| 摘要 |
<p>According to the invention, a method for providing urea particles in a solvent medium is provided. The method comprises the steps of providing at least one polyisocyanate component dissolved in a first solvent; providing at least one isocyanate-reactive polyamine component dissolved in a second solvent; providing at least one isocyanate-reactive monoamine, optionally dissolved in a third solvent; reacting the polyisocyanate component, the polyamine component and the monoamine, by combining the polyisocyanate component dissolved in the first solvent, the polyamine component dissolved in the second solvent and the monoamine optionally dissolved in the third solvent, thereby providing urea particles dispersed in a solvent medium, the solvent medium comprising said first solvent, the second solvent and optionally the third solvent, whereby the monoamine is a monoamine soluble in the solvent medium.</p> |
