| abstract |
The present invention relates to a composition for the preparation of a coating comprising (a) a silane derivative of the formula (I) wherein R 1 , R 2 , R 3 and R 4 , which may be the same or different, are selected from alkyl, acyl, alkyleneacyl, cycloalkyl, aryl or alkylenearyl, which may optionally be substituted, and / or a hydrolysis and / or condensation product of the silane derivative of the formula (I), (b) a silane derivative of the formula (II) R 6 R 7 3-n Si (OR 5 ) n (II) wherein R 5 is an unsubstituted or substituted alkyl, acyl, alkyleneacyl, cycloalkyl, aryl or alkylenaryl group, R 6 is an organic radical containing an epoxide group, R 7 is an unsubstituted or substituted alkyl, cycloalkyl, aryl or alkylenaryl group, n is 2 or 3, and / or a hydrolysis and / or condensation product of the silane derivative of the formula (II), (c) a colloidal inorganic oxide, fluoride or oxyfluoride, (d) a cycloaliphatic or aromatic epoxy compound having at least two epoxide groups, (e) a solvent containing an alcohol, ether and / or ester. |