Core Viewpoint - Zhengdan Co., Ltd. is actively engaged in research and development in the field of high-performance materials, particularly focusing on polyimide and its key raw materials, including pyromellitic dianhydride [1] Group 1 - The company is monitoring technological trends in high-performance materials [1] - Ongoing R&D efforts are being made for key raw materials related to polyimide [1] - Future updates on R&D progress will be disclosed in periodic reports [1]