Desmodur® LD is a low-functionality isocyanate based on hexamethylene diisocyanate, used to improve the storage stability of pigmented moisture-curing one-pack polyurethane coatings with good lightfastness and weather stability. This product has a monomeric HDI of < 0.5%, a color value (hazen) of ≤ 50, a viscosity at 23°C of 75 ± 15 mPa·s, and an isocyanate content of 12.1 ± 0.4%.
Beginning at 50 °C, Desmodur® LD reacts with water, releasing carbon dioxide and acting as a dewatering agent to ensure the storage stability of pigmented moisture-curing one-component polyurethane coatings. The stoichiometric conversion of 1 g water requires approx. 40 g Desmodur® LD. However, trials and actual use have shown that the best results are achieved using double to three times this quantity of Desmodur® LD.
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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