| abstract |
There is provided a catalyst for isocyanate polymerization, a method for producing the same, and a method for producing a polyisocyanate containing an isocyanurate group using the same. The catalyst is a carboxylic acid salt containing di-quaternary ammonium ions. The structure of the catalyst includes a hydroxyl group-containing aromatic heterocyclic moiety. The catalyst has high activity. Only a small amount of catalyst is required for the polymerization of isocyanates. The prepared polyisocyanate has a color value lower than 25 Hazen, a monomer content of less than 0.5% by weight, a high isocyanurate content and a low viscosity. |