Process for producing resin particle liquid dispersion for electrostatic image developing toner, electrostatic image developing toner and production process thereof

• US 20060263709A1
• Filed: 09/21/2005
• Published: 11/23/2006
• Est. Priority Date: 05/19/2005
• Status: Active Grant

• Current Assignee: Fuji Xerox Company Limited (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Xerox Company Limited (Fujifilm Holdings Corporation)
• Inventors: Maehata, Hideo, Mera, Fumiaki, Hiraoka, Satoshi, Sasaki, Yuki, Matsumura, Yasuo, Matsuoka, Hirotaka
• Granted Patent: US 7,695,886 B2
• Time in Patent Office: Days
• US Class Current: 430/105
• CPC Class Codes: G03G 9/0804 whereby the components are brought together in a liquid dispersing medium
• CPC Class Codes: G03G 9/0819 characterised by the dimensions of the particles
• CPC Class Codes: G03G 9/0827 characterised by their shape, e.g. degree of sphericity
• CPC Class Codes: G03G 9/08755 Polyesters
• CPC Class Codes: G03G 9/08795 characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants
• CPC Class Codes: G03G 9/08797 characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature

Abstract

A process for producing a resin particle liquid dispersion for an electrostatic image developing toner, the process comprising: polycondensing a polycondensable monomer by utilizing an acid having a surface activating effect as a polycondensation catalyst, so as to obtain a polycondensed resin; and dispersing the polycondensed resin in an aqueous medium to which a base is added, so as to obtain a resin particle liquid dispersion in which a median diameter of resin particles is from 0.05 to 2.0 μm, or the process comprising: polycondensing a polycondensable monomer by utilizing an acid having a surface activating effect as a polycondensation catalyst in a co-presence of a polycondensed resin, so as to obtain a polycondensed resin-containing material; and dispersing the polycondensed resin-containing material in an aqueous medium, so as to obtain a resin particle liquid dispersion in which a median diameter of resin particles is from 0.05 to 2.0 μm.

Claims

1. A process for producing a resin particle liquid dispersion for an electrostatic image developing toner, the process comprising:

polycondensing a polycondensable monomer by utilizing an acid having a surface activating effect as a polycondensation catalyst, so as to obtain a polycondensed resin; and

dispersing the polycondensed resin in an aqueous medium to which a base is added, so as to obtain a resin particle liquid dispersion in which a median diameter of resin particles is from 0.05 to 2.0 μ

m.

2. The process according to claim 1,

wherein the polycondensation catalyst comprises a rare earth-containing catalyst.

3. The process according to claim 1,

wherein the polycondensation catalyst comprises a hydrolase.

4. The process according to claim 1,

wherein an amount of the polycondensation catalyst is from 0.01 to 15 wt % based on a total weight of the polycondensable monomer.

5. The process according to claim 1,

wherein the polycondensed resin particle has an weight average molecular weight of from 1,500 to 60,000.

6. A process for producing an electrostatic image developing toner, the process comprising:

aggregating resin particles in a liquid dispersion containing at least a resin particle liquid dispersion, so as to obtain aggregate particles; and

heating and thereby coalescing the aggregate particles,

wherein the resin particle liquid dispersion is a resin particle liquid dispersion for an electrostatic image developing toner obtained by a process according to claim 1.

7. An electrostatic image developing toner obtained by a process according to claim 6.

8. An electrostatic image developer comprising:

an electrostatic image developing toner according to claim 7;

and

a carrier.

9. An image forming method comprising:

forming an electrostatic latent image on a surface of a latent image holding member;

developing the electrostatic latent image formed on the surface of the latent image holding member with a developer containing a toner, so as to form a toner image;

transferring the toner image formed on the surface of the latent image holding member to a surface of a transferring member; and

heat-fixing the toner image transferred to the surface of the transferring member,

wherein an electrostatic image developing toner according to claim 7 is utilized as the toner or an electrostatic image developer according to claim 8 is utilized as the developer.

10. A process for producing a resin particle liquid dispersion for an electrostatic image developing toner, the process comprising:

polycondensing a polycondensable monomer by utilizing an acid having a surface activating effect as a polycondensation catalyst in a co-presence of a polycondensed resin, so as to obtain a polycondensed resin-containing material; and

dispersing the polycondensed resin-containing material in an aqueous medium, so as to obtain a resin particle liquid dispersion in which a median diameter of resin particles is from 0.05 to 2.0 μ

m.

11. The process according to claim 10,

wherein the polycondensation catalyst comprises a rare earth-containing catalyst.

12. The process according to claim 10,

wherein the polycondensation catalyst comprises a hydrolase.

13. The process according to claim 10,

wherein an amount of the polycondensation catalyst is from 0.01 to 15 wt % based on a total weight of the polycondensable monomer.

14. The process according to claim 10,

wherein the polycondensed resin particle has an weight average molecular weight of from 1,500 to 60,000.

15. A process for producing an electrostatic image developing toner, the process comprising:

aggregating resin particles in a liquid dispersion containing at least a resin particle liquid dispersion, so as to obtain aggregate particles; and

heating and thereby coalescing the aggregate particles,

wherein the resin particle liquid dispersion is a resin particle liquid dispersion for an electrostatic image developing toner obtained by a process according to claim 10.

16. An electrostatic image developing toner obtained by a process according to claim 15.

17. An electrostatic image developer comprising:

an electrostatic image developing toner according to claim 16;

and

a carrier.

18. An image forming method comprising:

forming an electrostatic latent image on a surface of a latent image holding member;

developing the electrostatic latent image formed on the surface of the latent image holding member with a developer containing a toner, so as to form a toner image;

transferring the toner image formed on the surface of the latent image holding member to a surface of a transferring member; and

heat-fixing the toner image transferred to the surface of the transferring member,

wherein an electrostatic image developing toner according to claim 16 is utilized as the toner or an electrostatic image developer according to claim 17 is utilized as the developer.