Toner and method for producing toner

Patent metadata

Field	Value
Publication number	US-12405544-B2
Application number	US-202217659273-A
Country	US
Kind code	B2
Filing date	Apr 14, 2022
Priority date	Apr 21, 2021
Publication date	Sep 2, 2025
Grant date	Sep 2, 2025

Abstract

A toner and a method for producing the toner, wherein; the toner comprising a toner particle comprising a polyester resin, and has a softening point of 150° C. or less; the toner particle has the polyester resin within 100 nm from a surface of the toner particle, and where a value obtained by dividing an amount of counted ions for a structure represented by following formula (A) measured from the surface of the toner particle to a depth of 100 nm by TOF-SIMS by a total amount of counted ions is taken as a standard value, one or more peaks of the standard value are present within a range of 100 nm from the surface of the toner particle, and where A(dmax) denotes a standard value at a maximum peak and A(0) denotes a standard value on the toner particle surface, formula 1.15≤A(dmax)/A(0)≤5.00 is satisfied.

First claim

What is claimed is:

1. A toner, comprising:
a toner particle having a core-shell structure comprising a core and a shell covering the core, a thickness of the shell being 100 to 200 nm in a cross section of the toner observed with a transmission electron microscope;
the core comprising a styrene-acrylic resin and a crystalline material;
the crystalline material being an ester wax in an amount of 5.00 to 50.00 parts by mass with respect to 100 parts by mass of the styrene-acrylic resin; and
the shell comprising an amorphous polyester resin within 100 nm from a surface of the toner particle, a content ratio of a monomer unit represented by formula (B) in the amorphous polyester resin being 30.0 to 50.0% by mass with respect to the mass of the amorphous polyester resin, a content ratio of a monomer unit represented by formula (C) in the amorphous polyester resin being 25.0 to 50.0% by mass with respect to the mass of the amorphous polyester resin, and a content ratio of a monomer unit represented by formula (D) in the amorphous polyester resin being 1.0 to 50.0% by mass with respect to the mass of the amorphous polyester resin

where R 1 represents a benzene ring, R 2 represents an ethylene or a propylene group, x and y are each an integer of 1 or more and an average value of x+y is 2 to 10, and R 3 represents an ethylene or a propylene group, wherein

the toner has a softening point determined by a constant-load extrusion type capillary rheometer of 150° C. or less,
where a value obtained by dividing an amount of counted ions for a structure represented by formula (A) measured from the surface of the toner particle to a depth of 100 nm by time-of-flight secondary ion mass spectrometry by a total amount of counted ions is taken as a standard value

one or more peaks of the standard value are present within a range of 100 nm from the surface of the toner particle, and
1.15≤ A ( d max)/ A (0)≤5.00 and 0.010≤ A (0)

where A(dmax) is a standard value of a peak having a maximum standard value among the one or more present peaks and A(0) is a standard value on the toner particle surface.

2. The toner according to claim 1 , wherein 1.15≤A(dmax)/A(100)≤5.00 when A(100) is a standard value at a position at a depth of 100 nm from the surface of the toner particle from among the standard values.

3. The toner according to claim 1 , wherein the polyester resin has a dielectric loss tangent of 0.0070 to 0.0140 at 25° C. and 10,000 Hz.

4. The toner according to claim 1 , wherein 0.010≤A(0)≤0.100.

5. The toner according to claim 1 , wherein 0.010≤A(100)≤0.100.

6. The toner according to claim 1 , wherein at least two peaks are obtained when acetonitrile is used as a poor solvent and chloroform is used as a good solvent for a chloroform-soluble component of the polyester resin, and a component eluted during a linear change from a mobile phase composition of 100% by mass of acetonitrile to a mobile phase composition of 100% by mass of chloroform is analyzed by gradient polymer elution chromatography, and
0.40≤S(2)/S(1)<1.00 when S(1) is a standard value of the peak showing a maximum peak intensity among the two or more peaks and S(2) is a standard value of the peak showing a second largest peak intensity.

7. The toner according to claim 1 , wherein the amount of the polyester resin is 1.0 to 10.0 parts by mass with respect to 100 parts by mass of the styrene-acrylic resin.

8. The toner according to claim 1 , wherein in the cross section of the toner observed with a transmission electron microscope:
an average number of domains of the ester wax is 8 to 500,
a number average diameter of major axes of the domains of the ester wax is 50 to 300 nm, and
a proportion of the domains present in a region of 25% or less of a distance between a contour and a geometric center of the cross section from the contour of the cross section is 60 to 100% by number with respect to a total number of domains present in the cross section.

9. The toner according to claim 1 , wherein the ester wax is a condensate of stearic acid and stearyl alcohol.

Assignees

• Canon Kk

Inventors

• Unno Tomohiro
• Nozaki Dai
• Suzumura Yoshitaka

Classifications

• G03G9/09364

  obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• G03G9/0825

  characterised by their structure; characterised by non-homogenuous distribution of components (microcapsular toners G03G9/093) · CPC title

• G03G9/0823

  Electric parameters · CPC title

• G03G9/0821

  characterised by physical parameters (magnetic parameters G03G9/083) · CPC title

• G03G9/0926

  characterised by physical or chemical properties · CPC title