Toner and method of producing toner

• US 10,146,146 B2
• Filed: 04/24/2017
• Issued: 12/04/2018
• Est. Priority Date: 04/28/2016
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Komatsu, Nozomu, Hashimoto, Takeshi, Hama, Masayuki, Kobori, Takakuni, Kanno, Ichiro, Onozaki, Yuto, Sano, Hitoshi, Matsubara, Akifumi, Fujikawa, Hiroyuki, Fujisaki, Tsubasa
• Primary Examiner(s): Vajda, Peter L
• Application Number:
  US15/495,196
• Publication Number:
  US 20170315461A1
• Time in Patent Office: 589 Days
• CPC Class Codes: G03G 9/0804 whereby the components are brought together in a liquid dispersing medium
• CPC Class Codes: G03G 9/081 by mixing the toner components in a liquefied state; melt kneading; reactive mixing
• CPC Class Codes: G03G 9/0819 characterised by the dimensions of the particles
• CPC Class Codes: G03G 9/0825 characterised by their structure; characterised by non-homogenuous distribution of components microcapsular toners G03G9/093
• CPC Class Codes: G03G 9/08755 Polyesters
• CPC Class Codes: G03G 9/08795 characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants
• CPC Class Codes: G03G 9/08797 characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature
• CPC Class Codes: G03G 9/0918 Phthalocyanine dyes
• CPC Class Codes: G03G 9/09708 Inorganic compounds
• CPC Class Codes: G03G 9/09716 treated with organic compounds
• CPC Class Codes: G03G 9/09725 Silicon-oxides; Silicates

Abstract

A toner comprising a toner particle containing a binder resin, a wax, and inorganic fine particles, wherein the binder resin contains a crystalline polyester resin and an amorphous polyester resin, and, in a cross section of the toner particle, when Sc represents an area taken up by the crystalline polyester resin and S1 represents an area taken up by the inorganic fine particles that are present in the crystalline polyester resin portion, Sc and S1 satisfy the relationship S1/Sc≥0.2.

Claims

1. A toner comprising a toner particle comprising a binder resin, a wax and inorganic fine particles, the binder resin comprising a crystalline polyester resin and an amorphous polyester resin, wherein

the content of the inorganic fine particles in the toner particle is 0.5 to 5.0 mass parts per 100 mass parts of the binder resin, and

in a cross section of the toner particle, S1/Sc≥

0.3 when Sc represents an area taken up by the crystalline polyester resin and S1 represents an area taken up by the inorganic fine particles that are present in the crystalline polyester resin portion.

2. The toner according to claim 1, wherein in a cross section of the toner particle, 0.01 ≤

Sc/St≤

0.40 when St represents a cross-sectional area of the toner particle, and

in a cross section of the toner particle, S1/S2≥

0.6 when S2 represents a total area taken up by the inorganic fine particles.

3. The toner according to claim 1, wherein the number-average particle diameter (D1) of primary particles of the inorganic fine particles in the toner particle is 6 to 300 nm.

4. The toner according to claim 1, wherein the inorganic fine particles are silica particles or alumina particles.

7. The toner according to claim 1, wherein the content of the crystalline polyester resin in the toner particle is 1 to 40 mass parts per 100 mass parts of the amorphous polyester resin.

5. A method of producing a toner comprising a toner particle comprising a binder resin, a wax and inorganic fine particles, the binder resin comprising a crystalline polyester resin and an amorphous polyester resin, the method comprising the steps of:

obtaining a resin composition by dispersing the inorganic fine particles in the melted crystalline polyester resin;

dispersing fine particles of the resin composition, fine particles of the amorphous polyester resin, and fine particles of the wax;

forming an aggregate particle containing the fine particles of the resin composition, the fine particles of the amorphous polyester resin, and the fine particles of the wax; and

inducing fusion of the aggregate particle, wherein

the content of the inorganic fine particles in the toner particle is 0.5 to 5.0 mass parts per 100 mass parts of the binder resin, and

in a cross section of the toner particle, S1/Sc≥

0.3 when Sc represents an area taken up by the crystalline polyester resin and Si represents an area taken up by the inorganic fine particles that are present in the crystalline polyester resin portion.

6. A method of producing a toner comprising a toner particle comprising a binder resin, a wax and inorganic fine particles, the binder resin comprising a crystalline polyester resin and an amorphous polyester resin, the method comprising the steps of:

obtaining a resin composition by dispersing the inorganic fine particles in the melted crystalline polyester resin;

obtaining a kneaded material by melt-kneading a mixture containing the resin composition, the amorphous polyester resin, and the wax; and

cooling and pulverizing the kneaded material, wherein

the content of the inorganic fine particles in the toner particle is 0.5 to 5.0 mass parts per 100 mass parts of the binder resin, and

in a cross section of the toner particle, S1/Sc≥

0.3 when Sc represents an area taken up by the crystalline polyester resin and Si represents an area taken up by the inorganic fine particles that are present in the crystalline polyester resin portion.