High strength ultra-thin biodegradable film and preparation method thereof

US12404365B2 · kind B2 · utility

Assignees

• CHINA PETROLEUM & CHEMICAL CORPORATION · CN
• BEIJING RESEARCH INSTITUTE OF CHEMICAL INDUSTRY, CHINA PETROLEUM & CHEMICAL CORPORATION · CN

Inventors

• Guixiang Zhu · Beijing, CN
• Taoyi ZHANG · Beijing, CN
• Mingfu Lyu · Beijing, CN
• Cui Zheng · Beijing, CN
• Wei Zhang · Lianyungang, CN
• Ling Han · Beijing, CN
• Wenxi Ji · Beijing, CN
• Ning XU · Beijing, CN
• Peng Guo · Natick, US

Key dates

• Filing date: Sep 17, 2020
• Grant date: Sep 2, 2025
• Expiry date: Nov 2, 2042

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02A40/28
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A biodegradable film is prepared from a composition that includes a copolyester obtained by extrusion reaction of a branched aliphatic-aromatic copolyester derived from monomer a, monomer b, monomer c and monomer d with an organic peroxide. The film can be completely degraded into small molecular products such as carbon dioxide, water and the like under natural or composting conditions. Moreover, the film can be prepared having a thickness of 4-50 μm as required, and its mechanical properties can reach the same level as or even better than those of LDPE film.