Polyurethane Trimerization Catalysts in Coatings: Formation of Isocyanurate Structures Abstract: Polyurethane (PU) coatings are ubiquitous in various industries due to their excellent mechanical properties, chemical resistance, and versatility. A key factor influencing these properties is the crosslinking density, which can be significantly enhanced through the trimerization of isocyanate groups, forming isocyanurate rings. This process requires...