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On January 15, Dai Nippon Seiyaku released a statement announcing that Horikoshi Plastics would be split off and the company’s name would be changed. Dai Nippon Seiyaku will acquire and merge Boron Plastic’s engineering plastics business, while Boron Plastic will be renamed HPP Holdings Co., Ltd. On October 16, 2025, Dalian Kailu and its wholly-owned subsidiary Boli Plastics announced a restructuring plan based on the \"acquisition and separation\" model. Boros Plastics will be split into two main segments: one is the engineering plastics business (covering the entire value chain from research and development to production and sales, as well as related supporting services), and the other is the business of holding and managing shares in Boros Plastics’ subsidiaries. In April 1, 2026, Dainippon Celanese will merge the engineering plastics business of Boron Plastic and operate it as the \"High-Performance Polymers Division\". Following the spin-off, Boride Plastics will continue to act as the holding company managing its subsidiaries, and will be renamed HPP Holdings Co., Ltd. starting from April 1, 2026. According to available information, Boron Plastic, a world-renowned company in the field of engineering plastics, was established in 1964 through a joint venture between Dai Nippon Printing and the American chemical giant Celanese; Celanese held 45% of the shares while Dai Nippon Printing held 55%. In 2020, based on its medium-term strategy \"Accelerate 2025\", Dai Nippon Printing & Packaging acquired the shares in Boron Plastic held by Celanese for $1.575 billion, making it its wholly-owned subsidiary. Dai Sai Lu stated that this restructuring facilitates the sharing of the proprietary knowledge held by both parties in the field of engineering plastic technology services and solutions, strengthens the connection between Dai Sai Lu’s safety-related business and its materials business, optimizes talent development and utilization, and improves efficiency in order to maximize corporate value.