Desmodur® VP LS 2257 is a blocked aliphatic polyisocyanate based on HDI. It can be used in combination with OH-functional polyols, preferably Desmophen® T-grade OH-functional polyesters, in the formulation of lightfast, one-component polyurethane baking coatings, especially in coil and can coating applications. This product has a non-volatile content (0.2g / 60min / 80°C) of approx. 70%, a viscosity at 23°C of approx. 2,300 mPa·s, and a color value (Hazen/APHA) of ≤ 100. Desmodur® VP LS 2257 was developed as the hardener for lightfast one-compnent polyurethane coatings whose stoving temperature can be reduced by the addition of a catalyst, e.g. 0.3 - 1.0% dibutyltin dilaurate (DBTL), without adversely affecting the storage stability of the ready-to-use coatings.
Covestro (formerly Bayer MaterialScience) provides raw materials, such as waterborne adhesives, major high solids coatings, advanced powder coatings, and specialty sealant chemistries. Bayer produces polycarbonates and polycarbonate blends, polyurethanes, and TPU resins, particularly for design and processing parts with TPU resins applications; helping products in a wide variety of applications look better and last longer.
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