Claims
- 1. A toner composition comprised of binder, colorant, and a surface additive of a coated silica and wherein said silica possesses a BET surface area, in m2/g of from about 35 to about 65, a bulk density, in grams/liter, of from about 40 to about 60, and and wherein the size diameter determined from the BET measurement is from about 20 to about 100 nanometers.
- 2. A toner in accordance with claim 1 wherein the coating is comprised of a mixture of aminopolysiloxane and hexamethyldisilazane.
- 3. A negatively charged toner comprised of resin, colorant, optional wax and a surface additive mixture of a coated fumed silica, and metal oxide and wherein said silica possesses a BET surface area, in m2/g of about from about 35 to about 65, a bulk density, in grams/liter, of from about 40 to about 60, and and wherein the size diameter determined by the BET measurement is from about 20 to about 100 nanometers.
- 4. A toner in accordance with claim 3 wherein the titanium dioxide is coated with a decylsilane, and the silica core is comprised substantially of silicon dioxide, and with a coating thereover comprised of a mixture of aminopolysiloxane and hexamethyldisilazane.
- 5. A toner in accordance with claim 1 wherein the resin is a styrene acrylate, a styrene methacrylate, a polyester, or a styrene butylacrylate.
- 6. A toner in accordance with claim 1 wherein the coated silica is present in an amount of from about 0.05 to about 7 weight percent.
- 7. A toner in accordance with claim 2 wherein the coating on the silica is comprised of aminopolysiloxane present in an amount of from about 1 to about 5 parts per hundred based on the silica core and the hexamethyldisilazane is present in an amount of from about 65 to about 85 parts per hundred based on the silica core amount.
- 8. A toner in accordance with claim 1 wherein said coated silica possesses a BET surface area, in m2/g of from about 40 to about 50, a bulk density, in grams/liter, of from about 45 to about 55, and and wherein the size diameter of said coated silica determined from said BET measurement is from about 25 to about 75 nanometers.
- 9. A toner in accordance with claim 2 wherein the coating on the silica is comprised of aminopolysiloxane in an amount of from about 2 to about 4 parts per hundred and the hexamethyldisilazane in an amount of from about 70 to about 80 parts per hundred.
- 10. A toner in accordance with claim 2 wherein the silica additive is of a size diameter of from about 25 to about 75 nanometers; and, the aggregate silica additive size diameter is about 225 to about 400 nanometers.
- 11. A toner in accordance with claim 2 wherein the silica additive is of a size diameter of from about 30 to about 50 nanometers; and the aggregate additive size diameter is about 300 to about 375 nanometers.
- 12. A toner in accordance with claim 2 with a cohesivity of about 4 to about 40 percent, with a stable triboelectrical charge of from about 10 to about 35 microcoulombs per gram, a q/d of from about 0.2 to about 1.1 femtocoulombs per micron, and with an admix time of from less than about 30 seconds, or an admix time of from about 1 to about 29 seconds.
- 13. A toner in accordance with claim 2 further containing toner additives.
- 14. A toner in accordance with claim 13 wherein the additives are charge additives, waxes, metal salts, metal salts of fatty acids, metal oxides, or mixtures thereof.
- 15. A toner composition in accordance with claim 1 further containing a wax component with a molecular weight, Mw of from about 1,000 to about 20,000.
- 16. A toner composition in accordance with claim 15 wherein the wax component is selected from the group consisting of polyethylene and polypropylene.
- 17. A toner in accordance with claim 1 wherein the colorant is a pigment, or a dye.
- 18. A toner in accordance with claim 2 wherein the colorant is a pigment.
- 19. A developer comprised of the toner of claim 1 and carrier.
- 20. A developer in accordance with claim 19 wherein the carrier contains a polymer coating.
- 21. A developer in accordance with claim 19 wherein the carrier contains a mixture of polymer coatings.
- 22. A toner in accordance with claim 1 further including a wax and a coated titanium dioxide, and wherein the size diameter of said silica and said titanium dioxide are form about 35 to about 50 nanometers.
- 23. A toner in accordance with claim 22 wherein said silica and said titanium dioxide are each present in an amount of about 0.05 to about 7 weight percent.
- 24. A toner in accordance with claim 3 wherein said silica and said metal oxide are each present in an amount of about 2 to about 4 weight percent.
- 25. A toner in accordance with claim 2 wherein the coating on the silica is comprised of aminopolysiloxane in an amount of about 3 parts per hundred based on the silica core and the hexamethyldisilazane is present in an amount of about 75 parts per hundred based on the silica core amount.
- 26. An imaging process which comprises the development of an electrostatic image with the toner of claim 1.
- 27. A process in accordance with claim 26 wherein a photoconductor is charged, exposed with light to form an electrostatic image, followed by developing the electrostatic image with the toner of claim 1, transferring the developed image to a substrate, fixing the image onto the substrate, and optionally cleaning or removing any residual toner from the photoconductor.
- 28. An imaging apparatus containing the toner of claim 1.
- 29. An apparatus in accordance with claim 28 wherein the apparatus comprises a photoconductor, a means to charge the photoconductor, a means to expose or form an electrostatic image onto the photoconductor, a means to develop the toner onto the electrostatic image formed on the photoconductor, a means to transfer the developed toner, a means to fix the toner and an optional means to clean or remove any residual toner from the photoreceptor.
- 30. A two component developer apparatus containing the toner of claim 1, and which apparatus includes one or more magnetic brush rolls, a sump to contain the developer material, a means to add toner to the developer material in the sump, a means to mix the developer in the sump, a means to load the developer material onto the magnetic brush roll or rolls, and a means to supply biases to the magnetic brush roll.
- 31. A one component developer apparatus containing the toner of claim 1 and which apparatus comprises a donor roll, toner sump, a means to add toner to the sump, a means to mix the toner in the sump, a means to load toner onto the donor roll, a means to charge the toner on the donor roll, and a means to supply the biases to the donor roll.
- 32. A hybrid scavengeless developer apparatus containing the toner of claim 1, and which hybrid scavengeless developer apparatus comprises a donor roll, a means to supply the biases to the magnetic brush roll, the donor roll, and any electrodes present, and wherein by suitable spacing of the donor roll to photoconductor the toner moves from the donor roll to the image on the photoconductor, and wherein the movement of toner to the photoconductor is assisted by electrodes between the donor roll and photoconductor or electrodes in the donor roll.
- 33. A toner in accordance with claim 1 wherein the core of the silica is comprised of silicon dioxide.
- 34. A toner in accordance with claim 2 wherein said aminopolysiloxane is γ-amino trimethoxy or trimethylsilane.
- 35. A process which comprised the development of an image with the toner of claim 1 and wherein the image transfer is from about 90 to about 98 percent.
- 36. A process in accordance with claim 35 wherein the toner further includes on the surface a coated titanium dioxide and the size of the coated silica and coated titanium dioxide are each from about 35 to about 50 nanometers.
COPENDING APPLICATIONS
[0001] Illustrated in copending applications, U.S. Ser. No. (not yet assigned—D/97363), and U.S. Ser. No. (not yet assigned—D/97365, the disclosures of each application being totally incorporated herein by reference are toners with coated silicas.
[0002] The appropriate components and processes of the above copending applications may be selected for the present invention in embodiments thereof.
Divisions (1)
|
Number |
Date |
Country |
Parent |
09132185 |
Aug 1998 |
US |
Child |
09773485 |
Feb 2001 |
US |