Electrostatic-image developing toner, electrostatic image developer, and toner cartridge

1. An electrostatic-image developing toner comprising toner particles containing a polyester resin having an acid value of from 10 mg KOH/g to less than 15 mg KOH/g, wherein

the toner particles have a surface with an acid value in a range from 0.3% to 1.7% of the acid value of the polyester resin,

the toner particles have a melt viscosity of from 1,800 Pa·s to 3,800 Pa·s at 100° C., and

the toner particles contain Na in an amount of from 0.05% by mass to 0.25% by mass based on a mass of the toner particles.

2. The electrostatic-image developing toner according to claim 1 , wherein Na is present in an amount of from 0.10% by mass to 0.20% by mass based on the mass of the toner particles.

3. The electrostatic-image developing toner according to claim 1 , wherein the toner particles contain S in an amount of from 0.06% by mass to 0.15% by mass based on a mass of the toner particles.

4. The electrostatic-image developing toner according to claim 1 , wherein the toner particles contain Al in an amount of from 0.01% by mass to 0.03% by mass based on a mass of the toner particles.

5. The electrostatic-image developing toner according to claim 1 , wherein the polyester resin has a weight average molecular weight (Mw) of from 5,000 to 1,000,000.

6. The electrostatic-image developing toner according to claim 1 , wherein the polyester resin has a molecular weight distribution Mw/Mn of from 1.5 to 100.

7. The electrostatic-image developing toner according to claim 1 , wherein the toner particles contain a release agent having a melting temperature of from 50° C. to 110° C.

8. The electrostatic-image developing toner according to claim 1 , wherein the toner particles have an average circularity of from 0.94 to 1.00.

9. An electrostatic image developer comprising the electrostatic-image developing toner according to claim 1 .

10. A toner cartridge attachable to and detachable from an image-forming apparatus, the toner cartridge containing the electrostatic-image developing toner according to claim 1 .

11. An electrostatic-image developing toner comprising toner particles containing a polyester resin having an acid value of from 10 mg KOH/g to less than 15 mg KOH/g, wherein

the toner particles have a surface with an acid value in a range from 0.3% to 1.7% of the acid value of the polyester resin,

the toner particles have a glass transition temperature (Tg) of from 30° C. to 55° C., and

the toner particles contain Na in an amount of from 0.05% by mass to 0.25% by mass based on a mass of the toner particles.

12. The electrostatic-image developing toner according to claim 11 , wherein Na is present in an amount of from 0.10% by mass to 0.20% by mass based on the mass of the toner particles.

13. The electrostatic-image developing toner according to claim 11 , wherein the toner particles contain S in an amount of from 0.06% by mass to 0.15% by mass based on a mass of the toner particles.

14. The electrostatic-image developing toner according to claim 11 , wherein the toner particles contain Al in an amount of from 0.01% by mass to 0.03% by mass based on a mass of the toner particles.

15. The electrostatic-image developing toner according to claim 11 , wherein the polyester resin has a weight average molecular weight (Mw) of from 5,000 to 1,000,000.

16. The electrostatic-image developing toner according to claim 11 , wherein the polyester resin has a molecular weight distribution Mw/Mn of from 1.5 to 100.

17. The electrostatic-image developing toner according to claim 11 , wherein the toner particles contain a release agent having a melting temperature of from 50° C. to 110° C.

18. The electrostatic-image developing toner according to claim 11 , wherein the toner particles have an average circularity of from 0.94 to 1.00.