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Improved saturated polyester ­resins for polyurethane coatings from carbohydrate-derived, bio-based building blocks

von Bas van Leeuwen; Chris Schaekens; Paul Cordfunke

Saturated polyester resins have been used for many years to produce high-performance materials, such as solvent-based polyurethane (PU) coatings. The current challenge in the industry is to reduce the carbon (or CO2) footprint of coating systems. This can be achieved by using materials obtained from renewable resources, e. g. lactide. This sustainable product can be used as a chemical building block for saturated polyester- and alkyd resins for PU coatings. Lactide has a low carbon footprint and when incorporated into these resins, it helps to achieve CO2 reduction. Furthermore, lactide provides significantly lower saturated polyester- and alkyd resin viscosities without compromising on coating performance.