Patent ID: 7883574
Filing Date: 2011-02-08
Classification: B82Y,C09B,C09D,Y10S

Abstract:
1. A process for preparing nanoscale particles of benzimidazolone pigments, comprising: providing one or more organic pigment precursor to a benzimidazolone pigment, comprising a benzimidazolone moiety, providing a solution or suspension of a sterically bulky stabilizer compound that associates non-covalently with a benzimidazolone moiety on one of the pigment precursors, wherein the sterically bulky stabilizer compound is selected from the group consisting of substituted pyridine derivatives, alkylated benzimidazolone compounds, alkylated derivatives of aromatic acids, and mixtures thereof, and carrying out a coupling reaction to form a benzimidazolone pigment composition, whereby the pigment precursors are incorporated within the benzimidazolone pigment and one or more functional moieties on the benzimidazolone pigment is non-covalently associated with the sterically bulky stabilizer, so as to limit an extent of particle growth and aggregation and result in nanoscale-sized pigment particles.