Tackifiers, medical or tackifiers industrial, medical or tacky adhesive for industrial, medical or tacky adhesive sheet for industrial and adhesive tapes for medical or industrial,

Well compatible with the synthetic rubber elastomer, that the melt viscosity can be lowered, it is possible to impart excellent tacky adhesive properties, to provide a tackifier resin ester. As a tackifier, and the content of the resin acid ester represented by the general formula (1) is 70 wt% or more [Formula 1]