US4391890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developer compositions containing alkyl pyridinium toluene sulfonates
Assignee: Xerox Corp
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Filing: 1981-12-03
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Granted: 1983-07-05
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Expires: 2001-12-03
Abstract
Abstract This invention is directed to developer compositions comprised of toner particles and carrier particles, the toner particles being comprised of resin particles, pigment particles, and from about 0.1 to about 10 percent based on the weight of the toner particles of an alkyl pyridinium toluene sulfonate charge enhancing additive of the formula: ##STR1## wherein R is an alkyl radical containing from about 12 carbon atoms to about 25 carbon atoms, which compositions are useful for causing the development of images in electrostatographic imaging systems.
Inventors
- 👤 Chin H. Lu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:49
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09733; G03G9/09758
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
67 words
An electrostatic developer composition comprised of toner particles and carrier particles, the toner particles being comprised of resin particles, pigment particles, and from about 0.1 to about 10 percent based on the weight of the toner particles of an alkyl pyridinium toluene sulfonate charge enhancing additive of the formula: ##STR5## wherein R is an alkyl radical containing from about 12 carbon atoms to about 25 carbon atoms.
Claim 2
Dependent Claim
67 words
An electrostatic developer composition comprised of toner particles and carrier particles, the toner particles being comprised of resin particles, pigment particles, and from about 0.1 to about 10 percent based on the weight of the toner particles of an alkyl pyridinium toluene sulfonate charge enhancing additive of the formula: ##STR5## wherein R is an alkyl radical containing from about 12 carbon atoms to about 25 carbon atoms.
Claim 3
Dependent Claim
25 words
A developer composition in accordance with claim 1 wherein R is an alkyl radical containing from about 14 carbon atoms to about 20 carbon atoms.
Claim 4
Dependent Claim
12 words
A developer composition in accordance with claim 1 wherein R is cetyl.
Claim 5
Dependent Claim
26 words
A developer composition in accordance with claim 1 wherein the toner resin is a styrene/n-butylmethacrylate copolymer or a styrene/butadiene copolymer, and the pigment is carbon black.
Claim 6
Dependent Claim
28 words
A developer composition in accordance with claim 4 wherein the styrene/n-butylmethacrylate is comprised of 65 percent by weight of styrene, and of 35 percent by weight of n-butylmethacrylate.
Claim 7
Dependent Claim
34 words
A developer composition in accordance with claim 4 wherein the styrene/butadiene copolymer is comprised of styrene in an amount of 91 percent by weight, and butadiene in an amount of 9 percent by weight.
Claim 8
Dependent Claim
18 words
A developer composition in accordance with claim 1 wherein the charge enhancing additive is cetyl pyridinium para-toluene sulfonate.
Claim 9
Dependent Claim
18 words
A developer composition in accordance with claim 1 wherein the charge enhancing additive is stearyl pyridinium para-toluene sulfonate.
Claim 10
Dependent Claim
18 words
A developer composition in accordance with claim 1 wherein the charge enhancing additive is myristyl pyridinium para-toluene sulfonate.
Claim 11
Dependent Claim
22 words
A developer composition in accordance with claim 1 wherein the carrier consists of a steel core coated with a vinylidene fluoride resin.
Claim 12
Dependent Claim
22 words
A developer composition in accordance with claim 1 wherein the carrier consists of a steel core coated with a vinylidene fluoride resin.
Claim 13
Independent Claim
92 words
A method of developing images which comprises forming a negative electrostatic latent image on an imaging member, contacting the image with a positively charged electrostatic developing composition comprised of toner particles and carrier particles, the toner particles being comprised of resin particles, pigment particles, and from about 0.1 percent to about 10 weight percent based on the weight of the toner particles of an alkyl pyridinium toluene sulfonate charge enhancing additive of the formula: ##STR6## wherein R is an alkyl radical containing from about 12 carbon atoms to about 25 carbon atoms.
Claim 14
Independent Claim
92 words
A method of developing images which comprises forming a negative electrostatic latent image on an imaging member, contacting the image with a positively charged electrostatic developing composition comprised of toner particles and carrier particles, the toner particles being comprised of resin particles, pigment particles, and from about 0.1 percent to about 10 weight percent based on the weight of the toner particles of an alkyl pyridinium toluene sulfonate charge enhancing additive of the formula: ##STR6## wherein R is an alkyl radical containing from about 12 carbon atoms to about 25 carbon atoms.
Claim 15
Dependent Claim
33 words
A method in accordance with claim 12 wherein R is an alkyl radical of from about 14 carbon atoms to about 20 carbon atoms, and the imaging member is an organic photoreceptor material.
Claim 16
Dependent Claim
11 words
A method in accordance with claim 12 wherein R is cetyl.
Claim 17
Dependent Claim
39 words
A method in accordance with claim 12 wherein the toner resin is a styrene/n-butylmethacrylate copolymer, or a styrene/butadiene copolymer, the pigment is carbon black, and the carrier is comprised of a steel core coated with a vinylidene fluoride resin.
Claim 18
Dependent Claim
17 words
A method in accordance with claim 12 wherein the charge enhancing additive is cetyl pyridinium para-toluene sulfonate.
Claim 19
Dependent Claim
17 words
A method in accordance with claim 12 wherein the charge enhancing additive is stearyl pyridinium para-toluene sulfonate.
Claim 20
Dependent Claim
17 words
A method in accordance with claim 12 wherein the charge enhancing additive is myristyl pyridinium para-toluene sulfonate.
Claim 21
Dependent Claim
34 words
A method of imaging in accordance with claim 13 wherein the organic photoreceptor material is comprised of a substrate, overcoated with a photogenerating layer, which in turn is overcoated with a charge transport layer.
Claim 22
Dependent Claim
24 words
A method of imaging in accordance with claim 19 wherein the photogenerating layer is comprised of metal free phthalocyanines, metal phthalocyanines, or vanadyl phthalocyanine.
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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) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |