POLYMER PARTICLE HAVING A SPECIAL SHAPE LIKE AS SNOWMAN AND MANUFACTURING METHOD OF THE SAME

摘要

A polymer particle having a special snowman-like shape is provided to obtain non-spherical polymer particles having specific flow characteristics, light scattering characteristics and high whiteness through a simple process requiring no use of a co-solvent with high efficiency. A polymer particle having a special snowman-like shape is obtained by the method comprising the steps of: dissolving a radical polymerizable monomer, multi-functional crosslinking monomer, initiator and dispersion stabilizer into a solvent, and carrying out dispersion polymerization to provide mono-dispersed, partially crosslinked seed particles; dispersing the partially crosslinked seed particles in an aqueous phase, and introducing an initiator, radical polymerizable monomer and multi-functional crosslinking monomer thereto to activate the polymer particles; and heat treating the polymer particles obtained by suspension polymerization of the activated polymer particles. In the first step, the multi-functional crosslinking monomer is added in an amount of 5-25 parts by weight based on 100 parts by weight of the combined weight of the radical polymerizable monomer and the multi-functional crosslinking monomer.