Claims
- 1. A color toner having a charge rising property Z not less than 70%, and wherein the charge rising property Z is represented as follows:Z=(Q20/Q600)×100 wherein Q20 represents a charge quantity of the toner when a carrier including the toner in an amount of not greater than 5% by weight is agitated for 20 seconds at a temperature of from 15 to 25° C. and a relative humidity of from 25 to 80%, and Q600 represents a charge quantity of the toner when the carrier is agitated for 600 seconds at a temperature of from 15 to 25° C. and a relative humidity of from 25 to 80%,wherein the toner when sieved with a sieve of 500 mesh, provides a residual toner remaining on the sieve having a circular degree of from 0.93 to 0.97 and a weight not greater than 10 mg when a pre-sieve weight is 100 g, and wherein the toner does not comprise a release agent.
- 2. The color toner of claim 1, further comprising a fluidity imparting agent comprising a particulate hydrophobic silica having a volume average particle diameter not greater than 0.05 μm and a particulate hydrophobic titanium oxide having a volume average particle diameter not greater than 0.05 μm.
- 3. The color toner according to claim 2, wherein the hydrophobic silica is present in an amount of from 0.3 to 1.5% by weight and the particulate hydrophobic titanium oxide is present in an amount of from 0.2 to 1.2% by weight.
- 4. The color toner according to claim 3, wherein the particulate hydrophobic titanium oxide is present in an amount of greater than that of the particulate hydrophobic silica.
- 5. The color toner according to claim 1, wherein the color toner has a volume average particle diameter not greater than 9 μm.
- 6. The color toner according to claim 1, wherein the color toner comprises fine color toner particles having a particle diameter not greater than 5 μm in an amount of not greater than 20% by number.
- 7. A method for manufacturing the color toner according to claim 1, comprising:providing a mother toner of the color toner; and mixing the mother toner having a weight M in a unit of kilogram with a fluidity imparting agent to provide the color toner using the mixer having a rotor, wherein the following relationship is satisfied: 50≦(V·T)/M≦200 wherein V represents a rotation speed of the rotor in a unit of m/sec, and T represents a mixing time in a unit of second.
- 8. A method for manufacturing the color toner according to claim 1, comprising:kneading a toner mixture comprising a binder resin, a colorant, a releasing agent and a charge controlling agent while heating; cooling the toner mixture; first pulverizing the toner mixture with a jet pulverizer having a collision plate and blowing compressed air; and second pulverizing the pulverized toner mixture with a rotor pulverizer having a container serving as an outer wall, and a rotor which is concentric with the container, while classifying the second pulverized toner mixture with an air classifier, wherein the rotor pulverizer is connected with the classifier, and wherein the second pulverizing step is performed the toner mixture circulates through the rotor pulverizer and the classifier.
- 9. An intermediate transfer material having a volume resistivity of from 109 to 1013 Ω·cm, wherein a friction coefficient of a surface of the intermediate transfer material, which is to be contacted with the image bearing member, is not greater than 0.4.
- 10. The toner of claim 1, wherein the volume average particle diameter is not greater than 9 μm.
- 11. The toner of claim 1, wherein the toner has a circular degree of from 0.93 to 0.97.
- 12. The toner of claim 1, comprising fine toner particles having a particle diameter not greater than 5 μm in an amount of not greater than 20% by weight.
- 13. The toner of claim 1, further comprising a fluidity imparting agent.
- 14. The toner of claim 1, further comprising a particulate hydrophobic silica.
- 15. The toner of claim 1, further comprising a particulate hydrophobic titanium oxide.
- 16. The toner of claim 1, comprising a particulate hydrophobic silica and a particulate hydrophobic titanium oxide.
- 17. The toner of claim 14, wherein the particulate hydrophobic silica is present in an amount of from 0.3 to 1.5% by weight.
- 18. The toner of claim 15, wherein the particulate hydrophobic titanium oxide is present in an amount of from 0.2 to 1.2% by weight.
- 19. The toner of claim 1, further comprising a binder resin, a colorant and a charge controlling agent.
- 20. The toner of claim 19, wherein the binder resin is selected from the group consisting of polystyrene, polychlorostyrene, polyvinyl toluene, styrene copolymers, styrene-p-chlorostyrene copolymers, styrene-propylene copolymers, styrene-vinyl toluene copolymers, styrene-vinyl naphthalene copolymers, styrene-methyl acrylate copolymers, styrene-ethyl acrylate copolymers, styrene-butyl acrylate copolymers, styrene-octyl acrylate copolymers, styrene-methyl methacrylate copolymers, styrene-ethyl methacrylate copolymers, styrene-butyl methacrylate copolymers, styrene-methyl α-chloromethacrylate copolymers, styrene-acrylonitrile copolymers, styrene-vinyl methyl ketone copolymers, styrene-butadiene copolymers, styrene-isoprene copolymers, styrene-acrylonitrile-indene copolymers, styrene-maleic acid copolymers, styrene-maleic acid ester copolymer, polymethyl methacrylate, polybutyl methacrylate, polyvinyl chloride, polyvinyl acetate, polyesters, polyvinyl butyral resins, and polyacrylic acid resins.
- 21. The toner of claim 19, wherein the colorant is selected from the group consisting of Nigrosine dyes, Aniline Blue, chalco oil blue, Du Pont Oil Red, Quinoline Yellow, Methylene Blue chloride, Phthalocyanine Blue, Phthalocyanine Green, Hansa Yellow, Rhodamine 6C Lake, Chrome Yellow, quinacridone, Benzidine Yellow, Malachite Green, Malachite Green hexalate, Rose Bengal, monoazo dyes, monoazo pigments, diazo dyes, diazo pigments, trisazo dyes and trisazo pigments.
- 22. The toner of claim 19, wherein the charge controlling agent is selected from the group consisting of quaternary ammonium salts, metal salts of imidazole, metal complexes of imidazole, salts of salicylic acid, organic boron salts and calixaren compounds.
- 23. The toner of claim 19, further comprising a plasticizer.
- 24. The toner of claim 23, wherein the plasticizer is selected from the group consisting of dibutylphthalate and dioctylphthalate.
- 25. The toner of claim 19, further comprising a second fluidity imparting agent.
- 26. The toner of claim 25, wherein the second fluidity imparting agent is selected from the group consisting of fine powders of silica, titanium oxide, aluminum oxide, magnesium fluoride, silicon carbide, boron carbide, titanium carbide, zirconium carbide, boron nitride, titanium nitride, zirconium nitride, magnetite, molybdenum disulfide, fluorine-containing resins and acrylic resins.
Priority Claims (1)
Number |
Date |
Country |
Kind |
11-227552 |
Aug 1999 |
JP |
|
Parent Case Info
This application is a Divisional application of application Ser. No. 09/636,734 filed on Aug. 11, 2000, now U.S. Pat. No. 6,355,389.
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