TWO-COMPONENT DEVELOPER, DEVELOPMENT DEVICE AND IMAGE FORMATION APPARATUS

摘要

A two-component developer includes a toner and carriers. A softening temperature of the toner in a ½ method test is not less than 106° C. but is less than 112° C., surface free energy of resin coating layers of the carriers is set at 12 mN/m. If the toner softening temperature in the ½ method test is not less than 112° C. but is less than 115° C., the surface free energy is set at not greater than 15 mN/m. If the toner softening temperature in the ½ method test is not less than 115° C. but is less than 126° C., the surface free energy is set at not greater than 20 mN/m. If the toner softening temperature in the ½ method test is not less than 126° C. but not greater than 130° C., the surface free energy is set at not greater than 40 mN/m.

主权项

1. A two-component developer comprising:
a toner; and carriers, wherein a softening temperature of the toner in a ½ method test is not less than 106° C. but is less than 112° C., and surface free energy of resin coating layers of the carriers is set at 12 mN/m, the softening temperature of the toner in the ½ method test is not less than 112° C. but is less than 115° C., and the surface free energy of the resin coating layers of the carriers is set at not greater than 15 mN/m, the softening temperature of the toner in the ½ method test is not less than 115° C. but is less than 126° C., and the surface free energy of the resin coating layers of the carriers is set at not greater than 20 mN/m, or the softening temperature of the toner in the ½ method test is not less than 126° C. but not greater than 130° C., and the surface free energy of the resin coating layers of the carriers is set at not greater than 40 mN/m.