Electrophotographic toner and manufacturing method thereof, polyester resin for electrophotographic toner and manufacturing method thereof, electrophotographic developer and image forming method
View Patent ↗The present invention provides a binder resin that is used for an electrophotographic toner, an electrophotographic toner using the same, and a manufacturing method thereof, as well as an electrophotographic developer and an image forming method. The binder resin includes a rare earth element in a range of about 1 to 10000 ppm and is preferably made of a polyester resin. The polyester resin is preferably synthesized from from an acid unit having a dicarboxylic acid group and an alcohol unit having a diol group by use of a non-homogeneous catalyst in which a rare earth metal triflate or a rare earth metal triflylimide is carried on a carrier.
1. An electrophotographic toner comprising a binder resin and a coloring agent, wherein the binder resin is a polyester resin comprising a rare earth element in a range of about 1 to 10000 ppm.
2. The electrophotographic toner of claim 1 , wherein the rare earth element is selected from the group consisting of Sc, Y, Yb and Sm.
3. The electrophotographic toner of claim 1 , wherein the binder resin is synthesized with a non-homogeneous catalyst in which a rare earth metal triflate or a rare earth metal triflylimide is carried on a carrier.
4. The electrophotographic toner of claim 3 , wherein the rare earth element is selected from the group consisting of Sc, Y, Yb and Sm.
5. The electrophotographic toner of claim 3 , wherein the binder resin is synthesized from an acid unit having a dicarboxylic acid group and an alcohol unit having a diol group.
6. The electrophotographic toner of claim 5 , wherein the rare earth element is selected from the group consisting of Sc, Y, Yb and Sm.
7. The electrophotographic toner of claim 5 , wherein the polyester resin is crystalline.
8. The electrophotographic toner of claim 7 , wherein the rare earth element is selected from the group consisting of Sc, Y, Yb and Sm.
9. The electrophotographic toner of claim 1 , wherein the polyester resin is synthesized by use of a catalyst represented by the following Formula (1) or (2):
X(OSO 2 CF 3 ) 3 Formula (1)
X(N(SO 2 CF 3 ) 2 ) 3 Formula (2)
wherein X represents Sc, Y, Yb or Sm.
10. The electrophotographic toner of claim 9 , wherein the polyester resin is synthesized from acid units having dicarboxylic acid groups and alcohol units having diol groups.
11. The electrophotographic toner of claim 9 , wherein the polyester resin is crystalline.
12. A method for manufacturing an electrophotographic toner comprising:
blending a particle dispersion solution of a binder resin and a particle dispersion solution of a coloring agent to aggregate particles of the binder resin and particles of the coloring agent; and
heating the aggregated particles to a temperature equal to or greater than a glass transition temperature or a melting point of the binder resin to fuse aggregated particles,
wherein the binder resin is a polyester resin for use in an electrophotographic toner, the binder resin comprising a rare earth element in a range of about 1 to 10000 ppm, wherein the polyester resin is synthesized with a non-homogeneous catalyst in which a rare earth metal triflate or a rare earth metal triflylimide is carried on a carrier.
13. The method for manufacturing an electrophotographic toner of claim 12 , wherein the rare earth element is selected from the group consisting of Sc, Y, Yb and Sm.
14. The method for manufacturing an electrophotographic toner of claim 12 , wherein the polyester resin is synthesized from acid units having dicarboxylic acid groups and alcohol units having diol groups.
15. An image forming method comprising:
forming an electrostatic latent image on a surface of a latent image holder;
developing, by use of a developer carried on a developer carrier, the electrostatic latent image formed on the surface of a latent image holder to form a toner image;
transferring the toner image formed on the surface of the latent image holder onto a surface of a transfer receiving material; and
thermally fixing the transferred toner image on the surface of the material, wherein
the developer comprises a carrier and an electrophotographic toner;
the electrophotographic toner comprises a binder resin and a coloring agent; and
the binder resin is a polyester resin for use in an electrophotographic toner, the binder resin comprising a rare earth element in a range of about 1 to 10000 ppm, wherein the polyester resin is synthesized with a non-homogeneous catalyst in which a rare earth metal triflate or a rare earth metal triflylimide is carried on a carrier.
16. The image forming method of claim 15 , wherein the rare earth element is selected from the group consisting of Sc, Y, Yb and Sm.
17. The image forming method of claim 15 , wherein the polyester resin is synthesized from an acid unit having a dicarboxylic acid group and an alcohol unit having a diol group.