| 摘要 |
PURPOSE:To obtain a magnetic toner supeior in fixability and improved in resistance to blocking, by mixing a wax having functional groups and a vinyl type copolymer each having a specified mol.wt. range, and a softening point not below a specified temp., in a specified proportion and using the resulting mixture as a binder. CONSTITUTION:The present magnetic toner uses a binder consisting of a wax having 300-2,000mol.wt., and >=70 deg.C softening point, and functional groups, such as COOH or CONH2 and of a vinyl type copolymer, such as ethylene-vinyl acetate copolymer, having 1,000-8,000mol.wt. and >=90 deg.C softening point, mixed in a 3:7-7:3 mixing ratio. As a result, the obtained toner is good in dispersiblity of magnetic particles, superior in pressure fixability, and improved in blocking resistance, and it can form a sharp image. |
