TWO-COMPONENT DEVELOPER, DEVELOPMENT DEVICE AND IMAGE FORMATION APPARATUS
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United States of America Patent
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Issued Date -
Sep 22, 2016
app pub date -
Feb 12, 2016
filing date -
Feb 12, 2016
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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.
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