Claims
- 1. A magnetic toner comprising magnetic toner particles containing at least a binder resin and magnetic iron oxide particles, wherein the distribution of Fe (II) in a surface layer of said magnetic iron oxide particles satisfy the following conditions (a)-(c):
- (a) a dissolved Fe (II) content in dissolved total iron of 14-33.3 wt. % at a dissolved total iron percentage in the range of 4-6 wt. %;
- (b) a dissolved Fe (II) content in dissolved total iron of 17-33.3 wt. % at a dissolved total iron percentage in the range of 9-11 wt. %; and
- (c) a dissolved Fe (II) content in dissolved total iron of 18-33 wt. % at a dissolved total iron percentage in the range of 14-16 wt. % and said magnetic iron oxide particles have an FeO content based on total Fe of 30-40 wt. %.
- 2. The magnetic toner according to claim 1, wherein said magnetic iron oxide particles satisfy the following conditions (d)-(e):
- (d) a dissolved Fe (II) content in dissolved total iron of 14-30 wt. % at a dissolved total iron percentage in the range of 4-6 wt. %,
- (e) a dissolved Fe (II) content in dissolved total iron of 17-32 wt. % at a dissolved total iron percentage in the range of 9-11 wt. %,
- (f) a dissolved Fe (II) content in dissolved total iron of 19-33 wt. % at a dissolved total iron percentage in the range of 14-16 wt. %.
- 3. The magnetic toner according to claim 2, wherein said magnetic iron oxide particles have an apparent bulk density of 0.1-1.2 g/cc.
- 4. The magnetic toner according to claim 2, wherein said magnetic iron oxide particles have an average particle size which is larger than 0.05 micron and smaller than 0.35 micron.
- 5. The magnetic toner according to claim 2, wherein said magnetic iron oxide particles have an average particle size which is larger than 0.10 micron and smaller than 0.28 micron.
- 6. The magnetic toner according to claim 2, wherein said binder resin comprises a styrene-type copolymer.
- 7. The magnetic toner according to claim 6, wherein said binder resin comprises a styrene-n-butyl acrylate-divinylbenzene copolymer.
- 8. The magnetic toner according to claim 2, wherein said magnetic toner particles contain 40-150 wt. parts of the magnetic iron oxide particles per 100 wt. parts of the binder resin.
- 9. The magnetic toner according to claim 2, wherein said magnetic toner particles contain 50-120 wt. parts of the magnetic iron oxide particles per 100 wt. parts of the binder resin.
- 10. The magnetic toner according to claim 2, wherein said binder resin contains a crosslinking agent.
- 11. The magnetic toner according to claim 2, wherein said magnetic toner particles contain a charge control agent.
- 12. The magnetic toner according to claim 2, wherein said magnetic toner particles contain a waxy substance in a proportion of 0.5-6 wt. % based on the binder resin.
- 13. The magnetic toner according to claim 2, which further comprises hydrophobic silica fine powder.
- 14. The magnetic toner according to claim 13, which contains 0.1-5 wt. parts of the hydrophobic silica fine powder per 100 wt. parts of the magnetic toner particles.
- 15. The magnetic toner according to claim 1, wherein said magnetic iron oxide particles having a dissolved Fe (II) content in total iron y (wt. %) satisfying the following conditions (g) and (h) at a dissolved total iron percentage x (wt. %) satisfying 0<x.ltoreq.33.3;
- (g) y.ltoreq.33.3, and
- (h) y.gtoreq.0.26x+16.0.
- 16. The magnetic toner according to claim 15, wherein said magnetic iron oxide particles have an apparent bulk density of 0.1-1.2 g/cc.
- 17. The magnetic toner according to claim 15, wherein said magnetic iron oxide particles have an average particle size which is larger than 0.05 micron and smaller than 0.35 micron.
- 18. The magnetic toner according to claim 15, wherein said magnetic iron oxide particles have an average particle size which is larger than 0.10 micron and smaller than 0.28 micron.
- 19. The magnetic toner according to claim 15, wherein said binder resin comprises a styrene-type copolymer.
- 20. The magnetic toner according to claim 19, wherein said binder resin comprises a styrene-n-butyl acrylate-divinylbenzene copolymer.
- 21. The magnetic toner according to claim 15, wherein said magnetic toner particles contain 40-150 wt. parts of the magnetic iron oxide particles per 100 wt. parts of the binder resin.
- 22. The magnetic toner according to claim 15, wherein said magnetic toner particles contain 50-120 wt. parts of the magnetic iron oxide particles per 100 wt. parts of the binder resin.
- 23. The magnetic toner according to claim 15, wherein said binder resin contains a crosslinking agent.
- 24. The magnetic toner according to claim 15, wherein said magnetic toner particles contain a charge control agent.
- 25. The magnetic toner according to claim 15, wherein said magnetic toner particles contain a waxy substance in a proportion of 0.5-6 wt. % based on the binder resin.
- 26. The magnetic toner according to claim 15, which further comprises hydrophobic silica fine powder.
- 27. The magnetic toner according to claim 26, which contains 0.01-8 wt. parts of the hydrophobic silica fine powder per 100 wt. parts of the magnetic toner particles.
- 28. The magnetic toner according to claim 1, wherein said magnetic iron oxide particles have a dissolved Fe (II) content in total iron y (wt. %) satisfying the following conditions (g) and (h) at a dissolved total iron percentage x (wt. %) satisfying 4.ltoreq.x.ltoreq.16:
- (g) y.ltoreq.33.3, and
- (h) y.gtoreq.0.26x+16.0.
- 29. The magnetic toner according to claim 28, wherein said magnetic iron oxide particles have an apparent bulk density of 0.1-1.2 g/cc.
- 30. The magnetic toner according to claim 28, wherein said magnetic iron oxide particles have an average particle size which is larger than 0.05 micron and smaller than 0.35 micron.
- 31. The magnetic toner according to claim 28, wherein said magnetic iron oxide particles have an average particle size which is larger than 0.10 micron and smaller than 0.28 micron.
- 32. The magnetic toner according to claim 28, wherein said binder resin comprises a styrene-type copolymer.
- 33. The magnetic toner according to claim 32, wherein said binder resin comprises a styrene-n-butyl acrylate-divinylbenzene copolymer.
- 34. The magnetic toner according to claim 28, wherein said magnetic toner particles contain 40-150 wt. parts of the magnetic iron oxide particles per 100 wt. parts of the binder resin.
- 35. The magnetic toner according to claim 28, wherein said magnetic toner particles contain 50-120 wt. parts of the magnetic iron oxide particles per 100 wt. parts of the binder resin.
- 36. The magnetic toner according to claim 28, wherein said binder resin comprises a crosslinking agent.
- 37. The magnetic toner according to claim 28, wherein said magnetic toner particles contain a charge control agent.
- 38. The magnetic toner according to claim 28, wherein said magnetic toner particles contain a waxy substance in a proportion of 0.5-6 wt. % based on the binder resin.
- 39. The magnetic toner according to claim 28, which further comprises hydrophobic silica fine powder.
- 40. The magnetic toner according to claim 39, which contains 0.01-8 wt. parts of the hydrophobic silica fine powder per 100 wt. parts of the magnetic toner particles.
- 41. The magnetic toner according to claim 1, wherein said magnetic iron oxide particles have an apparent bulk density of 0.1-1.2 g/cc.
- 42. The magnetic toner according to claim 1, wherein said magnetic iron oxide particles have an average particle size which is larger than 0.05 micron and smaller than 0.35 micron.
- 43. The magnetic toner according to claim 1, wherein said magnetic iron oxide particles have an average particle size which is larger than 0.10 micron and smaller than 0.28 micron.
- 44. The magnetic toner according to claim 1, wherein said binder resin comprises a styrene-type copolymer.
- 45. The magnetic toner according to claim 44, wherein said binder resin comprises a styrene-n-butyl acrylate-divinylbenzene copolymer.
- 46. The magnetic toner according to claim 1, wherein said magnetic toner particles contain 40-150 wt. parts of the magnetic iron oxide particles per 100 wt. parts of the binder resin.
- 47. The magnetic toner according to claim 1, wherein said magnetic toner particles contain 50-120 wt. parts of the magnetic iron oxide particles per 100 wt. parts of the binder resin.
- 48. The magnetic toner according to claim 1, wherein said binder resin contains a crosslinking agent.
- 49. The magnetic toner according to claim 1, wherein said magnetic toner particles contain a charge control agent.
- 50. The magnetic toner according to claim 1, wherein said magnetic toner particles contain a waxy substance in a proportion of 0.5-6 wt. % based on the binder resin.
- 51. The magnetic toner according to claim 1, which further comprises hydrophobic silica fine powder.
- 52. The magnetic toner according to claim 51, which contains 0.1-5 wt. parts of the hydrophobic silica fine powder per 100 wt. parts of the magnetic toner particles.
Priority Claims (2)
Number |
Date |
Country |
Kind |
2-078999 |
Mar 1990 |
JPX |
|
3-070480 |
Mar 1991 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/675,337 filed Mar. 26, 1991, now abandoned.
US Referenced Citations (9)
Foreign Referenced Citations (2)
Number |
Date |
Country |
53-035697 |
Apr 1978 |
JPX |
58-002226 |
Jan 1983 |
JPX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
675337 |
Mar 1991 |
|