Toner

Patent metadata

Field	Value
Publication number	US-11934147-B2
Application number	US-202117195716-A
Country	US
Kind code	B2
Filing date	Mar 9, 2021
Priority date	Mar 16, 2020
Publication date	Mar 19, 2024
Grant date	Mar 19, 2024

Abstract

A toner comprising a toner particle comprising a binder resin and organosilicon polymer particles on a surface of the toner particle, wherein the binder resin comprising an amorphous resin and a crystalline polyester resin, an absolute value |SPcpes−SPsi| of a difference between an SP value (SPsi) of the organosilicon polymer particles and an SP value (SPcpes) of the crystalline polyester resin is not more than 2.00 (cal/cm3)1/2, and an amount of adsorbed water in the organosilicon polymer particles at a temperature of 30° C. and a humidity of 80% RH is not more than 20 mg/g.

First claim

What is claimed is:

1. A toner, comprising:
a toner particle comprising a binder resin and organosilicon polymer particles on a surface of the toner particle;
the binder resin comprising an amorphous resin and a crystalline polyester resin, wherein
a concentration of methanol is 45 to 80 vol % when a transmittance of light with a wavelength of 780 nm is 50% in a wettability test of the organosilicon polymer particles using a mixed solvent of methanol/water,
|SP cpes −SP si | is not more than 2.00 (cal/cm 3 ) 1/2 where SP si is an SP value of the organosilicon polymer particles and SP cpes is an SP value of the crystalline polyester resin, and
an amount of adsorbed water in the organosilicon polymer particles at a temperature of 30° C. and a humidity of 80% RH is not more than 20 mg/g.

2. The toner according to claim 1 , wherein a coverage ratio of the organosilicon polymer particles on the surfaces of the toner particle is at least 15 area %.

3. The toner according to claim 1 , wherein a content of the organosilicon polymer particles is 0.3 to 10.0 parts by mass with respect to 100 parts by mass of the toner particle.

4. The toner according to claim 1 , wherein a number-average particle diameter of primary particles of the organosilicon polymer particles is 10 to 500 nm.

5. The toner according to claim 1 , wherein the organosilicon polymer particles have a T3 unit structure represented by Formula (1)
R 1 —SiO 3/2   (1)

where R 1 represents an alkyl group having 1 to 6 carbon atoms or phenyl group, and
a ratio of an area of a peak originating with silicon having the T3 unit structure to a total area of peaks originating with all silicon elements contained in the organosilicon polymer particles is 0.50 to 1.00 in 29 Si-NMR measurement of the organosilicon polymer particles.

6. The toner according to claim 1 , wherein a ratio of oxygen atoms derived from silanol groups among oxygen atoms in the organosilicon polymer particles is not more than 40.0 mol %.

7. The toner according to claim 1 , wherein a content of the crystalline polyester resin in the binder resin is 4.0 to 50.0 mass %.

8. The toner according to claim 1 , wherein SP cpes is 9.25 to 10.80.

9. The toner according to claim 1 , wherein the crystalline polyester resin comprises at least one of (a) a structure in which at least one monomer selected from the group consisting of α,ω-linear aliphatic diols having from 2 to 3 carbon atoms is polycondensed, and (b) a structure in which at least one monomer selected from the group consisting of α,ω-linear aliphatic dicarboxylic acids having from 2 to 3 carbon atoms is polycondensed.

10. The toner according to claim 1 , wherein an attachment index of the organosilicon polymer particles with respect to a polycarbonate film is not more than 4.5, where attachment index=area ratio A of the organosilicon polymer particles transferred to the polycarbonate film/coverage ratio B of the organosilicon polymer particles on the surface of the toner particle×100.

11. The toner according to claim 1 , wherein a dispersity evaluation index of the organosilicon polymer particles on the toner surface is 0.5 to 2.0.

12. The toner according to claim 6 , wherein the ratio of oxygen atoms derived from silanol groups among oxygen atoms in the organosilicon polymer particles is 2.0 to 40.0 mol %.

13. The toner according to claim 1 , wherein the amount of adsorbed water in the organosilicon polymer particles at a temperature of 30° C. and a humidity of 80% RH is 10 to 20 mg/g.

14. The toner according to claim 1 , wherein (Dsi/Dt) is 0.0125 to 0.0250 when Dsi is the number-average particle diameter of primary particles of the organosilicon polymer particles, and Dt is the number-average particle diameter of the toner particle.

15. The toner according to claim 1 , wherein SP cpes is 9.79 to 10.55.

Assignees

• Canon Kk

Inventors

• Hashimoto Yasuhiro
• Nishikawa Koji
• Nagashima Yuujirou
• Nagaoka Tomoya

Classifications

• G03G9/09775 Primary

  containing atoms other than carbon, hydrogen or oxygen (G03G9/09741 - G03G9/09766 take precedence) · CPC title

• G03G9/0819

  characterised by the dimensions of the particles · CPC title

• G03G9/08711

  with esters of acrylic or methacrylic acid · CPC title

• G03G9/08755

  Polyesters · CPC title

• G03G9/08757

  Polycarbonates · CPC title