Patent ID: 8809523
Filing Date: 2014-08-19
Classification: C09B

Abstract:
1. A process for preparing nanoscale pigment particles of phthalocyanine pigments, comprising the steps of: (i) providing: (1) an unsubstituted phthalocyanine chromogen material comprising an unsubstituted phthalonitrile; and (2) a substituted phthalocyanine chromogen material comprising a substituted phthalonitrile, wherein the substituted phthalonitrile is substituted with an alkylphenoxy group; (ii) reacting the unsubstituted phthalocyanine chromogen material and the substituted phthalocyanine chromogen material to form a mixture of unsubstituted phthalocyanine dye molecules and substituted phthalocyanine dye molecules, and (iii) causing said substituted phthalocyanine dye molecules to non-covalently associate with the unsubstituted phthalocyanine dye molecules, so as to limit an extent of particle growth and aggregation and result in nanoscale pigment particles, wherein at least one of the substituted phthalocyanine dye molecules comprises a molecule of the formula: where M is an atom or group of atoms capable of bonding to the central cavity of a phthalocyanine molecule, and axial ligands can optionally be attached to M; and the unsubstituted phthalocyanine dye molecule is represented by the formula: where M is a metal or group of metals or atoms capable of bonding to the central cavity of the phthalocyanine molecule.