| abstract |
The present invention relates to a method for preparing polymer particles comprising an effective amount of at least one colorant, a polymer matrix, and secondary particles dispersed within the polymer matrix. The method comprises the following steps: A) preparing an emulsion of the polymer formed from the monomer blend in the aqueous phase, and forming secondary particles in the aqueous phase, and B) an amount effective for coloring. Adding at least one colorant to the aqueous phase, C) dispersing or dissolving the colorant in the aqueous phase, and D) subjecting the emulsion to dehydration in a spray dryer. [Selection figure] None |