| 摘要 |
The invention concerns a process for the manufacture of inorganic white pigments containing optical brighteners, characterized in that, in an aqueous suspension of an inorganic white pigment which contains a dispersion of at least one optical brightener which is sparingly soluble in water, dispersed by means of non-ionic surface-active agents, property-improving auxiliary substances for such pigments are precipitated or adsorbed on these pigments in a manner which is in itself known by admixing the property-improving auxiliary or admixing the components for the formation of such a property-improving auxiliary if several components for its formation are necessary, and the pigments treated in such manner are separated from the aqueous phase, washed and dried. The invention provides a valuable method for homogeneously distributing optical brightening agents in combination with white pigments in plastics. |
