Toner and method for manufacturing the same

1. A toner comprising:

toner particles each of which contains a binding resin having an ester bond, a colorant, and polysiloxane,

wherein

the polysiloxane is dimethylpolysiloxane,

the toner particles contain the polysiloxane in a content of 1 mass % or more and 15 mass % or less based on a total mass of the toner particles,

each of the toner particles has a domain in which the polysiloxane is contained, wherein in a cross section of each of the toner particles, the domain has a major axis of 10 nm or more and 500 nm or less,

wherein

when

in an FT-IR spectrum of the toner particles measured and obtained by an ATR method under conditions where Ge is used as an ATR crystal and an infrared light incidence angle is 45°,

a maximum absorption peak intensity in a range of 990 cm −1 or more and 1040 cm −1 or less derived from Si—O of the polysiloxane is defined as Pa (Ge),

a maximum absorption peak intensity in a range of 1500 cm −1 or more and 1800 cm +1 or less derived from C(═O) of an ester group of the binding resin is defined as Pb (Ge), and

a value of Pa (Ge)/Pb (Ge) is defined as a siloxane index (Ge); and

in an FT-IR spectrum of the toner particles measured and obtained by an ATR method under condition where diamond is used as an ATR crystal and an infrared light incidence angle is 45°,

a maximum absorption peak intensity in a range of 990 cm −1 or more and 1040 cm −1 or less derived from the Si—O of the siloxane is defined as Pa (D),

a maximum absorption peak intensity in a range of 1500 cm +1 or more and 1800 cm −1 or less derived from the C(═O) of the ester group of the binding resin is defined as Pb (D), and

a value of Pa(D)/Pb(D is defined as a siloxane index (D),

a ratio of the siloxane index (Ge) to the siloxane index (D), i.e. Siloxane index (Ge)/Siloxane index (D), is 1.0 or less.

2. The tone according to claim 1 , wherein

each of the toner particles further contain wax, and the wax is aliphatic hydrocarbon.

3. The tone according to claim 1 , wherein

the binding resin is amorphous polyester.

4. The toner according to claim 1 , wherein

each of the toner particles further contain a crystalline polyester.

5. The toner according to claim 1 , wherein

when the content of the polysiloxane in the toner particles is defined as X, and the ratio of the siloxane Lox (Ge) to the siloxane index (D) is defined as Y, product (X×Y) is 1.0 or more and 5.0 or less.

6. The toner according to claim 1 , wherein

an average circularity of the toner particles is 0.90 or more and 0.97 or less.

7. The toner according to claim 1 , wherein

the toner particles have fine concavities and convexities of 100 nm or more and 500 nm or less on a surface of the toner particles.

8. A method for manufacturing a toner comprising:

emulsifying polysiloxane in an aqueous medium to obtain a emulsion liquid of emulsified particles of the polysiloxane;

dispersing a binding resin in an aqueous medium to obtain a dispersion liquid of resin fine particles;

mixing the emulsion liquid of the emulsified particles of the polysiloxane and the dispersion liquid of the resin fine particles; and

aggregating the emulsified particles of the polysiloxane and the resin fine particles to obtain toner particles, wherein

the toner particles contain a resin having an ester bond, a colorant, and polysiloxane,

the polysiloxane is dimethylpolysiloxane,

a content of the polysiloxane in the toner particles is 1 mass % or more and 15 mass % or less based on a total mass of the toner particles,

a ratio (Siloxane index (Ge)/Siloxane index (D)) of a siloxane index (Ge) to a siloxane index (D) in the toner particles is 1.0 or less,

the toner particles have a domain of the polysiloxane,

a major axis of the domain of the polysiloxane in a cross section of the toner particles is 10 nm or more and 500 nm or less, and

the siloxane index (GE) is a value of Pa (Ge)/Pb (Ge) when a maximum absorption peak intensity in range of 990 cm −1 or more and 1040 cm 1 or less derived from Si—O of the polysiloxane is defined as Pa (Ge) and a maximum absorption peak intensity in range of 1500 cm −1 or more and 1800 cm −1 or less derived from C(═O) of an ester group of a binding resin is defined as Pb (Ge) in an FT-IR spectrum measured and obtained by an ATR method under conditions where Ge is used as an ATR crystal and an infrared light incidence angle is 45° and the siloxane index (D) is Pa (D)/Pb(D) when a diamond is used as the ATR crystal, a maximum absorption peak intensity in a range of 990 cm −1 or more and 1040 cm −1 or less derived from the Si—O of the siloxane is defined as Pa (D), and a maximum absorption peak intensity in a range of 1500 cm −1 or more and 1800 cm −1 or less derived from the C(═O) of the ester group of the binding resin is defined as Pb (D).

9. The method for manufacturing a toner according to claim 8 , wherein

a median size on a volume basis of the emulsified particles of the polysiloxane is 0.05 μm or more 10.5 μm or less.