Toner for developing electrostatic images and developer
A toner includes an amorphous resin; and a crystalline polyester resin dispersed in the amorphous resin. The crystalline polyester resin has a volume-average particle diameter (Dv) of from 0.07 to 0.20 μm, and a ratio (Dv/Dn) of the volume-average particle diameter (Dv) to a number-average particle diameter (Dn) thereof of from 1.00 to 2.25.
1. A toner, comprising:
an amorphous resin; and
a crystalline polyester resin dispersed in the amorphous resin,
wherein the crystalline polyester resin is present in a micro crystalline polyester resin phase, and
wherein the crystalline polyester resin has a volume-average particle diameter (Dv) of from 0.07 to 0.20 μm, and a ratio (Dv/Dn) of the volume-average particle diameter (Dv) to a number-average particle diameter (Dn) thereof of from 1.00 to 2.25.
2. The toner of claim 1 , wherein the toner has a ratio (Pv/Pn) of a volume-average particle diameter (Pv) thereof to a number-average particle diameter (Pn) thereof of from 1.00 to 1.28.
3. The toner of claim 2 , wherein the toner has a spin-spin relaxation time (T2) of from 0.20 to 2.00 msec at 90° C. when subjected to Hahn echo method of NMR analysis.
4. The toner of claim 1 , wherein the toner has a log G′ of a storage elastic modulus (Pa) at 100° C. of from 3.5 to 4.5 in a dynamic viscoelasticity measured at a temperature sweep (swept from 40° C.), a frequency of 1 Hz, a distortion quantity control of 0.1%, and a programming rate of 2° C./min).
5. A two-component developer, comprising the toner according to claim 1 and a magnetic carrier.
6. The toner of claim 1 , which comprises 10% to 85% by weight of the crystalline polyester resin.
7. The toner of claim 1 , wherein the amorphous resin is a polyester resin.
8. The toner of claim 1 , wherein the amorphous resin comprises a modified polyester resin and an unmodified polyester resin.
9. The toner of claim 1 , wherein the ratio (Dv/Dn) of the volume-average particle diameter (Dv) to a number-average particle diameter (Dn) thereof is from 1.84 to 2.25.
10. The toner of claim 1 , wherein the ratio (Dv/Dn) of the volume-average particle diameter (Dv) to a number-average particle diameter (Dn) thereof is from 1.71 to 2.25.
11. The toner of claim 1 , wherein the toner has a glass transition temperature of 40° C. to 70° C.
12. The toner of claim 1 , wherein the toner has a ratio (Pv/Pn) of a volume-average particle diameter (Pv) thereof to a number-average particle diameter (Pn) thereof of from 1.00 to 1.20.
13. The toner of claim 1 , wherein the crystalline resin has a melting point of 50° C. to 100° C.
14. The toner of claim 1 , further comprising resin particles.
15. The toner of claim 1 , wherein the crystalline polyester resin has a weight average molecular weight (Mw) of 6,000 to 35,000.
16. The toner of claim 1 , wherein the crystalline polyester resin comprises a crystalline aliphatic polyester resin.
17. A toner, comprising:
an amorphous resin; and
a crystalline polyester resin dispersed in the amorphous resin,
wherein the crystalline polyester resin has a volume-average particle diameter (Dv) of from 0.07 to 0.20 μm, and a ratio (Dv/Dn) of the volume-average particle diameter (Dv) to a number-average particle diameter (Dn) thereof of from 1.00 to 2.25; and
wherein the toner has a spin-spin relaxation time (T2) of from 0.20 to 2.00 msec at 90° C. when subjected to Hahn echo method of NMR analysis.
18. The toner of claim 17 , wherein the crystalline polyester resin is present in a micro crystalline polyester resin phase.