C9petroleumresinisakindofthermalplasticizingresinproducedbyC9fraction,by-productsofpetroleumcracking,throughpretreat-ment,polymerizationanddistillation.Feataredbyacidvalue,easymutualsolubilities,resistanttowater,resistanttoethanolandhasthechemicalstabilizingpropertytoacidandalkaline,viscosityadjustingandthermalstabilizing.Generally,thepetroleumresinsarenotusedindependently,buth***etobeusedtogetherwithotherkindsofresinsaspromoters,adjustingagentsandmodifiers.)