Rosin esterificated resin MRP-115 Pentaerythritol ester of maleic rosin Guilin Chemical Factory Natural Resins & Gum >> Rosin Coatings Inks Pentaerythritol ester of maleic rosin. Used in paints, varnishes and inks. Pentaerythritol ester of maleic rosin. Used in paints, varnishes and inks.