Claims
- 1. A toner for developing electrostatic images, comprising a colorant and a binder resin, said toner containing a reactive polymer which cross-links when heated to a temperature that is higher than a maximum temperature during preparation of the toner.
- 2. A toner for developing electrostatic images according to claim 1, wherein the toner is prepared at least via an aggregating step of aggregating particles containing at least particles of the binder resin in a dispersion with the particles dispersed therein, to obtain an aggregation of the particles, and a coalescing step of coalescing the aggregation of the particles by heating.
- 3. A toner for developing electrostatic images according to claim 1, wherein the reactive polymer contains one or more kinds of cyclic reactive groups which cross-link at a temperature that is higher than a maximum temperature during preparation of the toner.
- 4. A toner for developing electrostatic images according to claim 3, wherein the cyclic reactive group is any one of an epoxy group, an aziridinyl group and an oxazoline group.
- 5. A toner for developing electrostatic images according to claim 3, wherein the reactive polymer is a vinyl type resin containing one or more kinds of cyclic reactive groups.
- 6. A toner for developing electrostatic images according to claim 1, wherein the binder resin is the reactive polymer.
- 7. A toner for developing electrostatic images according to claim 3, the toner containing a compound having a carboxyl group.
- 8. A toner for developing electrostatic images according to claim 7, wherein the carboxyl group is a dicarboxylic acid.
- 9. A toner for developing electrostatic images according to claim 7, wherein the compound having a carboxyl group is a carboxyl group-containing latex.
- 10. A toner for developing electrostatic images according to claim 1, having a shape factor SF1 represented by the following formula (1) of 140 or less:
- 11. A toner for developing electrostatic images according to claim 1, having a surface index value represented by the following formula (2) of 2.0 or less:
- 12. A toner for developing electrostatic images according to claim 1, wherein a glass transition temperature of the binder resin is in a range of 45° C. to 75° C.
- 13. A toner for developing electrostatic images according to claim 1, wherein the toner has a layered-structure containing at least a shell layer provided so as to cover the surface thereof, and a core layer provided on an inner side of the shell layer.
- 14. A toner for developing electrostatic images according to claim 13, wherein the reactive polymer is contained at least in the core layer.
- 15. A toner for developing electrostatic images according to claim 13, wherein the binder resin is contained in the core layer and the shell layer, and a glass transition temperature of a binder resin contained in the core layer is lower than a glass transition temperature of a binder resin contained in the shell layer.
- 16. A toner for developing electrostatic images according to claim 13, wherein a glass transition temperature of a binder resin contained in the core layer is in a range of 50° C. to 75° C.
- 17. A process for preparing a toner for developing electrostatic images comprising at least an aggregating step of aggregating particles containing at least particles of a binder resin in a dispersion with the particles dispersed therein to obtain an aggregation of the particles, and a coalescing step of coalescing the aggregation of the particles by heating, said toner comprising a colorant, a binder resin, and a reactive polymer which cross-links when heated to a temperature that is higher than a maximum temperature during preparation of the toner.
- 18. A process for preparing a toner for developing electrostatic images according to claim 17, wherein the toner has a layered-structure containing at least a shell layer provided so as to cover the surface thereof, and a core layer provided on an inner side of the shell layer, and the aggregating step comprises a step of forming an aggregated particle which is to be the core layer, and a step of forming an aggregated particle on which a layer which is to be the shell layer is provided by adhering the particles to the surface of the aggregated particle which is to be the core layer.
- 19. A developer for developing electrostatic images, comprising a carrier and a toner for developing electrostatic images, said toner comprising a colorant, a binder resin, and a reactive polymer which cross-links when heated to a temperature that is higher than a maximum temperature during preparation of the toner.
- 20. An image forming method comprising at least the steps of forming an electrostatic latent image on an electrostatic image carrier, developing the electrostatic latent image using a developer to form a toner image, transferring the toner image on a transfer body, and thermally fixing the toner image, wherein
a developer for developing electrostatic images is used as the developer, the developer for developing electrostatic images comprising a carrier and a toner for developing electrostatic images, said toner comprising a colorant, a binder resin, and a reactive polymer which cross-links when heated to a temperature that is higher than a maximum temperature during preparation of the toner.
Priority Claims (2)
Number |
Date |
Country |
Kind |
2002-273483 |
Sep 2002 |
JP |
|
2003-63162 |
Mar 2003 |
JP |
|
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority under 35 USC 119 from Japanese patent Application Nos. 2002-273483 and 2003-63162, the disclosure of which is incorporated by reference herein.