Bayhydur® 304 is hydrophilically modified, aliphatic polyisocyanate based on hexamethylate diisocyanate (HDI). It is as the hardener/binder component for high-quality waterborne polymer dispersions and as an additive to improve the property level of waterborne coating and adhesive systems. This product has a NCO content of 18.2 ± 0.5, a viscosity at 23°C of 4,000 ± 1,500, a hazen color value of ≤ 60, and a monomeric HDI content of < 0.15. This product is used mainly as the crosslinking partner for waterborne polyol binders (Bayhydrol®) and as a crosslinker for largely pH-neutral waterborne polymer dispersions, including polyurethane (Dispercoll® U), polyvinyl acetate, polyacrylate and synthetic rubber dispersions.
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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