Company Filing History:
1 out of 1 
1 out of 3 Years Active: 1992-2019
Title: Innovations of Mengxian Ding in Polyimide and Biphenyltetracarboxylic Acid
Introduction
Mengxian Ding is a notable inventor based in Changchun, China. He has made significant contributions to the field of chemistry, particularly in the preparation methods of polyimide and biphenyltetracarboxylic acid. With a total of 2 patents, his work has implications for various industrial applications.
Latest Patents
One of Mengxian Ding's latest patents is a preparation method of polyimide. This invention involves a dehydration polymerization reaction on a diamine and an anhydride of an organic acid in a non-polar solvent. The process allows for the direct production of polyimide powder with fine particles, eliminating the need for complex washing and grinding processes. This innovation not only shortens the production period but also reduces costs and facilitates large-scale production.
Another significant patent is the process for the preparation of 3,3',4,4'-biphenyltetracarboxylic acid. This method involves the coupling reaction of 4-halogen substituted o-benzenedicarboxylic acid ester in an aprotic polar solvent, utilizing a nickel chloride catalyst and zinc powder as a reducing agent. The resulting biphenyl tetracarboxylic acid esters can be further processed to obtain the corresponding acid and biphenyl dianhydride.
Career Highlights
Mengxian Ding has worked with prominent companies such as Changchun Hipolyking Co., Ltd. and the Changchun Institute of Applied Chemistry. His experience in these organizations has contributed to his expertise in chemical innovations and patent development.
Collaborations
Throughout his career, Mengxian Ding has collaborated with notable coworkers, including Xin Zhang and Jibin Zhong. These partnerships have likely enhanced his research and development efforts in the field of chemistry.
Conclusion
Mengxian Ding's contributions to the preparation methods of polyimide and biphenyltetracarboxylic acid showcase his innovative spirit and dedication to advancing chemical processes. His patents reflect a commitment to improving production efficiency and reducing costs in the industry.
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