Toner

Patent metadata

Field	Value
Publication number	US-9857707-B2
Application number	US-201514923194-A
Country	US
Kind code	B2
Filing date	Oct 26, 2015
Priority date	Nov 14, 2014
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

Provided is a toner, including: a toner particle containing a binder resin and a colorant; and an inorganic fine particle, in which the toner particle has an average circularity of 0.960 or more, and in which the toner satisfies the formula (1) and the formula (2).

Fp ( A )≦25.0 nN  Formula (1)

( Fp ( B )− Fp ( A ))/ Fp ( A )≦0.60  Formula (2)

First claim

What is claimed is:

1. A toner, comprising:
a toner particle containing a binder resin and a colorant; and
an inorganic fine particle comprising a silica fine particle A, the silica fine particle A having (i) a number average particle diameter (D1) of a primary particle of 80 to 200 nm and (ii) a half width of a maximum peak in a weight-based particle size distribution of 15.0 nm or less, wherein
the toner particle has an average circularity of 0.960 or more, and
the toner satisfies formula (1) and formula (2):
Fp ( A )≦25.0 nN  (1)

( Fp ( B )− Fp ( A ))/ Fp ( A )≦0.60  (2)

in which Fp(A) represents an inter-particle force (nN) of the toner, which is measured by using a consolidated body of the toner prepared by compressing the toner with a load of 78.5 N; and
Fp(B) represents an inter-particle force (nN) of the toner, which is measured by using a consolidated body of the toner prepared by compressing the toner with a load of 157.0 N.

2. A toner according to claim 1 , wherein the silica fine particle A has a saturated moisture adsorption amount of 0.4 to 3.0 mass % after being left to stand under an environment having a temperature of 32.5° C. and a relative humidity of 80% for 2 hours.

3. A toner according to claim 1 , wherein the inorganic fine particle further contains a silica fine particle B having a number average particle diameter (D1) of a primary particle of 5 nm to 20 nm.

4. A toner according to claim 1 , wherein the colorant comprises a magnetic fine particle.

5. A toner according to claim 1 , wherein the toner particle has an average circularity of 0.970 or more.

6. A toner according to claim 5 , wherein the inorganic fine particle further contains a silica fine particle B having a number average particle diameter (D1) of a primary particle of 5 nm to 20 nm.

7. A toner according to claim 6 , wherein the toner particle has an aspect ratio of 0.900 or more.

8. A toner according to claim 7 , wherein the Fp(A) is 19.8 nN or less.

9. A toner according to claim 5 , wherein the toner particle has an aspect ratio of 0.900 or more.

10. A toner according to claim 1 , wherein the toner particle has an aspect ratio of 0.900 or more.

11. A toner according to claim 1 , wherein the Fp(A) is 19.8 nN or less.

Assignees

• Canon Kk

Inventors

• Tsuda Shohei
• Matsui Takashi
• Arimura Satoshi
• Uratani Kozue
• Tanaka Keisuke
• Okamoto Naoki

Classifications

• G03G9/09725

  Silicon-oxides; Silicates · CPC title

• G03G9/0819

  characterised by the dimensions of the particles · CPC title

• G03G9/0926

  characterised by physical or chemical properties · CPC title

• G03G9/0821 Primary

  characterised by physical parameters (magnetic parameters G03G9/083) · CPC title

• G03G9/0827 Primary

  characterised by their shape, e.g. degree of sphericity · CPC title