... 9-11& 18,softening point 90--140 deg.C Petroleum resin is a kind of thermal plasticizing resin produced by ... C5, C9 fraction, by-products of petroleum cracking, through pretreatment, polymerization and distillation. It isn't a ... acid and alkaline, viscosity adjusting and thermal stabilizing, Generally, the petroleum resins are not used independently, but have to be used ...