HYPC(SZ:000703) Jin Rong Jie·2025-08-07 02:08Group 1 - Zhejiang Hengyi Petrochemical Research Institute Co., Ltd. applied for a patent titled "A Preparation Method for Halogen-Free and Antimony-Free Flame Retardant Polyester," with publication number CN120424322A, and the application date is March 2025 [1] - The patent involves a preparation method for halogen-free and antimony-free flame retardant polyester, which includes grinding magnesium compound catalyst, dispersing it in ethylene glycol, and mixing it with dicarboxylic acid and diol for esterification [1] - The invention utilizes a titanium-based catalyst combined with magnesium compound as a catalyst to address the yellowing issue caused by titanium-based catalysts while ensuring environmental safety by eliminating antimony [1] Group 2 - Zhejiang Hengyi Petrochemical Research Institute Co., Ltd. was established in 2018 and is located in Hangzhou, primarily engaged in the chemical fiber manufacturing industry [2] - The company has a registered capital of 25 million RMB and has invested in 7 enterprises, participated in 9 bidding projects, and holds 472 patent information [2] - The company also possesses 9 trademark information and has 9 administrative licenses [2]