ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER AND IMAGE FORMING METHOD

Abstract

An object is to provide an electrostatic charge image developing toner and an image forming method using the same capable of maintaining image properties for a long duration, which exhibit not only sufficient transparency and chromaticness, accompanied with high color reproduction and excellent charging characteristic, but also excellent heat resistance, together further with excellent light fastness and sufficient image holding ability. Disclosed is an electrostatic charge image developing toner of the present invention comprising a binder resin for toner particle formation and colorant particles dispersed in the binder resin, wherein the colorant particles comprise a dye and an antioxidant. Further, the electrostatic charge image developing toner wherein a volume-based median particle diameter of the colorant particles is preferably 10-100 nm, and also the dye contained in the colorant particles is preferably an oil-soluble dye or a metal chelate dye.

Description

Claims

1. An electrostatic charge image developing toner comprising toner particles, each toner particle comprising colorant particles dispersed in a binder resin, wherein the colorant particles comprise a dye and an antioxidant.

2. The electrostatic charge image developing toner of claim 1, wherein a volume-based median particle diameter of the colorant particles is 10-100 nm.

3. The electrostatic charge image developing toner of claim 1, wherein a weight ratio of the antioxidant to the dye (antioxidant/dye) is in the range of 0.1/1-1/1.

4. The electrostatic charge image developing toner of claim 1, wherein the dye is an oil-soluble dye.

5. The electrostatic charge image developing toner of claim 1, wherein the dye is a metal chelate dye.

6. The electrostatic charge image developing toner of claim 1, wherein the colorant particles further comprise a dye medium resin differing in kind from the binder resin.

7. The electrostatic charge image developing toner of claim 6, wherein the colorant particles contain at least one dye medium resin.

8. The electrostatic charge image developing toner of claim 7, wherein the at least one dye medium resin has a weight average molecular weight (Mw) of at least 500 and less than 40,000.

9. The electrostatic charge image developing toner of claim 1, wherein the antioxidant comprises a compound represented by the following Formula (A) or (B).

10. An image forming method employing the electrostatic charge image developing toner of claim 1, comprising the steps of: (a) developing an electrostatic charge image formed on an electrostatic charge image carrier with the electrostatic charge image developing toner; and(b) transferring a toner image formed in step (a) onto an image recording medium.