Polycarbonate (PC for short) is a molecular chain polymers containing carbonate, according to ester's structure can be divided into aliphatic, aromatic, aliphatic-aromatic and other types. As aliphatic and aliphatic-aromatic polycarbonate of lower mechanical properties, which limits their application in engineering plastics. Only aromatic polycarbonate was industrial production. Because of the particularity of polycarbonate structure, has become of general engineering plastics in the five fastest-growing.