Depolymerization of polyisocyanurates with organic amine bases

A method of hydrolyzing a polyisocyanurate, comprising:

• producing the polyisocyanurate by reacting one or more polyol(s) selected from the group consisting of polyesterpolyol, a mixture of polyesterpolyols and a mixture of polyester- and polyetherpolyols, with an excess of one or more isocyanate(s) selected from the group consisting of organic isocyanate, a mixture of organic isocyanates, organic polyisocyanate a mixture of organic polyisocyanates and a mixture of organic isocyanate(s) and organic polyisocyanate(s), and
• bringing into contact the polyisocyanurate with water in presence of an organic amine base to yield one or more carboxylic acid(s) comprising equal to or more than 2 carboxylic acid groups per molecule and corresponding to the carboxylic acid(s) used to prepare the polyesterpolyol(s) that was/were used to prepare the polyisocyanurate, and one or more polyol(s) corresponding to the polyol(s) used to prepare the polyesterpolyol(s) that was/were used to prepare the polyisocyanurate, and one or more organic amine and/or polyamine, which correspond(s) to the organic isocyanate or polyisocyanate used to prepare the polyisocyanurate, and
• wherein the reaction mixture comprising the polyisocyanurate, water and the organic amine base is a stirred homogeneous or heterogeneous mixture during hydrolysis.