| 摘要 |
The present invention relates to aqueous compositions containing a mixture of a) 50 to 95% by weight, based on the resin solids content of components a) and b), of an aqueous polyurethane/urea dispersion containing 0.5 to 6% by weight, based on the weight of the polyurethane/ureas, of alkoxysilane groups (calculated as Si, MW 28) and b) 5 to 50% by weight, based on the resin solids content of components a) and b), of a water reducible oligomer which is substantially free from isocyanate groups and has an alkoxysilane group content (calculated as Si, MW 28) of 1 to 6% by weight, based on the weight of the oligomer, and wherein the alkoxysilane groups are incorporated as the reaction product of I) a polyisocyanate component having a minimum average functionality of 2.4 and containing at least 50% by weight of polyisocyanate adducts and II) a compound containing amino and alkoxysilane groups. The present invention also relates to coatings, sealants and adhesives prepared from these aqueous compositions.
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