Patent ID: 7772320

Claim:
A thermosetting one component, thermally curable, coating material comprising (A) at least 50% by weight, based on the amount of nonvolatile substances in the coating material, of a mixture of (A1) from 25% to 50% by weight, based on the entirety of components (A1) and (A2), of a polymethacrylate copolymer comprising more than 50% by weight, based on the entirety of comonomers in the copolymer (A1), of free-radically polymerizable, ethylenically unsaturated compounds (a1), comprising at least one reactive group of the formula I −X−SiR″ x (OR) 3-x (I) where R′ is a hydrogen, alkyl or cycloalkyl, the carbon chain being uninterrupted or interrupted by nonadjacent oxygen, sulfur or NRa groups, where Ra is an alkyl, cycloalkyl, aryl or aralkyl, X is a linear and/or branched alkylene or cycloalkylene radical having 2 to 20 carbon atoms, R″ is an alkyl, cycloalkyl, aryl or aralkyl, the carbon chain being uninterrupted or interrupted by nonadjacent oxygen, sulfur or NRa groups, and x=0 to 2; and (A2) from 50% to 75% by weight, based on the entirety of components (A1) and (A2), of an adduct (A2) of polyisocyanate and alkoxysilane, (A2) comprising at least one reactive group of the formula II: —NR—C(O)−N—(X−SiR″(OR′) 3-x ) n (X′—SiR″ y (OR′) 3-y ) m (II) where X, R′, and R″ represent the structural units described in formula I and where R is a hydrogen, alkyl, cycloalkyl, aryl or aralkyl, the carbon chain being uninterrupted or interrupted by nonadjacent oxygen, sulfur or NRa groups, where Ra is an alkyl, cycloalkyl, aryl or aralkyl, X′ is a linear and/or branched alkylene or cycloalkylene radical having 2 to 20 carbon atoms, n=0 to 2, m=0 to 2, m+n=2, x=y=0 to 2, and wherein greater than 95 mol % of the isocyanate groups of the polyisocyanate have undergone reaction with the alkoxysilane; (B) a catalyst for the crosslinking of the —SiR″ x (OR′) 3-x and —SiR″ y (OR′) 3-y units, and (C) an aprotic solvent or a mixture of aprotic solvents, wherein the aprotic solvent (C) has a water content of not more than 1% by weight, based on the solvent.