Patent ID: 8709544

Claim:
A method of coating a substrate, the method comprising: applying to the substrate in a desired thickness at least one coating composition, optionally drying the at least one coating composition by at least partly removing a volatile constituent, and curing the at least one coating composition, wherein the at least one coating composition comprises: (A) a polyisocyanate comprising, in reacted form, a monomeric isocyanate, (B) a compound comprising at least two isocyanate-reactive groups, and having a number-average molecular weight Mn of at least 1000 g/mol and an OH number of 40 to 350 mg KOH/g, (C) an imidazolium salt as a urethanization catalyst, (D) optionally a solvent, (E) optionally a urethanization catalyst other than (C), and (F) optionally another coating component or additive; and the imidazolium salt (C) has a formula wherein: R 1 and R 3 each independently are an organic radical comprising 1 to 20 C atoms, R 2 , R 4 and R 5 each independently are an H atom or an organic radical comprising up to 20 C atoms, and A − is an anion.