Toner
A toner comprising a toner particle comprising a binder resin including a polyester resin, and a polyolefin resin having a sulfonic acid group, wherein the polyolefin resin having a sulfonic acid group is a polymer in which a vinyl polymer is bonded to a polyolefin, a content ratio of a monomer unit containing a sulfonic acid group in the vinyl polymer is from 1.0 mass % to 20.0 mass %, in a FT-IR spectrum obtained through measurement of a large particle size toner and a small particle size toner resulting from dividing, on a number basis, the toner into two substantially equal parts, a ratio of an intensity of a maximum absorption peak in a range from 1130 cm −1 to 1170 cm −1 with respect to an intensity of a maximum absorption peak in a range from 1713 cm −1 to 1723 cm −1 exhibits a specific relationship.
1. A toner comprising a toner particle, said toner particle comprising:
a binder resin comprising a polyester resin; and
a polyolefin resin having a sulfonic acid group, the polyolefin resin being a polymer in which a vinyl polymer is bonded to a polyolefin; and
a content ratio of a monomer unit containing a sulfonic acid group in the vinyl polymer being 1.0 to 20.0 mass %, wherein
when the toner is divided using an inertial classification system into a first group having a large particle size and a second group having a small particle size so that the number of toner particles in the first and second groups are substantially equal, 1.10≤(As/Bs)/(Al/Bl)≤2.00
where As is a ratio of an intensity of a maximum absorption peak in a range from 1130 to 1170 cm −1 assigned to a sulfonic acid group contained in the polyolefin resin with respect to an intensity of a maximum absorption peak in a range from 1713 to 1723 cm −1 assigned to carbonyl in the polyester resin in a FT-IR spectrum obtained by measuring the second group by an ATR method using Ge as an ATR crystal where an infrared light incidence angle is 45°,
Bs is a ratio of an intensity of a maximum absorption peak in a range from 1130 to 1170 cm −1 assigned to a sulfonic acid group contained in the polyolefin resin with respect to an intensity of a maximum absorption peak in a range from 1713 to 1723 cm −1 assigned to carbonyl in the polyester resin in a FT-IR spectrum obtained by measuring the second group by an ATR method using diamond as an ATR crystal where an infrared light incidence angle is set to 45°,
Al is a ratio of an intensity of a maximum absorption peak in a range from 1130 to 1170 cm −1 assigned to a sulfonic acid group contained in the polyolefin resin with respect to an intensity of a maximum absorption peak in a range from 1713 to 1723 cm −1 assigned to carbonyl in the polyester resin in a FT-IR spectrum obtained by measuring the first group by an ATR method using Ge as an ATR crystal where an infrared light incidence angle is set to 45°, and
Bl is a ratio of an intensity of a maximum absorption peak in a range from 1130 to 1170 cm −1 assigned to a sulfonic acid group contained in the polyolefin resin with respect to an intensity of a maximum absorption peak in a range from 1713 to 1723 cm −1 assigned to carbonyl in the polyester resin in a FT-IR spectrum obtained by measuring the first group in accordance with an ATR method using diamond as an ATR crystal where an infrared light incidence angle is set to 45°; and
the toner has a span value of 1.1 to 2.0 defined as (D90−D10)/D50
when D90 is a particle diameter of the toner at which a cumulative number of particles in increasing order of particle diameter is 90%, D10 is a particle diameter of the toner at which a cumulative number of particles in increasing order of particle diameter is 10%, and a number-basis median diameter D50 of the toner is 3.0 to 6.0 um.
2. The toner according to claim 1 , wherein 1.50≤(As/Bs)/(Al/Bl)≤2.00.
3. The toner according to claim 1 , wherein the monomer unit having a sulfonic acid group is represented by Formula (C)
where R 1 represents a hydrogen atom or a methyl group, and X represents a linear or branched C1 to C8 alkylene group.
4. The toner according to claim 1 , wherein the polyester resin is amorphous.
5. The toner according to claim 1 , wherein a content ratio of polyolefin in the polyolefin resin is 5.0 to 20.0 mass %.