Toner
AssigneeCanon Kabushiki Kaisha
InventorsHisasuke Kajihara, Maki Imura, Kentaro Kamae, Yuu Nishimura, Takaho Shibata
Life of this patent
Estimating the term…
Abstract
The toner comprises a toner particle that contains a binder resin, a polymer C, and a pigment, wherein at least a portion of the polymer C is bonded with at least a portion of the pigment; in solid-state NMR measurement at 60° C. using as a sample, a solid fraction collected according to a prescribed procedure in which the toner is dissolved in chloroform, transverse relaxation time T2 of a peak observed at 1.5 ppm to 2.5 ppm is 1.0 ms to 50.0 ms; and using a SPA (J/cm3)0.5 for a SP value of the binder resin and a SPB (J/cm3)0.5 for a SP value of the polymer C, the SPA and the SPB satisfy a following formula (1). 1.0≤SPA−SPB≤2.4 (1)
Claims7
A toner, comprising:
- a toner particle comprising a binder resin, a polymer C and a pigment;
- the binder resin being an amorphous polyester resin;
- polymer C being a crystalline polyester resin;
- the pigment comprising a quinacridone pigment;
- at least a portion of polymer C is bonded with at least a portion of the pigment;
- the toner has a peak corresponding to the pigment at 2 θ=27°±0.5° in x-ray diffraction measurement of the toner where θ is Bragg angle and 2θ is diffraction angle, and a crystallite diameter D for a crystal corresponding to the peak at 2 θ=27°±0.5° is 12 to 20 nm;
- and
- 300.0≤Mw/D <2000.0 when Mw is a weight-average molecular weight of polymer C, wherein
- in solid-state NMR measurement at 60° C. using a solid fraction collected according to Procedure for a sample, transverse relaxation time T2 of a peak observed at 1.5 to 2.5 ppm is 1.0 to 50.0 ms, and
- 1.0<SPA+SPB ≤2.4 when SPA(J/cm3)0.5 is a SP value of the binder resin and SPB(J/cm3)0.5 is a SP value of polymer C,
- Procedure
- a sucrose concentrate is prepared by adding 160 g of sucrose to 100 mL of deionized water and dissolving while heating on a water bath and a dispersion is prepared by introducing 31 g of the sucrose concentrate and 6 mL of a 10 mass % aqueous solution of a neutral pH 7 detergent comprising a nonionic surfactant, anionic surfactant and organic builder into a centrifugal separation tube, adding 2.0 g of the toner to the dispersion, and breaking up any clumps of the toner with a spatula and shaking the centrifugal separation tube with a shaker followed by separating a sediment from the solution using a centrifugal separator under conditions of 3500 rpm, 30 minutes and a rotation radius of 3 cm, filtering a floating solid fraction with a vacuum filter and drying to obtain a solid fraction, dissolving 1 g of the solid fraction in 20 mL chloroform and performing centrifugal separation for 180 minutes at 15000 rpm and a rotation radius of 3 cm, discarding a supernatant, twice adding another 20 mL chloroform, performing said centrifugal separation and separating a sediment, filtering the sediment on a vacuum filter and drying an obtained solid fraction for at least 5 hours to obtain the sample.
Dependencies are inferred from the claim text.