Magnetic toner and image forming method

摘要

A magnetic toner is composed of a magnetic toner particle containing at least a binding resin and a magnetic material. The magnetic material is composed of a magnetic iron oxide containing 0.10% to 4.00% by weight of an element alpha belonging to the third period onwards in the long-period-type Periodic Table and having an electronegativity of 1.0 to 2.5. The solubility S1 of the element alpha in the magnetic material at an iron solubility of 0% to 20% lies in a range from 10% to less than 44%, the solubility S2 of the element alpha in the magnetic material at an iron solubility of 80% to 100% lies in a range from 5% to less than 30%. The magnetic material contains (i) 60% by number or more of a type of multinuclear magnetic iron oxide particle based on magnetic iron oxide particles, or (ii) 60% by number or more in total, based on magnetic iron oxide particles, of at least one type of magnetic iron oxide particle selected from the group consisting of polyhedral magnetic iron oxide particles having faces at ridgeline portions of hexahedron and polyhedral magnetic iron oxide particles having faces at ridgeline portions of octahedron, in combination with a type of multinuclear magnetic iron oxide particle. An image forming method includes a step of forming an electrostatic image on a latent image carrier and a step of developing the electrostatic image with a magnetic toner to form a magnetic toner image. <IMAGE>