TWO-COMPONENT DEVELOPER, REPLENISHING DEVELOPER AND IMAGE FORMING METHOD Russian patent published in 2011 - IPC G03G9/09 

FIELD: physics.

SUBSTANCE: two-component developer contains blue toner having particles, each containing resin binder, a dye, an external additive and a magnetic carrier. The blue toner has the following characteristics: (i) when concentration of blue toner in the solution of blue toner in chloroform is given as Cc (mg/ml), and optical density of the solution at wavelength 712 nm is given as A712, the ratio of Cc to A712 satisfies the inequality 2.00<A712/Cc<8.15, (ii) lightness L* and saturation C* of the colour of the blue toner, measured in powdered state, satisfy the inequalities: 25.0≤L*≤40.0 and 50.0≤C*≤60.0; (iii) the absolute value of the amount of the triboelectric charge of the blue toner, measured using a two-component technique using blue toner and a magnetic carrier, is equal to 50 mC/kg or higher and 120 mC/kg or lower.

EFFECT: possibility of obtaining a high-resolution image with a lower level of applying toner than usually, possibility of maintaining high rate of printing and possibility of constantly forming an image with stable colour toner even during prolonged use.

34 cl, 17 dwg