ELECTROSTATIC IMAGE DEVELOPING TONER

Abstract

A toner comprising: (i) toner particles, each toner particle comprising a binder resin and a colorant; and (ii) an oxymonocarboxylic acid or a salt thereof, wherein a total content of the oxymonocarboxylic acid or the salt thereof in the toner is 10 to 173 ppm based on the total weight of the toner.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic sectional view showing an example of a non-magnetic single-component developer processor.

FIG. 2 is a schematic sectional view showing an example of a full-color image forming apparatus which forms images employing the toner of the present invention.

Claims

1. A toner comprising: (i) toner particles, each toner particle comprising a binder resin and a colorant; and(ii) an oxymonocarboxylic acid or a salt thereof,wherein a total content of the oxymonocarboxylic acid or the salt thereof in the toner is 10 to 173 ppm based on the total weight of the toner.

2. The toner of claim 1, wherein: (a) a content of sodium in the toner is 1 to 134 ppm based on the total weight of the toner; and(b) a content of a divalent or a trivalent metal element in the toner is 300 to 1800 ppm based on the total weight of the toner.

3. The toner of claim 1, wherein: the amount an oxymonocarboxylic acid or a salt thereof is 20-120 ppm.

4. The toner of claim 1, wherein: the molecular weight of the oxymonocarboxylic acid is 47 to 1,500.

5. The toner of claim 1, wherein: the molecular weight of the oxymonocarboxylic acid is 60 to 1,000.

6. The toner of claim 1, wherein: the oxymonocarboxylic acid has one carboxyl group and at least one hydroxyl group in one molecule, and the number of carbon atoms is from 2 to 12.

7. The toner of claim 1, wherein: the oxymonocarboxylic acid is represented by Formula (OM): HO—R—COOH,  Formula (OM)wherein R is a substituted or unsubstituted alkylene group; or a substituted or unsubstituted arylene group.

8. The toner of claim 7, wherein: the amount an oxymonocarboxylic acid or a salt thereof is 20-120 ppm.

9. The toner of claim 1, having a variation coefficient in the volume based size distribution of the toner particles of 8 to 21%.

10. The toner of claim 1, having an average circularity of the toner particles being 0.951-0.990, wherein the average circularity is defined by the following formula; Circularity=(circumferential length of a circle having the same projective area as that of a particle image)/(circumferential length of the projective particle image).

11. A non-magnetic single component toner comprising the toner of claim 1.