Sou Hu Cai Jing·2025-07-08 06:56Group 1 - China Petroleum & Chemical Corporation (Sinopec) has applied for a patent for a method to prepare colorless polyimide films, indicating a focus on advanced material development [1] - The patent application was filed on January 2024, with the publication number CN120271862A, showcasing the company's commitment to innovation in polymer technology [1] - The preparation method involves obtaining flexible and rigid polyamide acid solutions, followed by a series of processing steps to create the polyimide film, which enhances the performance of transparent polyimide films [1] Group 2 - Sinopec was established in 2000 and is primarily engaged in oil and gas extraction, with a registered capital of approximately 12.17 billion RMB [2] - The company has invested in 263 enterprises and participated in 5,000 bidding projects, demonstrating its extensive operational footprint [2] - Sinopec Shanghai Petrochemical Research Institute, founded in 2022, focuses on technology promotion and application services, with a registered capital of 498 million RMB and involvement in 350 bidding projects [2]