Core Viewpoint - The article highlights the advancements in bio-based polycarbonate (PC) technology in China, particularly through a newly authorized patent by Sinopec, which signifies a significant step towards local commercialization of bio-based materials [2][8]. Group 1: Patent and Technology Development - On October 3, Sinopec received authorization for a patent titled "A Bio-based Polycarbonate and Its Preparation Method and Application," indicating progress in bio-based material innovation [2]. - The patented method utilizes isosorbide and diphenyl carbonate (DMC) as raw materials, incorporating cyclic dimer fatty acids to enhance the properties of the resulting bio-based PC, achieving a molecular weight of ≥35,000 and a glass transition temperature of ≤100℃ [3][6]. Group 2: Industrial Production and Market Potential - In early September, a subsidiary of Sinopec, Puyang Shengtong Juyuan New Materials Co., showcased China's first bio-based PC specialty engineering plastic product, with industrial production set to commence by February 2025 [4]. - The bio-based PC production process replaces the co-monomer bisphenol A with renewable isosorbide, achieving surface hardness close to glass and a light transmittance of up to 92%, indicating strong commercial viability [4]. Group 3: Competitive Landscape - Internationally, companies like Mitsubishi Chemical, Covestro, and Teijin are leading in bio-based PC products, with Covestro's bio-based Makrolon® containing 60% bio-based carbon content and Teijin planning to mass-produce 100% bio-based PC by 2025 [7]. - Mitsubishi Chemical has been producing bio-based materials since 2015, utilizing isosorbide in various automotive components, showcasing the competitive edge of international players in the bio-based PC market [7]. Group 4: Industry Challenges and Opportunities - The Chinese PC industry faces a challenge of "high-end shortage and low-end surplus," with 2024 production capacity projected at 3.81 million tons, accounting for 48% of global capacity, while 70% of high-end products are reliant on imports [7]. - The advancements by Sinopec and the local production efforts by Shengtong Juyuan represent critical steps in addressing these challenges and enhancing the domestic bio-based PC market [8].