Polycarbonate (PC), as one of the five major engineering plastics, has excellent optical properties, including transparency, heat resistance, flame retardancy, and resistance to breakage. PC has been enhanced and modified to improve its flame retardancy, strength, impact resistance, toughness, and other properties, depending on the functional differences after modification. Modified PC is widely used as an intermediate product in the petrochemical industry chain, and is also used in household appliances, automotive industry, electronic communication, engineering machinery, etc. Its patents account for a large proportion in metallurgy, chemistry, operation, and transportation industries.