed:
May 25, 2022
Date of Patent:
June 6, 2023
Assignee:
ECOVANCE CO. LTD.
Inventors:
Kyung Youn Kim, Hoon Kim, Seong Dong Kim, Ji Yeon Ryu, Hyung Mo Kim