US4480021A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner compositions containing negative charge enhancing additives
Assignee: Xerox Corp
•
Filing: 1983-03-10
•
Granted: 1984-10-30
•
Expires: 2003-03-10
Abstract
Abstract This invention is directed to a negatively charged toner compositions comprised of resin particles and pigment particles, and from about 0.1 percent by weight to about 20 percent by weight, of an aryl sulfone, or aryl alkyl sulfonamide negative charge enhancing additive of the following formulas. R.sub.1 --SO.sub.2 --R.sub.2 I R.sub.3 --SO.sub.2 --NH--R.sub.4 II wherein R 1 is an alkyl group containing from about 6 carbon atoms to about 22 carbon atoms, or an aryl group, R 2 is an aryl group containing from about 6 carbon atoms to about 18 carbon atoms, R 3 is an aryl group, and R 4 is an alkyl group independent from R 1 , containing from about 6 carbon atoms to about 22 carbon atoms, or an aryl group.
Inventors
- 👤 Chin H. Lu
- 👤 Christopher J. AuClair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:17
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09733; G03G9/09775
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
80 words
A negatively charged toner composition comprised of resin particles, and pigment particles, and from about 0.1 percent to about 20 percent by weight of an aryl sulfone negative charge exhancing additive of the formula R 1 --SO 2 --R 2 wherein R 1 is an alkyl group containing from about 6 carbon atoms to about 22 carbon atoms, or an aryl group, and R 2 is an aryl group containing from about 6 carbon atoms to about 18 carbon atoms.
Claim 2
Dependent Claim
80 words
A negatively charged toner composition comprised of resin particles, and pigment particles, and from about 0.1 percent to about 20 percent by weight of an aryl sulfone negative charge exhancing additive of the formula R 1 --SO 2 --R 2 wherein R 1 is an alkyl group containing from about 6 carbon atoms to about 22 carbon atoms, or an aryl group, and R 2 is an aryl group containing from about 6 carbon atoms to about 18 carbon atoms.
Claim 3
Dependent Claim
43 words
A toner composition in accordance with claim 1 wherein R 1 is an alkyl group containing from about 12 carbon atoms to about 18 carbon atoms, and R 2 is an aryl group containing from 6 carbon atoms to about 18 carbon atoms.
Claim 4
Dependent Claim
18 words
A toner composition in accordance with claim 1 wherein the charge enhancing additive is isopropyl biphenyl para-tolyl sulfone.
Claim 5
Dependent Claim
17 words
A toner composition in accordance with claim 1 wherein the charge enhancing additive is para-tolyl stearyl sulfone.
Claim 6
Dependent Claim
36 words
A toner composition in accordance with claim 1 wherein the aryl sulfone charge enhancing additive is stearyl para-tolyl sulfone, cetyl p-tolyl sulfone, naphthyl para-tolyl sulfone, myristyl para-tolyl sulfone, stearyl para-xylyl sulfone, or isopropyl biphenyl para-tolyl sulfone.
Claim 7
Dependent Claim
19 words
A toner composition in accordance with claim 1 wherein the resin particles are comprised of a styrene/n-butyl methacrylate copolymer.
Claim 8
Dependent Claim
25 words
A toner composition in accordance with claim 1 wherein the pigment particles are carbon black, magnetite, cyan, magenta, yellow, lithol scarlet red, or mixtures thereof.
Claim 9
Dependent Claim
17 words
A toner composition in accordance with claim 1 wherein the pigment particles are comprised of red pigments.
Claim 10
Dependent Claim
35 words
A developer composition comprised of resin particles, pigment particles, carrier particles, and from about 0.1 percent by weight to about 20 percent by weight of the aryl sulfones negative charge enhancing additives of claim 1.
Claim 11
Dependent Claim
18 words
A developer composition in accordance with claim 9 wherein the charge enhancing additive is isopropyl biphenyl para-tolyl sulfone.
Claim 12
Dependent Claim
17 words
A developer composition in accordance with claim 9 wherein the charge enhancing additive is para-tolyl stearyl sulfone.
Claim 13
Dependent Claim
19 words
A developer composition in accordance with claim 9 wherein the resin particles are comprised of a styrene/n-butyl methacrylate copolymer.
Claim 14
Dependent Claim
28 words
A developer composition in accordance with claim 9 wherein the carrier particles consist of a ferrite core coated with a terpolymer of styrene, methyl methacrylate, and a silane.
Claim 15
Dependent Claim
21 words
A developer composition in accordance with claim 9 wherein the carrier particles consist of a steel core coated with ethyl cellulose.
Claim 16
Dependent Claim
19 words
A developer composition in accordance with claim 9 wherein the pigment particles are comprised of carbon black, or magnetite.
Claim 17
Dependent Claim
30 words
A developer composition in accordance with claim 9 wherein the pigment particles are comprised of a material selected from cyan, magenta, and yellow pigments, litho scarlet red, or mixtures thereof.
Claim 18
Dependent Claim
15 words
A developer composition in accordance with claim 16 wherein the magenta pigment is 2,9-dimethyl quinacridone.
Claim 19
Dependent Claim
46 words
A method for developing electrostatic latent image comprising forming a positive electrostatic latent image on an inorganic photoresponsive device, contacting the resulting image with the developer composition of claim 9 followed by transferring the image to a suitable substrate, and optionally permanently affixing the image thereon.
Claim 20
Dependent Claim
40 words
A method of imaging in accordance with claim 18 wherein the pigment particles are comprised of cyan, magenta, and yellow pigments, litho scarlet red, or mixtures thereof and the charge enhancing additive is para-tolyl stearyl sulfone, isopropyl biphenyl para-tolyl sulfone.
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) | 1987-10-30 | 1988-04-30 | 1988-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-30 | 1992-04-30 | 1992-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-30 | 1996-04-30 | 1996-10-30 | $7700.00 | Window Closed / Lapsed |