Abstract: The present invention relates to a polyisocyanate adduct mixture which at a 100% solids concentration has an isocyanate content of about 4 to 19 weight percent and is liquid at room temperature. The adduct mixture is prepared from a biuret-containing polyisocyanate and a monohydroxy alcohol which contains 11 to 36 carbon atoms. The adduct mixture possesses good storage stability in common polyisocyanate solvents and good compatibility with apolar solvents. The present invention also relates to the use of the liquid polyisocyante adduct mixture in the process of curing alkyd or acrylic resins and to compositions containing the adduct mixture and alkyd or acrylic resins.

Abstract: The present invention relates to a modified polyisocyanate having improved compatibility with aliphatic hydrocarbon solvents comprising the reaction product of(a) an aliphatic biuret isocyanate having the formula ##STR1## and (b) about 0.05 to 0.5 mols per equivalent of isocyanate of an aliphatic monohydroxy alcohol having at least 8 carbon atoms.

Abstract: The present invention is directed to light stable polyisocyanate adduct mixtures with an average functionality greater than 2.0 and an isocyanate content of between about 4 and 19 percent by weight based on solids, which has good compatibility with apolar solvents and good storage stability in a solution of polyisocyanate solvents. The polyisocyanate adduct mixtures are based on the reaction product of a polyisocyanate, preferably a biuret-containing polyisocyanate, with a first monohydroxy compound containing a saturated hydrocarbon chain of at least 8 carbon atoms and a second monohydroxy compound containing at least one polarity inducing group. Alternatively, both the saturated hydrocarbon chain and the polarity inducing group may be present in the same monohydroxy compound.The present invention is additionally directed to the use of the polyisocyanate adduct mixtures in the process of curing alkyd or acrylic resins and to compositions containing the adduct mixture and alkyd or acrylic resins.