Toner

Patent metadata

Field	Value
Publication number	US-9377705-B2
Application number	US-201414555536-A
Country	US
Kind code	B2
Filing date	Nov 26, 2014
Priority date	Nov 29, 2013
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

A toner containing a toner particle containing a binder resin, wherein the binder resin contains a styrene-acrylic resin and a crystalline resin, and the crystalline resin is a block polymer or a graft polymer in which the mass ratio between the crystalline segment and an amorphous segment is 30:70 to 90:10, and wherein, in the total heat flow measured for the binder resin by a temperature-modulated differential scanning calorimeter, the peak temperature of an endothermic peak is from 55.0° C. to 90.0° C., and the percentage of the endothermic quantity of the endothermic peak in the reversing heat flow with respect to the endothermic quantity of the endothermic peak in the total heat flow is from 0.0% to 35.0%.

First claim

What is claimed is:

1. A toner comprising:
a toner particle that contains a binder resin,
wherein;
the binder resin contains a styrene-acrylic resin and a crystalline resin,
the crystalline resin is a block polymer or a graft polymer which has a crystalline segment and an amorphous segment,
the mass ratio between the crystalline segment and the amorphous segment is from 30:70 to 90:10,
and wherein;
in a total heat flow of the binder resin obtained by measuring the binder resin with a temperature-modulated differential scanning calorimeter,
a peak temperature of an endothermic peak is from at least 55.0° C. to not more than 90.0° C., and
the percentage of an endothermic quantity of the endothermic peak in a reversing heat flow with respect to an endothermic quantity of the endothermic peak in the total heat flow is from at least 0.0% to not more than 35.0%.

2. The toner according to claim 1 , wherein the crystalline resin is a block polymer in which the crystalline segment is a polyester and the amorphous segment is a vinyl polymer.

3. The toner according to claim 1 , wherein the mass ratio between the crystalline segment and the amorphous segment in the crystalline resin is from 40:60 to 80:20.

4. The toner according to claim 3 , wherein the mass ratio between the crystalline segment and the amorphous segment in the crystalline resin is from 40:60 to 70:30.

5. The toner according to claim 1 , wherein the crystalline segment of the crystalline resin has a structure represented by the following formula (1) and a structure represented by the following formula (2):

(in formula (1), m represents an integer from at least 6 to not more than 14)

(in formula (2), n represents an integer from at least 6 to not more than 16).

6. The toner according to claim 1 , wherein the absolute value (ΔSP value) of the difference between the solubility parameter (SP) values for the styrene-acrylic resin and the crystalline segment of the crystalline resin is from at least 0.00 to not more than 0.35.

7. The toner according to claim 1 , wherein the absolute value (ΔSP value) of the difference between the solubility parameter (SP) values for the styrene-acrylic resin and the amorphous segment of the crystalline resin is from at least 0.00 to not more than 0.35.

8. The toner according to claim 1 , wherein the content of the crystalline resin in the binder resin is from at least 2.0 mass % to not more than 50.0 mass %.

9. The toner according to claim 8 , wherein the content of the crystalline resin in the binder resin is from at least 6.0 mass % to not more than 50.0 mass %.

10. The toner according to claim 1 , wherein the toner particle is a toner particle produced by a suspension polymerization method.

11. The toner according to claim 1 , wherein the weight-average molecular weight (Mw) of the crystalline resin is from at least 15,000 to not more than 45,000.

12. The toner according to claim 11 , wherein the weight-average molecular weight (Mw) of the crystalline resin is from at least 20,000 to not more than 45,000.

Assignees

• Canon Kk

Inventors

• Shimano Tsutomu
• Tanaka Masatake
• Isono Naoya
• NOJI Shintaro
• Yoshida Yu

Classifications

• G03G9/08755

  Polyesters · CPC title

• G03G9/087 Primary

  Binders for toner particles · CPC title

• G03G9/08797

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

• G03G9/08788

  Block polymers · CPC title

• G03G9/08795

  characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants · CPC title