TONER

• US 20190339629A1
• Filed: 04/08/2019
• Published: 11/07/2019
• Est. Priority Date: 05/01/2018
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Yamashita, Daisuke, Mizo, Yuichi, Ishigami, Koh, Miura, Masaharu, Shibata, Takaho, Ohtsu, Takeshi, Iwasaki, Yosuke, Katsumata, Wakiko, Sano, Hitoshi, Mitsuiki, Kenta, Kobori, Takakuni, Hijikawa, Rei
• Granted Patent: US 10,642,178 B2
• Time in Patent Office: Days
• CPC Class Codes: C08G 63/16 Dicarboxylic acids and dihydroxy compounds
• CPC Class Codes: C08G 63/183 Terephthalic acids
• CPC Class Codes: C08G 63/672 Dicarboxylic acids and dihydroxy compounds
• CPC Class Codes: C08L 67/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C08L67/06 takes precedence
• CPC Class Codes: G03G 9/08755 Polyesters
• 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

A toner comprising a toner particle including a binder resin and a crystalline polyester resin, wherein the binder resin is an amorphous polyester resin having a linear alkyl group at a molecular chain terminal; the crystalline polyester resin is a polycondensate of a diol and a dicarboxylic acid; the number of carbon atoms C_aPES of the linear alkyl group, the number of carbon atoms C_OH of the diol, and the number of carbon atoms C_Ac of the dicarboxylic acid, excluding carbon that belongs to carboxyl groups, satisfy the following relationships; and a glass transition temperature of the toner as measured by a differential scanning calorimeter is from 40.0° C. to 55.0° C.

8≤C_aPES≤20  (1)

C_Ac/C_OH≥3.5 and 0≤|C_Ac−C_aPES|≤3  (2)

C_OH/C_Ac≥3.5 and 0≤|C_OH−C_aPES|≤3  (3)

Claims

1. A toner comprising a toner particle including a binder resin and a crystalline polyester resin, wherein

the binder resin is an amorphous polyester resin having a linear alkyl group at a molecular chain terminal,

the crystalline polyester resin is a polycondensate of a diol and a dicarboxylic acid,

where the number of carbon atoms of the linear alkyl group is denoted by C_aPES, the number of carbon atoms of the diol is denoted by C_OH, and the number of carbon atoms of the dicarboxylic acid, excluding carbon that belongs to carboxyl groups, is denoted by C_Ac,

the C_aPES, the C_OH, and the C_Ac satisfy the following relationships (1), and (2) or (3), and

a glass transition temperature of the toner as measured by a differential scanning calorimeter is from 40.0°

C. to 55.0°

C.

8≤

C_aPES≤

20 

 

(1)

C_Ac/C_OH≥

3.5 and 0≤

|C_Ac−

C_aPES|≤

3 

 

(2)

C_OH/C_Ac≥

3.5 and 0≤

|C_OH−

C_aPES|≤

3. 

 

(3)

2. The toner according to claim 1, wherein the molecular chain terminal is a group formed by detachment of a hydrogen atom of a hydroxyl group of a linear alkyl monoalcohol or a group formed by detachment of a hydrogen atom of a carboxyl group of a linear alkyl monocarboxylic acid, and

the linear alkyl group is an alkyl group included in the group formed by detachment of a hydrogen atom of a hydroxyl group of a linear alkyl monoalcohol or the group formed by detachment of a hydrogen atom of a carboxyl group of a linear alkyl monocarboxylic acid.

3. The toner according to claim 1, wherein

where a solubility parameter of the amorphous polyester resin is denoted by SP_aPES (cal/cm³)^1/2, and a solubility parameter of the crystalline polyester resin is denoted by SP_cPES (cal/cm³)^1/2,

the SP_aPES and the SP_cPES satisfy the following relationship (4), and

a melting point of the crystalline polyester resin is from 75°

C. to 100°

C.

1.00 (cal/cm³)^1/2≤

(SP_aPES−

SP_cPES)≤

1.50 (cal/cm³)^1/2. 

 

(4)

4. The toner according to claim 1, wherein the C_aPES, the C_OH, and the C_Ac satisfy the following relationships (1), and (2)′

or (3)′

8≤

C_aPES≤

20 

 

(1)

C_Ac/C_OH≥

3.5 and C_Ac=C_aPES 

 

(2)′

C_OH/C_Ac≥

3.5 and C_OH=C_aPES. 

 

(3)′