Toner

Patent metadata

Field	Value
Publication number	US-9261806-B2
Application number	US-201414444989-A
Country	US
Kind code	B2
Filing date	Jul 28, 2014
Priority date	Aug 1, 2013
Publication date	Feb 16, 2016
Grant date	Feb 16, 2016

Abstract

Provided is a toner having excellent long-term storage stability and exhibiting both low-temperature fixability and uniform gloss in high-speed printing. A toner has a toner particle that contains a crystalline polyester resin A, an amorphous polyester resin B and a colorant, wherein the crystalline polyester resin A has a polyester molecular chain having a nucleating agent segment at the terminal end thereof, and an SP value Sa ((cal/cm 3 ) 1/2 ) of the crystalline polyester resin A ranges from 9.00 to 11.50, and the amorphous polyester resin B has a specific functional group.

First claim

What is claimed is:

1. A toner comprising a toner particle that contains a crystalline polyester resin A, an amorphous polyester resin B and a colorant,
(1) wherein the crystalline polyester resin A has a polyester molecular chain having a nucleating agent segment at the terminal end thereof, and has an SP value (Sa) ((cal/cm 3 ) 1/2 ) ranging from 9.00 to 11.50, and
(2) the amorphous polyester resin B has at least one functional group selected from the group consisting of (a) to (c):
(a) an aliphatic hydrocarbon group having 8 to 50 carbon atoms;
(b) a functional group of which an aliphatic alcohol having 8 to 50 carbon atoms has been bound by condensation; and
(c) a functional group of which an aliphatic carboxylic acid having 9 to 51 carbon atoms has been bound by condensation.

2. The toner according to claim 1 ,
wherein the Sa and an SP value (Sb) ((cal/cm 3 ) 1/2 ) of the amorphous polyester resin B satisfy Expression (1):
−1.50 ≦Sb−Sa≦ 1.50  Expression (1).

3. The toner according to claim 1 ,
wherein the nucleating agent segment is a segment derived from an aliphatic monoalcohol having 10 to 30 carbon atoms and/or an aliphatic monocarboxylic acid having 11 to 31 carbon atoms.

4. The toner according to claim 1 , wherein a mass ratio of the crystalline polyester resin A and the amorphous polyester resin B (crystalline polyester resin A:amorphous polyester resin B) ranges from 5:95 to 40:60.

5. The toner according to claim 1 , wherein the number of carbon atoms (C1) of the nucleating agent segment of the crystalline polyester resin A and the number of carbon atoms (C2) of the functional group of the amorphous polyester resin B satisfy Expression (2):
0.5 ≦C 1 /C 2≦3.0  Expression (2).

6. The toner according to claim 1 , wherein the content of a component that constitutes the functional group of the amorphous polyester resin B ranges from 2.0 mol % to 11.0 mol % of monomers that constitute the amorphous polyester resin B.

Assignees

• Canon Kk

Inventors

• Moribe Shuhei
• Okamoto Naoki
• Fukudome Kosuke
• Mita Satoshi
• Nakamura Kunihiko
• Umeda Noriyoshi
• Shiotari Yoshiaki
• Ida Tetsuya

Classifications

• G03G9/08795

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

• G03G9/08797

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

• G03G9/08755 Primary

  Polyesters · CPC title

• G03G9/08791

  characterised by the presence of specified groups or side chains · CPC title