1. Product c9 hydrocarbon a variety of substance identified as resin resin produced by c9 fraction, By polymerization through pretreatment, And distillation, Products of petroleum cracking. It isn t a high polymer but a low polymer with the molecular weight between 300, 3000. Featared by easy mutual, Acid value solubilities, Resistant resistant to, To water ethanol and substances. It contains the chemical stabilizing property to acid viscosity adjusting, And alkaline and thermal stabilizing, Generally, The resins are not used independently, But have for utilization together with other kinds of resins adjusting agents, As promoters and modifiers. Application a. Paints paints mainly use c9 hydrocarbon resin with high softening points, C9 hydrocarbon resin added to paints can increase the final finishes the adhesiveness, Of paints of paint films and the hardness. Resistance to acid and alkaline.