HIGH-MOLECULAR WEIGHT COPOLYESTERS. MEDIUM-MOLECULAR WEIGHT COPOLYESTERS.
SATURATED POLYESTER RESINS FOR STOVING ENAMELS
By developing saturated polyesters, Evonik has played an important role in influencing and extending the possible
applications of precoated metals. These coating raw materials are suitable for the production of coatings with very good adhesion offering an optimum of flexibility and formability together with an excellent surface hardness. For this reason, lacquers based on DYNAPOL® have proved particularly suitable for stampable and deep drawable coatings. A wide range of products is available for various requirements of the paint and coating industry. DYNAPOL® polyester resins are mainly used for stoving enamels in combination with amino resins. Special properties, such as chemical resistance, weathering resistance and flexibility, can be improved by using blocked polyisocyanate resins. Stoving enamels based on highmolecular weight copolyesters show particularly good mechanical properties. Medium molecular weight polyester resins containing more hydroxyl groups are suitable for the manufacture of stoving enamels with good reactivity and high solids content. In combination with highmolecular weight copolyesters the quality of films can be optimized. Depending on the technical require - ments and the method of processing, DYNAPOL® grades can also be used to manufacture industrial coatings.
BLOCKED ONE PACK POLYESTER-POLYURETHANE SYSTEMS.
PUR SYSTEMS FOR STOVING ENAMELS
DYNAPOL® UB systems are made from saturated, hydroxylated polyester resins and blocked, cycloaliphatic polyisocyanate crosslinkers. Evonik pioneered the development of PUR chemistry for coatings and now offers a range of high quality monomers, polyisocyanates, prepolymers and PUR systems based on VESTANAT®. DYNAPOL® UB systems are suitable for the manufacture of industrial coatings, particularly coil coatings with high formability, good surface hardness and outstanding weatherability. Because of these properties special DYNAPOL® UB types are also used to formulate high quality, storage stable, 1-pack PUR spray coatings. The performance profile of DYNAPOL® UB-stoving enamels can be adjusted to the various enduses by suitable paint formulations. Particularly the modification with special Polyamide 12 fine powders (VESTOSINT®) results in special surface textures along with outstanding abrasion resistance and reduced tendency for dirt pick-up.