Toner, developer, toner stored unit, image forming apparatus, image forming method, and printed matter producing method

Patent metadata

Field	Value
Publication number	US-11036156-B2
Application number	US-202016778268-A
Country	US
Kind code	B2
Filing date	Jan 31, 2020
Priority date	Feb 22, 2019
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

A toner is provided which includes: a toner base particle including a binder resin; and an external additive including inorganic particles. A particle size distribution of primary particles of the inorganic particles has a plurality of peaks in the range of from 5 nm through 50 nm. The particle size distribution of the primary particles satisfies all of expressions (1) to (3) below:

n 1 d>n 2 d   (1);

10<( n 1 d+n 2 d )  (2); and

30≤{( n 2 h/n 1 h )×100}<100  (3),
where n1d is a particle diameter (nm) at a peak n1 which is the highest peak among the plurality of peaks and n2d is a particle diameter (nm) of a peak n2 which is the second highest peak among the plurality of peaks, and n1h is a height of the peak n1 and n2h is a height of the peak n2.

First claim

The invention claimed is:

1. A toner, comprising:
a toner base particle including a binder resin; and
an external additive including inorganic particles including primary particles having a particle diameter distribution with a plurality of peaks in a range of from 5 nm through 50 nm,
wherein the particle diameter distribution of the primary particles satisfies all of expressions (1) to (3) below:
n 1 d>n 2 d   (1);

10<( n 1 d+n 2 d )  (2); and

30≤{( n 2 h/n 1 h )×100}<100  (3),

where n1d is a particle diameter (nm) at a peak n1, which is a highest peak among the plurality of peaks,
n2d is a particle diameter (nm) at a peak n2, which is a second highest peak among the plurality of peaks, and
n1h is a height of the peak n1 and n2h is a height of the peak n2.

2. The toner according to claim 1 , wherein the inorganic particles are at least one selected from the group consisting of silica, alumina, and titanic.

3. The toner according to claim 1 , wherein the external additive includes two or more same kinds of inorganic particles having different average particle diameters.

4. A developer comprising:
the toner according to claim 1 .

5. A toner storage container, comprising:
the toner according to claim 1 , which is stored in the toner storage container.

6. 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 containing a developer and configured to develop the electrostatic latent image with the developer to form a visible image;
a transfer device configured to transfer the visible image onto a recording medium; and
a fixing device configured to fix the visible image transferred onto the recording medium,
wherein the developer includes the toner according to claim 1 .

7. An image forming method comprising:
forming an electrostatic latent image on an electrostatic latent image hearer;
developing the electrostatic latent image with a developer to form a visible image;
transferring the visible image onto a recording medium; and
fixing the visible image transferred onto the recording medium,
wherein the developer includes the toner according to claim 1 .

8. A printed matter producing method comprising:
forming a toner image with the toner according to claim 1 on a recording medium.

9. The toner of claim 1 , wherein the particle diameter at peak n1 is more than twice the particle diameter at peak n2.

Assignees

• Ogino Kohtaroh
• Ishii Masayuki
• Kakimoto Masayuki
• Sugimoto Shohichi
• Ricoh Co Ltd

Inventors

• Ogino Kohtaroh
• Ishii Masayuki
• Kakimoto Masayuki
• Sugimoto Shohichi

Classifications

• G03G9/09725

  Silicon-oxides; Silicates · CPC title

• G03G9/09708

  Inorganic compounds · CPC title

• G03G15/0865 Primary

  Arrangements for supplying new developer · CPC title

• G03G9/0819

  characterised by the dimensions of the particles · CPC title

• G03G9/0904

  Carbon black · CPC title