Maleic Resins

Under the brand name Erkamar, Robert Kraemer GmbH & Co. KG sells a variety of maleic resins. These are the Diels-Alder adducts of levopimaric acid from rosin with maleic acid or fumaric acid, which are still esterified in whole or in part with polyhydric alcohols. Maleic resins have different melting points and solubilities depending on their functionality. They are used as binders in solvent-based applications and, after neutralization, in aqueous applications. Maleic resins are hard, oxidation-stable resins and improve wetting, adhesion and gloss. Alcohol- and ester-soluble maleic resins are used in flexographic inks, NC coatings, inks and jet inks. As hard resins in oil-based coatings and alkyd resin systems, the gasoline-soluble maleic resins additionally improve scratch resistance. Oxidation-stable, water-soluble maleic resins are successfully used in pigment production to coat the pigment surface and increase color strength in particular.