Toner, developer using the toner, image forming apparatus

Patent metadata

Field	Value
Publication number	US-9519235-B2
Application number	US-201514694451-A
Country	US
Kind code	B2
Filing date	Apr 23, 2015
Priority date	Oct 17, 2011
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

A toner including at least a crystalline resin as a binder resin, wherein a tetrahydrofuran soluble content of the toner includes 5.0% or more as a peak area of a component having a molecular weight of 100,000 or greater in a molecular weight distribution measured by gel permeation chromatography, and the tetrahydrofuran soluble content of the toner has a weight-average molecular weight of 20,000 to 60,000.

First claim

The invention claimed is:

1. A toner, comprising:
a binder resin comprising a crystalline resin, wherein the crystalline resin comprises a crystalline polyester resin and a urethane bond, a urea bond, or any combination thereof,
wherein a tetrahydrofuran soluble content of the toner comprises 5.0% or more as a peak area of a component having a molecular weight of 100,000 or greater in a molecular weight distribution measured by gel permeation chromatography, and
wherein the tetrahydrofuran soluble content of the toner has a weight-average molecular weight of 20,000 to 60,000.

2. The toner of claim 1 , wherein a ratio of (C) integrated intensity of a spectrum derived from a crystalline structure to a sum of the (C) and (A) integrated intensity of a spectrum derived from a non-crystalline structure [C/(A+C)] is 0.13 or greater in a diffraction spectrum of the toner obtained by an x-ray diffraction apparatus.

3. The toner of claim 1 , wherein the tetrahydrofuran soluble content of the toner comprises at least 0.5% or more as a peak area of a component having a molecular weight of 250,000 or greater in the molecular weight distribution measured by gel permeation chromatography.

4. The toner of claim 1 , wherein a ratio [ΔH(H)/ΔH(T)] of an endothermic quantity [ΔH(T), (J/g)] in a differential scanning calorimetry of the toner and an endothermic quantity [ΔH(H), (J/g)] in a differential scanning calorimetry of an insoluble content of the toner with respect to a mixed solvent of tetrahydrofuran and ethyl acetate [tetrahydrofuran/ethyl acetate=50/50 (mass ratio)] is in the range of 0.20 to 1.25.

5. The toner of claim 1 , wherein the crystalline resin comprises a component wherein a modified crystalline resin having an isocyanate group at an end thereof is elongated.

6. The toner of claim 1 , wherein the crystalline resin comprises a first crystalline resin and a second crystalline resin having a weight-average molecular weight greater than that of the first crystalline resin.

7. The toner of claim 1 , wherein a content of N element in a CHN analysis of the tetrahydrofuran soluble content of the toner is in the range of 0.3% by mass to 2.0% by mass.

8. The toner of claim 1 , wherein an insoluble content of the toner with respect to a mixed solution of tetrahydrofuran and ethyl acetate (tetrahydrofuran/ethyl acetate=50/50 (mass ratio)) is 10.0% by mass or greater.

9. The toner of claim 1 , wherein a common logarithmic value of a volume resistivity R of the toner by an AC bridge method is in the range of 10.0 to 10.6.

10. A developer, comprising:
a toner comprising a binder resin comprising a crystalline resin, wherein the crystalline resin comprises a crystalline polyester resin and a urethane bond, a urea bond, or any combination thereof,
wherein a tetrahydrofuran soluble content of the toner comprises 5.0% or more as a peak area of a component having a molecular weight of 100,000 or greater in a molecular weight distribution measured by gel permeation chromatography, and
wherein the tetrahydrofuran soluble content of the toner has a weight-average molecular weight of 20,000 to 60,000.

Assignees

• Ricoh Co Ltd

Inventors

• Sakashita Shingo
• Nakayama Shinya
• Yamada Masahide
• Yamamoto Atsushi
• Santo Hideyuki
• Nakajima Yukiko
• Amemori Suzuka

Classifications

• G03G9/08793

  Crosslinked polymers · CPC title

• C08G63/00

  Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule (polyester-amides C08G69/44; polyester-imides C08G73/16) · CPC title

• G03G9/08755

  Polyesters · CPC title

• G03G9/08797

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

• G03G9/08764 Primary

  Polyureas; Polyurethanes · CPC title