JP2005157342A5

JP2005157342A5 -

Info

Publication number: JP2005157342A5
Application number: JP2004320410A
Authority: JP
Filing date: 2004-11-04
Publication date: 2009-09-24
Anticipated expiration: 2024-11-04

Claims

A yellow toner containing a binder resin and a colorant,
The binder resin contains at least a polyester unit;
A yellow toner having a lightness L ^* in a powder state of L ^* > 87 and a chromaticity b ^* of 106 <b ^* <120.

The yellow toner according to claim 1, wherein the colorant includes a monoazo pigment.

The colorant is C.I. I. The yellow toner according to claim 1, comprising Pigment Yellow 74.

The colorant has a median particle size D of 40 to 100 nm or less and a particle frequency D150 having a particle size of 150 nm or more in a particle size distribution based on the number of colorants when the binder resin and the colorant are mixed. The yellow toner according to claim 1, wherein the yellow toner is 1% or less.

Image carrier that carries an electrostatic latent image, a charging means for charging the image bearing member, latent image forming means for forming an electrostatic latent image on an image bearing member charged by the charging means, the formed electrostatic An image forming apparatus having at least developing means for developing a toner image by developing a yellow toner for developing an electrostatic latent image and an electrostatic latent image formed on an image carrier,
It said developing means has a developing unit A for developing with the yellow toner, a developing unit B for developing with a toner other than the yellow toner, and a developing bias supplying means for applying a developing bias at the time of development,
The development bias at the time of development by the development means A and the development bias at the time of development by the development means B are applied by a common development bias supply means,
The yellow toner contains a binder resin and a colorant, the binder resin contains at least a polyester unit, the lightness L ^* in the powder state satisfies L ^* > 87, and the chromaticity b ^* is 106 <. An image forming apparatus that is yellow toner satisfying b ^* <120.

Image carrier that carries an electrostatic latent image, a charging means for charging the image bearing member, latent image forming means for forming an electrostatic latent image on an image bearing member charged by the charging means, the formed electrostatic yellow toner, a developing means for forming a yellow toner image by developing the electrostatic latent image formed on the image bearing member by said yellow toner, a transfer to be transferred to a transfer material the yellow toner image for developing the electrostatic latent image An image forming apparatus having a fixing unit that heats and fixes the yellow toner image on a transfer material, and a rotation heating member and a rotation pressure member that presses the rotation heating member.
In the fixing unit, the rotary pressure member is pressed against the rotary heating member with a linear pressure of 490 to 980 N / m through the transfer material,
The yellow toner contains a binder resin and a colorant, the binder resin contains at least a polyester unit, the lightness L ^* in the powder state satisfies L ^* > 87, and the chromaticity b ^* is 106 <. An image forming apparatus that is yellow toner satisfying b ^* <120.