| 摘要 |
<p>The invention relates to an aqueous dispersion containing a polyurethane composed of: a) organic diisocyanates; b) dihydroxy compounds with a mol wt. of 500 to 5000 g/mol, which do not contain an ionic group or a group that can be converted into an ionic group; c) mono- to trihydric alcohols that additionally contain an ionic group, and; d) optional additional compounds that are different from a) to c). The invention is characterized in that: the polyurethane contains less than 0.6 % by weight of urea groups (calculated with a mol wt. of 56 g/mol); the ionic group of c) is, at least in part, neutralized with ammonia, and; the reaction of compounds a), b), c) and d) does not ensue in the presence of a metalorganic catalyst.</p> |
