Claims
- 1. A positively chargeable toner for developing electrostatic images comprising binder, colorant, and particles of a positively chargeable compound selected from the group consisting of nitrogen-containing organic compounds having 14 or more carbon atoms and an aryl group, organic phosphino compounds having 14 or more carbon atoms and represented by the formula: ##STR8## wherein R.sup.1, R.sup.2 and R.sup.3 are independently aryl or alkaryl), organic metal complexes having 14 or more carbon atoms and at least one amino group as a ligand, and organic metal compounds having 18 or more carbon atoms and a directly connected aryl group, excepting for quaternary ammonium and pyridinium salts, wherein the positively chargeable compound is soluble in an organic solvent and has an oxidation potential of 750 mV or below, a whiteness W of 0.5 or above, and an average particle size of 5.0 microns or less, at least 50% by number of said particles being at most 1/5 of an average particle size of said toner.
- 2. The toner according to claim 1, wherein said positively chargeable compound has an oxidation potential of 700 mV or below.
- 3. The toner according to claim 1, which comprises 0.1 to 20 wt. parts of the positively chargeable compound contained in 100 wt. parts of the binder resin.
- 4. The toner according to claim 3, which comprises 0.5 to 10 wt. parts of the positively chargeable compound contained in 100 wt. parts of the binder resin.
- 5. The toner according to claim 1, wherein said positively chargeable compound is soluble in an organic solvent.
- 6. The toner according to claim 1, wherein said positively chargeable compound is soluble in an organic solvent in a concentration of 1 mmol/1-solvent or higher.
- 7. The toner according to claim 1, wherein said positively chargeable compound has a whiteness of 0.55 or above.
- 8. The toner according to claim 1, which has an average diameter of 5-20 microns.
- 9. An image forming method, comprising the steps of:
- forming a digital electrostatic latent image on a latent image-bearing member, and
- developing the digital latent image with a positively chargeable toner for developing electrostatic images, the toner comprising binder, colorant and, particles of a positively chargeable compound selected from the group consisting of nitrogen-containing organic compounds having 14 or more carbon atoms and an aryl group, organic phosphino compounds having 14 or more carbon atoms and represented the formula: ##STR9## (wherein R.sup.1, R.sup.2 and R.sup.3 are independently aryl or alkaryl), organic metal complexes having 14 or more carbon atoms and at least one amino group as a ligant, and organic metal compounds having 18 or more carbon atoms and a directly connected aryl group, excepting for quaternary ammonium and pyridinium salts, wherein the positively chargeable compound is soluble in an organic solvent and has an oxidation potential of 750 mV or below, a whiteness W of 0.5 or above, and an average particle size of 5.0 microns or less, at least 50% by number of said particles being at most 1/5 of an average particle size of said toner.
- 10. The method according to claim 9, wherein said latent image-bearing member comprising a photosensitive material layer and the electrostatic latent image is formed on the latent image-bearing member by irradiating a laser beam from a semiconductor laser onto the surface thereof.
- 11. The toner according to claim 1, wherein said colorant is a magnetic material.
- 12. The toner according to claim 11, wherein said magnetic material is contained in the toner in an amount of about 20 to 200 wt. parts per 100 wt. parts of resin component.
- 13. The toner according to claim 1, which is mixed with hydrophobic colloidal silicon treated with amino-silicone oil.
- 14. The method according to claim 9, wherein said colorant is a magnetic material.
- 15. The method according to claim 14, wherein said magnetic material is contained in the toner in an amount of about 20 to 200 wt. parts per 100 wt. parts of resin component.
- 16. The method according to claim 9, which is mixed with hydrophobic colloidal silica treated with amino-silicone oil.
Priority Claims (7)
Number |
Date |
Country |
Kind |
59-220987 |
Oct 1984 |
JPX |
|
59-220988 |
Oct 1984 |
JPX |
|
59-220989 |
Oct 1984 |
JPX |
|
59-222658 |
Oct 1984 |
JPX |
|
60-088875 |
Apr 1985 |
JPX |
|
60-101749 |
May 1985 |
JPX |
|
60-115773 |
May 1985 |
JPX |
|
Parent Case Info
This application is a continuation division, of application Ser. No. 391,666 filed Aug. 8, 1989, which is a continuation of application Ser. No. 073,848, filed July 14, 1987, which is a continuation of application Ser. No. 789,015 filed Oct. 18, 1985, all having been abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (7)
Number |
Date |
Country |
2606749 |
Sep 1976 |
DEX |
48-43158 |
Dec 1973 |
JPX |
57-79964 |
May 1982 |
JPX |
59-100455 |
Jun 1984 |
JPX |
59-177566 |
Oct 1984 |
JPX |
59-195661 |
Nov 1984 |
JPX |
1375814 |
Nov 1974 |
GBX |
Continuations (3)
|
Number |
Date |
Country |
Parent |
391666 |
Aug 1989 |
|
Parent |
73848 |
Jul 1987 |
|
Parent |
789015 |
Oct 1985 |
|