Toner set, image forming apparatus, and image forming method

Patent metadata

Field	Value
Publication number	US-10564571-B2
Application number	US-201816133825-A
Country	US
Kind code	B2
Filing date	Sep 18, 2018
Priority date	Sep 19, 2017
Publication date	Feb 18, 2020
Grant date	Feb 18, 2020

Abstract

A toner set for use in an image forming apparatus is provided. The toner set includes a fluorescent toner and a color toner. The fluorescent toner comprises a binder resin and a fluorescent agent. The color toner comprises a binder resin and a colorant. A 60-degree gloss value (Gf) of a solid image of the fluorescent toner is in a range of from 10 to 25, and a difference (Gn−Gf) between a 60-degree gloss value (Gn) of a solid image of the color toner and the 60-degree gloss value (Gf) of the solid image of the fluorescent toner is in a range of from 10 to 28.

First claim

The invention claimed is:

1. A toner set for use in an image forming apparatus, comprising:
a fluorescent toner comprising a binder resin and a fluorescent agent; and
a color toner comprising a binder resin and a colorant,
wherein a 60-degree gloss value (Gf) of a solid image of the fluorescent toner is in a range of from 10 to 25,
wherein a difference (Gn−Gf) between a 60-degree gloss value (Gn) of a solid image of the color toner and the 60-degree gloss value (Gf) of the solid image of the fluorescent toner is in a range of from 10 to 28,
wherein each of the fluorescent toner and the color toner is in a form of a toner particle,
wherein each of the 60-degree glass value (Gf) of the solid image of the fluorescent toner and the 60-degree glass value (Gn) of the solid image of the color toner is measured by a gloss meter, and
wherein a weight average molecular weight (Mwn) of a binder resin of the color toner is smaller than a weight average molecular weight (Mwf) of a binder resin of the fluorescent toner.

2. The toner set of claim 1 , wherein the 60-degree gloss value (Gf) of the solid image of the fluorescent toner is in a range of from 10 to 20.

3. The toner set of claim 1 ,
wherein a loss tangent (tan δf) of the fluorescent toner at 100° C. to 140° C. is in a range of from 1.0 to 2.0,
wherein a loss tangent (tan δn) of the color toner at 100° C. to 140° C. is in a range of from 1.5 to 3.0,
wherein a ratio (tan δn/tan δf) of the loss tangent (tan δn) of the color toner at 100° C. to 140° C. to the loss tangent (tan δf) of the fluorescent toner at 100° C. to 140° C. is greater than 1 and not greater than 3.

4. The toner set of claim 1 , wherein the color toner comprises cyan toner, magenta toner, yellow toner, and black toner.

5. The toner set of claim 1 , wherein the fluorescent agent comprises C.I. Pigment Yellow 101.

6. The toner set of claim 1 , wherein the 60-degree gloss value (Gn) of the solid image of the color toner is in a range of from 25 to 50.

7. The toner set of claim 1 , wherein the 60-degree gloss value (Gn) of the solid image of the color toner is in a range of from 30 to 45.

8. The toner set of claim 1 , wherein the weight average molecular weight (Mwf) of the binder resin of the fluorescent toner is from 10,000 to 50,000.

9. An image forming apparatus comprising:
an electrostatic latent image bearer;
an electrostatic latent image forming device configured to form an electrostatic latent image on the electrostatic latent image bearer;
a developing device comprising the toner set of claim 1 , configured to develop the electrostatic latent image into a visible image with the toner set;
a transfer device configured to transfer the visible image onto a recording medium; and
a fixing device configured to fix the transferred image on the recording medium.

10. An image forming method comprising:
forming an electrostatic latent image on an electrostatic latent image bearer;
developing the electrostatic latent image into a visible image with the toner set of claim 1 ;
transferring the visible image onto a recording medium; and
fixing the transferred image on the recording medium.

Assignees

• Suzuki Kazumi
• Sawada Toyoshi
• Naito Yu
• Matsushita Natsuko
• Ricoh Co Ltd

Inventors

• Suzuki Kazumi
• Sawada Toyoshi
• Naito Yu
• Matsushita Natsuko

Classifications

• G03G9/0906

  Organic dyes · CPC title

• G03G15/16

  of a toner pattern, e.g. a powder pattern {, e.g. magnetic transfer} · CPC title

• G03G9/087

  Binders for toner particles · CPC title

• G03G9/0904

  Carbon black · CPC title

• G03G15/0865 Primary

  Arrangements for supplying new developer · CPC title