| 摘要 |
<p>The invention relates to a process for preparing an aqueous solution of a polycondensate by a) preparing, in a first step, an aqueous solution of a precondensate composed of: at least one compound I containing at least two amino groups, at least one aldehyde II, at least one sulphonating agent III and, optionally, one or more co-reacting agents IV; b) converting, in a second step, the precondensate obtained in step a), optionally in the presence of one or more co-reacting agents IV, into a polycondensate at a lower pH than in step a), wherein, at the end of step a), any excess of unreacted compound III is reacted with an oxidizing agent and, in step b), an additional amount of the compound I is added to the precondensation product, and to the products thus obtained and to the use thereof.</p> |
