# US 2016/0259258 A1 · Toner for electrostatic charge image development

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- Number: US 2016/0259258 A1
- Document ID: US20160259258A1
- Status: Published application
- Kind: A1
- Application number: 15/048,160
- Filed: 2016-02-19
- Published: 2016-09-08
- Earliest claimed: 2015-03-02
- Assignees: Konica Minolta, Inc.
- Applicants: Konica Minolta, Inc.
- Inventors: Tomoko MINE; Kaori MATSUSHIMA
- Web page: https://patentgrep.com/patent/US20160259258A1

## CPC

- G03G 9/08786: {Graft polymers}
- C08F 257/02: on to polymers of styrene or alkyl-substituted styrenes
- G03G 9/08797: {characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## 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.

## Claims

### Claim 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 comprises a phase-separated structure in which the hybrid crystalline polyester resin forming a dispersion phase and the amorphous resin forming a continuous phase; and
the hybrid crystalline polyester resin is a graft-copolymer having a main chain formed of the amorphous resin unit an other than a polyester resin and a side chain formed of the crystalline polyester resin unit,
the toner satisfying the relationships represented by the following formulas (1) and (2):
[Math. 1]
0.15<ΔH2/ΔH1≦0.95 (1)
55≦Tm1≦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.

### Claim 2 (depends on 1)

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):
[Math. 2]
0.50≦ΔH2/ΔH1≦0.90 (3)

### Claim 3 (depends on 1)

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):
[Math. 3]
0.70≦ΔH2/ΔH1≦0.90 (4)

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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.

### Claim 7 (depends on 1)

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

### Claim 8 (depends on 1)

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.