Toner and method for producing the same

Patent metadata

Field	Value
Publication number	US-9235152-B2
Application number	US-201313835684-A
Country	US
Kind code	B2
Filing date	Mar 15, 2013
Priority date	Mar 30, 2012
Publication date	Jan 12, 2016
Grant date	Jan 12, 2016

Abstract

There is provided a toner, including toner mother particles which contain a binder resin, a colorant, and a wax, wherein a difference between a density of the wax in a solid state and a density of the wax in a liquid state is not less than 0.11 g/cm 3 ; the density of the wax in the liquid state is not more than 0.835 g/cm 3 ; and a heat quantity of the wax per unit mass which is obtained from an endothermic peak area at a low temperature side measured by a differential scanning calorimetry is not less than 190 mJ/mg.

First claim

What is claimed is:

1. A toner, comprising toner mother particles which contain a binder resin, a colorant, and a wax, wherein the wax is selected from the group consisting of stearic acid stearyl, stearic acid behenyl, heneicosanoic acid behenyl, dipentaerythritol hexamyristate, myristic acid behenyl, and combinations thereof;
wherein a difference between a density of the wax in a solid state at 24° C. and a density of the wax in a liquid state at 120° C. is not less than 0.11 g/cm 3 ;
the density of the wax in the liquid state at 120° C. is not more than 0.835 g/cm 3 ; and
a heat quantity of the wax per unit mass which is obtained from an endothermic peak area at a low temperature side measured by a differential scanning calorimetry is not less than 190 mJ/mg, and an anion equivalent of the toner mother particles is not more than 1×10 −5 mol/g and is more than 0 mol/g.

2. The toner according to claim 1 ,
wherein the binder resin is a polyester resin; and
the wax is an ester-based wax.

3. The toner according to claim 1 ,
wherein the wax includes the stearic acid behenyl.

4. The toner according to claim 1 ,
wherein the wax includes the heneicosanoic acid behenyl.

5. The toner according to claim 1 ,
wherein a difference calculated by subtracting anion equivalent from cation equivalent of the toner mother particles is −1.1×10 −5 to 1×10 −6 mol/g.

6. The toner according to claim 1 ,
wherein the difference between the density of the wax in the solid state at 24° C. and the density of the wax in the liquid state at 120° C. is not less than 0.133 g/cm 3 and not more than 0.145 g/cm 3 .

7. A method for producing a toner, comprising:
preparing an electrification control resin particle suspension in which electrification control resin particles are dispersed, by removing a first organic solvent from a first emulsion obtained such that an electrification control resin, the first organic solvent, and a first water base medium are blended to be emulsified;
preparing a mother particle suspension in which mother particles containing a binder resin, a colorant, and a wax are dispersed, by removing a second organic solvent from a second emulsion obtained such that the binder resin, the colorant, the wax, the second organic solvent, and a second water base medium are blended to be emulsified, wherein the wax is selected from the group consisting of stearic acid stearyl, stearic acid behenyl, heneicosanoic acid behenyl, dipentaerythritol hexamyristate, myristic acid behenyl, and combinations thereof;
preparing a toner mother particle suspension in which toner mother particles are dispersed, by heating the mother particle suspension to fuse and aggregate the mother particles to form the toner mother particles; and
mixing the electrification control resin particle suspension and the toner mother particle suspension,
wherein a difference between a density of the wax in a solid state at 24° C. and a density of the wax in a liquid state at 120° C. is not less than 0.11 g/cm 3 ;
the density of the wax in the liquid state at 120° C. is not more than 0.835 g/cm 3 ;
a heat quantity of the wax per unit mass which is obtained from an endothermic peak area at a low temperature side measured by a differential scanning calorimetry is not less than 190 mJ/mg; and
an anion equivalent of the toner mother particles is not more than 1×10 −5 mol/g and is more than 0 mol/g.

8. The method for producing the toner according to claim 7 , wherein a cation equivalent of the electrification control resin particles is 5.0×10 −6 to 5.0×10 −5 mol/g.

9. The method for producing the toner according to claim 7 ,
wherein the binder resin is a polyester resin; and
the wax is an ester-based wax.

10. The method for producing the toner according to claim 7 , wherein the wax includes stearic acid behenyl.

11. The method for producing the toner according to claim 7 , wherein the wax includes heneicosanoic acid behenyl.

12. A method for producing a toner, comprising:
preparing an electrification control resin particle suspension in which electrification control resin particles are dispersed, by removing a first organic solvent from a first emulsion obtained such that an electrification control resin, the first organic solvent, and a first water base medium are blended to be emulsified;
preparing a mother particle suspension in which mother particles containing a binder resin, a colorant, and a wax are dispersed, by removing a second organic solvent from a second emulsion obtained such that the binder resin, the colorant, the wax, the second organic solvent, and a second water base medium are blended to be emulsified, wherein the wax is selected from the group consisting of stearic acid stearyl, stearic acid behenyl, heneicosanoic acid behenyl, dipentaerythritol hexamyristate, myristic acid behenyl, and combinations thereof;
preparing a toner mother particle suspension in which toner mother particles are dispersed, by heating the mother particle suspension to fuse and aggregate the mother particles to form the toner mother particles; and
mixing the electrification control resin particle suspension and the toner mother particle suspension,
wherein a difference between a density of the wax in a solid state at 24° C. and a density of the wax in a liquid state at 120° C. is not less than 0.11 g/cm 3 ;
the density of the wax in the liquid state at 120° C. is not more than 0.835 g/cm 3 ;
a heat quantity of the wax per unit mass which is obtained from an endothermic peak area at a low temperature side measured by a differential scanning calorimetry is not less than 190 mJ/mg; an anion equivalent of the toner mother particles is not more than 1×10 −5 mol/g and is more than 0 mol/g; and
a difference calculated by subtracting anion equivalent from cation equivalent of the toner mother particles is −1.1×10 −5 to 1×10 −6 mol/g.

13. The method for producing the toner according to claim 12 , wherein a cation equivalent of the electrification control resin particles is 5.0×10 −6 to 5.0×10 −5 mol/g.

14. The method for producing the toner according to claim 12 ,
wherein the binder resin is a polyester resin; and
the wax is an ester-based wax.

15. The method for producing the toner according to claim 12 , wherein the wax includes stearic acid behenyl.

16. The method for producing the toner according to claim 12 , wherein the wax includes heneicosanoic acid behenyl.

Assignees

• Suzuki Kumiko
• Ikami Jun
• Brother Ind Ltd

Inventors

• Suzuki Kumiko
• Ikami Jun

Classifications

• G03G9/08755 Primary

  Polyesters · CPC title

• G03G9/0825

  characterised by their structure; characterised by non-homogenuous distribution of components (microcapsular toners G03G9/093) · CPC title

• G03G9/0804

  whereby the components are brought together in a liquid dispersing medium · CPC title

• G03G9/081

  by mixing the toner components in a liquefied state; melt kneading; reactive mixing · CPC title

• G03G9/08797

  characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature · CPC title