Patent US4263389A successfully refreshed from Google Patents.
US4263389A
Expired / Lapsed
US
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Positively charged toners containing vinyl pyrrolidone polymers
Assignee: Xerox Corp
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Filing: 1979-07-16
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Granted: 1981-04-21
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Expires: 1999-07-16
Abstract
Abstract Disclosed is a positively charged toner composition comprised of a resin, a colorant and polymers of vinyl pyrrolidone of the formula: <IMAGE> wherein x is a number of from about 20 to 1,800 and y is zero, or 1. A developer material is typically formulated by adding a carrier to the toner composition. Images of high quality are obtained when using these developers in an electrophotographic imaging system. The polymers of vinyl pyrrolidone are also useful as dispersants.
Inventors
- 👤 Roger N. Ciccarelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:49
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/0874
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
40 words
A positively charged dry toner composition comprised of a resin, a colorant, a carrier, and polymers of vinyl pyrrolidone of the formula: ##STR3## wherein x is a number of from about 20 to 1,800 and y is zero, or 1.
Claim 2
Dependent Claim
40 words
A positively charged dry toner composition comprised of a resin, a colorant, a carrier, and polymers of vinyl pyrrolidone of the formula: ##STR3## wherein x is a number of from about 20 to 1,800 and y is zero, or 1.
Claim 3
Dependent Claim
27 words
A toner composition in accordance with claim 1 wherein y is zero, and the molecular weight of the polyvinyl pyrrolidone is from about 5,000 to about 300,000.
Claim 4
Dependent Claim
23 words
A toner composition in accordance with claim 1 wherein the polymer is a styrene/butyl methacrylate/vinyl pyrrolidone terpolymer, or a vinyl pyrrolidone/vinyl acetate copolymer.
Claim 5
Dependent Claim
20 words
A toner composition in accordance with claim 1 wherein the resin is styrene/n-butyl methacrylate, and the colorant is carbon black.
Claim 6
Dependent Claim
18 words
A toner in accordance with claim 1 wherein the polymer of vinyl pyrrolidone is coated on the colorant.
Claim 7
Dependent Claim
20 words
A toner in accordance with claim 1 wherein the carrier is steel, or a metal core coated with a fluoropolymer.
Claim 8
Independent Claim
74 words
A method of imaging comprising forming an electrostatic latent image on a photoreceptor which is negatively charged, contacting the image with a positively charged dry developer comprising a resin material, a colorant, a carrier, and polymers of vinyl pyrrolidone of the formula: ##STR4## wherein x is a number of from about 20 to 1,800 and y is zero, or 1, subsequently transfferring the developed image to a substrate and permanently affixing the image thereto.
Claim 9
Independent Claim
74 words
A method of imaging comprising forming an electrostatic latent image on a photoreceptor which is negatively charged, contacting the image with a positively charged dry developer comprising a resin material, a colorant, a carrier, and polymers of vinyl pyrrolidone of the formula: ##STR4## wherein x is a number of from about 20 to 1,800 and y is zero, or 1, subsequently transfferring the developed image to a substrate and permanently affixing the image thereto.
Claim 10
Dependent Claim
28 words
A method of imaging in accordance with claim 7 whereby y is zero, and the molecular weight of the polyvinyl pyrrolidone is from about 5,000 to about 300,000.
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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) | 1984-04-20 | 1984-10-20 | 1985-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-20 | 1988-10-20 | 1989-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-20 | 1992-10-20 | 1993-04-21 | $7700.00 | Window Closed / Lapsed |