C5 petroleum resins are polymers produced with byproduct cracked C5 cuts in ethylene production as raw materials through separation and polymerization. They can be used as additives for adhesives, inks, rubber anchoring agents, paper sizing agents and various coatings. With the improvement of production technologies, the development of new varieties, the expansion of application sectors and the increase of market demand, petroleum resins in China have entered a stage of rapid development and the average annual growth has reached 12% in recent years.