Toner and two-component developer
There are provided a toner and a two-component developer effective to make exudation of a release agent easy during fixing and to prevent occurrence of high-temperature offset, in which both the preservation stability and the fixing property are improved at the same time. The capsule toner comprises a toner base particle and a resin layer formed of fine resin particles with which a surface of the toner base particle is coated. In the capsule toner, both of the following expressions are satisfied: A<B ; and ( B−A )<3×10 3 Pa where A is a storage elastic modulus of the toner base particle at a softening temperature of the toner base particle, and B is a storage elastic modulus of fine resin particle at the softening temperature of the toner base particle.
1. A capsule toner comprising a toner base particle and a resin layer formed of fine resin particles with which a surface of the toner base particle is coated, both of the following expressions being satisfied:
A<B ; and ( B−A )<3×10 3 Pa (1)
where A is a storage elastic modulus of the toner base particle at a softening temperature of the toner base particle, B is a storage elastic modulus of the fine resin particle at the softening temperature of the toner base particle, and both A and B are 1.0×10 2 Pa or more and less than 5.0×10 4 Pa.
2. The capsule toner of claim 1 , wherein the storage elastic modulus A and the storage elastic modulus B satisfy both of the following expressions:
A<B ; and ( B−A )<1×10 3 Pa (2).
3. The capsule toner of claim 1 , wherein the capsule toner is manufactured by a method comprising a fine resin particle adhering step of adhering the fine resin particles to the surface of the toner base particle which has been produced through a pulverization method, a spraying step of spraying a liquid with carrier gas from a spraying section to the toner base particle and the fine resin particles in a fluidized state to plasticize these particles, and a film-forming step of continuing rotating by a rotary stirring section to fluidize the toner base particle and the fine resin particles until the fine resin particles adhered to the toner base particle are softened to form a film.
4. The capsule toner of claim 3 , wherein an addition amount of the fine resin particle at the fine resin particle adhering step is 5 parts by weight or more based on 100 parts by weight of the toner base particle.
5. The capsule toner of claim 1 , wherein a glass transition temperature of the fine resin particle is 60° C. or higher.
6. A two-component developer comprising the capsule toner of claim 1 and a carrier.