Electrostatic latent image toner, and manufacture thereof, and electrostatic image developer, and image forming method
View Patent ↗An electrostatic latent image toner in which the quantity within the toner of alkyl carboxylate esters formed from a carboxylic acid containing from approximately 3 to 5 carbon atoms and an alkyl group containing from approximately 3 to 5 carbon atoms is no more than approximately 4 ppm.
1. An electrostatic latent image toner, comprising resin particles, colorant particles and release agent particles, wherein a quantity within the toner of alkyl carboxylate esters formed from a carboxylic acid containing from approximately 3 to 5 carbon atoms and an alkyl group containing from approximately 3 to 5 carbon atoms is no more than approximately 4 ppm and the resin of the resin particles is formed by polymerizing a polymerizable monomer having a vinyl-based double bond.
2. The electrostatic latent image toner according to claim 1 , wherein the carboxylic acid is propionic acid.
3. An image forming method, comprising: charging a latent image holding member and a surface of the latent image holding member; forming a latent image on the charged surface of the latent image holding member; developing the latent image; transferring the developed toner image to a recording medium; and fixing the toner image on the recording medium, wherein the method uses the electrostatic latent image toner according to claim 2 .
4. The electrostatic latent image toner according to claim 1 , wherein the electrostatic latent image toner comprises a release agent, the release agent has a subjective maximum endothermic peak, measured in accordance with ASTM D3418-8, within a range from approximately 60 to 120° C., and a melt viscosity at 140° C. within a range from approximately 1 to 50 mPas.
5. The electrostatic latent image toner according to claim 1 , wherein a quantity of the release agent added to the electrostatic latent image toner is within a range from approximately 5 to 40% by weight.
6. The electrostatic latent image toner according to claim 1 , wherein a shape factor SF 1 is within a range from approximately 115 to 140.
7. The electrostatic latent image toner according to claim 1 , wherein an acid value of a primary component resin is within a range from approximately 5 to 50 mgKOH/g.
8. The electrostatic latent image toner according to claim 1 , wherein when the toner is measured using gel permeation chromatography, a molecular weight distribution represented by a ratio (Mw/Mn) between a weight average molecular weight (Mw) and a number average molecular weight (Mn) is within a range from approximately 2 to 30.
9. A method of manufacturing an electrostatic latent image toner according to claim 1 , the method comprising: bringing a polymerizable monomer having a vinyl-based double bond into contact with a porous material; and producing a resin particle dispersion by polymerizing, in a water-based solvent, a polymerizable monomer that comprises the polymerizable monomer having a vinyl-based double bond, wherein
the resin particle dispersion, a colorant particle dispersion produced by dispersing a colorant, and a release agent particle dispersion produced by dispersing a release agent are mixed together, and following formation of aggregate particles through aggregation of the resin particles, the colorant particles and the release agent particles, heating is conducted to fuse the aggregate particles and produce the electrostatic latent image toner.
10. An image forming method, comprising: charging a latent image holding member and a surface of the latent image holding member; forming a latent image on the charged surface of the latent image holding member; developing the latent image; transferring the developed toner image to a recording medium; and fixing the toner image on the recording medium, wherein the method uses the electrostatic latent image toner according to claim 1 .
11. An electrostatic image developer, comprising an electrostatic latent image toner and a carrier, wherein the electrostatic latent image toner comprises resin particles, colorant particles and release agent particles, and wherein a quantity of alkyl carboxylate esters formed from a carboxylic acid containing from approximately 3 to 5 carbon atoms and an alkyl group containing from approximately 3 to 5 carbon atoms in the electrostatic latent image toner is no more than approximately 4 ppm.
12. The electrostatic image developer according to claim 11 , wherein the carrier comprises a resin for which a weight average molecular weight of a tetrahydrofuran soluble fraction is approximately 30,000 or greater, and a component of the resin for which a weight average molecular weight is 10,000 or less is no higher than approximately 30%.
13. The electrostatic image developer according to claim 11 , wherein an electrical resistance of the carrier is within a range from approximately 10 8 to 10 14 Ωcm.
14. The electrostatic image developer according to claim 11 , wherein the carrier comprises a conductive powder.
15. The electrostatic image developer according to claim 14 , wherein an electrical resistance of the conductive powder is no higher than approximately 10 8 Ωcm.
16. The electrostatic image developer according to claim 14 , wherein the conductive powder is carbon black.
17. The electrostatic image developer according to claim 16 , wherein an absorption quantity for the carbon black is within a range from approximately 50 to 300 ml/100 g.