Coating agents having improved runoff tendency

摘要

Coating compositions comprising at least one hydroxyl-containing compound (A), at least one isocyanato-containing compound (B) and at least one urea-group-containing compound (H) different from (B), compound (H) comprising at least one structural unit selected from the group consisting of a structural unit (I);
a structural unit (II)
;
a structural unit (III)

—NR′″—C(O)—N(X—SiR″x(OR′)3-x)n(X′—SiR″y(OR′)3-y)m, and combinations of two or more of the foregoing, compound (H) being obtained by reacting an isocyanato-containing compound (HG) with amino-containing compounds, wherein in compound (H) more than 90 mol % of the isocyanate groups originally present in (HG) have undergone reaction to form the structural units (I), (II), (III), or combinations thereof, where R′, R′″=hydrogen, alkyl, cycloalkyl, aryl or aralkyl; R, R″=alkyl, cycloalkyl, aryl or aralkyl; X, X′=linear and/or branched alkyl or cycloalkyl radical; x, y, n, m=0 to 2; and m+n=2.

主权项

1. A coating composition based on aprotic solvents, comprising at least one hydroxyl-containing compound (A), at least one isocyanato-containing compound (B), and at least one urea-group containing compound (H) different from the compound (B),
wherein (i) the urea-group-containing compound (H) comprises at least one structural unit of the formula (I):and at least one other structural unit, said other structural unit being selected from the group consisting of
(a) at least one structural unit (II) of the following formula (II) (b) at least one structural unit (III) of the following formula (III)
—NR′″—C(O)—N(X—SiR″x(OR′)3-x)n(X′—SiR″y(OR′)3-y)m  (III) and (c) at least one structural unit (II) of the formula (II) and at least one structural unit (III) of the formula (III), and (ii) the urea-group-containing compound (H) is obtained by reacting an isocyanato-containing compound (HG) with amino-containing compounds, and (iii) in the urea-group-containing compound (H) more than 90 mol % of the isocyanate groups originally present in the isocyanato-containing compound (HG) have undergone reaction to form the structural units (I) and (II), or (I) and (III), or (I) and (II) and (III), wherein, in the formulae (I), (II), and (III) R′″=hydrogen, alkyl, cycloalkyl, aryl or aralkyl, it being possible for the carbon chain to be interrupted by nonadjacent oxygen, sulfur or NRa groups, with Ra=alkyl, cycloalkyl, aryl or aralkyl, R,R″=alkyl, cycloalkyl, aryl or aralkyl, it being possible for the carbon chain to be interrupted by nonadjacent oxygen, sulfur or NRa groups, with Ra=alkyl, cycloalkyl, aryl or aralkyl, R′=hydrogen, alkyl or cycloalkyl, it being possible for the carbon chain to be interrupted by nonadjacent oxygen, sulfur or NRa groups, X, X′=linear and/or branched alkyl or cycloalkyl radical having 1 to 20 carbon atoms, x=0 to 2, y=0 to 2, and n=0 to 2, m=0 to 2, and m+n=2.