Water dispersible polyisocyanates containing alkoxysilane groups

摘要

The present invention relates to compounds having an isocyanate group content (calculated as NCO, MW 42) of 0.2 to 20% by weight and an alkoxysilane group content (calculated as Si, MW 28) of 0.2 to 4.5% by weight, wherein the preceding percentages are the weight of the compounds, and containing sufficient chemically incorporated hydrophilic groups to form a stable dispersion in water, 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) compounds containing secondary amino groups and alkoxysilane groups. The present invention is also directed to the use of these compounds in admixture with isocyanate-reactive resins in aqueous, two-component coating, adhesive and sealant compositions.