POLYMERIC PARTICLE CONTAINING PIGMENT AND ITS PRODUCTION

摘要

PURPOSE: To obtain particles used as an electrophotographic yellow toner or a carrier for an immunological diagnostic reagent by copolymerizing a monomer component containing a hydrophobic monomer in an aqueous system containing yellow organic pigment particles dispersed in the presence of a surfactant. CONSTITUTION: The polymeric particles containing a pigment are flocculated particles having a particle diameter of <=10 times the primary particle diameter and obtained by copolymerizing a monomer component containing a hydrophobic monomer with 0.1-15wt.% hydrophilic monomer in the presence of a polymerization initiator under conditions of the concentration [(a) mol/l of a polymerization initiator and the concentration [(b) mol/l of the monomer component, used in the polymerization step and satisfying the formulas, 0.001<=(a)<=0.03 and 0.004<=(a/b)<=0.10 in an aqueous system in which yellow organic pigment particles having a structure of formula I or II are dispersed at a concentration below the critical micelle-forming concentration in the presence of a surfactant.