Patent ID: 6280511
Filing Date: 2001-08-28
Classification: C08K,C09D,G03G,Y10T

Abstract:
A process for preparing a pigmented microbead comprising a polymer, an organic pigment of particle size .ltoreq.1 .mu.m and optionally one or more further compounds wherein a microbead that comprises a thermoplastic polymer or a mixture of thermoplastic polymers and a pigment precursor or a mixture of pigment precursors throughout distributed therein, the melting temperature of the lowest-melting polymer of the microbead being higher than the lowest temperature required to transform all pigment precursors within the microbeads into the respective pigments is contacted with a Broensted acid in liquid form and wherein the transformation of the pigment precursors to the corresponding in pigments is carried out in presence of said Broensted acid.