# US 2017/0285501 A1 · Image forming apparatus, electrostatic charge image developing magenta toner, and electrostatic charge image developing toner set

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- Number: US 2017/0285501 A1
- Document ID: US20170285501A1
- Status: Published application
- Kind: A1
- Application number: 15/226,496
- Filed: 2016-08-02
- Published: 2017-10-05
- Earliest claimed: 2016-03-29
- Assignees: Fuji Xerox Co., Ltd.
- Applicants: Fuji Xerox Co., Ltd.
- Inventors: Kana YOSHIDA; Akira MATSUMOTO; Satoshi MIURA
- Web page: https://patentgrep.com/patent/US20170285501A1

## CPC

- G03G 9/0819: {characterised by the dimensions of the particles}
- G03G 9/0821: {characterised by physical parameters (magnetic parameters G03G9/083)}
- G03G 9/091: {Azo dyes}
- G03G 9/0914: {Acridine; Azine; Oxazine; Thiazine-;(Xanthene-) dyes}
- G03G 9/092: {Quinacridones}
- G03G 9/0924: {Dyes characterised by specific substituents}
- G03G 9/0926: {characterised by physical or chemical properties}
- G03G 15/0121: {for developing}
- G03G 15/0822: {Arrangements for preparing, mixing, supplying or dispensing developer}
- G03G 2215/0132: vertical medium transport path at the secondary transfer
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An image forming apparatus includes a first image forming unit that forms a yellow image by an electrostatic charge image developing yellow toner; a second image forming unit that forms a magenta image by an electrostatic charge image developing magenta toner; a transfer unit that transfers the yellow image and the magenta image to a recording medium; and a fixing unit that fixes the yellow image and the magenta image to the recording medium, wherein a maximum absorption wavelength λmax (M) of the electrostatic charge image developing magenta toner at a wavelength of 360 nm to 760 nm is from 530 nm to 580 nm, and when an absorbance of the maximum absorption wavelength λmax (M) is standardized to 1, an absorbance at a wavelength of 450 nm is 0.20 or less and an absorbance at a wavelength of 400 nm is 0.10 or less.

## Claims

### Claim 1

An image forming apparatus comprising:
a first image forming unit that forms a yellow toner image by an electrostatic charge image developing yellow toner;
a second image forming unit that forms a magenta toner image by an electrostatic charge image developing magenta toner;
a transfer unit that transfers the yellow toner image and the magenta toner image to a recording medium; and
a fixing unit that fixes the yellow toner image and the magenta toner image to the recording medium,
wherein a maximum absorption wavelength λmax (M) of the electrostatic charge image developing magenta toner at a wavelength of 360 nm to 760 nm is from 530 nm to 580 nm,
when an absorbance of the maximum absorption wavelength λmax (M) is standardized to 1, an absorbance at a wavelength of 450 nm is 0.20 or less and an absorbance at a wavelength of 400 nm is 0.10 or less,
the magenta toner comprises a magenta colorant and a binder resin,
wherein the D84v/D50v of the magenta colorant is from 1 to 2,
wherein the article diameter at which the cumulative volume distribution reaches 84% of the total particle volume is defined as D84v, and
the particle diameter at which the cumulative volume distribution reaches 50% of the total particle volume is defined as D50v, and
the yellow toner comprises a yellow colorant and a binder resin.

### Claim 2 (depends on 1)

The image forming apparatus according to claim 1, wherein the full width at half maximum of an absorption peak in the maximum absorption wavelength λmax (M) of the electrostatic charge image developing magenta toner is 100 nm or less.

### Claim 3 (depends on 1)

The image forming apparatus according to claim 1, wherein a maximum absorption wavelength λmax (Y) of the electrostatic charge image developing yellow toner at a wavelength of 360 nm to 760 nm is from 400 nm to 440 nm, and
when the absorbance of the maximum absorption wavelength λmax (Y) is standardized to 1, the absorbance at a wavelength of 510 nm is 0.20 or less and the absorbance at a wavelength of 550 nm is 0.10 or less.

### Claim 4 (depends on 1)

The image forming apparatus according to claim 1, wherein the full width at half maximum of an absorption peak in the maximum absorption wavelength λmax (Y) of the electrostatic charge image developing yellow toner is 50 nm or less.

### Claim 5

An electrostatic charge image developing magenta toner,
wherein a maximum absorption wavelength λmax (M) at a wavelength of 360 nm to 760 nm is from 530 nm to 580 nm,
when the absorbance of the maximum absorption wavelength λmax (M) is standardized to 1, the absorbance at a wavelength of 450 nm is 0.20 or less and the absorbance at a wavelength of 400 nm is 0.10 or less, and
the magenta toner comprises a magenta colorant and a binder resin,
wherein the D84v/D50v of the magenta colorant is from 1 to 2,
wherein the particle diameter at which the cumulative volume distribution reaches 84% of the total particle volume is defined D84v, and
the article diameter at which the cumulative volume distribution reaches 50% of the total particle volume is defined as D50v.

### Claim 6 (depends on 5)

The electrostatic charge image developing magenta toner according to claim 5, wherein the full width at half maximum of an absorption peak in the maximum absorption wavelength λmax (M) is 100 nm or less.

### Claim 7 (depends on 5)

An electrostatic charge image developing toner set, comprising:
the electrostatic charge image developing magenta toner according to claim 5; and
an electrostatic charge image developing yellow toner,
wherein a maximum absorption wavelength λmax (Y) of the electrostatic charge image developing yellow toner at a wavelength of 360 nm to 760 nm is from 400 nm to 440 nm, and
when an absorbance of the maximum absorption wavelength λmax (Y) is standardized to 1, an absorbance at a wavelength of 510 nm is 0.20 or less and an absorbance at a wavelength of 550 nm is 0.10 or less.

### Claim 8 (depends on 7)

The electrostatic charge image developing toner set according to claim 7, wherein the full width at half maximum of an absorption peak in the maximum absorption wavelength λmax (Y) of the electrostatic charge image developing yellow toner is 50 nm or less.

### Claim 9 (depends on 1)

The image forming apparatus according to claim 1, wherein the binder resin comprises at least one of a homopolymer of monomers, a (meth)acrylic ester, an ethylenically unsaturated nitrile, a vinyl ether, a vinyl ketone, an olefin, a vinyl resin formed of copolymers obtained by combining two or more different monomers, a non-vinyl resin, a mixture of non-vinyl and the vinyl resins, or a graft polymer obtained by polymerizing a vinyl monomer in the co-presence of a non-vinyl resin.

### Claim 10 (depends on 1)

The image forming apparatus according to claim 1, wherein the magenta colorant comprises at least one of a β-naphthol pigment, an azo lake pigment, a quinacridone pigment, a disazo pigment, a benzimidazolone pigment, a diazo condensation pigment, a dioxazine pigment, or a diketopyrrolopyrrole pigment.

### Claim 11 (depends on 5)

The electrostatic charge image developing magenta toner according to claim 5, wherein the binder resin comprises at least one of a homopolymer of monomers, a (meth)acrylic ester, an ethylenically unsaturated nitrile, a vinyl ether, a vinyl ketone, an olefin, a vinyl resin formed of copolymers obtained by combining two or more different monomers, a non-vinyl resin, a mixture of non-vinyl and the vinyl resins, or a graft polymer obtained by polymerizing a vinyl monomer in the co-presence of a non-vinyl resin.

### Claim 12 (depends on 5)

The electrostatic charge image developing magenta toner according to claim 5, wherein the magenta colorant comprises at least one of a β-naphthol pigment, an azo lake pigment, a quinacridone pigment, a disazo pigment, a benzimidazolone pigment, a diazo condensation pigment, a dioxazine pigment, or a diketopyrrolopyrrole pigment.

### Claim 13 (depends on 1)

The image forming apparatus according to claim 1, wherein the D84v/D50v of the magenta colorant is from 1 to 1.6.

### Claim 14 (depends on 1)

The image forming apparatus according to claim 1, wherein the D84v/D50v of the magenta colorant is from 1 to 1.41.

### Claim 15 (depends on 1)

The image forming apparatus according to claim 1, wherein the D84v/D50v of the magenta colorant is from 1 to 1.3.

### Claim 16 (depends on 5)

The electrostatic charge image developing magenta toner according to claim 5, wherein the D84v/D50v of the magenta colorant is from 1 to 1.6.

### Claim 17 (depends on 5)

The electrostatic charge image developing magenta toner according to claim 5, wherein the D84v/D50v of the magenta colorant is from 1 to 1.41.

### Claim 18 (depends on 5)

The electrostatic charge image developing magenta toner according to claim 5, wherein the D84v/D50v of the magenta colorant is from 1 to 1.3.