# US 7,745,088 B2 · Non-magnetic toner

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- Number: US 7,745,088 B2
- Document ID: US7745088B2
- Status: Granted
- Kind: B2
- Application number: 12/268,767
- Filed: 2008-11-11
- Published: 2009-07-23
- Granted: 2010-06-29
- Earliest claimed: 2007-07-19
- Assignees: Canon Kabushiki Kaisha
- Inventors: Kazumi Yoshizaki; Koji Inaba; Yasushi Katsuta
- Web page: https://patentgrep.com/patent/US7745088B2

## CPC

- G03G 9/08797: {characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature}
- G03G 9/0806: {whereby chemical synthesis of at least one of the toner components takes place}
- G03G 9/0815: {Post-treatment}
- G03G 9/0819: {characterised by the dimensions of the particles}
- G03G 9/0827: {characterised by their shape, e.g. degree of sphericity}
- G03G 9/08791: {characterised by the presence of specified groups or side chains}
- G03G 9/08795: {characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants}
- G03G 9/09357: {Macromolecular compounds}
- G03G 9/09385: {Inorganic compounds}
- G03G 9/09392: {Preparation thereof}
- G03G 9/09708: {Inorganic compounds}
- G03G 9/09733: {Organic compounds (G03G9/08782 takes precedence)}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

Provided is anon-magnetic toner including toner particles each containing at least a binder resin, a colorant, and a wax component, and an inorganic fine powder, in which: (1) when a temperature in a temperature range of 50 to 80° C. at which a loss tangent (tan δ) shows a maximum is represented by T1, a storage elastic modulus of the toner at the temperature T1 (G′(T1)) satisfies a relationship of 5.00×107≦G′(T1)≦1.00×109 (dN/m2); (2) a continuous temperature range with a width of 15° C. or more in which the loss tangent (tan δ) is 0.80 to 2.00 is present in the temperature range of 50 to 80° C.; and (3) the loss tangent (tan δ) is 1.00 or more in a temperature range of 120 to 160° C.

## Claims

### Claim 1

A non-magnetic toner, comprising:
toner particles each containing at least a binder resin, a colorant, and a wax component; and an inorganic fine powder, wherein the toner particles have a core/shell structure; a polar resin is present in the shell; the shell has a Tg of 80°-120° C. or a peak molecular weight from 8,000 to 250,000; the core has a lower Tg or a lower peak molecular weight than the shell; and
(1) when a temperature in a temperature range of 50 to 80° C. at which a loss tangent (tan) as a ratio of a loss elastic modulus (G″) of the toner to a storage elastic modulus (G′) of the toner shows a maximum is represented by T1, a storage elastic modulus of the toner at the temperature T1 (G′(T1)) (dN/m2) satisfies a relationship of 5.00×107≦G′(T1)≧1.00×109;
(2) a continuous temperature range with a width of 15° C. or more in which the loss tangent (tanδ) as a ratio of the loss elastic modulus (G″) of the toner to the storage elastic modulus (G′) of the toner is 0.80 to 2.00 is present in the temperature range of 50 to 80° C.; and
(3) the loss tangent (tanδ) as a ratio of the loss elastic modulus (G″) of the toner to the storage elastic modulus (G′) of the toner is always 1.00 or more in a temperature range of 120 to 160° C.

### Claim 2 (depends on 1)

A non-magnetic toner according to claim 1, wherein a loss tangent as a ratio of the loss elastic modulus (G″) of the toner to the storage elastic modulus (G′) of the toner at the temperature T1 (tanδ(T1)) satisfies a relationship of 1.00≦tanδ(T1)≦2.00.

### Claim 3 (depends on 1)

A non-magnetic toner according to claim 1, wherein, when a temperature in the temperature range of 120 to 160° C. at which the loss tangent (tanδ) as a ratio of the loss elastic modulus (G″) of the toner to the storage elastic modulus (G′) of the toner shows a maximum is represented by T2, a loss tangent of the toner at the temperature T2 (tanδ(T2)) satisfies a relationship of 1.50≦tanδ(T2)≦4.50, and a storage elastic modulus of the toner at the temperature T2(G′(T2)) (dN/m2) satisfies a relationship of 1.00×103≦G′(T2)≦1.00×105.

### Claim 4 (depends on 1)

A non-magnetic toner according to claim 1, wherein a melt viscosity of the toner at 100° C. measured with a flow tester is 5.00×103 to 2.00×104 Pa·s.

### Claim 5 (depends on 1)

A non-magnetic toner according to claim 1, wherein the toner particles each contain a polymer or copolymer containing a sulfonic group, a sulfonate group, or a sulfonic acid ester group.

### Claim 6 (depends on 1)

A non-magnetic toner according to claim 1, further comprising a compound represented by the following structural formula (1) or (2):
where R1 to R6 each represent an alkyl group having 1 to 6 carbon atoms, and may be identical to or different from one another, and
where R7 to R11 each represent an alkyl group having 1 to 6 carbon atoms, and may be identical to or different from one another.

### Claim 7 (depends on 1)

A non-magnetic toner according to claim 1, wherein the toner has an average circularity measured with a flow-type particle image analyzer of 0.960 to 0.995 and a weight average particle diameter (D4) of 4.0 to 9.0 μm.

### Claim 8 (depends on 1)

A non-magnetic toner according to claim 1, wherein the inorganic fine powder has an average primary particle diameter of 4 to 80 nm, and is added in an amount of 0.1 to 4.0 parts by mass with respect to 100 parts by mass of the toner particles.

### Claim 9 (depends on 1)

A non-magnetic toner according to claim 1, wherein the toner particles are produced through a granulating step in an aqueous medium.

### Claim 10 (depends on 9)

A non-magnetic toner according to claim 9, wherein the toner particles are produced by a suspension polymerization method.