| 摘要 |
PURPOSE:To obtain a toner composition superior in image smoothness, fixability, offset resistance, and pulverizability by incorporating a vinyl polymer satisfying specified conditions as a main component. CONSTITUTION:The vinyl polymer to be used as a main component satisfies the following conditions; a number average molecular weight of 1,000-10,000, a weight average molecular weight/number average molecular weight ratio of 41-200, a glass transition point of 50-70 deg.C, and a viscosity of 50,000-5,000,000 poise at a shearing speed of 1sec<-1> and a temperature of 110 deg.C, and 10-1,000 poise at a shearing speed of 10,000sec<-1> and a temperature of 190 deg.C. The vinyl polymer is prepared by polymerizing or copolymerizing a vinyl monomer or vinyl monomers, such as methyl acrylate, ethyl acrylate, or propyl acrylate, by the usual polymerization method, such as suspension, solution, or block polymerization, thus permitting the obtained toner composition to be superior in image smoothness, fixability, offset resistance, and pulverizability. |
