Toner and method of producing toner

Patent metadata

Field	Value
Publication number	US-2016154331-A1
Application number	US-201514943813-A
Country	US
Kind code	A1
Filing date	Nov 17, 2015
Priority date	Nov 28, 2014
Publication date	Jun 2, 2016
Grant date	—

Abstract

Provided is toner comprising toner particle containing binder resin and colorant and silica fine particle, wherein: the silica fine particle contains silica fine particle A and silica fine particle B; silica fine particle A has a number average particle diameter of primary particle of 5 nm or more and 20 nm or less; silica fine particle B has a number average particle diameter of primary particle of 80 nm or more and 200 nm or less; and silica fine particle B has a half width of a peak of primary particle of 25 nm or less, in a weight-based particle size distribution, and wherein when the toner is measured by adhesive force-measuring method by using polycarbonate thin film, an adhesion of the silica fine particle A is 0.5% by area or less relative to 100% by area of the total area of the polycarbonate thin film.

First claim

What is claimed is:

1 . A toner, comprising:
a toner particle containing a binder resin and a colorant; and a silica fine particle, wherein: the silica fine particle contains a silica fine particle A and a silica fine particle B; the silica fine particle A has a number average particle diameter (D 1 ) of primary particle of 5 nm or more and 20 nm or less; the silica fine particle B has a number average particle diameter (D 1 ) of primary particle of 80 nm or more and 200 nm or less; and the silica fine particle B has a half width of a peak of primary particle of 25 nm or less, in a weight-based particle size distribution, and wherein when the toner is measured by an adhesive force-measuring method by using a polycarbonate thin film, an adhesion of the silica fine particle A is 0.5% by area or less relative to 100% by area of the total area of the polycarbonate thin film.

2 . A toner according to claim 1 , wherein the toner particle has an average circularity of 0.960 or more.

3 . A toner according to claim 1 , wherein an amount of the silica fine particle A is 0.5 part by mass or more and 1.5 parts by mass or less with respect to 100 parts by mass of the toner particle.

4 . A toner according to claim 1 , wherein an amount of the silica fine particle B is 0.1 part by mass or more and 1.0 part by mass or less with respect to 100 parts by mass of the toner particle.

5 . A toner according to claim 1 , wherein the silica fine particle A
is subjected to surface treatment with 5.0 parts by mass or more and 40.0 parts by mass or less of a silicone oil with respect to 100 parts by mass of a base material silica, and has a carbon amount-based fixation ratio (%) of the silicone oil of 70% or more.

6 . A toner according to claim 1 , wherein the silica fine particle A has an apparent density of 15 g/L or more and 50 g/L or less.

7 . A toner according to claim 1 , wherein the silica fine particle A is obtained by treating a base material silica with a silicone oil, and then treating the base material silica with at least one of an alkoxysilane or a silazane.

8 . A method of producing a toner, the method comprising:
a step 1 of externally adding a silica fine particle B to a toner particle containing a binder resin and a colorant; and a step 2 of externally adding a silica fine particle A to the toner, the silica fine particle A having a number average particle diameter (D 1 ) of primary particle of 5 nm or more and 20 nm or less, the silica fine particle B having a number average particle diameter (D 1 ) of primary particle of 80 nm or more and 200 nm or less, the silica fine particle B having a half width of a peak of primary particle of 25 nm or less, in a weight-based particle size distribution, the step 2 comprising a step of loading the product obtained in the step 1 and the silica fine particle A into a container of a mixing treatment apparatus, followed by treatment, the mixing treatment apparatus comprising
a stirring member including a rotary shaft and a plurality of stirring blades arranged on a surface of the rotary shaft,
a container having a cylindrical inner peripheral surface in which the stirring member is stored, and
a driver section configured to apply a rotary driving force to the rotary shaft to rotate the stirring member in the container,
the plurality of stirring blades being each arranged to have a gap between the stirring blade and the inner peripheral surface of the container, the plurality of stirring blades including
a first stirring blade configured to feed a mixing-treated product loaded into the container toward one orientation in an axial direction of the rotary shaft through rotation of the stirring member, and
a second stirring blade configured to feed the mixing-treated product toward another orientation in the axial direction of the rotary shaft through the rotation.

9 . A method of producing a toner according to claim 8 , wherein the silica fine particle A is obtained by treating a base material silica with a silicone oil, and then treating the base material silica with at least one of an alkoxysilane or a silazane.

Assignees

• Canon Kk

Inventors

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

Classifications

• G03G9/09725

  Silicon-oxides; Silicates · CPC title

• G03G9/0819 Primary

  characterised by the dimensions of the particles · CPC title

• G03G9/0802

  Preparation methods · CPC title

• G03G9/0827

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