JP2007114766A5 - - Google Patents

Claims (3)

A developer for developing an electrostatic image containing toner particles and a carrier,
The toner particles have a particle size distribution represented by the following formula (1) of 1.3 or less,
The carrier density of 4g / cm ³ or more 8 g / cm ³ or less, the total amount of energy in the powder rheometer and measured by the following conditions Ru 1000~2000mJ der,
Electrostatic image developer, wherein the this.
Equation (1): particle size distribution _{= {(D 84p / D 50p} ) + (D 50p / D 16p)} / 2
[In the formula, D _84p represents the particle size that is accumulated 84% from the small particle size _side in the number cumulative particle size distribution, D _50p represents the particle size that accumulated 50%, and D _16p represents the particle that accumulated 16%. Represents the diameter. ]
Measurement conditions of powder rheometer:
Tip speed of rotor blade 100mm / sec, approach angle of rotor blade -10 °   A developer for developing an electrostatic image containing toner particles and a carrier,
  The toner particles have a particle size distribution represented by the following formula (1) of 1.3 or less,
  The carrier has a density of 2 g / cm. ³ 4 g / cm or more ³ The total energy amount with a powder rheometer measured under the following conditions is 800-1800 mJ.
  A developer for developing an electrostatic charge image.
  Formula (1): Particle size distribution = {(D _84p / D _50p ) + (D _50p / D _16p )} / 2
[Where D _84p Represents the particle size that is 84% cumulative from the small particle size side in the cumulative particle size distribution, and D _50p Represents the particle size of cumulative 50%, D _16p Represents a particle size of cumulative 16%. ]
  Measurement conditions of powder rheometer:
        Tip speed of rotor blade 100mm / sec, approach angle of rotor blade -10 ° A charging step for charging the latent image carrier;
Exposing the charged latent image carrier to form an electrostatic latent image on the latent image carrier; and
A developing step of developing the electrostatic latent image with a developer containing toner and a carrier to form a toner image;
A transfer step of transferring the toner image from the latent image carrier to a recording material,
The developer comprises an electrostatic charge image developer according to claim 1 or claim 2,
In the developing step, the developer carrying member carrying the developer on the surface rotates at a peripheral speed of 100 mm / sec or more and 800 mm / sec or less to face the image carrying member, and the developer is applied to the image carrying member. An image forming method comprising a conveying step.