PROCESS FOR THE PRODUCTION OF EXPANDABLE ETHYLENICALLY UNSATURATED POLYMER PARTICLES

摘要

Expandable ethylenically unsaturated polymer particles are produces by using in the process a suspension stabilizer comprising calcium carbonate particles having the surfaces thereof treated with resin acid. The method for the production of such expandable ethylenically unsaturated polymer particles from ethylenically unsaturated polymer particles includes suspending such particles in water and impregnating the particles with an organic expanding agent having a boiling point lower than the softening point of the polymer particles.