Dry toner
A dry toner is provided that is prepared by a method including the steps of (A) dissolving or dispersing a toner composition in an organic solvent to prepare a toner composition liquid and (B) dispersing the toner composition liquid in an aqueous liquid which contains a binder resin formed of a modified polyester (i) and a colorant containing a carbon black having a pH not greater than 7, wherein the toner has a volume average particle diameter (Dv) is from 3 to 7 μm and a ratio of the volume average particle diameter (Dv) to a number average particle diameter (Dp) is from 1.00 to 1.25.
1. A dry toner prepared by a method comprising:
(A) dissolving or dispersing a toner composition in an organic solvent to prepare a toner composition liquid; and
(B) dispersing the toner composition liquid in an aqueous liquid to form a dispersion, wherein the dispersion comprises:
a binder resin comprising a modified polyester (i); and
a colorant comprising a carbon black, wherein the carbon black has a pH not greater than 7,
wherein the toner has a volume average particle diameter (Dv) of from 3 to 7 μm and a ratio (Dv/Dp) of the volume average particle diameter (Dv) to a number average particle diameter (Dp) of from 1.00 to 1.25, wherein the toner has a spindle shape;
wherein the binder resin further comprises an unmodified polyester (ii);
wherein the unmodified polyester (ii) has a peak molecular weight of from 1000 to 30000; and
wherein the unmodified polyester (ii) has a glass transition temperature (Tg) of from 35 to 55° C.
2. The dry toner according to claim 1 , wherein the toner composition comprises a prepolymer and wherein the modified polyester (i) is formed by the prepolymer in either or both of steps (A) and (B).
3. The dry toner according to claim 1 , wherein the colorant is a master batch in which the carbon black is dispersed in a master batch resin.
4. The dry toner according to claim 3 , wherein the master batch resin is a polyester resin.
5. The dry toner according to claim 1 , wherein a weight ratio (i/ii) of the modified polyester (i) to the unmodified polyester (ii) is from 5/95 to 80/20.
6. The dry toner according to claim 1 , wherein the unmodified polyester (ii) has an acid value of from 1 to 15 mgKOH/g.
7. The dry toner according to claim 1 , wherein the spindle shape has a ratio (r2/r1) of a minor axis particle diameter (r2) to a major axis particle diameter (r1) of from 0.5 to 0.8 and has a ratio (r3/r2) of a thickness (r3) to the minor axis particle diameter (r2) of from 0.7 to 1.0.
8. A two-component developer comprising the dry toner according to claim 1 and a carrier.
9. A toner container having therein the dry toner according to claim 1 .
10. A dry toner comprising toner particles comprising:
a binder resin comprising a modified polyester resin; and
a colorant comprising a carbon black, wherein the carbon black has a pH not greater than 7,
wherein the toner has a volume average particle diameter (Dv) of from 3 to 7 μm and a ratio (Dv/Dp) of the volume average particle diameter (Dv) to a number average particle diameter (Dp) of from 1.00 to 1.25, wherein the toner has a spindle shape;
wherein the binder resin further comprises an unmodified polyester (ii);
wherein the unmodified polyester (ii) has a peak molecular weight of from 1000 to 30000; and
wherein the unmodified polyester (ii) has a glass transition temperature (Tg) of from 35 to 55° C.
11. A method for manufacturing a toner composition comprising toner particles according to claim 10 , comprising:
dissolving or dispersing a toner composition in an organic solvent to form a toner composition liquid;
dispersing the toner composition liquid in an aqueous liquid to prepare a dispersion;
wherein said dispersion comprises said binder resin comprising said modified polyester resin and said carbon black which has a pH of not greater than 7.
12. The dry toner according to claim 10 , wherein a weight ratio (i/ii) of the modified polyester (i) to the unmodified polyester (ii) is from 5/95 to 80/20.