万润股份：积极布局热塑性聚酰亚胺材料领域，包括PEI、TPI、PI-5218，上述产品均已实现销售

Group 1 - The company has achieved mass production of polyimide materials in the electronic and display fields, with products already in bulk supply [2] - The company's subsidiary, March Technology, has successfully supplied TFT polyimide materials (orientation agents) and photosensitive polyimide (PSPI) materials for OLED applications to downstream panel manufacturers [2] - The company is actively expanding into the thermoplastic polyimide materials sector, including PEI, TPI, and PI-5218, all of which have already been sold [2]