Invention Publication
- Patent Title: High-Viscosity Biodegradable Aliphatic-Aromatic Polyester Copolymer Having Excellent Hydrolysis Resistance and Method of Preparing the Same
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Application No.: US18448370Application Date: 2023-08-11
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Publication No.: US20240174795A1Publication Date: 2024-05-30
- Inventor: Do Young Kim , Hyun Sik Yang , Yu Hyun Kim , Ki Yup Kim , Joo Hyun Nam , Chul Soon Moon , Ji Hae Park , Sung Won Lee , Jun Haeng Lee , Ho Seung Lee
- Applicant: SK Innovation Co., Ltd. , SK Geo Centric Co., Ltd. , Kolon Industries, Inc.
- Applicant Address: KR Seoul
- Assignee: SK Innovation Co., Ltd.,SK Geo Centric Co., Ltd.,Kolon Industries, Inc.
- Current Assignee: SK Innovation Co., Ltd.,SK Geo Centric Co., Ltd.,Kolon Industries, Inc.
- Current Assignee Address: KR Seoul
- Priority: KR 20220164742 2022.11.30
- Main IPC: C08G63/183
- IPC: C08G63/183 ; C08G63/52 ; C08G63/78

Abstract:
Provided are a biodegradable aliphatic-aromatic polyester copolymer having excellent hydrolysis resistance and high viscosity which has a carboxyl end group (CEG) content of 15 mg KOH/g or less, a ratio (Mz/Mn) of a z-average molecular weight (Mz) to a number average molecular weight (Mn) of 3 to 15, and a melt index (MI) of 5 g/10 min or less as measured under conditions of a temperature of 190° C. and a load of 2.16 kg in accordance with ASTM D 1238. A method of preparing a biodegradable aliphatic-aromatic polyester copolymer is provided, including adding a chain extender and an anti-hydrolysis agent to an aliphatic-aromatic polyester pre-copolymer over time, whereby a significant viscosity rise and improvement of hydrolysis resistance may be implemented simultaneously.
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