US4298672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toners containing alkyl pyridinium compounds and their hydrates
Assignee: Xerox Corp
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Filing: 1978-06-01
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Granted: 1981-11-03
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Expires: 1998-06-01
Abstract
Abstract Disclosed is a positively charged developer comprised of a toner and an alkyl pyridinium compound and its hydrate of the formula <IMAGE> wherein A is an anion selected from halides such as chlorine, bromine, iodine, sulfate, sulfonate, nitrate and borate, and R is a hydrocarbon radical containing from about 8 to about 22 carbon atoms and preferably from 12 to 18 carbon atoms.
Inventors
- 👤 Chin H. Lu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:19
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09733; G03G9/09758
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
71 words
A positively charged dry particulate electrostatic toner composition in combination with a particulate carrier, said toner consisting essentially of a resin component, a pigment component and from about 0.1 to 10 percent based on the weight of toner of an alkyl pyridinium compound or its hydrate of the formula: ##STR3## wherein R is a hydrocarbon radical containing from about 15 to about 18 carbon atoms, and A is chloride or bromide.
Claim 2
Dependent Claim
71 words
A positively charged dry particulate electrostatic toner composition in combination with a particulate carrier, said toner consisting essentially of a resin component, a pigment component and from about 0.1 to 10 percent based on the weight of toner of an alkyl pyridinium compound or its hydrate of the formula: ##STR3## wherein R is a hydrocarbon radical containing from about 15 to about 18 carbon atoms, and A is chloride or bromide.
Claim 3
Dependent Claim
17 words
A composition in accordance with claim 1 wherein the pigment is coated with the alkyl pyridinium compound.
Claim 4
Dependent Claim
16 words
A composition in accordance with claim 1 wherein the alkyl pyridinium compound is cetyl pyridinium chloride.
Claim 5
Dependent Claim
34 words
A composition in accordance with claim 1 wherein the resin used is a styrene copolymer of n-butyl methacrylate, the pigment used is carbon black and the alkyl pyridinium compound used is cetyl pyridinium chloride.
Claim 6
Dependent Claim
21 words
A composition in accordance with claim 1 wherein the resin is a copolymer of styrene/n-butyl methacrylate and the pigment is magnetite.
Claim 7
Dependent Claim
26 words
A composition in accordance with claim 1 wherein the carrier is selected from perfluoroalkoxy fluoropolymer coated Hoeganaes steel carrier, and vinylidene fluoride resin coated steel carrier.
Claim 8
Independent Claim
102 words
A method of imaging comprising forming a negative electrostatic latent image on a photoreceptor, contacting the image with a positively charged dry particulate electrostatic toner, and carrier, the toner consisting essentially of a resin material, a pigment material and about from 0.1 to 10 weight percent based on the weight of toner of an alkyl pyridinium compound or its hydrate of the formula: ##STR4## wherein A is chloride or bromide and R is a hydrocarbon radical containing from about 15 to about 18 carbon atoms, and subsequently transferring the developed latent image to a permanent substrate and permanently affixing the image thereto.
Claim 9
Independent Claim
102 words
A method of imaging comprising forming a negative electrostatic latent image on a photoreceptor, contacting the image with a positively charged dry particulate electrostatic toner, and carrier, the toner consisting essentially of a resin material, a pigment material and about from 0.1 to 10 weight percent based on the weight of toner of an alkyl pyridinium compound or its hydrate of the formula: ##STR4## wherein A is chloride or bromide and R is a hydrocarbon radical containing from about 15 to about 18 carbon atoms, and subsequently transferring the developed latent image to a permanent substrate and permanently affixing the image thereto.
Claim 10
Dependent Claim
17 words
A method in accordance with claim 7 wherein the alkyl pyridinium compound is coated on the pigment.
Claim 11
Dependent Claim
16 words
A method in accordance with claim 7 wherein the alkyl pyridinium compound is cetyl pyridinium chloride.
Claim 12
Dependent Claim
31 words
A method in accordance with claim 7 wherein the resin is a copolymer of styrene n-butyl methacrylate, the pigment is carbon black, and the alkyl pyridinium compound is cetyl pyridinium chloride.
Claim 13
Dependent Claim
12 words
A method in accordance with claim 7 wherein the pigment is magnetite.
Claim 14
Dependent Claim
20 words
The invention in accordance with claim 1 or 7 wherein the alkyl pyridinium compound is blended with the toner resin.
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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) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |