Toner

Patent metadata

Field	Value
Publication number	US-2016349646-A1
Application number	US-201615149817-A
Country	US
Kind code	A1
Filing date	May 9, 2016
Priority date	May 27, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

Provided is a toner including toner particles each containing: a binder resin, a crystalline polyester, and a colorant, in which: the colorant includes a compound represented by the following formula (1); and the binder resin and the crystalline polyester satisfy the following formula (2):

in the formula (1), R 1 , R 2 , and R 3 each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and Ar represents an aryl group.
Δ SP=|SP 1− SP 2|≦0.43  Formula (2)

First claim

What is claimed is:

1 . A toner, comprising a toner particle comprising:
a binder resin, a crystalline polyester, and a colorant,
wherein:
the colorant comprises a compound represented by the following formula (1); and
the binder resin and the crystalline polyester satisfy the following formula (2):

in the formula (1), R 1 , R 2 , and R 3 each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and Ar represents a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group,
Δ SP=|SP 1− SP 2|≦0.43  Formula (2)

in the formula (2),
SP1 represents a solubility parameter of the binder resin according to the equation of Fedors, and
SP2 represents a solubility parameter of the crystalline polyester according to the equation of Fedors.

2 . A toner according to claim 1 , wherein the crystalline polyester is a resin having a crystalline polyester moiety and an amorphous moiety.

3 . A toner according to claim 2 , wherein the crystalline polyester moiety has a structural unit represented by the following formula (4):

in the formula (4), m represents an integer of from 4 to 10, and n represents an integer of from 4 to 12.

4 . A toner according to claim 2 , wherein the amorphous moiety is one of a polystyrene, a polyester, and a polyurethane.

5 . A toner according to claim 4 , wherein the amorphous moiety is the polystyrene and the binder resin is a styrene vinyl resin.

6 . A toner according to claim 4 , wherein:
the crystalline polyester is a block polymer having the crystalline polyester moiety and the amorphous moiety that comprises the polystyrene; and the crystalline polyester moiety has a unit derived from a divalent acid monomer represented by the following formula (5) and a unit derived from a dihydric alcohol monomer represented by the following formula (6):
HOOC—(CH 2 ) m —COOH  Formula (5)

HO—(CH 2 ) n —OH  Formula (6)

in the formula (5), m represents an integer of from 4 to 10, and in the formula (6), n represents an integer of from 4 to 12.

7 . A toner according to claim 4 , wherein the amorphous moiety is one of the polyester and the polyurethane, and the binder resin is a polyester resin.

8 . A toner according to claim 7 , wherein the amorphous moiety is the polyester.

9 . A toner according to claim 2 , wherein a mass ratio (crystalline polyester moiety/amorphous moiety) of the crystalline polyester moiety to the amorphous moiety in the crystalline polyester is 50/50 or more and 95/5 or less.

10 . A toner according to claim 1 , wherein a content of the crystalline polyester is 0.5 mass % or more and 30 mass % or less with respect to a total amount of the binder resin and the crystalline polyester.

11 . A toner according to claim 1 , wherein the crystalline polyester has a weight-average molecular weight (Mw) of 10,000 or more and 50,000 or less.

12 . A toner according to claim 1 , wherein the crystalline polyester has a melting point of 50° C. or more and 90° C. or less.

13 . A toner according to claim 1 , wherein a content of the compound represented by the formula (1) is 0.5 mass % or more and 10.0 mass % or less with respect to a total amount of the binder resin and the crystalline polyester.

14 . A toner according to claim 1 , wherein the colorant further contains a yellow pigment.

15 . A toner according to claim 14 , wherein a mass ratio (compound represented by the formula (1)/yellow pigment) of the compound represented by the formula (1) to the yellow pigment is 7/93 or more and 65/35 or less.

16 . A toner according to claim 1 , wherein the compound represented by the formula (1) is a compound represented by the following formula (3):

in the formula (3), R 1 , R 2 , and R 3 each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and R 4 and R 5 each independently represent a hydrogen atom or an alkyl group having 1 to 12 carbon atoms.

Assignees

• Canon Kk

Inventors

• Yoshida Yu
• Kawamura Masashi
• Terui Yuhei
• Toyoda Takayuki
• Sekiguchi Takeshi

Classifications

• G03G9/091 Primary

  Azo dyes · CPC title