Desmodur® Z 4470 SN is an aliphatic polyisocyanate (IPDI trimer), with approx. 70 % in solvent naphtha® 100. It is used as the hardener component for lightfast polyurethane coating systems and as an additive resin for alkyd spray coatings. This product has a viscosity at 23°C of 2,000 ± 600 mPa·s, a viscosity at 25°C of approx. 1,700 mPa·s, and a density at 20°C approx. 1.05g/ml.
On account of its high hardness, Desmodur® Z 4470 SN is normally mixed with Desmodur® N products. Preferred co-reactants are flexibilised polyacrylate polyols such as Desmophen® A 565 and A 575 and polyester polyols such as Desmophen® 670. As Desmodur® Z 4470 SN has very good physical drying properties, it is also used as an additive resin in alkyd spray coatings to accelerate drying. The main applications of such coatings are in automotive refinishing and industrial finishing.
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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