| 摘要 |
PURPOSE:To decrease the staining of a magnetic head and to obtain a high- density image by fixing a PE resin having the mol.wt. of a specific range onto the surface of toner particles contg. a thermoplastic resin and magnetic powder. CONSTITUTION:This magnetic toner is used to obtain the final image by transferring a magnetic latent image after development, then subjecting the same to heat roll fixing. Such toner is formed by fixing the PE resin having the mol.wt. in a 1,500-12,000 range to the surface of the toner particles contg. the thermoplastic resin and magnetic powder. The toner sticks transiently to the magnetic head when the magnetic latent image is developed by using the magnetic toner fixed with the PE resin on the surface. Since the PE has the property to solidify and shrink on cooling, the toner peels off easily and does no longer stick to the magnetic head. The PE is too soft and the flocculation of the toner does not arise if the mol.wt. of the PE resin is below 1,500. The PE is too hard and the fixing is difficult if the mol.wt. exceeds 12,000. |
