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US4312933A
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Method of imaging using nitrogen-containing additives for magnetic toners
Assignee: Xerox Corp
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Filing: 1981-03-30
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Granted: 1982-01-26
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Expires: 2001-03-30
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 17:44
CPC Classifications
B; B82; B82Y; B82Y15/00; G; G03; G03G; G03G9/00; G03G9/08; G03G9/083; G03G9/0831; G03G9/0833; G03G9/097; G03G9/09733; G03G9/09741; G03G9/09775; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/104
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
191 words
A method of imaging using a single component field dependent toner having a resistivity of 10 11 ohm-cm to 10 20 ohm-cm and being conductive at high field strength of up to about 1,000 volts/cm., comprising forming an electrostatic latent image, contacting the image with a toner comprising a resin, magnetic pigment, and between about 0.1 and 10 percent by weight of a nitrogen containing compound which comprises a hydrophobic moiety and a hydrophilic moiety wherein the nitrogen containing compound is selected from the group consisting of amines of the following formulas: ##STR4## wherein R is an aliphatic radical containing from about 8 to about 22 carbon atoms and R 1 and R 2 are hydrocarbon radicals containing from about 1 to about 22 carbon atoms and a quaternary ammonium compound of the formula: ##STR5## wherein at least one R is a hydrocarbon containing from about 8 to 22 carbon atoms and each other R is selected from hydrogen, and a hydrocarbon having from 1 to about 22 carbon atoms and A is an anion, and subsequently transferring the image to a substrate whereby substantially complete transfer of the toner results.
Claim 2
Independent Claim
191 words
A method of imaging using a single component field dependent toner having a resistivity of 10 11 ohm-cm to 10 20 ohm-cm and being conductive at high field strength of up to about 1,000 volts/cm., comprising forming an electrostatic latent image, contacting the image with a toner comprising a resin, magnetic pigment, and between about 0.1 and 10 percent by weight of a nitrogen containing compound which comprises a hydrophobic moiety and a hydrophilic moiety wherein the nitrogen containing compound is selected from the group consisting of amines of the following formulas: ##STR4## wherein R is an aliphatic radical containing from about 8 to about 22 carbon atoms and R 1 and R 2 are hydrocarbon radicals containing from about 1 to about 22 carbon atoms and a quaternary ammonium compound of the formula: ##STR5## wherein at least one R is a hydrocarbon containing from about 8 to 22 carbon atoms and each other R is selected from hydrogen, and a hydrocarbon having from 1 to about 22 carbon atoms and A is an anion, and subsequently transferring the image to a substrate whereby substantially complete transfer of the toner results.
Claim 3
Dependent Claim
17 words
A method in accordance with claim 1 wherein the nitrogen containing compound is tallow trimethylene diamine dioleate.
Claim 4
Dependent Claim
15 words
A method in accordance with claim 1 wherein the nitrogen containing compound is stearyl imidazoline.
Claim 5
Dependent Claim
17 words
A method in accordance with claim 1 wherein the nitrogen containing compound is distearyl dimethyl ammonium chloride.
Claim 6
Dependent Claim
18 words
A method in accordance with claim 1 wherein the nitrogen containing compound is dimethyl dihydrogenated tallow ammonium chloride.
Claim 7
Dependent Claim
22 words
A method in accordance with claim 1 wherein the magnetic pigment comprises about 45 to about 75 weight percent of the toner.
Claim 8
Dependent Claim
13 words
A method in accordance with claim 1 wherein the magnetic pigment comprises magnetite.
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) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |