US4487825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive single component electrophotographic magnetic toner
Assignee: Xerox Corp
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Filing: 1981-01-22
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Granted: 1984-12-11
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Expires: 2001-01-22
Abstract
Abstract This invention relates to a conductive single component magnetic dry toner comprised of resins selected from polystyrene allyl alcohol copolymers, and epoxy resins, a magnetic material such as magnetite, and a conductive carbon black which is adhered and/or embedded on the surface of the copolymer or epoxy resin-magnetic material mixture. Such toner compositions, which have excellent conductivity, superior flow properties and low melt fusing temperatures, 95° C.-130° C., are useful for causing the development of images in commercial printers and recorders such as the Versatec printers.
Inventors
- 👤 Robert J. Gruber
- 👤 John F. Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:56
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08706; G03G9/08708; G03G9/08722; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/104
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
163 words
A conductive single component magnetic dry toner composition comprised of from about 40 percent by weight to about 60 percent by weight of a polystyrene allyl alcohol copolymer resin, which resin is comprised of from about 50 percent to about 90 percent by weight of polystyrene, and from about 10 percent to about 50 percent by weight of allyl alcohol, and wherein the molecular weight of the polystyrene ranges from about 3,000 to about 100,000; and from about 60 percent by weight to about 40 percent by weight of a magnetic material, said toner composition further containing from about 0.5 percent to about 4 percent of a conductive carbon black which is adhered to or embedded in the surface of the polystyrene allyl alcohol copolymer resin magnetic mixture by heat spheroidization, thereby resulting in a toner composition having a conductivity of from 10 -4 to 10 -10 (ohms/cm) -1 , and a fusing temperature of from about 95° C. to about 130° C.
Claim 2
Dependent Claim
163 words
A conductive single component magnetic dry toner composition comprised of from about 40 percent by weight to about 60 percent by weight of a polystyrene allyl alcohol copolymer resin, which resin is comprised of from about 50 percent to about 90 percent by weight of polystyrene, and from about 10 percent to about 50 percent by weight of allyl alcohol, and wherein the molecular weight of the polystyrene ranges from about 3,000 to about 100,000; and from about 60 percent by weight to about 40 percent by weight of a magnetic material, said toner composition further containing from about 0.5 percent to about 4 percent of a conductive carbon black which is adhered to or embedded in the surface of the polystyrene allyl alcohol copolymer resin magnetic mixture by heat spheroidization, thereby resulting in a toner composition having a conductivity of from 10 -4 to 10 -10 (ohms/cm) -1 , and a fusing temperature of from about 95° C. to about 130° C.
Claim 3
Dependent Claim
18 words
A conductive single component magnetic toner in accordance with claim 1 wherein the magnetic material is Mapico black.
Claim 4
Dependent Claim
90 words
A conductive magnetic dry toner composition in accordance with claim 1 wherein the polystyrene allyl alcohol copolymer, which consists of 80 percent of styrene and 20 percent of allyl alcohol is present in an amount of 48 percent by weight, the magnetic pigment is present in an amount of 50 percent by weight, and the conductive carbon black is present in an amount of 2 percent by weight, resulting in a toner composition which has a conductivity of 8×10 -7 (ohms/cm) -1 , and a fusing temperature of 130° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |