Colour-stable curing compositions containing polyisocyanates of (cyclo)aliphatic diisocyanates

A polyisocyanate composition comprising

• (A) at least one polyisocyanate obtained by reacting at least one monomeric (cyclo)aliphatic isocyanate selected from the group consisting of hexamethylene diisocyanate, pentamethylene diisocyanate, isophorone diisocyanate, 1,3-bis(isocyanatomethyl)cyclohexane, 4,4′-di(isocyanatocyclohexyl)methane and 2,4′-di(isocyanatocyclohexyl)methane, wherein the at least one polyisocyanate has an NCO content of at least 15% by weight,
• (B) at least one silyl ester selected from the group of silyl phosphates and silyl phosphonates in an amount of 0.2 to 300 ppm by weight, based on component (A),
• (C) at least one sterically hindered phenol having exactly one phenolic hydroxyl group per aromatic ring, and wherein at least one ortho position, relative to the phenolic hydroxyl group, bears a tert-butyl group,
• (D) at least one Lewis-acidic organic metal compound capable of accelerating the reaction of isocyanate groups with isocyanate-reactive groups,
• (E) at least one solvent,
• (F) optionally at least one further antioxidant, and
• (G) optionally other coatings additives;
• wherein the at least one silyl ester (B) is a tris(silyl) phosphate.