FINE POLYMER PARTICLE AND ITS PRODUCTION

摘要

PURPOSE:To obtain fine polymer particles useful for, e.g. an electrophotographic toner, which are made of a polymer comprising a specified amount of repeating units derived from an N-vinylformamide as a monomer structural unit and a specified amount of repeating units derived from a vinyl compound copolymerizable therewith as another monomer structural unit and which have a specified particle diameter. CONSTITUTION:The fine polymer particles are made of a polymer comprising 1-100mol% structural units derived from an N-vinylformamide and 99-0mol% repeating units derived from at least one vinyl compound (e.g. styrene) copolymerizable therewith and have a particle diameter of 0.1-20mum. This polymer is preferably obtained by polymerizing these monomers in the presence of a polymeric dispersant [e.g. poly(2-methyl-2-oxazoline)] in a solvent (e.g. methanol) which can dissolve these monomers but cannot dissolve the formed polymer.