The new polymer quaternary ammonium salt was synthesized from epoxy phenolic resin via ring-opening reaction with aqueous solution of triethylamine hydrochloride.

A cashew shell oil modified epoxy phenolic paint has been developed, which can be applied on the untreated polypropylene surface with good adhesion, high hardness, fast curing and glass.

On the other hand, some thermosetting resins generally did not melt or melted slightly, such as phenolic resin and epoxy resin.