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Rosin modified Maleic Anhydride Resin is the slight yellow transparent solid, which is adducts of gum rosin and maleic anhydride through the esterification by glycerol or pentaerythritol. Soluble in coal tars, esters, turpentine oil; insoluble in alcoholic solvents; partially soluble in petroleum solvents, soluble well in plant oils. Which with the advantages of stable color, resistant to yellowing, good heat resistant and adhesion. They are used in paint and coating industries widely, for production of phenolic paints (through polymerization with plant oils); improve hardness of paint films, gloss and rubbing property for polyesters, Nitro and PU paints.