Toner for developing electrostatic charge image, developer for developing an electrostatic charge image, toner cartridge, process cartridge, and image forming apparatus
View Patent ↗A toner for developing an electrostatic charge image, the toner including a binder resin containing a crystalline polyester resin and a noncrystalline polyester resin, a colorant, a releasing agent, a ketone solvent, and an alcoholic solvent, the total concentration of the ketone solvent and the alcoholic solvent in the toner dispersion liquid being less than about 10 ppm when 0.5 g of the toner is dispersed in 2 g of deionized water to form a toner dispersion liquid, and the total concentration of the ketone solvent and the alcoholic solvent in the toner dispersion liquid being from about 2 ppm to about 50 ppm when 0.5 g of the toner is dispersed in 2 g of N,N-dimethylformamide to form a toner dispersion liquid.
1. A toner for developing an electrostatic charge image,
the toner comprising a binder resin containing a crystalline polyester resin and a noncrystalline polyester resin, a colorant, a releasing agent, a ketone solvent, and an alcoholic solvent,
the total concentration of the ketone solvent and the alcoholic solvent in a first toner dispersion liquid being less than about 10 ppm when 0.5 g of the toner is dispersed in 2 g of deionized water to form the first toner dispersion liquid, and
the total concentration of the ketone solvent in a second toner dispersion liquid being from about 1 ppm to about 8 ppm, and the total concentration of the ketone solvent and the alcoholic solvent in the second toner dispersion liquid being from about 2 ppm to about 50 ppm, when 0.5 g of the toner is dispersed in 2 g of N,N-dimethylformamide to form the second toner dispersion liquid, wherein
the first and second toner dispersion liquids are left to stand at 20° C. for 24 hours.
2. The toner for developing an electrostatic charge image of claim 1 , wherein the concentration of the alcoholic solvent in the second toner dispersion liquid is from about 1 ppm to about 49 ppm.
3. The toner for developing an electrostatic charge image of claim 1 , wherein the content of the crystalline polyester resin with respect to the total amount of the binder resin is from about 1% by weight to about 20% by weight.
4. The toner for developing an electrostatic charge image of claim 1 , wherein the ketone solvent is selected from the group consisting of acetone, methyl ethyl ketone, and diethyl ketone.
5. The toner for developing an electrostatic charge image of claim 1 , wherein the ketone solvent is methyl ethyl ketone.
6. The toner for developing an electrostatic charge image of claim 1 , wherein the alcoholic solvent is selected from the group consisting of methanol, ethanol, propanol, isopropanol, and butanol.
7. The toner for developing an electrostatic charge image of claim 1 , wherein the alcoholic solvent is isopropanol.
8. The toner for developing an electrostatic charge image of claim 1 , wherein the ketone solvent is methyl ethyl ketone or acetone and the alcoholic solvent is isopropanol or ethanol.
9. A developer for developing an electrostatic charge image, the developer comprising the toner for developing an electrostatic charge image of claim 1 .
10. The toner for developing an electrostatic charge image of claim 1 , wherein the ketone solvent is acetone or methyl ethyl ketone.