| 摘要 |
<p>A process for the manufacture of white and colored pigments comprising a white or a colored compound incorporated in a polycondensation resin, wherein the reactants for the formation of the polycondensation resin and the white and/or colored compound are introduced in an "All In One Reactor"(R), a kneader, a paddle dryer or a related system. The mixture is caused to react at a temperature in the range of 80°C to 300°C, with or without vacuum, at the same time removing during and/or at the end of the reaction any residual unreacted potentially toxic monomers and/or low molecular weight condensation products formed. Unlike in any state-of-the art processes, pigments made according to the present invention are directly formed in a broke-up crushed state so that the subsequent micronisation is either not required and/or is facilitated. The products are useful for coloring polymeric materials.</p> |
