Importance

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Abstract

A two-component developer includes a carrier containing carrier particles and a toner containing toner particles. The carrier particles include carrier cores and coat layers covering the surfaces of the carrier cores. The coat layers contain silicone resin. The carrier particles have surfaces with a static friction coefficient of at least 0.10 and no greater than 0.22. The toner particles include toner mother particles and an external additive attached to the surfaces of the toner mother particles. The external additive includes resin particles. The resin particles have a number average primary particle diameter of at least 35 nm and no greater than 160 nm. The resin particles have a blocking rate of at least 17% by mass and no greater than 42% by mass, as measured using a mesh sieve with an opening of 75 μm after 5-minite pressure application at a temperature of 160° C. and a pressure of 0.1 kgf/mm².

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First Claim