US4291111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitrogen-containing additives for magnetic toners having hydrophobic and hydrophilic moiety
Assignee: Xerox Corp
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Filing: 1979-02-09
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Granted: 1981-09-22
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Expires: 1999-02-09
Abstract
Abstract Magnetic toners, methods of their formation and utilization of the toners in various electrophotographic imaging systems is disclosed. The toners disclosed contain a nitrogen containing compound including, for example, amines and quaternary ammonium compounds. Toners containing such compounds are suitable for use in inductive development from a biased magnetic toner brush to an electrostatic image, and further subsequently such images may be transferred preferably by electrostatically type methods to a substrate such as plain bond paper.
Inventors
- 👤 Chin H. Lu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:39
CPC Classifications
B; B82; B82Y; B82Y15/00; G; G03; G03G; G03G9/00; G03G9/08; G03G9/083; G03G9/0831; G03G9/0832; G03G9/0833; G03G9/097; G03G9/09733; G03G9/09741; G03G9/09758; G03G9/09775; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/104
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
102 words
A single component field dependent toner that has a resistivity of 10 13 ohm/cm to 10 18 ohm/cm, and thus is conductive at high fields of up to 1,000 volts/cm, thereby allowing substantially complete transfer of the toner when said toner is utilized in an electrophotographic imaging system, this toner being comprised of a resin, a magnetic pigment, and between about 0.5 to about 10 weight percent of a nitrogen containing compound comprising at least one hydrophobic moiety and one hydrophilic moiety, the nitrogen containing compound being dimethyl dihydrogenated tallow ammonium chloride, tallow trimethylene diamine dioleate, distearyl dimethyl ammonium chloride, or stearylimidazoline.
Claim 2
Dependent Claim
102 words
A single component field dependent toner that has a resistivity of 10 13 ohm/cm to 10 18 ohm/cm, and thus is conductive at high fields of up to 1,000 volts/cm, thereby allowing substantially complete transfer of the toner when said toner is utilized in an electrophotographic imaging system, this toner being comprised of a resin, a magnetic pigment, and between about 0.5 to about 10 weight percent of a nitrogen containing compound comprising at least one hydrophobic moiety and one hydrophilic moiety, the nitrogen containing compound being dimethyl dihydrogenated tallow ammonium chloride, tallow trimethylene diamine dioleate, distearyl dimethyl ammonium chloride, or stearylimidazoline.
Claim 3
Dependent Claim
68 words
A single component field dependent toner in accordance with claim 1 wherein the resin is a styrene-n-butyl methacrylate copolymer, the magnetic pigment is Mapico Black, and the nitrogen containing compound is dimethyl dihyrgenated tallow ammonium chloride, said compound being present in an amount of 3 percent by weight thereby resulting in a toner that has a resistivity of 10 14 ohm/cm at field strength of about 40 volts/cm.
Claim 4
Dependent Claim
62 words
A single component field dependent toner in accordance with claim 1 wherein the resin is styrene-n-butyl methacrylate copolymer, the magnetic pigment is Mapico Black, and the nitrogen containing compound is tallow trimethylene diamine dioleate present in the amount of 3 percent by weight thereby resulting in a toner that has a resistivity of 10 15 ohm/cm at field strengths of 40 volts/cm.
Claim 5
Dependent Claim
61 words
A single component field dependent toner in accordance with claim 1 wherein the resin is a styrene-n-butyl methacrylate copolymer, the magnetic pigment is magnetite, and the nitrogen containing compound is stearyl imidazoline, present in an amount of 1 percent by weight, thereby resulting in a toner having a resistivity of 10 13 ohm/cm at a field strength of about 40 volts/cm.
Claim 6
Dependent Claim
60 words
A field dependent single component toner in accordance with claim 1 wherein the resin is styrene-n-butyl methacrylate copolymer, the magnetic pigment is Mapico Black, and the nitrogen containing compound is distearyl dimethyl ammonium chloride, present in the amount of 1 percent by weight, which toner has a resistivity of 10 16 ohm/cm at a field strength of about 80 volts/cm.
Claim 7
Dependent Claim
16 words
A field dependent single component toner in accordance with claim 1 wherein the resin is polystyrene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |