| 摘要 |
Provided is a toner having good endurance stability and good low-temperature fixability in high-speed printing, and having good resistance to the adhesion of printed paper. The toner is a magnetic toner having, on the surface of toner particle containing a binder resin and an ester compound as a releasing agent, inorganic fine particle “a” and organic-inorganic composite fine particle having a volumetric specific heat of from 2,900 kJ/(m3·° C.) to 4,200 kJ/(m3·° C.), in which a coverage A of the surface of the toner particle with the inorganic fine particle “a” is 45.0% or more and 70.0% or less. |
| 主权项 |
1. A magnetic toner, comprising:
a toner particle containing a binder resin, a magnetic material, and a releasing agent; and an inorganic fine particle “a” a and an organic-inorganic composite fine particle on each of surface of the toner particle, wherein: the organic-inorganic composite fine particle comprises
a vinyl-based resin particle andan inorganic fine particle “b” embedded in the vinyl-based resin particle, the organic-inorganic composite fine particle has a volumetric specific heat at 80° C. of 2,900 kJ/(m3·° C.) or more and 4,200 kJ/(m3·° C.) or less, and the toner contains the organic-inorganic composite fine particle of 0.5 mass % or more and 3.0 mass % or less with reference to a mass of the toner; the inorganic fine particle “a” contains at least an inorganic oxide fine particle selected from the group consisting of a silica fine particle, a titania fine particle, and an alumina fine particle, and has a number-average particle diameter (D1) of 5 nm or more and 25 nm or less; when a coverage of each of the surface of the toner particle with the inorganic fine particle “a” is represented by A (%), the coverage A is 45.0% or more and 70.0% or less; and the releasing agent comprises an ester compound. |
