| abstract |
The present invention relates to a process for preparing emulsion polymers having a hollow structure. More specifically, the present invention relates to a process for preparing emulsion polymers which comprises forming a core which is an alkali-swellable resin, carrying out a subsequential emulsion polymerization by means of a continuous variation in composition and a kinetic steric barrier to form a hard polymer shell outside the core, swelling the core with an alkali and then drying to remove water contained in the alkali-swellable core, thereby forming a closed internal pore in the center of polymer. |