| abstract |
The invention relates to a single-component sealant or adhesive composition, comprising: a) an aqueous polymer dispersion comprising water and at least one water-dispersed polymer P, b) at least one water-dispersed or water-dissolved epoxy- or isocyanate- functional cross-linker C with a nominal epoxy- or isocyanate- functionality of at least 2, wherein said at least one water-dispersed polymer P has functional groups selected from carboxylic acid groups, amino groups, and hydroxyl groups, and wherein said epoxy- or isocyanate-functional cross-linker C has a molecular weight of at least 1000 g/mol or a number average molecular weight Mn, determined by means of GPC against polystyrene as standard, of at least 1000 g/mol, and wherein the composition comprises between 0.1 and 50, preferably between 0.1 and 10 parts by weight of said epoxy- or isocyanate- functional cross-linker C per 100 parts by weight of said at least one water-dispersed polymer P. The composition is highly suitable as sealant or adhesive and shows excellent mechanical properties and resistance, e.g. towards water immersion, but at the same time exhibits good storage stability. |