| 摘要 |
<p>A process for the manufacture of a solid urea-formaldehyde resin comprises steps a) to d). Step a), the initial reaction step is carried out under specified conditions with an F:U ratio of at least 2.5 to 1. The F:U ratio is lowered by addition of urea in step c) and water is evaporated without precipitation of the resin in step d).</p> |
