The organic pigment phthalocyanine blue (PB) was hydrophobic and compatible with monomer

it can be dispersed into monomer dispersion and monomer drops in primary particles form just through ultrasonic and strenuous stirring procedures.Thus a series of organic pigment microcapsules with high pigment encapsulated efficiency and sharp particles size distribution can be prepared via pre-polymerization treatment and in situ micro-suspension polymerization.It was found that the pre-polymerization treatment of monomer dispersion can effectively increase the viscosity of monomer drop phase in suspension and then improve its resistivity to tear

which is conducive to improving the polymerization stability and controlling the microcapsules particles size and size distribution.Optical microscope (OM) and transmission electron microscope (TEM) images of polymerization product show that almost all of the organic pigment particles have been successfully encapsules into pigment microcapsules in a homogeneous state

and thus the spheral microencapsules possess a typical ‘guava-like’structure characterization.It was also found from OM and dynamic light scattering (DLS) that the microencapsules particles size distribution can be controlled in a narrow level

and its mean size can be effectively adjusted in a rather large range just changing tricalciun phosphate (TCP) amount and stirring rate in the in situ micro-suspension polymerization.The microcapsules of pigment by adhesive polymer can remarkably improve the adhesion between the pigment and the target matrix

and simultaneously the dispersion of pigment particles on the matrix surface

thus the resulting organic pigment microcapsules are promising for a number of applications

e.g.pigment printing

pigment dyeing and ink printing.