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Patent US4442189A successfully refreshed from Google Patents.
US4442189A
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Toner compositions containing polyanhydride resins
Assignee: Xerox Corp
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Filing: 1983-01-26
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Granted: 1984-04-10
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Expires: 2003-01-26
Abstract
Abstract This invention is generally directed to dry negatively charged toner compositions comprised of resin particles, pigment particles and a polyanhydride charge enhancing composition of the formula: <IMAGE> wherein R is an alkyl group containing from about 6 carbon atoms to about 22 carbon atoms, and n is a number ranging from about 5 to about 2,000.
Inventors
- 👤 Chin H. Lu
- 👤 Christopher J. AuClair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:18
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08704; G03G9/08726; G03G9/08731
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
51 words
A dry negatively charged toner composition comprised of resin particles, pigment particles and a polyanhydride charge enhancing composition of the formula: ##STR4## wherein R is an alkyl group containing from about 6 carbon atoms to about 22 carbon atoms, and n is a number ranging from about 5 to about 2,000.
Claim 2
Dependent Claim
51 words
A dry negatively charged toner composition comprised of resin particles, pigment particles and a polyanhydride charge enhancing composition of the formula: ##STR4## wherein R is an alkyl group containing from about 6 carbon atoms to about 22 carbon atoms, and n is a number ranging from about 5 to about 2,000.
Claim 3
Dependent Claim
35 words
A toner composition in accordance with claim 1 wherein R is an alkyl group containing from about 12 carbon atoms to about 18 carbon atoms, and n is a number ranging from 5 to 200.
Claim 4
Dependent Claim
28 words
A toner composition in accordance with claim 1 wherein the polyanhydride composition is present in an amount of from about 0.1 weight percent to about 98 weight percent.
Claim 5
Dependent Claim
28 words
A toner composition in accordance with claim 1 wherein the polyanhydride composition is present in an amount of from about 0.1 weight percent to about 10 weight percent.
Claim 6
Dependent Claim
20 words
A toner composition in accordance with claim 1 wherein the polyanhydride composition is a copolymer of octadecene-1 and maleic anhydride.
Claim 7
Dependent Claim
20 words
A toner composition in accordance with claim 1 wherein the polyanhydride composition is a copolymer of hexadecene-1 and maleic anhydride.
Claim 8
Dependent Claim
20 words
A toner composition in accordance with claim 1 wherein the polyanhydride composition is a copolymer of tetradecene-1 and maleic anhydride.
Claim 9
Dependent Claim
20 words
A toner composition in accordance with claim 1 wherein the polyanhydride composition is a copolymer of dodecene-1 and maleic anhydride.
Claim 10
Dependent Claim
17 words
A toner composition in accordance with claim 1 wherein the resin particles are comprised of styrene/n-butylmethacrylate copolymer.
Claim 11
Dependent Claim
22 words
A toner composition in accordance with claim 1 wherein the pigment particles are carbon black, cyan, magenta, yellow, scarlet, or mixtures thereof.
Claim 12
Dependent Claim
57 words
A developer composition comprised of negatively charged toner particles, comprised of resin particles, pigment particles, and a polyanhydride charge enhancing composition of the formula: ##STR5## wherein R is an alkyl group containing from about 6 carbon atoms to about 22 carbon atoms, and n is a number ranging from about 5 to about 2,000, and carrier particles.
Claim 13
Dependent Claim
57 words
A developer composition comprised of negatively charged toner particles, comprised of resin particles, pigment particles, and a polyanhydride charge enhancing composition of the formula: ##STR5## wherein R is an alkyl group containing from about 6 carbon atoms to about 22 carbon atoms, and n is a number ranging from about 5 to about 2,000, and carrier particles.
Claim 14
Dependent Claim
27 words
A developer composition in accordance with claim 11 wherein the polyanhydride composition is present in an amount of from about 0.1 weight percent to 98 weight percent.
Claim 15
Dependent Claim
33 words
A developer composition in accordance with claim 11 wherein the polyanhydride composition is a copolymer of octadecene-1 and maleic anhydride, hexadecene-1 and maleic anhydride, tetradecene-1 and maleic anhydride, and dodecene-1 and maleic anhydride.
Claim 16
Dependent Claim
19 words
A developer composition in accordance with claim 11 wherein the toner resin particles are comprised of a styrene/n-butylmethacrylate copolymer.
Claim 17
Dependent Claim
31 words
A developer composition in accordance with claim 11 wherein the carrier particles consist of a ferrite core coated with a terpolymer of styrene, methylmethacrylate, and a silane, or with ethyl cellulose.
Claim 18
Dependent Claim
17 words
A developer composition in accordance with claim 11 wherein the pigment particles are comprised of carbon black.
Claim 19
Dependent Claim
28 words
A developer composition in accordance with claim 11 wherein the pigment particles are comprised of a material selected from cyan, magenta, scarlet, and yellow pigments, or mixtures thereof.
Claim 20
Dependent Claim
16 words
A developer composition in accordance with claim 11 wherein the cyan pigment is copper tetra-4(octadecylsulfonamido) phthalocyanine.
Claim 21
Dependent Claim
15 words
A developer composition in accordance with claim 11 wherein the magenta pigment is 2,9-dimethyl quinacridone.
Claim 22
Dependent Claim
15 words
A developer composition in accordance with claim 11 wherein the yellow pigment is 2,5-dimethoxy-4-sulfonoanilide phenylazo-4'-chloro-2,5-dimethoxyaceto-acetanilide.
Claim 23
Independent Claim
88 words
A method for developing electrostatic latent images comprising forming a positive electrostatic latent image on an inorganic photoresponsive device, contacting the resulting image with a toner composition comprised of resin particles, pigment particles and a polyanhydride charge enhancing composition of the formula: ##STR6## wherein R is an alkyl group containing from about 6 carbon atoms to about 22 carbon atoms, and n is a number ranging from about 5 to about 2,000, followed by transferring the image to a suitable substrate, and optionally permanently affixing the image thereto.
Claim 24
Independent Claim
88 words
A method for developing electrostatic latent images comprising forming a positive electrostatic latent image on an inorganic photoresponsive device, contacting the resulting image with a toner composition comprised of resin particles, pigment particles and a polyanhydride charge enhancing composition of the formula: ##STR6## wherein R is an alkyl group containing from about 6 carbon atoms to about 22 carbon atoms, and n is a number ranging from about 5 to about 2,000, followed by transferring the image to a suitable substrate, and optionally permanently affixing the image thereto.
Claim 25
Dependent Claim
28 words
A method in accordance with claim 21 wherein the pigment particles are comprised of cyan, magenta, scarlet, and yellow pigments or mixtures thereof and there results color images.
Claim 26
Dependent Claim
50 words
A method of imaging in accordance with claim 21 wherein the polyanhydride composition is present in an amount of from about 0.1 weight percent to about 98 weight percent, and is a copolymer octadecene-1 and maleic anhydride, hexadecene-1 and maleic anhydride, tetradecene-1 and maleic anhydride, and dodecene-1 and maleic anhydride.
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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) | 1987-04-10 | 1987-10-10 | 1988-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-10 | 1991-10-10 | 1992-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-10 | 1995-10-10 | 1996-04-10 | $7700.00 | Window Closed / Lapsed |