Toner

• US 9,261,806 B2
• Filed: 07/28/2014
• Issued: 02/16/2016
• Est. Priority Date: 08/01/2013
• Status: Active Grant

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Moribe, Shuhei, Okamoto, Naoki, Fukudome, Kosuke, Nakamura, Kunihiko, Umeda, Noriyoshi, Shiotari, Yoshiaki, Ida, Tetsuya, Mita, Satoshi
• Primary Examiner(s): Chapman, Mark A
• Application Number:
  US14/444,989
• Publication Number:
  US 20150037728A1
• Time in Patent Office: 568 Days
• Field of Search: 430/109.4
• US Class Current: 1/1
• CPC Class Codes: G03G 9/08755 Polyesters
• CPC Class Codes: G03G 9/08791 characterised by the presence of specified groups or side chains
• 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

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/cm³)^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.

Claims

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/cm³)^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/cm³)^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≦

C1/C2≦

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.