Polyurethane coating composition containing isocyanuric acid rings

Claim 1

A COATING COMPOSITION OBTAINED BY (A) REACTING AN EXCESS OF AN ORGANIC POLYISOCYANATE WITH AN ORGANIC COMPOUND HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 500, SAID ORGANIC COMPOUND BEING CAPABLE OF REACTING WITH A POLYISOCYANATE TO FORM A POLYURETHANE AND HAVING ONLY TERMINAL ALCOHOLIC HYDROXYL GROUPS AS THE SOLE REACTIVE MOIETY, AND THEREBY OBTAINING A PREPOLYMER HAVING FREE -NCO GROUPS; (B) MIXING AND REACTING SAID PREPOLYMER SUBSTANTIALLY SIMULTANEOUSLY WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF BUTANE AND TRIMETHYLOLPROPANE IN AN AMOUNT SUFFICIENT TO REACT WITH SOME BUT INSUFFICIENT TO REACT WITH ALL THE FREE -NCO GROUPS OF SAID PREPOLYMER, CONDUCTING SAID REACTION IN THE PRESENCE OF A TRIMERIZATION CATALYST AND AN INERT ORGANIC SOLVENT FROM THE GROUP CONSISTING OF METHYL EHTYL KETONE, DIETHYL KETONE, METHYL PROPYL KETONE, DIPROPYL KETONE, METHYL ISOBUTYL KETONE, BUTYL ACETATE, DIPROPYL ETHER, DIOXANE, TETRAHYDROFURAN, CHLOROBENZENE AND DICHLOROBENZENE; (C) AND EFFECTING THE REACTION UNTIL THE VISCOSITY OF THE REACTION MIXTURE IS ABOUT 1 TO ABOUT 2000 POISES AT ABOUT 30*C. TO OBTAIN THEREBY A COMPOSITION CONTAINING ISOCYANURIC ACID RINGS; (D) AND SUBSEQUENTLY ADDING TO SAID COMPOSITION A MEMBER SELECTED FROM THE GROUP CONSISTING OF MONOMERIC MONOHYDRIC ALCOHOLSD AND MONOMERIC PRIMARY MONOAMINES TO THEREBY REACT WITH THE FREE -NCO GROUPS PRESENT IN THE COMPOSITION OBTAINED IN (C) ABOVE, CONDUCTING THE REACTION WITH SAID MONOHYDRIC ALCOHOLS AND SAID PRIMARY MONOAMINES IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF METHYL ETHYL KETONE, DIETHYL KETONE, METHYL PROPYL KETONE, DIPROPYL KETONE, METHYL ISOBUTYL KETONE, BUTYL ACETATE, DIPROPYL ETHER, DIOXANE, TETRAHYDROFURAN, CHLOROBENZENE, DICHLOROBENZENE, DIMETHYL FORMAMIDE, DIMETHYL ACTAMIDE AND DIMETHYL SULFOXIDE UNTIL THERE ARE NO FURTHER -NCO GROUPS PRESENT.