Patent ID: 8822119
Filing Date: 2014-09-02
Classification: G03G

Abstract:
1. A developer, comprising: a toner, said toner comprising a mixture of solid particles, said mixture of solid particles comprising a coloring particle and two additive particles, said two additive particles being a hydrophobic silica particle and an inorganic hydrotalcite analogue particle; and a carrier comprising a magnetic particle and a silicone resin layer, said silicone resin layer comprising a charge control agent; wherein: said two additive particles are external to said coloring particle; said coloring particle is prepared by fusing first polymer particles and second polymer particles, wherein said first polymer particles comprise a wax and said second polymer particles comprise a colorant; said two additive particles are present in the following weight percentages with respect to said toner: 0.2-2.0 wt. % of said hydrophobic silica particle and 0.01-1.0 wt. % of said inorganic hydrotalcite analogue particle; said hydrophobic silica particle has an average particle diameter of between 5 and 100 nm; said inorganic hydrotalcite analogue particle has an average particle diameter of between 10 and 1000 nm; said toner has a shape coefficient of 0.93-0.99; said magnetic particle is coated with said silicone resin layer; said charge control agent is selected from salicylic acid metal complex, azo metal complex, and quaternary ammonium salt charge control agent; and said carrier has an average particle diameter of 20-100 μm.