Toner and method for producing toner

Patent metadata

Field	Value
Publication number	US-2022365457-A1
Application number	US-202217659273-A
Country	US
Kind code	A1
Filing date	Apr 14, 2022
Priority date	Apr 21, 2021
Publication date	Nov 17, 2022
Grant date	—

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 comprising a polyester resin, wherein
the toner has a softening point determined by a constant-load extrusion type capillary rheometer of 150° C. or less, the toner particle comprises the polyester resin within 100 nm from a surface of the toner particle, 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 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, where a standard value of a peak having a maximum standard value among the one or more present peaks is denoted by A(dmax) and the standard value on the toner particle surface is denoted by A(0), the A(dmax) and the A(0) satisfy following formulas (1) and (2):

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

3 . The toner according to claim 1 , wherein
where a standard value at a position at a depth of 100 nm from the surface of the toner particle from among the standard values is denoted by A(100), the A(dmax) and the A(100) satisfy a following formula (3):
1.15≤ A ( d max)/ A (100)≤5.00  (3).

4 . The toner according to any one of claim 1 , wherein
a content ratio of a monomer unit represented by a following formula (B) in the polyester resin is from 30.0% by mass to 50.0% by mass with respect to the mass of the polyester resin, a content ratio of a monomer unit represented by a following formula (C) in the polyester resin is from 25.0% by mass to 50.0% by mass with respect to the mass of the polyester resin, and a content ratio of a monomer unit represented by a following formula (D) in the polyester resin is from 1.0% by mass to 50.0% by mass with respect to the mass of the polyester resin;

(in the formula (B), R 1 represents a benzene ring)

(in the formula (C), R 2 represents an ethylene group or a propylene group, x and y are each an integer of 1 or more, and an average value of x+y in the polyester resin is 2 to 10):
O—R 3 —   (D)

(in the formula (D), R 3 represents an ethylene group or a propylene group).

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

6 . The toner according to any one of claim 1 , wherein the A(0) satisfies a following formula (4):
0.010≤ A (0)≤0.100  (4).

7 . The toner according to any one of claim 1 , wherein the A(100) satisfies a following formula (5):
0.010≤ A (100)≤0.100  (5).

8 . The toner according to any one of claim 1 , wherein
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, two or more peaks are obtained, and where a standard value of the peak showing a maximum peak intensity among the two or more peaks is denoted by S(1) and a standard value of the peak showing a second largest peak intensity is denoted by S(2), the S(1) and S(2) satisfy a following formula (6):
0.40≤ S (2)/ S (1)<1.00  (6).

9 . The toner according to any one of claim 1 , wherein
the toner particle has a core-shell structure having a core and a shell covering the core, the core comprises a styrene-acrylic resin, and the shell comprises the polyester resin.

10 . The toner according to claim 9 , wherein the amount of the polyester resin is from 1.0 part by mass to 10.0 parts by mass with respect to 100 parts by mass of the styrene-acrylic resin.

11 . The toner according to claim 9 , wherein a thickness of the shell is from 100 nm to 200 nm in a cross section of the toner observed with a transmission electron microscope.

12 . The toner according to any one of claim 9 , wherein
the core includes a crystalline material, in the cross section of the toner observed with a transmission electron microscope, an average number of domains of the crystalline material is from 8 to 500, a number average diameter of major axes of the domains of the crystalline material is from 50 nm to 300 nm, 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 from 60% by number to 100% by number with respect to a total number of domains present in the cross section.

13 . The toner according to any one of claim 9 , wherein the amount of the crystalline material is from 5.00 parts by mass to 50.00 parts by mass with respect to 100 parts by mass of the styrene-acrylic resin.

14 . A method for producing a toner, the method comprising:
a step of obtaining resin particles comprising a polyester resin; a dispersion step of obtaining a suspension in which the obtained resin particles are dispersed in an aqueous medium; a treatment step of treating the suspension at pH(1) at 95° C. or higher and then treating at pH(2); a cooling step of cooling the suspension treated in the treatment step at a cooling rate of 50° C./min or more, wherein the pH(1) and the pH(2) satisfy following formulas (10) and (11):
pH(1)<pH(2)  (10)

6.0≤pH(2)≤10.5  (11).

Assignees

• Canon Kk

Inventors

• Unno Tomohiro
• Nozaki Dai
• Suzumura Yoshitaka

Classifications

• G03G9/09328 Primary

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

• G03G9/09364

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

• G03G9/0926

  characterised by physical or chemical properties · CPC title

• G03G9/0823

  Electric parameters · CPC title

• G03G9/0825

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