According to the financial news on April 5, 2025, the information from the State Intellectual Property Office shows that BYD Co., Ltd. has applied for a patent named "Polyurethane and its preparation method, composite material for polishing and its preparation method, polishing pad", with publication number CN 119751792 A and application date of October 2024.
The patent abstract shows that the embodiments of this application provide polyurethane and its preparation method, composite material for polishing and its preparation method, and polishing pad. The polyurethane provided in the embodiment of this application is prepared by diisocyanate and polyether polyol, and the polyether polyol includes a polyether polyol with a number average molecular weight of ≤500g/mol; the number average molecular weight of the polyurethane is ≥18000g/mol, and the molecular weight distribution index of the polyurethane is 1-3. The polyurethane provided in the embodiment of this application has both high hardness and certain elasticity, and can be used to provide a composite material for polishing with high hardness, good compression performance and high uniformity.