Composition comprising a blocked polyisocyanate

Abstract

Use of a compound according to one of the formulae I to III 1 in which R1 to R4 stand independently of one another for hydrogen or for an alkyl radical having 1 to 25 carbon atoms or, in combination of two or three or four of the radicals R1 to R4, for an aliphatic ring system having 1 to 25 carbon atoms, where in the case of the formula I R2 and R3 taken together or R3 and R4 taken together may also denote a substituted or unsubstituted (preferably unsubstituted) benzene ring which is fused onto the pyrazole ring for stabilizing blocked polyisocyanates against thermal yellowing. The present invention further relates to compositions comprising blocked polyisocyanates and at least one compound according to formula I to III, to coating materials comprising this composition, and also to coatings and substrates containing these coating materials.

Dependencies are inferred from the claim text.