| abstract |
The invention concerns a coating compound containing A) 56 to 89 % by wt. of at least one ethylenically unsaturated polyurethane optionally containing urea groups, B) 10 to 30 % by wt. of at least one ethylenically unsaturated monomer, C) 0.5 to 8 % by wt. of at least one photo-initiator and D) 0.05 to 6 % by wt. of d1?) at least one azidosilane N3?-R?3-Si-R?1n?(OR?2)3-n? in which R?1 is a C1?-C3? alkyl, phenyl, benzyl or toluyl group, R?2 is a C1?-C4? alkyl, C2?-C4? alkoxyalkyl, phenyl or benzyl group, R?3 is a C1?-C8? alkylene group which may include in the chain an oxygen atom, a sulphur atom or an -(NR?4) group, R?4 being hydrogen or a methyl, ethyl or phenyl group, and n is 0, 1 or 2, and, optionally, d2?) at least one aminoalkoxysilane H2?N-R?5-Si-R?6m?(OR?7)3-m? in which R5? is a C1?-C6? alkylene, C5?-C6? cycloalkylene or C5?-C6? arylene group which may, in addition, be substituted by one or two C1?-C3? alkyl groups, R?6 and R?7 are C1?-C6? alkyl or C5?-C6? cycloalkyl groups which may be substituted by one or two C1?-C3? alkyl groups and m is 0, 1 or 2, the sum of the components A to D being 100 % by wt. and all weight percentages being relative to coating. |