Resinous microparticles useful in powdery toner for electrophotography.

摘要

Resinous microparticles useful in toner for electrophotography which are made of vinyl resin obtained by emulsion polymerization of at least one alpha , beta -ethylenically unsaturated monomers in the presence of cationic surfactant having an onium salt structure and a polymerization initiator having an amidine or amidine salt structure and whose average particle diameter is in a range of from 0.01 to 1 mu , and toner composition comprising toner particles and resinous microparticles as abovementioned are provided.