in example 1 483 2 g of 2 hydroxyethyl acrylate was reacted with 456 g of epsilon caprolactone using 4 g of boron trifluoride etherate as catalyst after neutralization and filtration there was recovered 917 g of liquid adduct which remained liquid upon prolonged storage at ambient room temperature having an hydroxyl number of 240 mg koh g a viscosity of 35 3 cks at 38 u00b0 c and a color of 3 5 gardner units its average formula was in a similar manner the adduct is produced using 2 hydroxypropyl methacrylate or 4 hydroxycyclohexyl acrylate in place of the 2 hydroxyethyl acrylate in a manner similar to that described in example 1 458 g of the adduct shown above was reacted with 113 9 g of methyl isocyanate at 45 u00b0 to 50 u00b0 c using 0 35 g of dibutyltin dilaurate catalyst after stripping in vacuo there was recovered 559 g of liquid monomer iii having a viscosity of 72 cks at 38 u00b0 c a color of 4 gardner units and the average formula in a manner similar to that described in example 1 241 6 g of 2 hydroxyethyl acrylate was reacted with 912 g of epsilon caprolactone at 60 u00b0 to 70 u00b0 c using 2 g of boron trifluoride etherate after neutralization with magnesium silicate there was recovered 1 120 g of a slushy adduct having an hydroxyl number of 105 a viscosity of 316 cks at 38 u00b0 c a.