Toner
AssigneeCanon Kabushiki Kaisha
InventorsHISASUKE KAJIHARA, MAKI IMURA, KENTARO KAMAE, YUU NISHIMURA, TAKAHO SHIBATA
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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)
Claims11
A toner comprising a toner particle comprising 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 a solid fraction collected according to a following (Procedure 1) for a sample, 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)
- (Procedure 1)
- 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. A dispersion is prepared by introducing a following into a centrifugal separation tube:
- 31 g of the sucrose concentrate and 6 mL of a 10 mass % aqueous solution of a neutral pH 7 detergent for cleaning precision measurement instrumentation, comprising a nonionic surfactant, anionic surfactant, and organic builder. 2.0 g of the toner is added to the dispersion, and clumps of the toner are broken up using a spatula. The centrifugal separation tube is then shaken with a shaker. After shaking, a sediment is separated from the solution using a centrifugal separator and conditions of 3500 rpm, 30 minutes, and a rotation radius of 3 cm. A floating solid fraction is filtered with a vacuum filter and is then dried for at least 1 hour with a dryer to obtain a solid fraction. 1 g of the obtained solid fraction is dissolved in 20 mL chloroform;
- centrifugal separation is carried out for 180 minutes at 15000 rpm and a rotation radius of 3 cm;
- and a supernatant is discarded. Another 20 mL chloroform is added and the same process is repeated twice and a sediment is separated. The obtained sediment is filtered on the vacuum filter and a obtained solid fraction is dried for at least 5 hours in the dryer to obtain the sample.
Dependencies are inferred from the claim text.