Yi-Cheng Li

Title: **Innovative Contributions of Yi-Cheng Li in Polyphenylene Ether Technologies**

Introduction

Yi-Cheng Li is a notable inventor based in Taipei, Taiwan, recognized for his significant contributions to the field of polyphenylene ether technologies. With a total of four patents to his name, Li has developed innovative processes that enhance both safety and efficiency in the production and application of polyphenylene ether (PPE).

Latest Patents

Among Yi-Cheng Li's latest patents is a methodology titled "Process for Preparing Polyphenylene Ether Microspore Dispersion." This process entails dissolving a high-molecular polyphenylene ether in a first solvent at temperatures ranging from 45-110°C to create a dissolution liquid. By adding processing aids and mixing them thoroughly, the dissolution liquid is then cooled to 42-80°C, where a second solvent is introduced. As a result, PPE microspores are generated, wrapping around the processing aids. The final product, which is cooled to 0-40°C, produces PPE microspore dispersions suitable for impregnation processes performed below 40°C. This innovative process eliminates the necessity for high-temperature impregnation equipment and results in copper clad laminates with exceptional physical properties, including high glass transition temperature (Tg), low dielectric constant (Dk), low dielectric loss (Df), and enhanced peel strength of copper foil.

Li's second notable invention, "Process for Producing Polyphenylene Ether Helping to Improve Safety and Yield," focuses on optimizing production safety. This procedure maintains the combustible solvent at a gaseous concentration below its explosion threshold and manages oxygen levels to remain below the limiting oxygen concentration (LOC) of the solvent. By employing a rotary-sealed mixer with magnetic rotary feedthroughs to prevent the buildup of static electricity, Li's process effectively enhances both safety and yield during production.

Career Highlights

Throughout his career, Yi-Cheng Li has made significant impacts while working for prominent companies, including Dyaco International Inc. and Nan Ya Plastics Corporation. His expertise in polymer science and innovation management has facilitated advancements within these organizations, contributing to their standing in the industry.

Collaborations

Li's innovative journey has been enriched through collaborations with talented professionals such as Jung-Jen Chuang and Zhang-Jian Huang. Their combined expertise has led to the successful development and application of Li's pioneering technologies in polyphenylene ether.

Conclusion

With a keen focus on enhancing the safety and efficacy of polyphenylene ether usage, Yi-Cheng Li remains a pivotal figure in innovation. His patents not only showcase his inventive spirit but also significantly impact industries reliant on advanced polymer technology, reinforcing the importance of continuous research and development in the field.