New method for recycling of polyisocyanurates

A method of hydrolyzing a polyisocyanurate,

• comprising:
• producing the polyisocyanurate by reacting one or more polyol(s) selected from the group consisting of polyesterpolyol, mixture of polyesterpolyols and mixture of polyester- and polyetherpolyols with an excess of one or more isocyanate(s) selected from the group consisting of organic isocyanate, mixture of organic isocyanates, organic polyisocyanate, mixture of organic polyisocyanates and mixture of organic isocyanate(s) and organic polyisocyanate(s),
• hydrolyzing the polyisocyanurate by contacting the polyisocyanurate with water in the presence of a 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, wherein
• the base comprises one or more base(s) selected from the group consisting of a base comprising an alkali metal cation and/or an ammonium cation and having a pKb value at 25° C. of from 1 to 10,
• and
• a strong inorganic base having a pkb value at 25° C. of <1.