Claims
- 1. A toner for developing electrostatic images comprising toner particles and a fluidity improver;
- said toner particles having a number average particle diameter from 0.5 .mu.m to 5.0 .mu.m and containing toner particles with a particle diameter of 6.0 .mu.m or larger in a proportion of not more than 3% by number and toner particles with a particle diameter of 0.3 .mu.m or smaller in a proportion of not more than 10% by number, and
- said fluidity improver comprising a fine powder (i) having a specific surface area of not less than 300 m.sup.2 /g as measured by the BET method using nitrogen adsorption and (ii) selected from the group consisting of fine silica powder, fine titanium oxide powder and fine aluminum oxide powder.
- 2. The toner according to claim 1, wherein said toner particles are obtained by a process comprising the steps of:
- dispersing or dissolving a monomer composition containing at least a colorant, a charge control agent, or a mixture of these, and a polymerizable monomer, in free space formed in a polymeric medium, said polymeric medium comprising a polymer dissolved in a solvent;
- polymerizing the dispersed or dissolved monomer composition to obtain toner particles; and
- removing said toner particles from the polymeric medium.
- 3. The toner according to claim 2, wherein said solvent comprises a lower alcohol.
- 4. The toner according to claim 2, wherein said polymer has a weight average molecular weight from 3,000 to 150,000.
- 5. The toner according to claim 2, wherein said polymer has a weight average molecular weight from 8,000 to 80,000.
- 6. The toner according to claim 2, wherein said solvent comprises a member selected from the group consisting of a straight-chain or branched aliphatic alcohol, an aliphatic hydrocarbon, an aromatic hydrocarbon, a halogenated hydrocarbon, an ether, a fatty acid, an ester and a sulfur-containing compound.
- 7. The toner according to claim 1, wherein said toner particles have a number average particle diameter of from 0.5 .mu.m to 4.0 .mu.m.
- 8. The toner according to claim 1, wherein said toner particles contain toner particles with a particle diameter of 6.0 .mu.m or larger in a proportion of not more than 1% by number.
- 9. The toner according to claim 1, wherein said toner particles comprises a resin component having a number average molecular weight of from 3,000 to 1,000,000.
- 10. The toner according to claim 1, wherein the fluidity improver has been subjected to disintegration treatment.
- 11. The toner according to claim 1, wherein the fluidity improver has a specific surface area of not less than 350 m.sup.2 /g.
- 12. A one-component developer comprising a toner having toner particles and a fluidity improver;
- said toner particles having a number average particle diameter from 0.5 .mu.m to 5.0 .mu.m and containing toner particles with a particle diameter of 6.0 .mu.m or larger in a proportion of not more than 3% by number and toner particles with a particle diameter of 0.3 .mu.m or smaller in a proportion of not more than 10% by number, and
- said fluidity improver comprising a fine powder (i) having a specific surface area of not less than 300 m.sup.2 /g as measured by the BET method using nitrogen adsorption and (ii) selected from the group consisting of fine silica powder, fine titanium oxide powder and fine aluminum oxide powder.
- 13. The one-component developer according to claim 12, wherein said toner particles are obtained by a process comprising the steps of:
- dispersing or dissolving a monomer composition containing at least a colorant, a charge control agent, or a mixture of these, and a polymerizable monomer, in free space formed in a polymeric medium, said polymeric medium comprising a polymer dissolved in a solvent;
- polymerizing the dispersed or dissolved monomer composition to obtain toner particles; and
- removing said toner particles from the polymeric medium.
- 14. The one-component developer according to claim 13, wherein said polymer has a weight average molecular weight from 3,000 to 150,000.
- 15. The one-component developer according to claim 13, wherein said polymer has a weight average molecular weight from 8,000 to 80,000.
- 16. The one-component developer according to claim 13, wherein said solvent comprises a member selected from the group consisting of a straight-chain or branched aliphatic alcohol, an aliphatic hydrocarbon, an aromatic hydrocarbon, a halogenated hydrocarbon, an ether, a fatty acid, an ester and a sulfur-containing compound.
- 17. The one-component developer according to claim 13, wherein said solvent comprises a lower alcohol.
- 18. The one-component developer according to claim 12, wherein said toner particles have a number average particle diameter of from 0.5 .mu.m to 4.0 .mu.m.
- 19. The one-component developer according to claim 12, wherein said toner particles contain toner particles with a particle diameter of 6.0 .mu.m or larger in a proportion of not more than 1% by number.
- 20. The one-component developer according to claim 12, wherein said toner particles comprises a resin component having a number average molecular weight of from 3,000 to 1,000,000.
- 21. The one-component developer according to claim 12, wherein the fluidity improver has been subjected to disintegration treatment.
- 22. The one-component developer according to claim 12, wherein the fluidity improver has a specific surface area of not less than 350 m.sup.2 /g.
- 23. A two-component developer comprising (a) a toner having toner particles and a fluidity improver, and (b) a carrier;
- said toner particles having a number average particle diameter from 0.5 .mu.m to 5.0 .mu.m and containing toner particles with a particle diameter of 6.0 .mu.m or larger in a proportion of not more than 3% by number and toner particles with a particle diameter of 0.3 .mu.m or smaller in a proportion of not more than 10% by number,
- said fluidity improver comprising a fine powder (i) having a specific surface area of not less than 300 m.sup.2 /g as measured by the BET method using nitrogen adsorption and (ii) selected from the group consisting of fine silica powder, fine titanium oxide powder and fine aluminum oxide powder, and
- said carrier comprising carrier particles coated with a polymeric compound.
- 24. The two-component developer according to claim 23, wherein said toner particles are obtained by a process comprising the steps of:
- dispersing or dissolving a monomer composition containing at least a colorant, a charge control agent, or a mixture of these, and a polymerizable monomer, in free space formed in a polymeric medium, said polymeric medium comprising a polymer dissolved in a solvent;
- polymerizing the dispersed or dissolved monomer composition to obtain toner particles; and
- removing said toner particles from the polymeric medium.
- 25. The two-component developer according to claim 24, wherein said polymer has a weight average molecular weight from 3,000 to 150,000.
- 26. The two-component developer according to claim 24, wherein said polymer has a weight average molecular weight from 8,000 to 80,000.
- 27. The two-component developer according to claim 24, wherein said solvent comprises a member selected from the group consisting of a straight-chain or branched aliphatic alcohol, an aliphatic hydrocarbon, an aromatic hydrocarbon, a halogenated hydrocarbon, an ether, a fatty acid, an ester and a sulfur-containing compound.
- 28. The two-component developer according to claim 24, wherein said solvent comprises a lower alcohol.
- 29. The two-component developer according to claim 23, wherein said toner particles have a number average particle diameter of from 0.5 .mu.m to 4.0 .mu.m.
- 30. The two-component type developer according to claim 23, wherein said toner particles contain toner particles with a particle diameter of 6.0 .mu.m or larger in a proportion of not more than 1% by number.
- 31. The two-component developer according to claim 23, wherein said toner particles comprises a resin component having a number average molecular weight of from 3,000 to 1,000,000.
- 32. The two-component developer according to claim 23, wherein said carrier has a magnetic material comprising a ferromagnetic metal, an iron oxide or a compound containing an element showing ferromagnetism.
- 33. The two-component developer according to claim 23, wherein said carrier comprises a magnetic material dispersion carrier comprising a binder in which a magnetic material comprising a ferromagnetic metal, an iron oxide or a compound containing an element showing ferromagnetism is dispersed.
- 34. The two-component developer according to claim 23, wherein the fluidity improver has been subjected to disintegration treatment.
- 35. The two-component developer according to claim 23, wherein the fluidity improver has a specific surface area of not less than 350 m.sup.2 /g.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-123153 |
Apr 1993 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 0/7742,866 filed Oct. 13, 1995, now abandoned; which, in turn, is a division of application Ser. No. 08/233,324, filed Apr. 26, 1994, now U.S. Pat. No. 5,470,687.
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Divisions (1)
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Number |
Date |
Country |
Parent |
233324 |
Apr 1994 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
542866 |
Oct 1995 |
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