Polyurea-covered particle having narrow particle size distribution and its production

摘要

The present invention provides a polyurea-covered particle having a narrow particle size distribution, which comprises a vinyl polymer particle as a seed particle and a polyurea cover layer formed on the vinyl polymer particle. The present invention also provides a process for producing the polyurea-covered particle having a narrow particle size distribution, which comprises: dispersing vinyl polymer particles having a narrow particle size distribution in an aqueous medium, adding thereto a polyisocyanate compound to swell the vinyl polymer particles, and adding a polyamine compound to effect interfacial polymerization.