Toner for developing electrostatic charge image
View Patent ↗A toner for developing an electrostatic charge image, comprising particles containing a binder resin and a colorant, characterized in that the particles contain a fixing aid having a melting point of from to 30 to 100° C. and a surface tension of at least 39 mN/m, and the fixing aid is present with an average particle diameter of at most 1 μm in the particles, which toner can realize low-temperature fixing with a wide fixing temperature range, is excellent in fixing strength, presents little soiling onto a photoreceptor and is free from soiling in the interior of the apparatus due to electrostatic deterioration, can realize low temperature-fixing even in the case of forming a full-color image and yet, is excellent in fixing strength, provides good surface smoothness during fixing and good transparency, and provides high mechanical durability even when used in non-magnetic one component development systems.
1. A toner for developing an electrostatic charge image, comprising particles containing a binder resin and a colorant, wherein the particles contain a fixing aid having a melting point of from 30 to 100° C. and a surface tension of at least 39 mN/m, the fixing aid is present with an average particle diameter of at most 1 μm internally in the particles, and when the fixing aid is a caprolactone derivative, it is a caprolactone diol or a caprolactone triol,
wherein the fixing aid has a crystallization peak with a half value width of at most 12° C.
2. The toner for developing an electrostatic charge image according to claim 1 , wherein the surface tension of the fixing aid is at least 42 mN/m.
3. The toner for developing an electrostatic charge image according to claim 1 , wherein the fixing aid has a fusion peak with a half value width of at most 10° C.
4. The toner for developing an electrostatic charge image according to claim 1 , wherein the fixing aid is a compound having a number average molecular weight of from 500 to 60,000 and hydroxyl groups.
5. The toner for developing an electrostatic charge image according to claim 1 , wherein the fixing aid is a polylactone.
6. The toner for developing an electrostatic charge image according to claim 1 , which is produced by a wet system polymerization method.
7. The toner for developing an electrostatic charge image according to claim 1 , which is produced by an emulsion polymerization flocculation method.
8. The toner for developing an electrostatic charge image according to claim 1 , which contains wax.
9. The toner for developing an electrostatic charge image according to claim 1 , which is obtained by a process of flocculating colorant particles and polymer primary particles containing the fixing aid to form agglomerates of particles.
10. The toner for developing an electrostatic charge image according to claim 8 , which is obtained by a process of flocculating colorant particles and polymer primary particles containing the fixing aid and wax to form agglomerates of particles.
11. The toner for developing an electrostatic charge image according to claim 8 , which is obtained by a process of flocculating polymer primary particles containing the fixing aid, colorant particles and fine particles of wax to form agglomerates of particles.
12. A method comprising developing an electrostatic charge image formed by full color with the toner according to claim 1 .
13. A method comprising developing an electrostatic charge image in a contact developing system with the toner according to claim 1 .
14. A method comprising fixing an image using a toner for developing an electrostatic charge image as a developer, wherein the toner comprises particles containing a binder resin and a colorant, wherein the particles contain a fixing aid having a melting point of from 30 to 100° C. and a surface tension of at least 39 mN/m, the fixing aid is present with an average particle diameter of at most 1 μm internally in the particles, and when the fixing aid is a caprolactone derivative, it is a caprolactone diol or a caprolactone triol, wherein the fixing aid has a crystallization peak with a half value width of at most 12° C.
15. The toner for developing an electrostatic charge image according to claim 7 , wherein a polymerizable monomer and the fixing aid are mixed; the fixing aid is finely dispersed in the monomer, and then the monomer is emulsion-polymerized to obtain a dispersion containing primary particles of the polymer.
16. The toner for developing an electrostatic charge image according to claim 7 , wherein a dispersion obtained by dispersing the fixing aid in a medium is used as seeds, and a polymerizable monomer is dropwise added thereto to carry out emulsion polymerization to obtain primary particles of the polymer internally containing the fixing aid.
17. A toner for developing an electrostatic charge image, comprising particles containing a binder resin and a colorant, wherein the particles contain a fixing aid having a melting point of from 30 to 100° C. and a surface tension of at least 39 mN/m, the fixing aid and the binder being different components, the fixing aid is present with an average particle diameter of at most 1 μm internally in the particles, and when the fixing aid is a caprolactone derivative, it is a caprolactone diol or a caprolactone triol.
18. A toner for developing an electrostatic charge image, comprising particles containing a binder resin and a colorant, wherein the particles contain a fixing aid having a melting point of from 30 to 70° C. and a surface tension of at least 39 mN/m, the fixing aid is present with an average particle diameter of at most 1 μm internally in the particles, and when the fixing aid is a caprolactone derivative, it is a caprolactone diol or a caprolactone triol.
19. A toner for developing an electrostatic charge image, comprising particles containing a binder resin and a colorant, wherein the particles contain a fixing aid having a melting point of from 30 to 100° C. and a surface tension of at least 42 mN/in, the fixing aid is present with an average particle diameter of at most 1 μm internally in the particles, and when the fixing aid is a caprolactone derivative, it is a caprolactone diol or a caprolactone triol.