| 摘要 |
<p>The present invention is directed to a process for the production of urea group-containing, finely divided solid polyisocyanates by emulsifying or suspending a urea group-free organic polyisoycanate in an excess of water so that said organic polyisocyanate amounts to about 1 to 65% by weight of the reaction mixture, said water containing about 0.01 to 5% by weight, based on the aqueous phase, of a protective colloid and reacting the organic polyisocyanate with water to yeild a urea group-containing polyisocyanate.</p> |
