# US 11,971,684 B2 · Toner

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- Number: US 11,971,684 B2
- Document ID: US11971684B2
- Status: Granted
- Kind: B2
- Application number: 17/287,592
- Filed: 2019-10-21
- Published: 2021-10-07
- Granted: 2024-04-30
- Earliest claimed: 2018-10-31
- Assignees: Zeon Corporation
- Applicants: Zeon Corporation
- Inventors: Kojiro Akazaki
- Web page: https://patentgrep.com/patent/US11971684B2

## CPC

- G03G 9/08706: {Polymers of alkenyl-aromatic compounds}
- G03G 9/08728: {Polymers of esters}
- G03G 9/08795: {characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants}
- G03G 9/08797: {characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature}
- G03G 9/09: Colouring agents for toner particles
- G03G 9/09741: {cationic}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

Provided is toner which has good low-temperature fixability, shelf stability and hot offset resistance, and which suppresses a decrease in glossiness of an image. The toner comprising colored resin particles containing a binder resin, a colorant, a softening agent and a charge control agent, and an external additive, wherein a glass transition temperature (Tg) specified from a temperature dependence curve of a loss tangent (tan δ) obtained by dynamic viscoelastic measurement of the toner, is 50° C. or more and less than 90° C.; the loss tangent (tan δ) at the glass transition temperature (Tg) is 1.70 or less; in a temperature range of 90° C. or more and 160° C. or less, a lowest temperature (Ta) with a loss tangent of 1.50 is more than 95° C. and less than 145° C.; and a storage elastic modulus (G′) at the lowest temperature (Ta) is less than 56000 Pa.

## Claims

### Claim 1

A toner comprising
colored resin particles containing a binder resin, a colorant, a softening agent and a charge control agent, and
an external additive,
wherein the binder resin contains a polymer of polymerizable monomers containing at least a monovinyl monomer,
a weight average molecular weight of the polymer is 30000 or more and 80000 or less,
wherein the softening agent is an ester wax, and a content of the softening agent is 12 parts by mass or more and 15 parts by mass or less, with respect to 100 parts by mass of the monovinyl monomer,
wherein a content of the charge control agent is 1.7 parts by mass or more and 15 parts by mass or less, with respect to 100 parts by mass of the monovinyl monomer, and
wherein a glass transition temperature (Tg) specified from a temperature dependence curve of a loss tangent (tan δ) obtained by dynamic viscoelastic measurement of the toner, is 50° C. or more and less than 90° C.; the loss tangent (tan δ) at the glass transition temperature (Tg) is 1.70 or less; in a temperature range of 90° C. or more and 160° C. or less, a lowest temperature (Ta) with a loss tangent of 1.50 is more than 95° C. and less than 145° C.; and a storage elastic modulus (G′) at the lowest temperature (Ta) is 38000 Pa or less.

### Claim 2 (depends on 1)

The toner according to claim 1, wherein a softening temperature (T1/2) measured by a ½ method at a pressure of 5.0 kgf/cm2 using a flow tester, is more than 110° C. and less than 150° C.

### Claim 3 (depends on 1)

The toner according to claim 1, wherein the charge control agent contains a functional group-containing copolymer, and an amount of a functional group-containing constitutional unit contained in the functional group-containing copolymer, is 3% by mass or less.

### Claim 4 (depends on 1)

The toner according to claim 1, wherein the binder resin is a polymer of one or two or more kinds of polymerizable monomers containing at least one kind of monovinyl monomer selected from the group consisting of styrene, acrylic ester and methacrylic ester.