US4254205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive toners containing alkyl picolinium compounds as charge control agents
Assignee: Xerox Corp
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Filing: 1980-04-14
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Granted: 1981-03-03
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Expires: 2000-04-14
Abstract
Abstract Disclosed are positive toners comprised of a toner resin, a colorant, or pigment, and an alkyl picolinium compound selected from the group consisting of those represented by the following formula: ##STR1## wherein A is an anion which in a preferred embodiment is a halide such as chloride, bromide, or iodide, sulphate, sulphonate, phosphate and nitrate, and R is a hydrocarbon radical containing from 8 to 22 carbon atoms and preferably from about 12 to 18 carbon atoms. These toners when combined with carrier materials can be used as developers in electrophotographic systems.
Inventors
- 👤 Chin H. Lu
- 👤 Peter F. Erhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:25
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09733; G03G9/09758; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
75 words
A method of imaging comprising forming an electrostatic latent image on a photoreceptor by contacting the image with a positively dry developer comprising a resin material, a colorant, a carrier, and an alkyl picolinium compound selected from those of the formula: ##STR3## wherein A is an anion and R is a hydrocarbon radical containing from 8 to 22 carbon atoms and subsequently transferring the developed image to a substrate and permanently affixing the image thereto.
Claim 2
Independent Claim
75 words
A method of imaging comprising forming an electrostatic latent image on a photoreceptor by contacting the image with a positively dry developer comprising a resin material, a colorant, a carrier, and an alkyl picolinium compound selected from those of the formula: ##STR3## wherein A is an anion and R is a hydrocarbon radical containing from 8 to 22 carbon atoms and subsequently transferring the developed image to a substrate and permanently affixing the image thereto.
Claim 3
Dependent Claim
56 words
A method of imaging in accordance with claim 1 wherein the alkyl picolinium compound is cetyl alpha picolinium chloride, cetyl alpha picolinium bromide, cetyl beta picolinium chloride, or cetyl gamma picolinium bromide, and the toner resin is a copolymer of styrene/n-butyl methacrylate, a copolymer of styrene/butadiene, or a polystyrene resin, and the pigment is carbon black.
Claim 4
Dependent Claim
55 words
A method of imaging in accordance with claim 1 wherein the alkyl picolinium compound is present in an amount of from 0.1 percent to 10 percent by weight based on the weight of toner, the resin is a copolymer of styrene/n-butyl methacrylate and the carrier is steel coated with polyvinylidene fluoride or vinyl fluoride resins.
Claim 5
Dependent Claim
40 words
A method in accordance with claim 1 wherein the colorant or pigment is coated with the alkyl picolinium compound in an amount of from 1 percent to 6 percent by weight of the pigment and the photoreceptor is negatively charged.
Claim 6
Dependent Claim
12 words
A method in accordance with claim 4 wherein the photoreceptor is polyvinylcarbazole.
Claim 7
Dependent Claim
28 words
A method of imaging in accordance with claim 1 wherein 10 to about 200 parts by weight of carrier to 1 part by weight of toner is present.
Claim 8
Dependent Claim
21 words
A method of imaging in accordance with claim 1 wherein the carrier is charged negatively and the toner is charged positively.
Claim 9
Dependent Claim
21 words
A method of imaging in accordance with claim 3 wherein the carrier is charged negatively and the toner is charged positively.
References Cited (Backward Citations)
US3850642A
Cited
US3893935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |