N-substituted isocyanurates

The invention comprises the alkyl esters of di- and tri-(b -carboxyethyl)-isocyanurates. The compounds are prepared by esterification of di- or tri-(b -carboxyethyl)-isocyanurate with the appropriate alcohol, preferably one containing up to 8 carbon atoms, e.g. by heating the reactants in an acid medium. By limiting the amount of alcohol the partial esters may be obtained. The novel esters may be used to prepare polyesters by transesterification with polyhydric alcohols, e.g. ethylene glycol and butanediol. Examples describe the preparation of di- and tri-(b -carbethoxy)-isocyanurates and of a polyester from tri-(b -carbethoxy)-isocyanurate and hexamethylene glycol. Reference has been directed by the Comptroller to Specification 912,563.ALSO:Polyesters are made by transesterification of alkyl esters of di- or tri-(b -carboxyethyl)-isocyanurate with a polyhydric alcohol. These polyesters react with organic isocyanates to give polyurethanes which may be foamed. Example 3 describes the preparation of a polyester from tri-(b -carbethoxy)-isocyanurate and hexamethylene glycol in the presence of Sb2O3 and reacting this polyester with toluene diisocyanate in the presence of N-methyl morpholine, water and a detergent to give a foam which is cured at 105 DEG C. Reference has been directed by the Comptroller to Specification 912,563.