| 摘要 |
PURPOSE:To reduce the sticking of a toner to a magnetic head and to obtain a high density image by using a styrene-acrylic copolymer, magnetic powder and specified polyethylene wax. CONSTITUTION:A toner for magnetic printing by a heat roll fixing system is made of particles contg. a styrene-acrylic copolymer, 60-75wt% magnetic powder and 1-5wt% polyethylene wax having 7,000-12,000mol.wt. The styrene- acrylic copolymer has 15,000-17,000 weight average mol.wt. and 4,500-6,000 number average mol.wt. Since the magnetic toner contains the polyethylene wax, the sticking of the toner to a magnetic head can be prevented and a high quality image can be obtd. |
