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) manufactures adhesive raw materials for use in the production of contact and heat-activated adhesives, as well as reactive and hot-melt adhesives for the transportation, furniture, footwear, packaging, and construction markets. Bayer offers a comprehensive range based on polyurethane and polychloroprene, with specialty raw materials that offer UV light and weather resistance.
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