| abstract |
The present invention relates to aqueous solutions or dispersions of compositions containing A) compounds, which contain 0.5 to 15% by weight of alkoxysilane and/or silanol groups (calculated as Si, MW 28), based on the weight of the compounds containing alkoxysilane groups, and are substantially free from isocyanate groups and chemically incorporated hydrophilic groups, wherein the alkoxysilane groups are initially incorporated by the reaction of a polyisocyanate with an amino compound corresponding to formula I (see formula I) wherein X represents identical or different organic groups which are inert to isocyanate groups below 100°C, provided that at least one of these groups is an alkoxy group, Y represents a linear or branched alkylene group having 1 to 8 carbon atoms and R1 represents an organic group which is inert to isocyanate groups at a temperature of 100°C or less, and B) 1 to 20% by weight, preferably 1 to 15% by weight and most preferably to 2 to 10% by weight of colloidal silica, based on weight of the compounds containing alkoxysilane groups. The present invention also relates to coating, adhesive or sealing compositions containing these aqueous compounds as the binder. |