Toner

Patent metadata

Field	Value
Publication number	US-9599919-B2
Application number	US-201414555525-A
Country	US
Kind code	B2
Filing date	Nov 26, 2014
Priority date	Nov 29, 2013
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

The present invention relates to a toner having a toner particle containing a binder resin containing a styrene acrylic resin and a block polymer, wherein the block polymer has a polyester segment and a vinyl polymer segment and has a melting point of 55° C. to 90° C., the polyester segment has a specific structure and a solubility parameter (SP) value of 9.40 to 9.85, and the vinyl polymer segment has a weight-average molecular weight (Mw) of 4000 to 15000.

First claim

What is claimed is:

1. A toner having a toner particle comprising a binder resin, said binder resin comprising a styrene acrylic resin and a linear block polymer, wherein
the block polymer has a polyester segment and a vinyl polymer segment,
the melting point (Tm) of the block polymer is 55° C. to 90° C.,
the polyester segment has at least two structures selected from structures represented by the following formulas (1) to (3), or a structure represented by the following formula (3),
the solubility parameter (SP) value of the polyester segment is 9.40 to 9.85, and
the weight-average molecular weight (Mw) of the vinyl polymer segment is 4000 to 15000:

(m represents an integer of 6 to 14),

(n represents an integer of 6 to 16), and

(p represents an integer of 5 to 15).

2. The toner according to claim 1 , wherein the polyester segment has a structure represented by the formula (1) and a structure represented by the formula (2).

3. The toner according to claim 1 , wherein the content of the block polymer in the binder resin is 2.0% by mass to 50.0% by mass.

4. The toner according to claim 3 , wherein the content of the block polymer in the binder resin is 6.0% by mass to 50.0% by mass.

5. The toner according to claim 1 , wherein the ratio (C/A ratio) of the polyester segment to the vinyl polymer segment is 40:60 to 80:20.

6. The toner according to claim 5 , wherein the ratio (C/A ratio) of the polyester segment to the vinyl polymer segment is 40:60 to 70:30.

7. The toner according to claim 1 , wherein the weight-average molecular weight (Mw) of the block polymer is 15000 to 45000.

8. The toner according to claim 7 , wherein the weight-average molecular weight (Mw) of the block polymer is 20000 to 45000.

9. The toner according to claim 1 , wherein the ratio (Mw/Mn) of the weight-average molecular weight (Mw) to the number average molecular weight (Mn) of the block polymer is 1.5 to 3.5.

10. The toner according to claim 1 , wherein the ratio (Mw/Mn) of the weight-average molecular weight (Mw) to the number average molecular weight (Mn) of the vinyl polymer segment is 1.3 to 3.5.

11. The toner according to claim 1 , wherein the SP value of the styrene acrylic resin is 9.45 to 9.90.

12. The toner according to claim 1 , wherein the absolute value (ΔSP value) of a difference between the solubility parameter (SP) value of the styrene acrylic resin and the SP value of the block polymer is 0.03 to 0.20.

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

14. A toner having a toner particle comprising a binder resin, said binder resin comprising a styrene acrylic resin and a block polymer, wherein
the block polymer has a polyester segment and a vinyl polymer segment,
the melting point (Tm) of the block polymer is 55° C to 90° C.
the polyester segment has at least two structures selected from structures represented by the following formulas ( 1 ) to ( 3 ), or a structure represented by the following formula ( 3 ),
the solubility parameter (SP) value of the polyester segment is 9.40 to 9.85, and
the weight-average molecular weight (Mw) of the vinyl polymer segment is 4000 to 15000;

(m represents an integer of 6 to 14),

(n represents an integer of 6 to 16), and

(p represents an integer of 5 to 15).

Assignees

• Canon Kk

Inventors

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

Classifications

• G03G9/0804

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

• G03G9/08797

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

• G03G9/08711 Primary

  with esters of acrylic or methacrylic acid · CPC title

• G03G9/08795

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

• G03G9/08788

  Block polymers · CPC title