Desmophen® 680 BA is a branched hydroxyl-bearing polyester that is ideally used as a co-reactant for Desmodur® N in the formulation of two-component polyurethane coatings with good gloss retention, lightfastness and chalking resistance. It can also be used in combination with Desmodur® L and HL in the formulation of fast-drying two-component coatings. This product as a viscosity at 23°C of 3,000 ± 500 mPa·s, a non-volatile content (2g resin/2ml toluene/1h 125°C, convection oven) of 70±1%, and a flash point of approx. 32°C.
Desmophen® 680 BA is a hard co-reactant for use with Desmodur® N. The drying properties of this combination are comparable with those of the acrylic Desmophen® resin/Desmodur® N systems developed specially for automotive repair paints. It is therefore particularly suitable for the formulation of air-drying automotive and industrial coatings. Coatings crosslinked with Desmodur® L and HL are particularly fast-drying, making them suitable for applications such as paper 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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