| 摘要 |
PURPOSE:To obtain a toner resin stable in quality by adding a specified amt. of electrolyte to a vinyl monomer at the time of <= a specified polymn. percentage in polymerizing said vinyl monomer in water contg. an emulsifier and suspending agent. CONSTITUTION:A toner resin is prepared by polymerizing a mixture of styrene, a monomer mixture of styrene-butyl (meth)acrylate, or the like, in water contg. as an emulsifier, sodium dodecylsulfate, or the like, and as a suspending agent, an org. material, such as gelatin or partially saponified PVA, or an inorg. powder, such as barium sulfate or talc. Before the polymn. percentage reaches 50%, an electrolyte, preferably, aluminum potassium sulfate in a concn. of 1-400ppm is added to the vinyl monomer. As a result, an amt. of polymer to attach to the inside of a polymerization reactor is made very small, and good fine polymer particles are formed, and a toner good in offset resistance is obtained by using this polymer for the binder resin of the toner. |
