2-Hydroxyethyl acrylate → Urethane acrylate

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Metal-containing polyol from Example 6 was used to prepare a zinc salt urethane diacrylate oligomer based on isophorone diisocyanate and hydroxyethyl acrylate. Isophorone diisocyanate (IPDI, 135.41 g) was added to the polyol which was diluted with 25% ethoxylated trimethyolpropane triacrylate (polyol, 2000.0 g; SR454, 100.0 g) over 2 hours at 60° C., followed by addition of hydroxyethyl acrylate (70.8 g). The reaction mixture was kept at 90° C. for 4 hour. A viscous liquid resin was obtained. The final product is light yellow and hazy liquid. The viscosity @ 60° C. is only 920 cps.

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