Basf Corporation

Andreas Poppeq

Guenter Klein

Michael Kutschera

The invention relates to coating agents, containing (A) at least 50 wt. %, (in relation to the content of non-volatile substances in said coating agent), of at least one compound (A1) and/or (A1') comprising at least two reactive groups of formula (I): &#x2014;X&#x2014;SiR&#x2033;x(OR&#x2032;)3-x, in which R&#x2032;=hydrogen, alkyl or cycloalkyl, whereby the carbon chain can be interrupted by non-adjacent oxygen, sulphur or NRa groups, Ra=alkyl, cycloalkyl, aryl or aralkyl, X=a linear and/or branched alkene or cycloalkene group comprising between 2 and 20 carbon atoms, R&#x2033;=alkyl, cycloalkyl, aryl or aralkyl, whereby the carbon chain can be interrupted by non-adjacent oxygen, sulphur or NRa groups, and x=0 to 2, (B) a catalyst for cross-linking the &#x2014;Si(OR&#x2032;)3-x units, and (C) an organic solvent or a mixture of organic solvents. According to the invention, during the curing of the coating agents, the reactive groups (I) are cross-linked in such a way, that the following characteristics are noted during the nanoindentation test on the cured coating: elastic recovery of volume &#x3e;86.5%; plastic deformation &#x3c;3.5%; brittle deformation &#x3c;10.0%.

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Sendenhorst, Germany

Andreas Poppeq