Desmophen T 1775 SN is an oil free, hydroxyl-bearing polyester that is used in the formulation of lightfast one-component polyurethane baking coatings with blocked aliphatic polyisocyanates. It is binder certified for use in food-contact applications for the formulation of can coatings for food packaging. This product has a non-volatile content (2g resin/2ml toluene/1h 125°C/convection oven) of 75 ± 2%, a density at 20°C of approx. 1.08g/ml, and a viscosity at 23°C of 3,700 ± 600 mPa·s. Desmophen T 1775 SN was developed specially as a co-reactant for blocked polyisocyanates in coil coating applications. When combined with preferably Desmodur BL 4265, it yields one-component polyurethane coil coatings with a balanced hardness/flexibility ratio, good resistance to scratching and abrasion as well as excellent QUV/B stability. Dibutyltin dilaurate has proved suitable as the catalyst. The addition should be 0.1–1 %, calculated on the solid binder. The product can be combined with other blocked isocyanates and HMMM-type amino resins. However, such formulations do not generally achieve the same high surface hardness as is achieved with Desmodur BL 4265.
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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