| abstract |
If, in the production of blocked polyisocyanates with built-in polyalkylene oxide units and ionic groups, either a polyisocyanate containing polyalkylene oxide units and ionic groups is first prepared without the use of blocking agents and only then the free isocyanate groups of this intermediate are blocked or alkali bisulfite is used as a blocking agent, technically superior products are obtained which are excellent as crease-resistant agents and - optionally in combination with fluorinated organic compounds - as water repellents / oil repellants for textile materials. |