Toner

Patent metadata

Field	Value
Publication number	US-9829816-B2
Application number	US-201514736991-A
Country	US
Kind code	B2
Filing date	Jun 11, 2015
Priority date	Jun 20, 2014
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

Provided is a toner for which the heat-resistant storability and the low-temperature fixability are able to co-exist at higher levels and for which the temporal stability of the low-temperature fixability is also excellent. The toner has a toner particle that contains a binder resin and a pigment, and this binder resin contains a polyester resin that has a specific structure and specific properties.

First claim

What is claimed is:

1. A toner comprising a toner particle, said toner particle comprising:
a pigment, the pigment being at least one member selected from the group consisting of an organic pigment and a carbon black; and
a binder resin, the binder resin comprising styrene-acrylic resin, and a crystalline polyester resin, the crystalline polyester resin being obtained by condensation polymerization of a monomer (a) selected from monomer group A described below and a monomer (b) selected from monomer group B described below, wherein
the crystalline polyester resin has a content X (mol %) of the unit derived from the monomer (b), as calculated by formula (1) of from 3.0 to 12.0 mol %:
X={Mb /( Ma +Mb )}×100   (1)

where Ma (mol/g) is the number of moles of the unit derived from the monomer (a) per unit mass, and Mb (mol/g) is the number of moles of the unit derived from the monomer (b) per unit mass, and
a melting point of the crystalline polyester resin is from 50 to 85° C.,
monomer group A comprises a C 2-11 α,ω-straight-chain aliphatic diol, a C 2-13 α,ω-straight-chain aliphatic dicarboxylic acid, a C 2-12 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid, an intramolecular anhydride of a C 2-13 α,ω-straight-chain aliphatic dicarboxylic acid, an alkylester of a C 2-13 α,ω-straight-chain aliphatic dicarboxylic acid, an alkylester of a C 2-12 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid, or a lactonized compound of a C 2-12 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid, and
monomer group B comprises a C 12-22 α,ω-straight-chain aliphatic diol, a C 14-24 α,ω-straight-chain aliphatic dicarboxylic acid, a C 13-23 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid, an intramolecular anhydride of a C 14-24 α,ω-straight-chain aliphatic dicarboxylic acid, an alkylester of a C 14-24 α,ω-straight-chain aliphatic dicarboxylic acid, an alkylester of a C 13-23 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid, or a lactonized compound of a C 13-23 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid.

2. The toner according to claim 1 , wherein the toner particle contains the crystalline polyester resin at from 3.0 to 30.0 mass% based on the total mass of the binder resin.

3. The toner according to claim 1 , wherein the crystalline polyester resin is a ternary copolymer.

4. The toner according to claim 1 , wherein the monomer group A comprises the C 2-10 α,ω-straight-chain aliphatic diol, the C 2-12 α,ω- straight-chain aliphatic dicarboxylic acid, or the C 2-11 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid.

5. The toner according to claim 1 , wherein the organic pigment is a cyan pigment, a magenta pigment, or a yellow pigment.

6. The toner according to claim 1 , wherein the monomer group A comprises the C 2-11 α,ω-straight-chain aliphatic diol, a C 5-13 α,ω-straight-chain aliphatic dicarboxylic acid, or the C 2-12 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid.

7. The toner according to claim 1 , wherein the monomer group A comprises the C 2-11 α,ω-straight-chain aliphatic diol, a C 10-13 α,ω-straight-chain aliphatic dicarboxylic acid, or the C 2-12 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid.

Assignees

• Canon Kk

Inventors

• Tanaka Masatake
• Nakagawa Yoshihiro
• Isono Naoya
• Shimano Tsutomu
• NOJI Shintaro
• Yoshida Yu
• Kaburagi Takeshi
• Shibahara Shohei

Classifications

• G03G9/0906

  Organic dyes · CPC title

• G03G9/08795

  characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants · CPC title

• G03G9/08755 Primary

  Polyesters · CPC title

• G03G9/08797

  characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature · CPC title

• G03G9/08711

  with esters of acrylic or methacrylic acid · CPC title