Toner, developer, and color toner set

1. A toner, comprising:

a binder resin; and

a colorant;

wherein:

the toner has a storage modulus of 1.0×10 7 Pa or more at 50° C., a loss modulus of 8.0×10 4 Pa to 2.0×10 5 Pa at 80° C., and a loss modulus of 2.0×10 2 Pa to 1.0×10 3 Pa at 160° C.; and

the toner has a glass transition temperature (Tglst) of 20° C. to 38° C. at a first temperature rise in differential scanning calorimetry (DSC).

2. The toner according to claim 1 , wherein the binder resin comprises:

an amorphous polyester resin A which is obtained by a reaction of a non-linear reactive precursor with a curing agent and has a glass transition temperature of 60° C. to 0° C.;

an amorphous polyester resin B having a glass transition temperature of 40° C. to 70° C.; and

a crystalline polyester resin C.

3. The toner according to claim 1 ,

wherein the toner has a core-shell structure comprising a core and a shell, and

wherein the shell has a glass transition temperature of 50° C. to 100° C.

4. The toner according to claim 3 ,

wherein:

the core comprises:

an amorphous polyester resin A which is obtained by a reaction of a non-linear reactive precursor with a curing agent and has a glass transition temperature of −60° C. to 0° C.;

an amorphous polyester resin B having a glass transition temperature of 40° C. to 70° C.; and

a crystalline polyester resin C;

the shell is incompatible with the amorphous polyester resin A;

the shell is incompatible with the amorphous polyester resin B; and

the shell is incompatible with the crystalline polyester resin C.

5. The toner according to claim 3 ,

wherein the shell is formed of fine particles of an acrylic resin.

6. The toner according to claim 1 ,

wherein the colorant comprises a yellow pigment, a magenta pigment or a cyan pigment.

7. A color toner set, comprising:

two or more selected from the group consisting of:

a yellow toner, a magenta toner, and a cyan toner,

wherein the yellow toner comprises a binder resin and a yellow pigment, the yellow toner has a storage modulus of 1.0×10 7 Pa or more at 50° C., a loss modulus of 8.0×10 4 Pa to 2.0×10 5 Pa at 80° C., and a loss modulus of 2.0×10 2 Pa to 1.0×10 3 Pa at 160° C., and the yellow toner has a glass transition temperature (Tg1st) of 20° C. to 38° C. at a first temperature rise in differential scanning calorimetry (DSC);

wherein the magenta toner comprises a binder resin and a magenta pigment, the magenta toner has a storage modulus of 1.0×10 7 Pa or more at 50° C., a loss modulus of 8.0×10 4 Pa to 2.0×10 5 Pa at 80° C., and a loss modulus of 2.0×10 2 Pa to 1.0×10 3 Pa at 160° C., and the magenta toner has a glass transition temperature (Tg1st) of 20° C. to 38° C. at a first temperature rise in differential scanning calorimetry (DSC); and

wherein the cyan toner comprises a binder resin and a cyan pigment, the cyan toner has a storage modulus of 1.0×10 7 Pa or more at 50° C., a loss modulus of 8.0×10 4 Pa to 2.0×10 5 Pa at 80° C., and a loss modulus of 2.0×10 2 Pa to 1.0×10 3 Pa at 160° C., and the cyan toner has a glass transition temperature (Tg1st) of 20° C. to 38° C. at a first temperature rise in differential scanning calorimetry (DSC).

8. The color toner set according to claim 7 ,

wherein the magenta toner, the cyan toner, or both thereof comprise a fluorescent brightening agent.

9. A developer, comprising:

the toner according to claim 1 .

10. The toner according to claim 1 , wherein the toner comprises an amorphous polyester resin B which is an unmodified linear polyester resin and which has a glass transition temperature of 40° C. to 70° C.

11. A toner, comprising:

a binder resin;

a colorant; and

a fluorescent brightening agent;

wherein:

the toner has a storage modulus of 1.0×10 7 Pa or more at 50° C., a loss modulus of 8.0×10 4 Pa to 2.0×10 5 Pa at 80° C., and a loss modulus of 2.0×10 2 Pa to 1.0×10 3 Pa at 160° C.; and

the toner has a glass transition temperature (Tg1st) of 20° C. to 38° C. at a first temperature rise in differential scanning calorimetry (DSC).