Polyurethane Coating Material Composition, Multi-stage Coating Methods, And Also The Use Of The Coating Material Composition

摘要

Described are nonaqueous coating material compositions comprising (A) at least one polyhydroxyl group-containing compound, (B) at least one polyisocyanate group-containing compound having free or blocked isocyanate groups, (D) at least one amine-blocked phosphoric acid or phosphonic acid compound as a catalyst and (S) at least one monomeric aromatic optionally substituted carboxylic acid whose carboxyl group is in conjugation with a π-electron system, wherein the component (B) comprises at least one structural unit —NR—(X—SiR″x(OR′)3−x) (II), and/or at least one structural unit —N(X—SiR″x(OR′)3−x)n(X′—SiR″y(OR′)3−y)m (III). Also described are multistage coating methods, and use of the coating material compositions.

主权项

1. A nonaqueous coating material composition comprising
(A) at least one polyhydroxyl group-containing compound, (B) at least one polyisocyanate group-containing compound having free or blocked isocyanate groups, wherein the at least one polyisocyanate-group containing compound has at least one structural unit of formula (I)
—NR—(X—SiR″x(OR′)3−x)  (I),and/or at least one structural unit of formula (II)
—N(X—SiR″x(OR′)3−x)n(X′—SiR″y(OR′)3−y)m  (II), wherein R is alkyl, cycloalkyl, aryl or aralkyl, it being possible for the carbon chain to be interrupted by nonadjacent oxygen, sulfur or NRa groups, wherein Ra is alkyl, cycloalkyl, aryl or aralkyl, R′ is hydrogen, alkyl or cycloalkyl, it being possible for the carbon chain to be interrupted by nonadjacent oxygen, sulfur or NRa groups, X, X′ are linear and/or branched alkylene or cycloalkylene radical having 1 to 20 carbon atoms, R″ is alkyl, cycloalkyl, aryl, or aralkyl, it being possible for the carbon chain to be interrupted by nonadjacent oxygen, sulfur or NRa groups, n is 0 to 2, m is 0 to 2, m+n=2, and x, y are 0 to 2, and (D) a catalyst comprising at least one phosphoric acid compound blocked with an amine or at least one phosphonic acid compound blocked with an amine, or mixtures thereof, and (S) at least one monomeric aromatic optionally substituted carboxylic acid comprising a carboxyl group is in conjugation with a π-electron system.