Toner

Patent metadata

Field	Value
Publication number	US-2022171301-A1
Application number	US-202117526486-A
Country	US
Kind code	A1
Filing date	Nov 15, 2021
Priority date	Nov 30, 2020
Publication date	Jun 2, 2022
Grant date	—

Abstract

The toner contains a toner particle having a core-shell structure including: a core containing a binder resin and a colorant; and a shell, wherein the toner contains a crystalline material, and the shell contains an amorphous thermoplastic resin; and when SP values of the crystalline material and the amorphous thermoplastic resin, which are calculated by the Fedors method, are defined as SPc (J/cm3)0.5 and SPa (J/cm3)0.5, respectively, the SPc and the SPa (J/cm3) satisfy a particular relationship, and when the toner is observed by SEM after the toner has been subjected to ruthenium staining that treats the toner in an atmosphere of RuO4 gas having 500 Pa for 15 minutes, a ratio S2 (%) of an area occupied by the crystalline material per area of the toner satisfies a particular relationship.

First claim

What is claimed is:

1 . A toner containing a toner particle having a core-shell structure comprising:
a core containing a binder resin and a colorant; and a shell, wherein the toner contains a crystalline material, and the shell contains an amorphous thermoplastic resin; when an SP value of the crystalline material calculated by the Fedors method is defined as SPc (J/cm 3 ) 0.5 , and an SP value of the amorphous thermoplastic resin calculated by the Fedors method is defined as SPa (J/cm 3 ) 0.5 , the SPc and the SPa satisfy the following expression (1):
2.50 ≤ SPa−SPc≤ 4.50  (1), and

when the toner is observed by a scanning electron microscope (SEM) after the toner has been subjected to ruthenium staining that treats the toner in an atmosphere of RuO 4 (ruthenium tetroxide) gas having 500 Pa for 15 minutes, and a ratio of an area occupied by the crystalline material per area of the toner is defined as S2(%), the S2(%) satisfies the following expression (2):
1.0 ≤ S≤ 20.0  (2).

2 . The toner according to claim 1 , wherein the toner has a viscosity, at 100° C. measured by a flow tester temperature raising method, of 0.5×10 4 to 9.0×10 5 Pa·s.

3 . The toner according to claim 1 , wherein the SPa is 11.60 to 12.40 (J/cm 3 ) 0.5 .

4 . The toner according to claim 1 , wherein the amorphous thermoplastic resin is an amorphous polyester.

5 . The toner according to claim 4 , wherein the amorphous polyester has an isosorbide unit represented by the following formula (3):

6 . The toner according to claim 5 , wherein the amorphous polyester is a condensate of only
at least one alcohol component selected from the group consisting of dihydric and trihydric or higher alcohols, and at least one carboxylic acid component selected from the group consisting of aromatic polycarboxylic acids, aliphatic polycarboxylic acids and anhydrides thereof, wherein the alcohol component comprises isosorbide; the alcohol component and the carboxylic acid component do not have an ester group; and the amorphous polyester contains the isosorbide unit represented by the formula (3) derived from the isosorbide in an amount of 0.10 to 30.00 mol % based on all of the monomer unit derived from the alcohol component and the monomer unit derived from the carboxylic acid component.

7 . The toner according to claim 1 , wherein the colorant is a hydrophobized colorant the surface of which is subjected to hydrophobizing treatment with a silane coupling agent.

8 . The toner according to claim 7 , wherein the hydrophobized colorant is a hydrophobized magnetic material.

9 . The toner according to claim 8 , wherein the hydrophobized magnetic material has, in a spectrum of Si obtained based on a total electron yield method (TEY) using a near-edge X-ray absorption fine structure (NEXAFS),
a peak A in a range of 1844.4 to 1844.8 eV, and a peak B in a range of 1846.1 to 1846.6 eV; and I A /(I A +I B )/M Si is 40 to 55, where, I A represents an area of the peak A, I B represents an area of the peak B, and M Si represents the number of moles of Si derived from the silane compound contained in 1 g of the hydrophobized magnetic material.

Assignees

• Canon Kk

Inventors

• Suzumura Yoshitaka
• Nozaki Dai
• Unno Tomohiro

Classifications

• G03G9/08

  with toner particles · CPC title

• G03G9/09314 Primary

  Macromolecular compounds · CPC title

• G03G9/0935

  specified by the core material · CPC title

• C08G63/672

  Dicarboxylic acids and dihydroxy compounds · CPC title

• G03G9/09392

  Preparation thereof · CPC title