Electrostatic latent image developing toner

Patent metadata

Field	Value
Publication number	US-9996017-B2
Application number	US-201715623600-A
Country	US
Kind code	B2
Filing date	Jun 15, 2017
Priority date	Jun 23, 2016
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

Abstract

An object of the present invention is to provide an electrostatic latent image developing toner containing: a binder resin; and a releasing agent, wherein the binder resin contains a crystalline polyester resin; an endothermic peak top temperature of the electrostatic latent image developing toner is 70° C. or more measured with differential scanning calorimetry (DSC) in a heating-up period of the toner; and a heat value ΔH c (L) is 15% or less with respect to a heat value ΔH c , wherein the heat value ΔH c (L) is a heat value in the range of (an exothermic peak top temperature r c −7° C.) or less; and the heat value ΔH c is a heat value of the total exothermic peak measured with DSC in a heating-down period of the toner.

First claim

What is claimed is:

1. An electrostatic latent image developing toner comprising: a binder resin; and a releasing agent,
wherein the binder resin contains a crystalline polyester resin;
an endothermic peak top temperature of the electrostatic latent image developing toner is 70° C. or more measured with differential scanning calorimetry (DSC) in a heating-up period of the toner; and
a heat value ΔH c (L) is 15% or less with respect to a heat value ΔH c ,
wherein the heat value ΔH c (L) is a heat value in the range of (an exothermic peak top temperature r c −7° C.) or less; and
the heat value ΔH c is a heat value of the total exothermic peak measured with DSC in a heating-down period of the toner.

2. The electrostatic latent image developing toner described in claim 1 ,
wherein the releasing agent contains an aliphatic acid ester wax having 30 to 72 carbon atoms.

3. The electrostatic latent image developing toner described in claim 1 ,
wherein the releasing agent contains a hydrocarbon wax.

4. The electrostatic latent image developing toner described in claim 1 ,
wherein the releasing agent contains a hydrocarbon wax and an aliphatic acid ester wax having 30 to 72 carbon atoms.

5. The electrostatic latent image developing toner described in claim 3 ,
wherein the hydrocarbon wax contains a branched structure.

6. The electrostatic latent image developing toner described in claim 1 ,
wherein the exothermic peak top temperature r c is in the range of 50 to 80° C., the exothermic peak top temperature being measured with DSC in a heating-down period of the toner.

7. The electrostatic latent image developing toner described in claim 1 ,
wherein the exothermic top temperature r c is in the range of 60 to 75° C., the exothermic peak top temperature being measured with DSC in a heating-down period of the toner.

8. The electrostatic latent image developing toner described in claim 1 ,
wherein the crystalline polyester resin contained in the binder resin is a hybrid crystalline polyester resin.

Assignees

• Konica Minolta Inc

Inventors

• Shirai Aya
• Sugama Kouji
• Hirano Shiro
• Ueda Noboru

Classifications

• G03G9/0827

  characterised by their shape, e.g. degree of sphericity · CPC title

• G03G9/0821

  characterised by physical parameters (magnetic parameters G03G9/083) · CPC title

• G03G9/08755

  Polyesters · CPC title

• G03G9/08782 Primary

  Waxes · CPC title

• G03G9/08711

  with esters of acrylic or methacrylic acid · CPC title