TONER

• US 20200133152A1
• Filed: 10/24/2019
• Published: 04/30/2020
• Est. Priority Date: 10/30/2018
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Tsubaki, Keiichiro, Isono, Naoya, Murai, Yasuaki
• Granted Patent: US 10,948,839 B2
• Time in Patent Office: Days
• CPC Class Codes: G03G 9/08711 with esters of acrylic or methacrylic acid
• CPC Class Codes: G03G 9/08793 Crosslinked polymers
• 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

Abstract

The toner contains a toner particle that has a binder resin, wherein an amount of a tetrahydrofuran THF-insoluble matter A collected when a THF dispersion of the binder resin is passed through a first filter having an average pore diameter of 8 μm, is not more than 10 mass % of the binder resin, and an amount of a THF-insoluble matter B collected when the THF dispersion that has been passed through the first filter is passed through a second filter having an average pore diameter of 0.8 μm, is from 5 mass % to 50 mass % of the binder resin.

Claims

1. A toner comprising a toner particle that has a binder resin, wherein

an amount of a tetrahydrofuran THF-insoluble matter A collected when a THF dispersion of the binder resin is passed through a first filter having an average pore diameter of 8 μ

m, is not more than 10 mass % of the binder resin, and

an amount of a THF-insoluble matter B collected when the THF dispersion that has been passed through the first filter is passed through a second filter having an average pore diameter of 0.8 μ

m, is from 5 mass % to 50 mass % of the binder resin.

2. The toner according to claim 1, wherein a degree of THF swelling of the THF-insoluble matter B is from 2.0 to 20.0.

3. The toner according to claim 1, wherein the THF-insoluble matter B has a structure crosslinked by a crosslinking agent having at least 10 crosslinking functional groups in the molecule.

4. The toner according to claim 1, wherein the THF-insoluble matter B has a structure crosslinked by a crosslinking agent having a dendritic structure.

5. The toner according to claim 4, wherein the crosslinking agent having a dendritic structure is a crosslinking agent provided by a Michael addition reaction of a polyvalent mercapto compound represented by the following formula (2) to a multifunctional (meth)acrylate compound represented by the following formula (1),

6. The toner according to claim 3, wherein the crosslinking agent is a dendritic acrylate or a dendritic methacrylate.

7. The toner according to claim 1, wherein the binder resin contains a styrene acrylic resin.

8. The toner according to claim 1, wherein

the binder resin contains a copolymer of a crosslinking agent, a styrenic polymerizable monomer, and at least one selected from the group consisting of acrylic polymerizable monomers and methacrylic polymerizable monomers, and

the crosslinking agent is a crosslinking agent provided by a Michael addition reaction of a polyvalent mercapto compound represented by the following formula (2) to a multifunctional (meth)acrylate compound represented by the following formula (1),