Toner for electrostatic charge image development

Patent metadata

Field	Value
Publication number	US-9696645-B2
Application number	US-201615048160-A
Country	US
Kind code	B2
Filing date	Feb 19, 2016
Priority date	Mar 2, 2015
Publication date	Jul 4, 2017
Grant date	Jul 4, 2017

Abstract

The present invention relates to a toner for electrostatic charge image development containing a binder resin, wherein the binder resin contains a hybrid crystalline polyester resin in which a crystalline polyester resin segment and a segment of an amorphous resin other than a polyester resin are chemically bonded, and an amorphous resin, the hybrid crystalline polyester resin and the amorphous resin having a specific phase-separated structure; and the hybrid crystalline polyester resin is a graft-copolymer having a specific structure, the toner having the specific thermal properties. According to the present invention, a means capable of providing an excellent low temperature fixability even to uneven media, and of improving both of image storability and heat-resistant can be provided.

First claim

What is claimed is:

1. A toner for electrostatic charge image development comprising:
a binder resin, wherein
the binder resin comprises
a hybrid crystalline polyester resin in which a crystalline polyester resin unit and an amorphous resin unit other than a polyester resin are chemically bonded, and
an amorphous resin, and

the binder resin comprises a phase-separated structure in which the hybrid crystalline polyester resin forms a dispersion phase and the amorphous resin forms a continuous phase,
the hybrid crystalline polyester resin is a graft-copolymer having a main chain formed of the amorphous resin unit other than a polyester resin and a side chain formed of the crystalline polyester resin unit, and
the toner satisfies the relationships represented by the following formulas (1) and (2):
0.15<Δ H 2/Δ H 1≦0.95  (1)

55≦ Tm 1≦80  (2)

wherein Tm1 (° C.) is the temperature derived from an endothermic peak of the hybrid crystalline polyester resin in the first heating process in a differential scanning calorimetry of the toner; ΔH1 (J/g) is the amount of endothermic heat based on the endothermic peak; and ΔH2 (J/g) is the amount of endothermic heat based on the endothermic peak in the second heating process.

2. The toner for electrostatic charge image development according to claim 1 , wherein the ΔH1 and the ΔH2 satisfy the relationship represented by the following formula (3):
0.50≦Δ H 2/Δ H 1≦0.90  (3).

3. The toner for electrostatic charge image development according to claim 1 , wherein the ΔH1 and the ΔH2 satisfy the relationship represented by the following formula (4):
0.70≦Δ H 2/Δ H 1≦0.90  (4).

4. The toner for electrostatic charge image development according to claim 1 , wherein the amorphous resin unit other than a polyester resin is contained in a content of 10% by mass or more and less than 30% by mass relative to the total amount of the hybrid crystalline polyester resin.

5. The toner for electrostatic charge image development according to claim 1 , wherein the amorphous resin unit other than a polyester resin is formed of the same resin as the amorphous resin.

6. The toner for electrostatic charge image development according to claim 1 , wherein the hybrid crystalline polyester resin is contained in a content of 5% by mass or more and less than 30% by mass relative to the total amount of the binder resin.

7. The toner for electrostatic charge image development according to claim 1 , wherein the amorphous resin contained in the binder resin is a vinyl resin.

8. The toner for electrostatic charge image development according to claim 1 , wherein the amorphous resin unit other than a polyester resin is a vinyl resin unit.

Assignees

• Konica Minolta Inc

Inventors

• Mine Tomoko
• Matsushima Kaori

Classifications

• G03G9/08786 Primary

  Graft polymers · CPC title

• G03G9/08797

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

• C08F257/02

  on to polymers of styrene or alkyl-substituted styrenes · CPC title