Toner
The toner has a toner particle that contains a binder resin, a colorant, a release agent, and a crystalline polyester, wherein the release agent contains an ester wax, and the peak top temperature of the maximum endothermic peak of the ester wax as measured with a differential scanning calorimeter is from 65° C. to 85° C., the ester wax satisfies specific conditions and the crystalline polyester satisfies specific conditions, the toner contains from 3.0 parts by mass to 20.0 parts by mass of the crystalline polyester per 100 parts by mass of the binder resin, and the mass ratio of the ester wax to crystalline polyester is from 25/75 to 75/25.
1. A toner comprising a toner particle, said toner particle comprising:
a binder resin;
a colorant;
a release agent comprising an ester wax having a peak top temperature of a maximum endothermic peak of 65 to 85° C. measured with a differential scanning calorimeter, the ester wax comprising ester compounds each having two ester bonds in the individual molecule, the ester compounds each having one partial structure represented by formula (1-1) and two partial structures each represented by formula (2-2)
—O—C x H 2x —O— (1-1)
where x represents an integer from 6 to 12 and y represents an integer from 4 to 10, or
two partial structures each represented by formula (1-2) and one partial structure represented by formula (2-1)
C x H 2x+1 —O— (1-2)
where x represents an integer from 6 to 12 and y represents an integer from 4 to 10,
the content of the ester compounds being at least 90% by mass based on a total mass of the ester wax, with ester compound S-22 prepared from docosanol and decanedioic acid, or ester compound N-22 prepared from 1,9-nonanediol and docosanoic acid having a largest content of any of the ester compounds contained in the ester wax, said largest content being from 70 to 80% by mass based on a total mass of the ester wax in a composition distribution measured by GC-MASS or MALDI TOF MASS, and
the toner particle further comprising a crystalline polyester that satisfies condition (iii) or (iv)
(iii) the crystalline polyester has a partial structure represented by formula (3), and the content of the partial structure represented by formula (3) is at least 90 mol % based on a total number of moles of a partial structure derived from a diol component in the crystalline polyester
—O—C x H 2x —O— (3)
where x represents an integer from 6 to 12, or
(iv) the crystalline polyester has a partial structure represented by formula (4), and the content of the partial structure represented by formula (4) is at least 90 mol % based on a total number of moles of a partial structure derived from a dicarboxylic acid component in the crystalline polyester
where y represents an integer from 4 to 10, wherein
the toner contains 3.0 to 20.0 parts by mass of the crystalline polyester per 100 parts by mass of the binder resin, and a mass ratio of the ester wax to crystalline polyester (ester wax/crystalline polyester) is from 25/75 to 75/25.
2. The toner according to claim 1 , wherein the binder resin comprises a styrene-acrylic acid copolymer as a main component.
3. The toner according to claim 1 , wherein the total content of ester compounds having a molecular weight M that satisfies 0.8×M1≤M≤1.2×M1 is at least 90% by mass based on a total amount of the ester wax, where M1 is the molecular weight of the ester compound having the largest content in the ester wax.
4. The toner according to claim 1 , wherein an acid value of the crystalline polyester is not more than 8.0 mg KOH/g.
5. The toner according to claim 1 , wherein the acid value of the crystalline polyester is not more than 5.0 mg KOH/g.
6. The toner according to claim 1 , wherein the acid value of the crystalline polyester is not more than 3.5 mg KOH/g.
7. The toner according to claim 1 , wherein ester compound S-22 has the largest content of any of the ester compounds contained in the ester wax.
8. The toner according to claim 1 , wherein ester compound N-22 has the largest content of any of the ester compounds contained in the ester wax.