Toner and method for producing toner

Patent metadata

Field	Value
Publication number	US-12078960-B2
Application number	US-202117493309-A
Country	US
Kind code	B2
Filing date	Oct 4, 2021
Priority date	Oct 5, 2020
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

A toner including toner particles having a resin component containing a crystalline resin and an amorphous resin, in which the resin component contains a tetrahydrofuran-insoluble component, and the content of the tetrahydrofuran-insoluble component with respect to the content of the resin component is 5.0% to 80.0% by mass, wherein a maximum endothermic peak temperature of the tetrahydrofuran-insoluble component is 55.0 to 80.0° C., and the amount of heat absorption in the maximum endothermic peak of the tetrahydrofuran-insoluble component is 10.0 to 80.0 J/g, and toner particles have a structure which comprises a matrix containing the crystalline resin and domains containing the amorphous resin.

First claim

What is claimed is:

1. A toner, comprising:
toner particles containing:
a resin component containing:
a crystalline resin and an amorphous resin,

wherein the resin component contains a tetrahydrofuran-insoluble component, and
a content of the tetrahydrofuran-insoluble component with respect to a content of the resin component is 5.0% to 80.0% by mass,
wherein when a maximum endothermic peak temperature in a differential scanning calorimetry measurement (DSC measurement) of the tetrahydrofuran-insoluble component is defined as Tm [° C.], and when an amount of heat absorption in the maximum endothermic peak determined from DSC measurement of the tetrahydrofuran-insoluble component is defined as H(I) [J/g],
Tm [° C.] satisfies formula (1):
55.0≤ Tm≤ 80.0  (1), and

H(I) [J/g] satisfies formula (2):
10.0≤ H ( I )≤80.0  (2), and

wherein when cross sections of 100 particles of the toner particles are observed,
each of the cross sections has a domain-matrix structure which comprises a matrix containing the crystalline resin, and domains each of which contains the amorphous resin, and
among the 100 particles, the number of particle in which all the domains have a major diameter of 1.0 μm or less is 20 particles or more, and

wherein the crystalline resin comprises a vinyl polymer A containing a monomer unit A1 represented by formula (A):

where in formula (A), R 1 is H or CH 3 , and R 2 is an alkyl group having 18 to 36 carbon atoms.

2. The toner according to claim 1 ,
wherein when an amount of heat absorption in a maximum endothermic peak determined from DSC measurement of the toner is defined as H(T) [J/g], H(I) [J/g] and H(T) [J/g] satisfy formula (3):
3.0%≤ H ( I )/ H ( T )≤20.0%  (3).

3. The toner according to claim 1 ,
wherein a content of the monomer unit A1 with respect to a content of the vinyl polymer A is 30.0% to 99.9% by mass.

4. The toner according to claim 1 ,
wherein the vinyl polymer A further contains a monomer unit A2, and
wherein when an SP value of the monomer unit A1 is defined as SP A1 (J/cm 3 ) 0.5 , and
when an SP value of the monomer unit A2 is defined as SP A2 (J/cm 3 ) 0.5 SP A1 and SP A2 satisfy formula (4):
3.0≤SP A2 −SP A1 ≤25.0  (4).

5. The toner according to claim 1 ,
wherein the vinyl polymer A further contains a monomer unit A2,
the monomer unit A2 is at least one monomer unit selected from the group consisting of a monomer unit represented by formula (A21) below and a monomer unit represented by formula (A22) below:

where in formulae (A21) and (A22),
X is a single bond or an alkylene group having 1 to 6 carbon atoms,
R 4 is a cyano group (—C═N), —C(═O)NHR 7 (where R 7 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms), a hydroxy group, —COOR 8 (where R 8 is an alkyl group having 1 to 6 carbon atoms or a hydroxyalkyl group having 1 to 6 carbon atoms), —NHCOOR 9 (where R 9 is an alkyl group having 1 to 4 carbon atoms), —NH—C(═O)—NH(R 10 ) 2 (where each R 10 is independently a hydrogen atom or alkyl group having 1 to 6 carbon atoms), —COO(CH 2 ) 2 NHCOOR 11 (where R 11 is an alkyl group having 1 to 4 carbon atoms) or —COO(CH 2 ) 2 —NH—C(═O)—NH(R 12 ) 2 (where each R 12 is independently hydrogen atom or an alkyl group having 1 to 6 carbon atoms),
R 6 is an alkyl group having 1 to 4 carbon atoms, and
R 3 and R 5 are each independently a hydrogen atom or CH 3 .

6. The toner according to claim 4 ,
wherein a content of the monomer unit A2 with respect to a content of the vinyl polymer A is 1.0% to 70.0% by mass.

7. The toner according to claim 5 ,
wherein a content of the monomer unit A2 with respect to a content of the vinyl polymer A is 1.0% to 70.0% by mass.

8. The toner according to claim 5 ,
wherein the vinyl polymer A further contains a monomer unit A3,
the monomer unit A3 is at least one monomer unit selected from the group consisting of a monomer unit represented by formula (A31) and a monomer unit represented by formula (A32):

where in formula (A32), R 13 is H or CH 3 .

9. The toner according to claim 1 ,
wherein a content of the tetrahydrofuran-insoluble component with respect to a content of the resin component is 30.0% to 80.0% by mass.

Assignees

• Canon Kk

Inventors

• Kagawa Hiroki
• Moribe Shuhei
• Watanabe Shuntaro
• Akiyama Hiroki

Classifications

• G03G9/0821

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

• G03G9/08755

  Polyesters · CPC title

• G03G9/0815

  Post-treatment · CPC title

• G03G9/081

  by mixing the toner components in a liquefied state; melt kneading; reactive mixing · CPC title

• C08G63/183

  Terephthalic acids · CPC title